{"id":16938,"date":"2026-04-24T08:34:30","date_gmt":"2026-04-24T08:34:30","guid":{"rendered":"https:\/\/www.dgcrane.com\/?post_type=posts&#038;p=16938"},"modified":"2026-04-24T08:35:47","modified_gmt":"2026-04-24T08:35:47","slug":"overhead-and-gantry-cranes-main-girder","status":"publish","type":"posts","link":"https:\/\/www.dgcrane.com\/vi\/posts\/overhead-and-gantry-cranes-main-girder\/","title":{"rendered":"C\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n - D\u1ea7m ch\u00ednh: H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 k\u1ebft c\u1ea5u th\u00e9p"},"content":{"rendered":"<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><p>M\u1ee5c l\u1ee5c<\/p><nav><ul><li><a href=\"#low-carbon-steel-top-choice-for-light-small-overhead-and-gantry-cranes\">Th\u00e9p cacbon th\u1ea5p: L\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho c\u1ea7n c\u1ea9u tr\u1ee5c v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n c\u1ee1 nh\u1ecf v\u00e0 nh\u1eb9.<\/a><ul><li><a href=\"#q-235-b-en-s-235-jr-astm-a-283\">Q235B (EN S235JR\/ASTM A283)<\/a><\/li><li><a href=\"#q-235-c-q-235-d-en-s-235-j-2-astm-a-1011\">Q235C\/Q235D (EN S235J2\/ASTM A1011)<\/a><\/li><\/ul><\/li><li><a href=\"#high-strength-low-alloy-steel-ideal-for-medium-heavy-duty-overhead-and-gantry-cranes\">Th\u00e9p h\u1ee3p kim th\u1ea5p c\u01b0\u1eddng \u0111\u1ed9 cao: L\u00fd t\u01b0\u1edfng cho c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n t\u1ea3i tr\u1ecdng trung b\u00ecnh v\u00e0 n\u1eb7ng.<\/a><ul><li><a href=\"#q-355-b-en-s-355-jr-astm-a-572-gr-50\">Q355B (EN S355JR\/ASTM A572 Gr.50)<\/a><\/li><li><a href=\"#q-390-b-en-s-355-j-2-astm-a-572-gr-60\">Q390B (EN S355J2\/ASTM A572 Gr.60)<\/a><\/li><li><a href=\"#q-420-b-en-s-420-ml-astm-a-572-gr-70\">Q420B (EN S420ML\/ASTM A572 Gr.70)<\/a><\/li><\/ul><\/li><li><a href=\"#special-steel-choice-for-extreme-conditions\">Th\u00e9p \u0111\u1eb7c bi\u1ec7t: L\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n s\u1eed d\u1ee5ng trong \u0111i\u1ec1u ki\u1ec7n kh\u1eafc nghi\u1ec7t.<\/a><ul><li><a href=\"#q-460-ne-ens-460-nl-astm-a-537-cl-2\">Q460NE (ENS460NL\/ASTM A537 Cl.2)<\/a><\/li><li><a href=\"#q-355-nh-en-s-355-j-2-w-astm-a-588\">Q355NH (EN S355J2W\/ASTM A588)<\/a><\/li><li><a href=\"#q-450-nqr-1-en-s-355-k-2-w-astm-a-633-grade-c-d\">Q450NQR1 (EN S355K2W\/ASTM A633 C\u1ea5p C\/D)<\/a><\/li><li><a href=\"#q-690-e-en-s-690-ql-astm-a-514-gr-b\">Q690E (EN S690QL\/ASTM A514 Gr.B)<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1536\" height=\"1024\" src=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Overhead-and-Gantry-Cranes-Main-Girder-The-Ultimate-Steel-Guide.png\" alt=\"\" class=\"wp-image-16939\"><\/figure>\n\n\n\n<p>D\u1ea7m ch\u00ednh, v\u1edbi vai tr\u00f2 l\u00e0 c\u1ea5u tr\u00fac ch\u1ecbu l\u1ef1c ch\u00ednh c\u1ee7a c\u1ea7n c\u1ea9u, th\u01b0\u1eddng chi\u1ebfm m\u1ed9t ph\u1ea7n \u0111\u00e1ng k\u1ec3 tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a n\u00f3. <a href=\"https:\/\/www.dgcrane.com\/vi\/overhead-cranes\/\">C\u1ea7u tr\u1ee5c<\/a> D\u1ea7m ch\u00ednh chi\u1ebfm t\u1eeb 401 t\u1ea5n \u0111\u1ebfn 601 t\u1ea5n tr\u1ecdng l\u01b0\u1ee3ng to\u00e0n b\u1ed9 c\u1ea7n c\u1ea9u, trong khi d\u1ea7m ch\u00ednh c\u1ee7a c\u1ea7n c\u1ea9u gi\u00e0n c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng v\u01b0\u1ee3t qu\u00e1 301 t\u1ea5n. V\u1eadt li\u1ec7u th\u00e9p c\u1ee7a d\u1ea7m ch\u00ednh quy\u1ebft \u0111\u1ecbnh tr\u1ef1c ti\u1ebfp \u0111\u1ebfn kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i t\u1ed5ng th\u1ec3, an to\u00e0n v\u1eadn h\u00e0nh v\u00e0 t\u1ed5ng chi ph\u00ed c\u1ee7a c\u1ea7n c\u1ea9u. D\u1eef li\u1ec7u t\u1eeb Hi\u1ec7p h\u1ed9i C\u00f4ng nghi\u1ec7p M\u00e1y m\u00f3c h\u1ea1ng n\u1eb7ng Trung Qu\u1ed1c cho th\u1ea5y h\u01a1n 651 t\u1ea5n h\u01b0 h\u1ecfng k\u1ebft c\u1ea5u b\u1eaft ngu\u1ed3n t\u1eeb vi\u1ec7c kh\u00f4ng ph\u00f9 h\u1ee3p gi\u1eefa th\u00e9p d\u1ea7m ch\u00ednh v\u00e0 \u0111i\u1ec1u ki\u1ec7n v\u1eadn h\u00e0nh. \u0110\u1ec3 gi\u00fap b\u1ea1n gi\u1ea3m thi\u1ec3u r\u1ee7i ro thi\u1ebft b\u1ecb v\u00e0 t\u1ed1i \u01b0u h\u00f3a to\u00e0n b\u1ed9 quy tr\u00ecnh l\u1ef1a ch\u1ecdn, ch\u00fang t\u00f4i \u0111\u00e3 bi\u00ean so\u1ea1n b\u1ea3ng so s\u00e1nh th\u00f4ng s\u1ed1 cho c\u00e1c v\u1eadt li\u1ec7u th\u00e9p ph\u1ed5 bi\u1ebfn c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n. Ph\u1ea7n ti\u1ebfp theo s\u1ebd ph\u00e2n t\u00edch c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m c\u1ed1t l\u00f5i c\u1ee7a c\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u th\u00e9p kh\u00e1c nhau ph\u00f9 h\u1ee3p cho d\u1ea7m ch\u00ednh.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>V\u1eadt li\u1ec7u th\u00e9p<\/th><th>\u1ee8ng d\u1ee5ng<\/th><th>Trung Qu\u1ed1c (GB\/GB\/T)<\/th><th>Ch\u00e2u \u00c2u (EN10025)<\/th><th>Hoa K\u1ef3 (ASTM\/AISC)<\/th><th>\u0110\u1ed9 b\u1ec1n k\u00e9o (MPa)<\/th><\/tr><\/thead><tbody><tr><td>Th\u00e9p cacbon th\u1ea5p<\/td><td>\u226410 t\u1ea5n, c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n<\/td><td>Q235B\/Q235C\/Q235D<\/td><td>S235JR\/S235J2<\/td><td>A283\/A1011<\/td><td>\u2265235<\/td><\/tr><tr><td rowspan=\"3\">Th\u00e9p h\u1ee3p kim th\u1ea5p c\u01b0\u1eddng \u0111\u1ed9 cao<\/td><td>C\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n, t\u1ea3i tr\u1ecdng t\u1eeb 10t-50t.<\/td><td>Q355B<\/td><td>S355JR<\/td><td>A572 Gr.50<\/td><td>\u2265355<\/td><\/tr><tr><td rowspan=\"2\">C\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n, t\u1ea3i tr\u1ecdng 50t-300t<\/td><td>Q390B<\/td><td>S355J2<\/td><td>A572 Gr.60<\/td><td>\u2265390<\/td><\/tr><tr><td>Q420B<\/td><td>S420ML<\/td><td>A572 Gr.70<\/td><td>\u2265420<\/td><\/tr><tr><td rowspan=\"4\">Th\u00e9p \u1ee9ng d\u1ee5ng \u0111\u1eb7c bi\u1ec7t<\/td><td rowspan=\"3\">khu v\u1ef1c nhi\u1ec7t \u0111\u1ed9 th\u1ea5p, t\u00e1c \u0111\u1ed9ng m\u1ea1nh, kh\u00ed h\u1eadu l\u1ea1nh, c\u1ea3ng bi\u1ec3n<\/td><td>Q460NE<\/td><td>S460NL<\/td><td>A537 Cl.2<\/td><td>\u2265460<\/td><\/tr><tr><td>Q355NH<\/td><td>S355J2W<\/td><td>A633 Nh\u00f3m C\/D<\/td><td>\u2265355<\/td><\/tr><tr><td>Q690E<\/td><td>S690QL<\/td><td>A514 Nh\u00f3m B<\/td><td>\u2265690<\/td><\/tr><tr><td>ch\u1ecbu \u0111\u01b0\u1ee3c th\u1eddi ti\u1ebft, s\u1eed d\u1ee5ng ngo\u00e0i tr\u1eddi, gi\u1ea3m chi ph\u00ed b\u1ea3o tr\u00ec<\/td><td>Q450NQR1<\/td><td>S355K2W<\/td><td>A709 Gr.50W<\/td><td>\u2265450<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">B\u1ea3ng so s\u00e1nh th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a c\u00e1c lo\u1ea1i th\u00e9p th\u00f4ng d\u1ee5ng<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"low-carbon-steel-top-choice-for-light-small-overhead-and-gantry-cranes\">Th\u00e9p cacbon th\u1ea5p: L\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho c\u1ea7n c\u1ea9u tr\u1ee5c v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n c\u1ee1 nh\u1ecf v\u00e0 nh\u1eb9.<\/h2>\n\n\n\n<p>V\u1edbi \u01b0u \u0111i\u1ec3m v\u1ec1 \u0111\u1ed9 d\u1ebbo, kh\u1ea3 n\u0103ng h\u00e0n v\u00e0 chi ph\u00ed, th\u00e9p cacbon th\u1ea5p (v\u00ed d\u1ee5 nh\u01b0 Q235B \/ S235JR \/ A283) l\u00e0 v\u1eadt li\u1ec7u ti\u1ebft ki\u1ec7m chi ph\u00ed ch\u1ee7 \u0111\u1ea1o cho d\u1ea7m ch\u00ednh c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n trong c\u00e1c \u1ee9ng d\u1ee5ng t\u1ea3i nh\u1eb9, c\u1ea5p \u0111\u1ed9 l\u00e0m vi\u1ec7c th\u1ea5p, chi\u1ebfm kho\u1ea3ng 221 t\u1ea5n th\u1ecb tr\u01b0\u1eddng v\u1eadt li\u1ec7u cho c\u1ea7n c\u1ea9u nh\u1ecf t\u1ea3i nh\u1eb9 (\u226420 t\u1ea5n).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"q-235-b-en-s-235-jr-astm-a-283\"><strong>Q235B (EN S235JR\/ASTM A283)<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1584\" height=\"1056\" src=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q235B.jpg\" alt=\"\" class=\"wp-image-16941\" srcset=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q235B.jpg 1584w, https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q235B-1536x1024.jpg 1536w\" sizes=\"(max-width: 1584px) 100vw, 1584px\" \/><\/figure>\n\n\n\n<p>Th\u00e9p Q235B, lo\u1ea1i th\u00e9p cacbon th\u1ea5p ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong thi\u1ebft b\u1ecb n\u00e2ng h\u1ea1, \u0111\u1eb7c bi\u1ec7t \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng trong c\u00e1c c\u1ea7n c\u1ea9u h\u1ea1ng nh\u1eb9, t\u1ea3i tr\u1ecdng th\u1ea5p, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u1ea7n c\u1ea9u 5 t\u1ea5n. <a href=\"https:\/\/www.dgcrane.com\/vi\/double-girder-overhead-crane\/\">c\u1ea7n c\u1ea9u c\u1ea7u tr\u1ee5c d\u1ea7m \u0111\u00f4i<\/a> \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nh\u00e0 kho v\u00e0 \u0111\u01b0\u1eddng d\u00e2y \u0111i\u1ec7n tr\u00ean cao m\u1ed9t d\u1ea7m 3 t\u1ea5n. <a href=\"https:\/\/www.dgcrane.com\/vi\/gantry-cranes\/\">c\u1ea7n tr\u1ee5c c\u1ee7a gi\u00e0n c\u1ea7n c\u1ea9u<\/a> trong c\u00e1c x\u01b0\u1edfng. Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc ch\u00ednh v\u00e0 c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n trong b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc<\/th><th>\u0110i\u1ec3m ch\u1ea5t l\u01b0\u1ee3ng<\/th><th>T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc<\/th><th>Th\u00f4ng s\u1ed1<\/th><\/tr><\/thead><tbody><tr><td>Cacbon (C)<\/td><td>\u22640,2%<\/td><td>\u1ee8ng su\u1ea5t ch\u1ea3y<\/td><td>\u2265235MPa<\/td><\/tr><tr><td>Silicon (Si)<\/td><td>\u22640,35%<\/td><td>\u0110\u1ed9 b\u1ec1n k\u00e9o<\/td><td>370-500MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>0.3%-0.7%<\/td><td>\u0110\u1ed9 b\u1ec1n va \u0111\u1eadp<\/td><td>\u226527 J (Th\u1eed nghi\u1ec7m va \u0111\u1eadp \u1edf 20\u2103)<\/td><\/tr><tr><td>L\u01b0u hu\u1ef3nh (S)<\/td><td>\u22640,045%<\/td><td>\u0110\u1ed9 gi\u00e3n ph\u1ea7n tr\u0103m<\/td><td>\u226521% (\u0111\u1ed9 d\u00e0y \u2264 16mm)<\/td><\/tr><tr><td>Ph\u1ed1t pho (P)<\/td><td>\u22640,045%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>D\u1ef1a tr\u00ean c\u00e1c ch\u1ec9 s\u1ed1 hi\u1ec7u su\u1ea5t n\u00eau tr\u00ean, ch\u00fang ta c\u00f3 th\u1ec3 ph\u00e2n t\u00edch r\u00f5 h\u01a1n nh\u1eefng \u01b0u \u0111i\u1ec3m c\u1ed1t l\u00f5i c\u1ee7a Q235B:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>H\u00e0m l\u01b0\u1ee3ng cacbon th\u1ea5p cao, hi\u1ec7u su\u1ea5t h\u00e0n tuy\u1ec7t v\u1eddi:<\/strong> D\u1ea7m ch\u00ednh c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n c\u00f3 c\u1ea5u tr\u00fac m\u1ed1i h\u00e0n d\u00e0y \u0111\u1eb7c v\u00e0 ph\u1ee9c t\u1ea1p. H\u00e0m l\u01b0\u1ee3ng carbon th\u1ea5p c\u1ee7a th\u00e9p Q235B cho ph\u00e9p \u0111\u1ea1t \u0111\u01b0\u1ee3c ch\u1ea5t l\u01b0\u1ee3ng m\u1ed1i h\u00e0n cao v\u1edbi c\u00e1c quy tr\u00ecnh h\u00e0n th\u00f4ng th\u01b0\u1eddng, gi\u1ea3m thi\u1ec3u kh\u1ea3 n\u0103ng x\u1ea3y ra l\u1ed7i h\u00e0n v\u00e0 \u0111\u1ea3m b\u1ea3o t\u00ednh \u1ed5n \u0111\u1ecbnh s\u1ea3n xu\u1ea5t cao.<\/li>\n\n\n\n<li><strong>\u0110\u1ed9 b\u1ec1n v\u1eeba ph\u1ea3i, ch\u1ecbu \u0111\u01b0\u1ee3c c\u00e1c va \u0111\u1eadp th\u00f4ng th\u01b0\u1eddng:<\/strong> V\u1edbi n\u0103ng l\u01b0\u1ee3ng va \u0111\u1eadp \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng 20\u2103 kh\u00f4ng d\u01b0\u1edbi 27 J, v\u1eadt li\u1ec7u n\u00e0y c\u00f3 \u0111\u1ed9 b\u1ec1n t\u1ed1t. N\u00f3 h\u1ea5p th\u1ee5 c\u00e1c c\u00fa s\u1ed1c v\u00e0 rung \u0111\u1ed9ng trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n, ch\u1ed1ng l\u1ea1i s\u1ef1 g\u00e3y gi\u00f2n do thay \u0111\u1ed5i t\u1ea3i tr\u1ecdng \u0111\u1ed9t ng\u1ed9t v\u00e0 mang l\u1ea1i hi\u1ec7u su\u1ea5t k\u1ebft c\u1ea5u an to\u00e0n h\u01a1n, \u0111\u00e1ng tin c\u1eady h\u01a1n.<\/li>\n\n\n\n<li><strong>Chi ph\u00ed th\u1ea5p, hi\u1ec7u qu\u1ea3 kinh t\u1ebf tuy\u1ec7t v\u1eddi:<\/strong> Th\u00e9p Q235B c\u00f3 chi ph\u00ed s\u1ea3n xu\u1ea5t t\u01b0\u01a1ng \u0111\u1ed1i th\u1ea5p. H\u01a1n n\u1eefa, hi\u1ec7u n\u0103ng to\u00e0n di\u1ec7n c\u1ee7a n\u00f3 \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u \u1ee9ng d\u1ee5ng c\u1ee7a h\u1ea7u h\u1ebft c\u00e1c k\u1ebft c\u1ea5u th\u00e9p c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n, gi\u00fap gi\u1ea3m chi ph\u00ed s\u1ea3n xu\u1ea5t hi\u1ec7u qu\u1ea3 \u0111\u1ed3ng th\u1eddi \u0111\u1ea3m b\u1ea3o an to\u00e0n v\u00e0 \u0111\u1ed9 tin c\u1eady, mang l\u1ea1i hi\u1ec7u qu\u1ea3 kinh t\u1ebf cao.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Tuy nhi\u00ean, do nh\u1eefng h\u1ea1n ch\u1ebf v\u1ec1 c\u1ea5p \u0111\u1ed9 b\u1ec1n v\u00e0 \u0111\u1eb7c t\u00ednh hi\u1ec7u n\u0103ng c\u1ee7a b\u1ea3n th\u00e2n v\u1eadt li\u1ec7u, Q235B c\u0169ng c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf nh\u1ea5t \u0111\u1ecbnh; do \u0111\u00f3:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u0110\u1ed9 b\u1ec1n k\u00e9o th\u1ea5p: <\/strong>Th\u00e9p Q235B ch\u1ec9 c\u00f3 gi\u1edbi h\u1ea1n ch\u1ea3y l\u00e0 235MPa. Trong \u0111i\u1ec1u ki\u1ec7n t\u1ea3i tr\u1ecdng n\u1eb7ng, \u0111\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 b\u1ec1n c\u1ea7n ph\u1ea3i s\u1eed d\u1ee5ng c\u00e1c t\u1ea5m th\u00e9p d\u00e0y h\u01a1n, l\u00e0m t\u0103ng \u0111\u00e1ng k\u1ec3 tr\u1ecdng l\u01b0\u1ee3ng k\u1ebft c\u1ea5u, \u0111i\u1ec1u n\u00e0y kh\u00f4ng ph\u00f9 h\u1ee3p cho vi\u1ec7c s\u1eed d\u1ee5ng trong \u0111i\u1ec1u ki\u1ec7n t\u1ea3i n\u1eb7ng v\u00e0 t\u1ea7n su\u1ea5t cao.<\/li>\n\n\n\n<li><strong>Kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n k\u00e9m:<\/strong> Do k\u1ebft c\u1ea5u th\u00e9p c\u1ee7a c\u1ea7n c\u1ea9u th\u01b0\u1eddng xuy\u00ean ti\u1ebfp x\u00fac v\u1edbi c\u00e1c y\u1ebfu t\u1ed1 m\u00f4i tr\u01b0\u1eddng trong th\u1eddi gian d\u00e0i, th\u00e9p Q235B d\u1ec5 b\u1ecb \u0103n m\u00f2n, c\u1ea7n ph\u1ea3i ph\u1ee7 l\u1edbp ch\u1ed1ng \u0103n m\u00f2n v\u00e0 kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi m\u00f4i tr\u01b0\u1eddng c\u00f3 t\u00ednh \u0103n m\u00f2n cao.<\/li>\n\n\n\n<li><strong>Kh\u00f4ng th\u00edch h\u1ee3p cho m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p: <\/strong>Th\u00e9p Q235B ch\u1ec9 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 b\u1ec1n va \u0111\u1eadp \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng. N\u00f3 d\u1ec5 b\u1ecb g\u00e3y gi\u00f2n \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p. Do \u0111\u00f3, vi\u1ec7c s\u1eed d\u1ee5ng tr\u1ef1c ti\u1ebfp trong m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p ti\u1ec1m \u1ea9n nguy c\u01a1 g\u00e3y gi\u00f2n, \u0111\u00f2i h\u1ecfi ph\u1ea3i s\u1eed d\u1ee5ng th\u00e9p ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 th\u1ea5p ho\u1eb7c th\u00e9p c\u1ea5p Q355D\/E.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"q-235-c-q-235-d-en-s-235-j-2-astm-a-1011\"><strong>Q235C\/Q235D (EN S235J2\/ASTM A1011)<\/strong><\/h3>\n\n\n\n<p>Q235C v\u00e0 Q235D l\u00e0 c\u00e1c bi\u1ebfn th\u1ec3 n\u00e2ng c\u1ea5p ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 th\u1ea5p c\u1ee7a Q235B. Ch\u00fang c\u00f3 \u0111\u1ed9 d\u1ebbo dai \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p \u1ed5n \u0111\u1ecbnh h\u01a1n, \u00edt t\u1ea1p ch\u1ea5t h\u01a1n v\u00e0 \u00edt b\u1ecb gi\u00f2n h\u01a1n v\u00e0o m\u00f9a \u0111\u00f4ng, do \u0111\u00f3 ph\u00f9 h\u1ee3p v\u1edbi c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n c\u00f3 y\u00eau c\u1ea7u cao h\u01a1n v\u1ec1 an to\u00e0n, kh\u1ea3 n\u0103ng ch\u1ed1ng va \u0111\u1eadp v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p.&nbsp;<\/p>\n\n\n\n<p>Th\u00e9p Q235C y\u00eau c\u1ea7u n\u0103ng l\u01b0\u1ee3ng va \u0111\u1eadp \u2265 27 J \u1edf 0\u2103, nh\u01b0ng \u0111\u1ed9 d\u1ebbo dai c\u1ee7a n\u00f3 gi\u1ea3m \u0111\u00e1ng k\u1ec3 d\u01b0\u1edbi -10\u2103. Th\u00e9p Q235D y\u00eau c\u1ea7u n\u0103ng l\u01b0\u1ee3ng va \u0111\u1eadp \u2265 27 J \u1edf -20\u2103, c\u00f3 th\u1ec3 ng\u0103n ng\u1eeba hi\u1ec7u qu\u1ea3 hi\u1ec7n t\u01b0\u1ee3ng g\u00e3y gi\u00f2n \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh ngo\u00e0i tr\u1eddi l\u00e2u d\u00e0i v\u00e0o m\u00f9a \u0111\u00f4ng v\u00e0 mang l\u1ea1i m\u1ee9c \u0111\u1ed9 an to\u00e0n cao nh\u1ea5t, nh\u01b0ng \u0111i k\u00e8m v\u1edbi chi ph\u00ed s\u1ea3n xu\u1ea5t v\u00e0 gi\u00e1 th\u00e0nh cao h\u01a1n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"high-strength-low-alloy-steel-ideal-for-medium-heavy-duty-overhead-and-gantry-cranes\">Th\u00e9p h\u1ee3p kim th\u1ea5p c\u01b0\u1eddng \u0111\u1ed9 cao: L\u00fd t\u01b0\u1edfng cho c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n t\u1ea3i tr\u1ecdng trung b\u00ecnh v\u00e0 n\u1eb7ng.<\/h2>\n\n\n\n<p>Th\u00e9p h\u1ee3p kim th\u1ea5p c\u01b0\u1eddng \u0111\u1ed9 cao (HSLA) \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t b\u1eb1ng c\u00e1ch th\u00eam m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim nh\u01b0 V, Nb v\u00e0 Ti v\u00e0o th\u00e9p k\u1ebft c\u1ea5u cacbon. N\u00f3 c\u00e2n b\u1eb1ng gi\u1eefa \u0111\u1ed9 b\u1ec1n v\u00e0 kh\u1ea3 n\u0103ng gia c\u00f4ng v\u00e0 hi\u1ec7n l\u00e0 &quot;v\u1eadt li\u1ec7u ch\u1ee7 \u0111\u1ea1o&quot; cho d\u1ea7m ch\u00ednh c\u1ee7a c\u1ea7n c\u1ea9u. N\u00f3 chi\u1ebfm h\u01a1n 581 t\u1ea5n\/t\u1ea5n th\u1ecb tr\u01b0\u1eddng v\u1eadt li\u1ec7u d\u1ea7m ch\u00ednh v\u00e0 d\u1ea7m cu\u1ed1i c\u1ea7n c\u1ea9u trong n\u01b0\u1edbc v\u00e0 l\u00e0 l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho h\u01a1n 801 t\u1ea5n\/t\u1ea5n c\u1ea7n c\u1ea9u \u0111a d\u1ee5ng. N\u00f3 ph\u00f9 h\u1ee3p v\u1edbi h\u1ea7u h\u1ebft c\u00e1c tr\u01b0\u1eddng h\u1ee3p t\u1ea3i tr\u1ecdng trung b\u00ecnh v\u00e0 n\u1eb7ng, \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c nhu c\u1ea7u s\u1eed d\u1ee5ng v\u00e0 ki\u1ec3m so\u00e1t chi ph\u00ed, tr\u1edf th\u00e0nh &quot;l\u1ef1a ch\u1ecdn an to\u00e0n&quot; cho ng\u01b0\u1eddi mua.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"q-355-b-en-s-355-jr-astm-a-572-gr-50\"><strong>Q355B (EN S355JR\/ASTM A572 Gr.50)<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1152\" height=\"768\" src=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q355B.jpg\" alt=\"\" class=\"wp-image-16942\"><\/figure>\n\n\n\n<p>Th\u00e9p Q355B, m\u1ed9t lo\u1ea1i th\u00e9p h\u1ee3p kim th\u1ea5p c\u01b0\u1eddng \u0111\u1ed9 cao \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i, l\u00e0 &quot;v\u1eadt li\u1ec7u ch\u1ee7 l\u1ef1c&quot; trong ng\u00e0nh v\u00e0 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c lo\u1ea1i c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n c\u00f3 t\u1ea3i tr\u1ecdng trung b\u00ecnh \u0111\u1ebfn nh\u1eb9 v\u1edbi c\u1ea5p l\u00e0m vi\u1ec7c A3-A5. C\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i c\u1ee7a n\u00f3 nh\u01b0 sau:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc <\/th><th>\u0110i\u1ec3m ch\u1ea5t l\u01b0\u1ee3ng<\/th><th>T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc<\/th><th>Th\u00f4ng s\u1ed1<\/th><\/tr><\/thead><tbody><tr><td>Cacbon (C)<\/td><td>\u22640,24%<\/td><td>\u1ee8ng su\u1ea5t ch\u1ea3y<\/td><td>\u2265355MPa<\/td><\/tr><tr><td>Silicon (Si)<\/td><td>\u22640,55%<\/td><td>\u0110\u1ed9 b\u1ec1n k\u00e9o<\/td><td>470-630MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>\u22641.6%<\/td><td>\u0110\u1ed9 b\u1ec1n va \u0111\u1eadp<\/td><td>\u226534 J (Th\u1eed nghi\u1ec7m va \u0111\u1eadp \u1edf 20\u2103)<\/td><\/tr><tr><td>L\u01b0u hu\u1ef3nh (S)<\/td><td>\u22640,03%<\/td><td>\u0110\u1ed9 gi\u00e3n ph\u1ea7n tr\u0103m<\/td><td>\u226521% (\u0111\u1ed9 d\u00e0y \u2264 16mm)<\/td><\/tr><tr><td>Ph\u1ed1t pho (P)<\/td><td>\u22640,035%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>C\u00e1c th\u00f4ng s\u1ed1 c\u1ed1t l\u00f5i n\u00e0y ch\u00ednh l\u00e0 nh\u1eefng y\u1ebfu t\u1ed1 then ch\u1ed1t gi\u00fap Q355B tr\u1edf th\u00e0nh v\u1eadt li\u1ec7u ch\u00ednh cho c\u1ea7n c\u1ea9u, c\u1ee5 th\u1ec3 th\u1ec3 hi\u1ec7n \u1edf nh\u1eefng \u01b0u \u0111i\u1ec3m sau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>T\u1ef7 l\u1ec7 \u0111\u1ed9 b\u1ec1n k\u00e9o cao, thi\u1ebft k\u1ebf tr\u1ecdng l\u01b0\u1ee3ng nh\u1eb9: <\/strong>Khi \u0111\u1ed9 d\u00e0y t\u1ea5m th\u00e9p l\u1edbn h\u01a1n 16mm, gi\u1edbi h\u1ea1n ch\u1ea3y c\u1ee7a th\u00e9p Q355B cao h\u01a1n kho\u1ea3ng 51% so v\u1edbi th\u00e9p Q235B, d\u1eabn \u0111\u1ebfn gi\u1ea3m tr\u1ecdng l\u01b0\u1ee3ng t\u1eeb 15% \u0111\u1ebfn 25% d\u01b0\u1edbi c\u00f9ng kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3m c\u1ea3 tr\u1ecdng l\u01b0\u1ee3ng b\u1ea3n th\u00e2n c\u1ea7n c\u1ea9u v\u00e0 \u00e1p l\u1ef1c ch\u1ecbu t\u1ea3i l\u00ean nh\u00e0 m\u00e1y.<\/li>\n\n\n\n<li><strong>H\u00e0m l\u01b0\u1ee3ng carbon t\u01b0\u01a1ng \u0111\u01b0\u01a1ng th\u1ea5p, kh\u1ea3 n\u0103ng h\u00e0n t\u1ed1t h\u01a1n:<\/strong> Nguy c\u01a1 n\u1ee9t ngu\u1ed9i trong qu\u00e1 tr\u00ecnh h\u00e0n th\u1ea5p. Khi \u0111\u1ed9 d\u00e0y c\u1ee7a th\u00e9p Q355B \u2264 16mm, th\u01b0\u1eddng kh\u00f4ng c\u1ea7n gia nhi\u1ec7t tr\u01b0\u1edbc, cho ph\u00e9p h\u00e0n tr\u1ef1c ti\u1ebfp. \u0110i\u1ec1u n\u00e0y r\u00fat ng\u1eafn chu k\u1ef3 s\u1ea3n xu\u1ea5t v\u00e0 n\u00e2ng cao hi\u1ec7u qu\u1ea3 s\u1ea3n xu\u1ea5t.<\/li>\n\n\n\n<li><strong>\u0110\u1ed9 b\u1ec1n v\u01b0\u1ee3t tr\u1ed9i \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p:<\/strong> Th\u00e9p Q355B c\u00f3 kh\u1ea3 n\u0103ng th\u00edch \u1ee9ng v\u1edbi nhi\u1ec7t \u0111\u1ed9 th\u1ea5p t\u1ed1t h\u01a1n, v\u01b0\u1ee3t qua c\u00e1c b\u00e0i ki\u1ec3m tra va \u0111\u1eadp \u1edf -20\u2103. N\u00f3 ph\u00f9 h\u1ee3p cho c\u00e1c v\u00f9ng l\u1ea1nh ho\u1eb7c c\u00e1c c\u00f4ng tr\u00ecnh y\u00eau c\u1ea7u \u0111\u1ed9 d\u1ebbo dai cao, gi\u00fap ng\u0103n ng\u1eeba hi\u1ec7u qu\u1ea3 hi\u1ec7n t\u01b0\u1ee3ng n\u1ee9t v\u1ee1 gi\u00f2n trong m\u00f4i tr\u01b0\u1eddng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>M\u1eb7c d\u00f9 th\u00e9p Q355B mang l\u1ea1i hi\u1ec7u su\u1ea5t t\u1ed5ng th\u1ec3 tuy\u1ec7t v\u1eddi, nh\u01b0ng n\u00f3 v\u1eabn c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf \u0111\u00e1ng ch\u00fa \u00fd, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 th\u1ea5p v\u00e0 \u0103n m\u00f2n, c\u0169ng nh\u01b0 v\u1ec1 kh\u1ea3 n\u0103ng h\u00e0n t\u1ea5m d\u00e0y, chi ph\u00ed v\u00e0 \u0111\u1ed9 kh\u00f3 gia c\u00f4ng. Nh\u1eefng nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee5 th\u1ec3 nh\u01b0 sau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Hi\u1ec7u n\u0103ng h\u1ea1n ch\u1ebf \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p:<\/strong> Th\u00e9p Q355B ch\u1ec9 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 b\u1ec1n va \u0111\u1eadp \u0111\u1ea1t ti\u00eau chu\u1ea9n \u1edf 20 \u2103. \u0110\u1ed9 b\u1ec1n c\u1ee7a n\u00f3 gi\u1ea3m m\u1ea1nh d\u01b0\u1edbi 0 \u2103, d\u1eabn \u0111\u1ebfn nguy c\u01a1 gi\u00f2n do l\u1ea1nh cao khi s\u1eed d\u1ee5ng trong kho l\u1ea1nh ho\u1eb7c khu v\u1ef1c ngo\u00e0i tr\u1eddi c\u00f3 nhi\u1ec7t \u0111\u1ed9 c\u1ef1c th\u1ea5p. Do \u0111\u00f3, n\u00f3 kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u00f4i tr\u01b0\u1eddng l\u1ea1nh kh\u1eafc nghi\u1ec7t.<\/li>\n\n\n\n<li><strong>H\u00e0n t\u1ea5m kim lo\u1ea1i d\u00e0y g\u1eb7p nhi\u1ec1u kh\u00f3 kh\u0103n:<\/strong> Khi \u0111\u1ed9 d\u00e0y c\u1ee7a th\u00e9p Q355B v\u01b0\u1ee3t qu\u00e1 25 mm, h\u00e0m l\u01b0\u1ee3ng cacbon t\u01b0\u01a1ng \u0111\u01b0\u01a1ng t\u0103ng l\u00ean \u0111\u00e1ng k\u1ec3, l\u00e0m t\u0103ng nguy c\u01a1 n\u1ee9t m\u1ed1i h\u00e0n. Vi\u1ec7c gia nhi\u1ec7t tr\u01b0\u1edbc v\u00e0 ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 nghi\u00eam ng\u1eb7t trong qu\u00e1 tr\u00ecnh h\u00e0n l\u00e0 c\u1ea7n thi\u1ebft, d\u1eabn \u0111\u1ebfn quy tr\u00ecnh gia c\u00f4ng ph\u1ee9c t\u1ea1p h\u01a1n.<\/li>\n\n\n\n<li><strong>Chi ph\u00ed cao h\u01a1n so v\u1edbi Q235B:<\/strong> Th\u00e9p Q355B th\u01b0\u1eddng \u0111\u1eaft h\u01a1n th\u00e9p Q235B t\u1eeb 10% \u0111\u1ebfn 15%. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng t\u1ea3i nh\u1eb9 ho\u1eb7c c\u00e1c b\u1ed9 ph\u1eadn kh\u00f4ng ch\u1ecbu t\u1ea3i, vi\u1ec7c s\u1eed d\u1ee5ng th\u00e9p Q355B s\u1ebd mang l\u1ea1i hi\u1ec7u su\u1ea5t v\u01b0\u1ee3t tr\u1ed9i m\u00e0 kh\u00f4ng c\u00f3 l\u1ee3i th\u1ebf v\u1ec1 chi ph\u00ed.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"q-390-b-en-s-355-j-2-astm-a-572-gr-60\"><strong>Q390B (EN S355J2\/ASTM A572 Gr.60<\/strong>)<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1248\" height=\"832\" src=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q390B.jpg\" alt=\"\" class=\"wp-image-16944\"><\/figure>\n\n\n\n<p>V\u1edbi gi\u1edbi h\u1ea1n ch\u1ea3y tr\u00ean 390 MPa, th\u00e9p Q390B mang l\u1ea1i kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i v\u00e0 \u0111\u1ed9 an to\u00e0n k\u1ebft c\u1ea5u v\u01b0\u1ee3t tr\u1ed9i. Trong c\u00f9ng \u0111i\u1ec1u ki\u1ec7n t\u1ea3i tr\u1ecdng, n\u00f3 gi\u00fap gi\u1ea3m l\u01b0\u1ee3ng th\u00e9p ti\u00eau th\u1ee5 kho\u1ea3ng 151 t\u1ea5n so v\u1edbi th\u00e9p Q355B, do \u0111\u00f3 \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n y\u00eau c\u1ea7u \u0111\u1ed9 b\u1ec1n cao.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc <\/th><th>\u0110i\u1ec3m ch\u1ea5t l\u01b0\u1ee3ng<\/th><th>T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc<\/th><th>Th\u00f4ng s\u1ed1<\/th><\/tr><\/thead><tbody><tr><td>Cacbon (C)<\/td><td>\u22640,2%<\/td><td>\u1ee8ng su\u1ea5t ch\u1ea3y<\/td><td>\u2265390MPa<\/td><\/tr><tr><td>Silicon (Si)<\/td><td>\u22640,5%<\/td><td>\u0110\u1ed9 b\u1ec1n k\u00e9o<\/td><td>490-650MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>\u22641.7%<\/td><td>\u0110\u1ed9 b\u1ec1n va \u0111\u1eadp<\/td><td>\u226534 J (Th\u1eed nghi\u1ec7m va \u0111\u1eadp \u1edf 20\u2103)<\/td><\/tr><tr><td>L\u01b0u hu\u1ef3nh (S)<\/td><td>\u22640,035%<\/td><td>\u0110\u1ed9 gi\u00e3n ph\u1ea7n tr\u0103m<\/td><td>\u226520% (\u0111\u1ed9 d\u00e0y \u2264 16mm)<\/td><\/tr><tr><td>Ph\u1ed1t pho (P)<\/td><td>\u22640,035%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Do h\u00e0m l\u01b0\u1ee3ng cacbon th\u1ea5p, th\u00e9p Q390B kh\u00f4ng th\u00edch h\u1ee3p cho qu\u00e1 tr\u00ecnh t\u00f4i v\u00e0 ram. Tuy nhi\u00ean, n\u00f3 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n tuy\u1ec7t v\u1eddi v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u1eeba ph\u1ea3i, c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c s\u1ef1 \u0103n m\u00f2n t\u1eeb \u0111i\u1ec1u ki\u1ec7n kh\u00ed quy\u1ec3n v\u00e0 m\u1ed9t s\u1ed1 m\u00f4i tr\u01b0\u1eddng h\u00f3a h\u1ecdc nh\u1ea5t \u0111\u1ecbnh.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"q-420-b-en-s-420-ml-astm-a-572-gr-70\"><strong>Q420B (EN S420ML\/ASTM A572 Gr.70<\/strong>)<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1728\" height=\"1152\" src=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q420B.jpg\" alt=\"\" class=\"wp-image-16945\" srcset=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q420B.jpg 1728w, https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q420B-1536x1024.jpg 1536w\" sizes=\"(max-width: 1728px) 100vw, 1728px\" \/><\/figure>\n\n\n\n<p>Th\u00e9p Q420B l\u00e0 lo\u1ea1i th\u00e9p si\u00eau b\u1ec1n. Theo... <em>Ph\u00e2n t\u00edch hi\u1ec7n tr\u1ea1ng ph\u00e1t tri\u1ec3n v\u00e0 nhu c\u1ea7u th\u00e9p c\u1ee7a ng\u00e0nh k\u1ebft c\u1ea5u th\u00e9p Trung Qu\u1ed1c<\/em>Th\u00e9p c\u01b0\u1eddng \u0111\u1ed9 cao Q420B chi\u1ebfm h\u01a1n 501 t\u1ea5n v\u00e0 ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong k\u1ebft c\u1ea5u th\u00e9p x\u00e2y d\u1ef1ng, c\u1ea7u \u0111\u01b0\u1eddng ho\u1eb7c thi\u1ebft b\u1ecb h\u1ea1ng n\u1eb7ng, ch\u1eb3ng h\u1ea1n nh\u01b0 d\u1ea7m ch\u00ednh c\u1ee7a c\u1ea7n c\u1ea9u gi\u00e0n 50-300 t\u1ea5n ho\u1eb7c m\u00e1y m\u00f3c c\u1ea3ng.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc <\/th><th>\u0110i\u1ec3m ch\u1ea5t l\u01b0\u1ee3ng<\/th><th>T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc<\/th><th>Th\u00f4ng s\u1ed1<\/th><\/tr><\/thead><tbody><tr><td>Cacbon (C)<\/td><td>\u22640,2%<\/td><td>\u1ee8ng su\u1ea5t ch\u1ea3y<\/td><td>\u2265420MPa<\/td><\/tr><tr><td>Silicon (Si)<\/td><td>\u22640,55%<\/td><td>\u0110\u1ed9 b\u1ec1n k\u00e9o<\/td><td>520-680MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>\u22641.7%<\/td><td>\u0110\u1ed9 b\u1ec1n va \u0111\u1eadp<\/td><td>\u226534 J (Th\u1eed nghi\u1ec7m va \u0111\u1eadp \u1edf 20\u2103)<\/td><\/tr><tr><td>L\u01b0u hu\u1ef3nh (S)<\/td><td>\u22640,035%<\/td><td>\u0110\u1ed9 gi\u00e3n ph\u1ea7n tr\u0103m<\/td><td>\u226518% (\u0111\u1ed9 d\u00e0y \u2264 16mm)<\/td><\/tr><tr><td>Ph\u1ed1t pho (P)<\/td><td>\u22640,035%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Tuy nhi\u00ean, n\u1ebfu \u0111\u1ed9 d\u00e0y c\u1ee7a t\u1ea5m th\u00e9p Q420B t\u0103ng l\u00ean, gi\u1edbi h\u1ea1n ch\u1ea3y c\u1ee7a n\u00f3 s\u1ebd gi\u1ea3m d\u1ea7n theo t\u1eebng b\u01b0\u1edbc. V\u00ed d\u1ee5, khi \u0111\u1ed9 d\u00e0y \u226416mm, gi\u1edbi h\u1ea1n ch\u1ea3y \u0111\u1ea1t \u2265420MPa, nh\u01b0ng khi \u0111\u1ed9 d\u00e0y &gt;50mm, gi\u1edbi h\u1ea1n ch\u1ea3y ch\u1ec9 \u0111\u1ea1t \u2265360MPa. Do \u0111\u00f3, trong c\u00e1c \u1ee9ng d\u1ee5ng t\u1ea5m si\u00eau d\u00e0y, c\u1ea7n ph\u1ea3i t\u1ed1i \u01b0u h\u00f3a quy tr\u00ecnh ho\u1eb7c l\u1ef1a ch\u1ecdn th\u00e9p ch\u1ea5t l\u01b0\u1ee3ng cao h\u01a1n \u0111\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 b\u1ec1n, v\u00e0 chi ph\u00ed s\u1ebd t\u0103ng l\u00ean t\u01b0\u01a1ng \u1ee9ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"special-steel-choice-for-extreme-conditions\">Th\u00e9p \u0111\u1eb7c bi\u1ec7t: L\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n s\u1eed d\u1ee5ng trong \u0111i\u1ec1u ki\u1ec7n kh\u1eafc nghi\u1ec7t.<\/h2>\n\n\n\n<p>Th\u00e9p \u0111\u1eb7c bi\u1ec7t l\u00e0 v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c ch\u1ebf t\u1ea1o ri\u00eang cho d\u1ea7m ch\u00ednh c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao v\u00e0 c\u1ea7n c\u1ea9u gi\u00e0n trong \u0111i\u1ec1u ki\u1ec7n l\u00e0m vi\u1ec7c kh\u1eafc nghi\u1ec7t. N\u00f3 kh\u00e1c v\u1edbi th\u00e9p cacbon th\u1ea5p v\u00e0 th\u00e9p h\u1ee3p kim th\u1ea5p c\u01b0\u1eddng \u0111\u1ed9 cao. Th\u00f4ng qua t\u1ef7 l\u1ec7 h\u1ee3p kim ch\u00ednh x\u00e1c v\u00e0 t\u1ed1i \u01b0u h\u00f3a quy tr\u00ecnh, n\u00f3 kh\u1eafc ph\u1ee5c \u0111\u01b0\u1ee3c nh\u1eefng nh\u01b0\u1ee3c \u0111i\u1ec3m v\u1ec1 hi\u1ec7u su\u1ea5t c\u1ee7a th\u00e9p th\u00f4ng th\u01b0\u1eddng trong c\u00e1c tr\u01b0\u1eddng h\u1ee3p nh\u01b0 c\u1ef1c l\u1ea1nh, phun mu\u1ed1i c\u01b0\u1eddng \u0111\u1ed9 cao, \u0103n m\u00f2n m\u1ea1nh, t\u1ea3i tr\u1ecdng c\u1ef1c l\u1edbn v\u00e0 v\u1eadn h\u00e0nh li\u00ean t\u1ee5c t\u1ea7n su\u1ea5t cao, tr\u1edf th\u00e0nh tr\u1ee5 c\u1ed9t h\u1ed7 tr\u1ee3 an to\u00e0n thi\u1ebft b\u1ecb v\u00e0 ho\u1ea1t \u0111\u1ed9ng l\u00e2u d\u00e0i trong m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"q-460-ne-ens-460-nl-astm-a-537-cl-2\"><strong>Q460NE (ENS460NL\/ASTM A537 Cl.2)<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q460NE.jpg\" alt=\"\" class=\"wp-image-16946\"><\/figure>\n\n\n\n<p>Th\u00e9p Q460NE l\u00e0 lo\u1ea1i th\u00e9p h\u1ee3p kim th\u1ea5p ch\u1ed1ng \u0103n m\u00f2n, \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t cho c\u00e1c \u0111i\u1ec1u ki\u1ec7n l\u00e0m vi\u1ec7c kh\u1eafc nghi\u1ec7t. Ch\u1eef \u201cN\u201d trong m\u00e1c th\u00e9p bi\u1ec3u th\u1ecb kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu th\u1eddi ti\u1ebft, trong khi ch\u1eef \u201cE\u201d t\u01b0\u01a1ng \u1ee9ng v\u1edbi kh\u1ea3 n\u0103ng ch\u1ecbu va \u0111\u1eadp \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p -40\u00b0C. So v\u1edbi th\u00e9p th\u00f4ng th\u01b0\u1eddng, n\u00f3 \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 b\u1ec1n c\u1ee7a c\u00e1c k\u1ebft c\u1ea5u ch\u1ecbu t\u1ea3i n\u1eb7ng v\u00e0 c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh trong th\u1eddi gian d\u00e0i trong m\u00f4i tr\u01b0\u1eddng c\u1ef1c l\u1ea1nh, \u0111\u1ed9 \u1ea9m cao v\u00e0 phun mu\u1ed1i. C\u00e1c th\u00f4ng s\u1ed1 hi\u1ec7u su\u1ea5t ch\u00ednh c\u1ee7a n\u00f3 nh\u01b0 sau:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc <\/th><th>\u0110i\u1ec3m ch\u1ea5t l\u01b0\u1ee3ng<\/th><th>T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc<\/th><th>Th\u00f4ng s\u1ed1<\/th><\/tr><\/thead><tbody><tr><td>Cacbon (C)<\/td><td>\u22640,18%<\/td><td>\u1ee8ng su\u1ea5t ch\u1ea3y<\/td><td>\u2265460MPa<\/td><\/tr><tr><td>Silicon (Si)<\/td><td>\u22640,55%<\/td><td>\u0110\u1ed9 b\u1ec1n k\u00e9o<\/td><td>540-720MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>1.0%-1.6%<\/td><td>\u0110\u1ed9 b\u1ec1n va \u0111\u1eadp<\/td><td>\u226520 J (Th\u1eed nghi\u1ec7m va \u0111\u1eadp \u1edf -40\u2103)<\/td><\/tr><tr><td>L\u01b0u hu\u1ef3nh (S)<\/td><td>\u22640,02%<\/td><td>\u0110\u1ed9 gi\u00e3n ph\u1ea7n tr\u0103m<\/td><td>\u226517% (\u0111\u1ed9 d\u00e0y \u2264 16mm)<\/td><\/tr><tr><td>Ph\u1ed1t pho (P)<\/td><td>\u22640,025%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u0110\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 c\u1ea3i thi\u1ec7n k\u00e9p v\u1ec1 kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu th\u1eddi ti\u1ebft v\u00e0 hi\u1ec7u su\u1ea5t \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p, c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim \u0111\u1eb7c bi\u1ec7t \u0111\u01b0\u1ee3c th\u00eam v\u00e0o c\u00f4ng th\u1ee9c Q460NE. H\u00e0m l\u01b0\u1ee3ng v\u00e0 ch\u1ee9c n\u0103ng c\u1ee7a m\u1ed7i nguy\u00ean t\u1ed1 nh\u01b0 sau:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>C\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim<\/th><th>Gi\u1edbi h\u1ea1n tr\u00ean c\u1ee7a n\u1ed9i dung<\/th><th>Ch\u1ee9c n\u0103ng ch\u00ednh<\/th><\/tr><\/thead><tbody><tr><td>Crom (Cr)<\/td><td>\u22640,30%<\/td><td>C\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 t\u0103ng c\u01b0\u1eddng t\u00ednh \u1ed5n \u0111\u1ecbnh c\u1ee7a m\u00f4.<\/td><\/tr><tr><td>Niken (Ni)<\/td><td>\u22640,80%<\/td><td>C\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 d\u1ebbo dai \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p v\u00e0 gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 chuy\u1ec3n ti\u1ebfp t\u1eeb tr\u1ea1ng th\u00e1i d\u1ebbo sang tr\u1ea1ng th\u00e1i gi\u00f2n.<\/td><\/tr><tr><td>\u0110\u1ed3ng (Cu)<\/td><td>\u22640,40%<\/td><td>C\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n kh\u00ed quy\u1ec3n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>T\u00f3m l\u1ea1i, nh\u1edd thi\u1ebft k\u1ebf \u00edt carbon v\u00e0 hi\u1ec7u \u1ee9ng hi\u1ec7p \u0111\u1ed3ng c\u1ee7a c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim nh\u01b0 Cr, Ni v\u00e0 Cu, Q460NE c\u00f3 th\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u v\u1ec1 c\u01a1 h\u1ecdc v\u00e0 \u0111\u1ed9 b\u1ec1n trong m\u00f4i tr\u01b0\u1eddng c\u00f3 \u0111\u1ed9 \u1ea9m v\u00e0 h\u00e0m l\u01b0\u1ee3ng mu\u1ed1i cao. Ngay c\u1ea3 \u1edf nhi\u1ec7t \u0111\u1ed9 c\u1ef1c th\u1ea5p -40\u2103, Q460NE v\u1eabn duy tr\u00ec \u0111\u1ed9 d\u1ebbo dai va \u0111\u1eadp t\u1ed1t, ng\u0103n ng\u1eeba hi\u1ec7u qu\u1ea3 hi\u1ec7n t\u01b0\u1ee3ng gi\u00f2n v\u1eadt li\u1ec7u do nhi\u1ec7t \u0111\u1ed9 th\u1ea5p g\u00e2y ra. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra m\u1ed9t r\u00e0o c\u1ea3n an to\u00e0n v\u1eefng ch\u1eafc cho c\u00e1c c\u00f4ng tr\u00ecnh x\u00e2y d\u1ef1ng \u1edf nh\u1eefng v\u00f9ng c\u1ef1c l\u1ea1nh, n\u00e2ng cao \u0111\u1ed9 tin c\u1eady v\u00e0 hi\u1ec7u qu\u1ea3 ho\u1ea1t \u0111\u1ed9ng c\u1ee7a thi\u1ebft b\u1ecb.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"q-355-nh-en-s-355-j-2-w-astm-a-588\"><strong>Q355NH (EN S355J2W\/ASTM A588<\/strong>)<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1440\" height=\"960\" src=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q355NH.jpg\" alt=\"\" class=\"wp-image-16947\"><\/figure>\n\n\n\n<p>Th\u00e9p t\u1ea5m Q355NH l\u00e0 lo\u1ea1i th\u00e9p ch\u1ed1ng \u0103n m\u00f2n trong kh\u00ed quy\u1ec3n, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 th\u00e9p ch\u1ecbu th\u1eddi ti\u1ebft. C\u00e1c k\u00fd hi\u1ec7u \u201cN\u201d v\u00e0 \u201cH\u201d th\u01b0\u1eddng th\u1ec3 hi\u1ec7n c\u00e1c y\u00eau c\u1ea7u v\u1ec1 qu\u00e1 tr\u00ecnh t\u00f4i luy\u1ec7n v\u00e0 c\u1ea3i thi\u1ec7n \u0111\u1ed9 d\u1ebbo dai \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p. Qu\u00e1 tr\u00ecnh t\u00f4i luy\u1ec7n (gi\u1eef \u1edf nhi\u1ec7t \u0111\u1ed9 tr\u00ean nhi\u1ec7t \u0111\u1ed9 chuy\u1ec3n pha sau \u0111\u00f3 l\u00e0m ngu\u1ed9i b\u1eb1ng kh\u00f4ng kh\u00ed) c\u00f3 th\u1ec3 tinh luy\u1ec7n c\u00e1c h\u1ea1t, t\u1ea1o th\u00e0nh c\u1ea5u tr\u00fac ferit-pealit m\u1ecbn h\u01a1n v\u00e0 l\u00e0m cho c\u00e1c \u0111\u1eb7c t\u00ednh \u0111\u1ed3ng nh\u1ea5t h\u01a1n theo chi\u1ec1u d\u00e0y.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc <\/th><th>\u0110i\u1ec3m ch\u1ea5t l\u01b0\u1ee3ng<\/th><th>T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc<\/th><th>Th\u00f4ng s\u1ed1<\/th><\/tr><\/thead><tbody><tr><td>Cacbon (C)<\/td><td>\u22640,16%<\/td><td>\u1ee8ng su\u1ea5t ch\u1ea3y<\/td><td>\u2265355MPa<\/td><\/tr><tr><td>Silicon (Si)<\/td><td>\u22640,5%<\/td><td>\u0110\u1ed9 b\u1ec1n k\u00e9o<\/td><td>490-630MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>0.5%-1.5%<\/td><td>\u0110\u1ed9 b\u1ec1n va \u0111\u1eadp<\/td><td>\u226534 J (Th\u1eed nghi\u1ec7m va \u0111\u1eadp \u1edf -40\u2103)<\/td><\/tr><tr><td>L\u01b0u hu\u1ef3nh (S)<\/td><td>\u22640,03%<\/td><td>\u0110\u1ed9 gi\u00e3n ph\u1ea7n tr\u0103m<\/td><td>\u226517% (\u0111\u1ed9 d\u00e0y \u2264 16mm)<\/td><\/tr><tr><td>Ph\u1ed1t pho (P)<\/td><td>\u22640,03%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>So v\u1edbi th\u00e9p cacbon th\u1ea5p, th\u00e9p Q355NH \u0111\u1ea1t \u0111\u01b0\u1ee3c kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu th\u1eddi ti\u1ebft t\u1ed1t h\u01a1n t\u1eeb 2 \u0111\u1ebfn 8 l\u1ea7n, ch\u1ee7 y\u1ebfu l\u00e0 do vi\u1ec7c b\u1ed5 sung c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim \u0111\u1eb7c bi\u1ec7t v\u00e0o c\u00f4ng th\u1ee9c c\u1ee7a n\u00f3.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>C\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim<\/th><th>Gi\u1edbi h\u1ea1n tr\u00ean c\u1ee7a n\u1ed9i dung<\/th><th>Ch\u1ee9c n\u0103ng ch\u00ednh<\/th><\/tr><\/thead><tbody><tr><td>Crom (Cr)<\/td><td>0.4%-0.8%<\/td><td>C\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 t\u0103ng c\u01b0\u1eddng t\u00ednh \u1ed5n \u0111\u1ecbnh c\u1ee7a m\u00f4.<\/td><\/tr><tr><td>Niken (Ni)<\/td><td>\u22640,65%<\/td><td>C\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 d\u1ebbo dai \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p v\u00e0 gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 chuy\u1ec3n ti\u1ebfp t\u1eeb tr\u1ea1ng th\u00e1i d\u1ebbo sang tr\u1ea1ng th\u00e1i gi\u00f2n.<\/td><\/tr><tr><td>\u0110\u1ed3ng (Cu)<\/td><td>0.25%-0.55%<\/td><td>C\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n kh\u00ed quy\u1ec3n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>C\u00f3 th\u1ec3 th\u1ea5y r\u1eb1ng th\u00e9p Q355NH v\u1eabn gi\u1eef \u0111\u01b0\u1ee3c \u0111\u1ed9 b\u1ec1n, \u0111\u1ed9 d\u1ebbo dai v\u00e0 kh\u1ea3 n\u0103ng h\u00e0n c\u1ee7a th\u00e9p k\u1ebft c\u1ea5u th\u00f4ng th\u01b0\u1eddng, \u0111\u1ed3ng th\u1eddi s\u1edf h\u1eefu \u0111\u1ed9 d\u1ebbo, kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n, kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ecfi c\u1ee7a th\u00e9p ch\u1ea5t l\u01b0\u1ee3ng cao. H\u01a1n n\u1eefa, kh\u1ea3 n\u0103ng s\u01a1n ph\u1ee7 c\u1ee7a Q355NH cao g\u1ea5p 1,5-10 l\u1ea7n so v\u1edbi th\u00e9p carbon th\u00f4ng th\u01b0\u1eddng. Do \u0111\u00f3, n\u00f3 lo\u1ea1i b\u1ecf nhu c\u1ea7u s\u01a1n ph\u1ee7 v\u00e0 b\u1ea3o tr\u00ec th\u01b0\u1eddng xuy\u00ean, gi\u00fap gi\u1ea3m thi\u1ec3u hi\u1ec7u qu\u1ea3 t\u1ed5ng chi ph\u00ed v\u00f2ng \u0111\u1eddi c\u1ee7a c\u1ea7n c\u1ea9u ngo\u00e0i tr\u1eddi. Kh\u1ea3 n\u0103ng ch\u1ed1ng g\u1ec9, ch\u1ed1ng \u0103n m\u00f2n k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd c\u1ee7a c\u00e1c b\u1ed9 ph\u1eadn v\u00e0 gi\u1ea3m ti\u00eau hao v\u1eadt li\u1ec7u khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh lo\u1ea1i th\u00e9p \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng cho c\u00e1c b\u1ed9 ph\u1eadn k\u1ebft c\u1ea5u c\u1ea7n c\u1ea9u trong \u0111i\u1ec1u ki\u1ec7n l\u00e0m vi\u1ec7c ph\u1ee9c t\u1ea1p nh\u01b0 m\u00f4i tr\u01b0\u1eddng ngo\u00e0i tr\u1eddi v\u00e0 ven bi\u1ec3n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"q-450-nqr-1-en-s-355-k-2-w-astm-a-633-grade-c-d\"><strong>Q450NQR1 (EN S355K2W\/ASTM A633 C\u1ea5p C\/D)<\/strong>)<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1248\" height=\"832\" src=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q450NQR1.jpg\" alt=\"\" class=\"wp-image-16948\"><\/figure>\n\n\n\n<p>Th\u00e9p Q450NQR1 l\u00e0 lo\u1ea1i th\u00e9p ch\u1ecbu th\u1eddi ti\u1ebft c\u01b0\u1eddng \u0111\u1ed9 cao, c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng nh\u1eb9, \u0111\u1ed9 b\u1ec1n va \u0111\u1eadp \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n kh\u00ed quy\u1ec3n tuy\u1ec7t v\u1eddi, th\u00edch h\u1ee3p s\u1eed d\u1ee5ng trong nhi\u1ec1u \u0111i\u1ec1u ki\u1ec7n kh\u00ed h\u1eadu kh\u1eafc nghi\u1ec7t. NQR l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a th\u00e9p ch\u1ecbu \u0103n m\u00f2n kh\u00ed quy\u1ec3n (th\u00e9p ch\u1ecbu th\u1eddi ti\u1ebft), m\u1ed9t lo\u1ea1i th\u00e9p h\u1ee3p kim th\u1ea5p c\u01b0\u1eddng \u0111\u1ed9 cao \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t cho m\u00f4i tr\u01b0\u1eddng ngo\u00e0i tr\u1eddi, ven bi\u1ec3n v\u00e0 c\u00e1c m\u00f4i tr\u01b0\u1eddng \u0103n m\u00f2n kh\u00e1c; 1 l\u00e0 s\u1ed1 hi\u1ec7u m\u00e1c th\u00e9p, th\u1ec3 hi\u1ec7n t\u1ef7 l\u1ec7 h\u1ee3p kim v\u00e0 m\u1ee9c hi\u1ec7u su\u1ea5t c\u1ee5 th\u1ec3.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc <\/th><th>\u0110i\u1ec3m ch\u1ea5t l\u01b0\u1ee3ng<\/th><th>T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc<\/th><th>Th\u00f4ng s\u1ed1<\/th><\/tr><\/thead><tbody><tr><td>Cacbon (C)<\/td><td>\u22640,12%<\/td><td>\u1ee8ng su\u1ea5t ch\u1ea3y<\/td><td>\u2265450MPa<\/td><\/tr><tr><td>Silicon (Si)<\/td><td>\u22640,75%<\/td><td>\u0110\u1ed9 b\u1ec1n k\u00e9o<\/td><td>\u2265550MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>\u22641.5%<\/td><td>\u0110\u1ed9 b\u1ec1n va \u0111\u1eadp<\/td><td>\u226560 J (Th\u1eed nghi\u1ec7m va \u0111\u1eadp \u1edf -40\u2103)<\/td><\/tr><tr><td>L\u01b0u hu\u1ef3nh (S)<\/td><td>\u22640,008%<\/td><td>\u0110\u1ed9 gi\u00e3n ph\u1ea7n tr\u0103m<\/td><td>\u226520% (\u0111\u1ed9 d\u00e0y \u2264 14mm)<\/td><\/tr><tr><td>Ph\u1ed1t pho (P)<\/td><td>\u22640,025%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Nh\u01b0 \u0111\u00e3 th\u1ea5y t\u1eeb c\u00e1c \u0111\u1eb7c t\u00ednh c\u01a1 b\u1ea3n n\u00eau tr\u00ean, Q450NQR1 \u0111\u1ea1t \u0111\u01b0\u1ee3c ba \u01b0u \u0111i\u1ec3m v\u01b0\u1ee3t tr\u1ed9i l\u00e0 \u0111\u1ed9 b\u1ec1n cao, kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu th\u1eddi ti\u1ebft v\u00e0 \u0111\u1ed9 d\u1ebbo dai \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p, nh\u1edd t\u1ef7 l\u1ec7 ch\u00ednh x\u00e1c c\u1ee7a c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>C\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim<\/th><th>Gi\u1edbi h\u1ea1n tr\u00ean c\u1ee7a n\u1ed9i dung<\/th><th>Ch\u1ee9c n\u0103ng ch\u00ednh<\/th><\/tr><\/thead><tbody><tr><td>Crom (Cr)<\/td><td>0.3%-1.25%<\/td><td>C\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 t\u0103ng c\u01b0\u1eddng t\u00ednh \u1ed5n \u0111\u1ecbnh c\u1ee7a m\u00f4.<\/td><\/tr><tr><td>Niken (Ni)<\/td><td>0.125-0.65%<\/td><td>C\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 d\u1ebbo dai \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p v\u00e0 gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 chuy\u1ec3n ti\u1ebfp t\u1eeb tr\u1ea1ng th\u00e1i d\u1ebbo sang tr\u1ea1ng th\u00e1i gi\u00f2n.<\/td><\/tr><tr><td>\u0110\u1ed3ng (Cu)<\/td><td>0.25%-0.55%<\/td><td>C\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n kh\u00ed quy\u1ec3n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>V\u1edbi h\u00e0m l\u01b0\u1ee3ng cacbon th\u1ea5p v\u00e0 h\u00e0m l\u01b0\u1ee3ng l\u01b0u hu\u1ef3nh c\u1ef1c th\u1ea5p, k\u1ebft h\u1ee3p v\u1edbi hi\u1ec7u \u1ee9ng hi\u1ec7p \u0111\u1ed3ng c\u1ee7a c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim Cr, Ni v\u00e0 Cu, th\u00e9p Q450NQR1 s\u1edf h\u1eefu hi\u1ec7u n\u0103ng to\u00e0n di\u1ec7n tuy\u1ec7t v\u1eddi, \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u c\u1ee7a ti\u00eau chu\u1ea9n ng\u00e0nh th\u00e9p ch\u1ecbu th\u1eddi ti\u1ebft. N\u00f3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa \u0111\u1ed9 b\u1ec1n cao, kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu th\u1eddi ti\u1ebft v\u00e0 \u0111\u1ed9 d\u1ebbo dai \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p, tr\u1edf th\u00e0nh v\u1eadt li\u1ec7u l\u00fd t\u01b0\u1edfng cho c\u1ea7n c\u1ea9u trong \u0111i\u1ec1u ki\u1ec7n l\u00e0m vi\u1ec7c kh\u1eafc nghi\u1ec7t nh\u01b0 t\u1ea1i c\u1ea3ng v\u00e0 b\u00e3i ch\u1ee9a ngo\u00e0i tr\u1eddi.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"q-690-e-en-s-690-ql-astm-a-514-gr-b\"><strong>Q690E (EN S690QL\/ASTM A514 Gr.B)<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1248\" height=\"832\" src=\"https:\/\/www.dgcrane.com\/wp-content\/uploads\/2026\/04\/Q690E.jpg\" alt=\"\" class=\"wp-image-16949\"><\/figure>\n\n\n\n<p>Q690E l\u00e0 v\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 b\u1ec1n cao. Th\u00f4ng qua qu\u00e1 tr\u00ecnh h\u00e0n laser v\u00e0 x\u1eed l\u00fd gi\u1ea3m \u1ee9ng su\u1ea5t, tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 gi\u1ea3m 151 t\u1ea5n\/t\u1ea5n, kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i t\u0103ng 251 t\u1ea5n\/t\u1ea5n v\u00e0 tu\u1ed5i th\u1ecd m\u1ecfi k\u00e9o d\u00e0i 371 t\u1ea5n\/t\u1ea5n so v\u1edbi m\u1ee9c trung b\u00ecnh c\u1ee7a ng\u00e0nh. N\u00f3 \u0111\u00e1p \u1ee9ng c\u1ea5p \u0111\u1ed9 l\u00e0m vi\u1ec7c h\u1ea1ng n\u1eb7ng A7 v\u00e0 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c lo\u1ea1i c\u1ea7n c\u1ea9u chuy\u00ean d\u1ee5ng t\u1ea3i tr\u1ecdng l\u1edbn, hi\u1ec7u su\u1ea5t cao, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u1ea7n c\u1ea9u g\u00e1o m\u00fac 300 t\u1ea5n trong ng\u00e0nh luy\u1ec7n kim v\u00e0 c\u1ea7n c\u1ea9u n\u00e2ng h\u1ea1 th\u00e2n t\u00e0u 200 t\u1ea5n trong ng\u00e0nh \u0111\u00f3ng t\u00e0u. C\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a n\u00f3 nh\u01b0 sau:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc <\/th><th>\u0110i\u1ec3m ch\u1ea5t l\u01b0\u1ee3ng<\/th><th>T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc<\/th><th>Th\u00f4ng s\u1ed1<\/th><\/tr><\/thead><tbody><tr><td>Cacbon (C)<\/td><td>\u22640,18%<\/td><td>\u1ee8ng su\u1ea5t ch\u1ea3y<\/td><td>\u2265690MPa<\/td><\/tr><tr><td>Silicon (Si)<\/td><td>\u22640,6%<\/td><td>\u0110\u1ed9 b\u1ec1n k\u00e9o<\/td><td>770-940MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>\u22642.0%<\/td><td>\u0110\u1ed9 b\u1ec1n va \u0111\u1eadp<\/td><td>\u226534 J (Th\u1eed nghi\u1ec7m va \u0111\u1eadp \u1edf -20\u2103)<\/td><\/tr><tr><td>L\u01b0u hu\u1ef3nh (S)<\/td><td>\u22640,025%<\/td><td>\u0110\u1ed9 gi\u00e3n ph\u1ea7n tr\u0103m<\/td><td>\u226514% (\u0111\u1ed9 d\u00e0y \u2264 16mm)<\/td><\/tr><tr><td>Ph\u1ed1t pho (P)<\/td><td>\u22640,03%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Trong khi \u0111\u00f3, \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c m\u1ee5c ti\u00eau k\u00e9p v\u1ec1 tr\u1ecdng l\u01b0\u1ee3ng nh\u1eb9 v\u00e0 \u0111\u1ed9 b\u1ec1n cao, th\u00e9p Q690E t\u1ed1i \u01b0u h\u00f3a c\u1ea5u tr\u00fac vi m\u00f4 v\u00e0 c\u00e1c \u0111\u1eb7c t\u00ednh c\u1ee7a n\u00f3 b\u1eb1ng c\u00e1ch b\u1ed5 sung c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim c\u1ee5 th\u1ec3. H\u00e0m l\u01b0\u1ee3ng v\u00e0 ch\u1ee9c n\u0103ng c\u1ee7a t\u1eebng nguy\u00ean t\u1ed1 ch\u00ednh nh\u01b0 sau:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>C\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim<\/th><th>Gi\u1edbi h\u1ea1n tr\u00ean c\u1ee7a n\u1ed9i dung<\/th><th>Ch\u1ee9c n\u0103ng ch\u00ednh<\/th><\/tr><\/thead><tbody><tr><td>Crom (Cr)<\/td><td>\u22641.0%<\/td><td>C\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 t\u0103ng c\u01b0\u1eddng t\u00ednh \u1ed5n \u0111\u1ecbnh c\u1ee7a m\u00f4.<\/td><\/tr><tr><td>Niken (Ni)<\/td><td>\u22640,8%<\/td><td>C\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 d\u1ebbo dai \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p v\u00e0 gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 chuy\u1ec3n ti\u1ebfp t\u1eeb tr\u1ea1ng th\u00e1i d\u1ebbo sang tr\u1ea1ng th\u00e1i gi\u00f2n.<\/td><\/tr><tr><td>\u0110\u1ed3ng (Cu)<\/td><td>\u22640,5%<\/td><td>C\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n kh\u00ed quy\u1ec3n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Do \u0111\u00f3, th\u00e9p Q690E c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i c\u1ef1c cao, c\u00f3 th\u1ec3 t\u0103ng gi\u1edbi h\u1ea1n t\u1ea3i tr\u1ecdng t\u1ed1i \u0111a trong khi gi\u1ea3m k\u00edch th\u01b0\u1edbc m\u1eb7t c\u1eaft ngang c\u1ee7a d\u1ea7m ch\u00ednh; n\u00f3 c\u0169ng c\u00f3 \u0111\u1ed9 d\u1ebbo dai \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p tuy\u1ec7t v\u1eddi v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ecfi t\u1ed1t, l\u00e0m cho n\u00f3 ph\u00f9 h\u1ee3p v\u1edbi ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c \u1edf t\u1ea7n s\u1ed1 cao, t\u1ea3i tr\u1ecdng n\u1eb7ng, nh\u01b0ng chi ph\u00ed t\u01b0\u01a1ng \u0111\u1ed1i cao, v\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn theo y\u00eau c\u1ea7u ch\u1ecbu t\u1ea3i th\u1ef1c t\u1ebf.<\/p>\n\n\n\n<p>V\u1edbi h\u01a1n 20 n\u0103m kinh nghi\u1ec7m trong l\u0129nh v\u1ef1c v\u1eadt li\u1ec7u k\u1ebft c\u1ea5u th\u00e9p cho c\u1ea7n c\u1ea9u, <strong>DGCRANE<\/strong> Nh\u1eadn th\u1ee9c s\u00e2u s\u1eafc r\u1eb1ng m\u1ecdi chi ti\u1ebft trong vi\u1ec7c l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u \u0111\u1ec1u \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn h\u1ec7 s\u1ed1 an to\u00e0n, tu\u1ed5i th\u1ecd v\u00e0 chi ph\u00ed v\u00f2ng \u0111\u1eddi c\u1ee7a thi\u1ebft b\u1ecb trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n t\u1ea3i tr\u1ecdng, c\u1ea5p \u0111\u1ed9 l\u00e0m vi\u1ec7c v\u00e0 m\u00f4i tr\u01b0\u1eddng v\u1eadn h\u00e0nh kh\u00e1c nhau. <strong>DGCRANE<\/strong> Ch\u00fang t\u00f4i c\u00f3 th\u1ec3 cung c\u1ea5p ch\u00ednh x\u00e1c \u0111\u1ea7y \u0111\u1ee7 c\u00e1c lo\u1ea1i th\u00e9p ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf, bao g\u1ed3m Q355B, Q460NE v\u00e0 Q690E, \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ri\u00eang theo \u0111i\u1ec1u ki\u1ec7n l\u00e0m vi\u1ec7c th\u1ef1c t\u1ebf c\u1ee7a b\u1ea1n, ch\u1eb3ng h\u1ea1n nh\u01b0 \u0111i\u1ec1u ki\u1ec7n c\u1ef1c l\u1ea1nh, phun mu\u1ed1i cao v\u00e0 ho\u1ea1t \u0111\u1ed9ng li\u00ean t\u1ee5c v\u1edbi t\u1ea3i tr\u1ecdng n\u1eb7ng, \u0111\u00e1p \u1ee9ng \u0111\u1ea7y \u0111\u1ee7 nhu c\u1ea7u v\u1eadt li\u1ec7u cho c\u1ea3 c\u00e1c t\u00ecnh hu\u1ed1ng th\u00f4ng th\u01b0\u1eddng v\u00e0 \u0111\u1eb7c bi\u1ec7t.<\/p>\n\n\n\n<p><strong>DGCRANE<\/strong> Ch\u00fang t\u00f4i cung c\u1ea5p gi\u1ea3i ph\u00e1p tr\u1ecdn g\u00f3i to\u00e0n di\u1ec7n, bao g\u1ed3m t\u01b0 v\u1ea5n v\u1eadt li\u1ec7u theo y\u00eau c\u1ea7u, c\u1eaft, h\u00e0n v\u00e0 x\u1eed l\u00fd ch\u1ed1ng \u0103n m\u00f2n, c\u0169ng nh\u01b0 truy xu\u1ea5t ngu\u1ed3n g\u1ed1c ch\u1ea5t l\u01b0\u1ee3ng \u0111\u1ea7y \u0111\u1ee7 v\u00e0 h\u1ed7 tr\u1ee3 b\u1ea3o h\u00e0nh sau b\u00e1n h\u00e0ng. Ch\u00fang t\u00f4i gi\u00fap b\u1ea1n tr\u00e1nh r\u1ee7i ro l\u1ef1a ch\u1ecdn ngay t\u1eeb ngu\u1ed3n, cho ph\u00e9p v\u1eadn h\u00e0nh c\u1ea7n c\u1ea9u an to\u00e0n h\u01a1n, k\u1ebft c\u1ea5u b\u1ec1n v\u1eefng h\u01a1n v\u00e0 ki\u1ec3m so\u00e1t chi ph\u00ed t\u1ed5ng th\u1ec3 t\u1ed1t h\u01a1n.<\/p>","protected":false},"excerpt":{"rendered":"D\u1ea7m ch\u00ednh, l\u00e0 c\u1ea5u tr\u00fac ch\u1ecbu l\u1ef1c ch\u00ednh c\u1ee7a c\u1ea7n c\u1ea9u, th\u01b0\u1eddng chi\u1ebfm m\u1ed9t ph\u1ea7n \u0111\u00e1ng k\u1ec3 tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a n\u00f3. D\u1ea7m ch\u00ednh c\u1ee7a c\u1ea7n c\u1ea9u tr\u00ean cao chi\u1ebfm t\u1eeb 401 t\u1ea5n \u0111\u1ebfn 601 t\u1ea5n tr\u1ecdng l\u01b0\u1ee3ng t\u1ed5ng th\u1ec3 c\u1ee7a c\u1ea7n c\u1ea9u, trong khi d\u1ea7m ch\u00ednh c\u1ee7a c\u1ea7n c\u1ea9u gi\u00e0n v\u01b0\u1ee3t qu\u00e1 301 t\u1ea5n. V\u1eadt li\u1ec7u th\u00e9p c\u1ee7a d\u1ea7m ch\u00ednh quy\u1ebft \u0111\u1ecbnh tr\u1ef1c ti\u1ebfp \u0111\u1ebfn kh\u1ea3 n\u0103ng ch\u1ecbu t\u1ea3i t\u1ed5ng th\u1ec3, an to\u00e0n v\u1eadn h\u00e0nh v\u00e0 [\u2026]","protected":false},"featured_media":16939,"parent":0,"menu_order":0,"template":"single-SEO-Table.php","posts_category":[351],"posts_tag":[206,54,6],"class_list":["post-16938","posts","type-posts","status-publish","has-post-thumbnail","hentry","posts_category-blog","posts_tag-dgcrane","posts_tag-gantry-crane","posts_tag-overhead-crane"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.dgcrane.com\/vi\/wp-json\/wp\/v2\/xmxposts\/16938"}],"collection":[{"href":"https:\/\/www.dgcrane.com\/vi\/wp-json\/wp\/v2\/xmxposts"}],"about":[{"href":"https:\/\/www.dgcrane.com\/vi\/wp-json\/wp\/v2\/types\/posts"}],"version-history":[{"count":10,"href":"https:\/\/www.dgcrane.com\/vi\/wp-json\/wp\/v2\/xmxposts\/16938\/revisions"}],"predecessor-version":[{"id":16959,"href":"https:\/\/www.dgcrane.com\/vi\/wp-json\/wp\/v2\/xmxposts\/16938\/revisions\/16959"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dgcrane.com\/vi\/wp-json\/wp\/v2\/media\/16939"}],"wp:attachment":[{"href":"https:\/\/www.dgcrane.com\/vi\/wp-json\/wp\/v2\/media?parent=16938"}],"wp:term":[{"taxonomy":"posts_category","embeddable":true,"href":"https:\/\/www.dgcrane.com\/vi\/wp-json\/wp\/v2\/posts_category?post=16938"},{"taxonomy":"posts_tag","embeddable":true,"href":"https:\/\/www.dgcrane.com\/vi\/wp-json\/wp\/v2\/posts_tag?post=16938"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}