{"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\/cs\/posts\/overhead-and-gantry-cranes-main-girder\/","title":{"rendered":"Hlavn\u00ed nosn\u00edk mostov\u00fdch a port\u00e1lov\u00fdch je\u0159\u00e1b\u016f: Ultim\u00e1tn\u00ed pr\u016fvodce ocelov\u00fdmi konstrukcemi"},"content":{"rendered":"<div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><p>Obsah<\/p><nav><ul><li><a href=\"#low-carbon-steel-top-choice-for-light-small-overhead-and-gantry-cranes\">N\u00edzkouhl\u00edkov\u00e1 ocel: Nejlep\u0161\u00ed volba pro lehk\u00e9 a mal\u00e9 mostov\u00e9 a port\u00e1lov\u00e9 je\u0159\u00e1by<\/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\">Vysokopevnostn\u00ed n\u00edzkolegovan\u00e1 ocel: Ide\u00e1ln\u00ed pro st\u0159edn\u011b t\u011b\u017ek\u00e9 a t\u011b\u017ek\u00e9 mostov\u00e9 a port\u00e1lov\u00e9 je\u0159\u00e1by<\/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\">Speci\u00e1ln\u00ed ocel: Volba pro mostov\u00e9 a port\u00e1lov\u00e9 je\u0159\u00e1by pou\u017e\u00edvan\u00e9 v extr\u00e9mn\u00edch podm\u00ednk\u00e1ch<\/a><ul><li><a href=\"#q-460-ne-ens-460-nl-astm-a-537-cl-2\">Q460NE (ENS460NL\/ASTM A537 T\u0159. 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 t\u0159\u00edda 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>Hlavn\u00ed nosn\u00edk, jako\u017eto prim\u00e1rn\u00ed nosn\u00e1 konstrukce je\u0159\u00e1bu, \u010dasto p\u0159edstavuje v\u00fdznamnou \u010d\u00e1st jeho hmotnosti. <a href=\"https:\/\/www.dgcrane.com\/cs\/overhead-cranes\/\">Mostov\u00fd je\u0159\u00e1b<\/a> Hlavn\u00ed nosn\u00edk p\u0159edstavuje 40%-60% celkov\u00e9 hmotnosti je\u0159\u00e1bu, zat\u00edmco hlavn\u00ed nosn\u00edk port\u00e1lov\u00e9ho je\u0159\u00e1bu p\u0159esahuje 30%. Ocelov\u00fd materi\u00e1l hlavn\u00edho nosn\u00edku p\u0159\u00edmo ur\u010duje celkovou \u00fanosnost, provozn\u00ed bezpe\u010dnost a komplexn\u00ed n\u00e1klady je\u0159\u00e1bu. Data \u010c\u00ednsk\u00e9 asociace t\u011b\u017ek\u00e9ho stroj\u00edrenstv\u00ed ukazuj\u00ed, \u017ee v\u00edce ne\u017e 65% konstruk\u010dn\u00edch poruch pramen\u00ed z nesouladu oceli hlavn\u00edho nosn\u00edku a provozn\u00edch podm\u00ednek. Abychom v\u00e1m pomohli sn\u00ed\u017eit rizika spojen\u00e1 se za\u0159\u00edzen\u00edm a optimalizovat cel\u00fd proces v\u00fdb\u011bru, sestavili jsme tabulku porovn\u00e1n\u00ed parametr\u016f pro b\u011b\u017en\u00e9 ocelov\u00e9 materi\u00e1ly mostov\u00fdch a port\u00e1lov\u00fdch je\u0159\u00e1b\u016f. N\u00e1sleduj\u00edc\u00ed text bude analyzovat z\u00e1kladn\u00ed vlastnosti r\u016fzn\u00fdch ocelov\u00fdch materi\u00e1l\u016f vhodn\u00fdch pro hlavn\u00ed nosn\u00edk.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Ocelov\u00fd materi\u00e1l<\/th><th>aplikace<\/th><th>\u010c\u00edna (VB\/VB\/T)<\/th><th>Evropa (EN10025)<\/th><th>USA (ASTM\/AISC)<\/th><th>Mez kluzu (MPa)<\/th><\/tr><\/thead><tbody><tr><td>N\u00edzkouhl\u00edkov\u00e1 ocel<\/td><td>\u226410t, mostov\u00e9 a port\u00e1lov\u00e9 je\u0159\u00e1by<\/td><td>Q235B\/Q235C\/Q235D<\/td><td>S235JR\/S235J2<\/td><td>A283\/A1011<\/td><td>\u2265235<\/td><\/tr><tr><td rowspan=\"3\">Vysokopevnostn\u00ed n\u00edzkolegovan\u00e1 ocel<\/td><td>10t-50t, mostov\u00e9 a port\u00e1lov\u00e9 je\u0159\u00e1by<\/td><td>Q355B<\/td><td>S355JR<\/td><td>A572 Gr.50<\/td><td>\u2265355<\/td><\/tr><tr><td rowspan=\"2\">50t-300t, mostov\u00e9 a port\u00e1lov\u00e9 je\u0159\u00e1by<\/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\">Ocel pro speci\u00e1ln\u00ed pou\u017eit\u00ed<\/td><td rowspan=\"3\">n\u00edzkoteplotn\u00ed oblast s vysok\u00fdm dopadem, chladn\u00e9 podneb\u00ed, p\u0159\u00edstavy<\/td><td>Q460NE<\/td><td>S460NL<\/td><td>A537 \u010cl. 2<\/td><td>\u2265460<\/td><\/tr><tr><td>Q355NH<\/td><td>S355J2W<\/td><td>A633 Sk. C\/D<\/td><td>\u2265355<\/td><\/tr><tr><td>Q690E<\/td><td>S690QL<\/td><td>A514 Sk.B<\/td><td>\u2265690<\/td><\/tr><tr><td>pov\u011btrnostn\u00ed vlivy, venkovn\u00ed provoz, sn\u00ed\u017een\u00e1 \u00fadr\u017eba<\/td><td>Q450NQR1<\/td><td>S355K2W<\/td><td>A709 Gr.50W<\/td><td>\u2265450<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Tabulka porovn\u00e1n\u00ed parametr\u016f pro b\u011b\u017en\u00e9 ocelov\u00e9 materi\u00e1ly<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"low-carbon-steel-top-choice-for-light-small-overhead-and-gantry-cranes\">N\u00edzkouhl\u00edkov\u00e1 ocel: Nejlep\u0161\u00ed volba pro lehk\u00e9 a mal\u00e9 mostov\u00e9 a port\u00e1lov\u00e9 je\u0159\u00e1by<\/h2>\n\n\n\n<p>D\u00edky vynikaj\u00edc\u00ed plasticit\u011b, sva\u0159itelnosti a cenov\u00fdm v\u00fdhod\u00e1m je n\u00edzkouhl\u00edkov\u00e1 ocel (p\u0159\u00edkladem je Q235B \/ S235JR \/ A283) hlavn\u00edm cenov\u011b dostupn\u00fdm materi\u00e1lem pro hlavn\u00ed nosn\u00edky mostov\u00fdch a port\u00e1lov\u00fdch je\u0159\u00e1b\u016f v aplikac\u00edch s n\u00edzk\u00fdm zat\u00ed\u017een\u00edm a n\u00edzkou pracovn\u00ed t\u0159\u00eddou a zab\u00edr\u00e1 p\u0159ibli\u017en\u011b 221 TP1T trhu s materi\u00e1ly pro lehk\u00e9 mal\u00e9 je\u0159\u00e1by (\u226420 t).<\/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>Q235B, nejb\u011b\u017en\u011bj\u0161\u00ed typ n\u00edzkouhl\u00edkov\u00e9 oceli pou\u017e\u00edvan\u00e9 ve zdvihac\u00edch za\u0159\u00edzen\u00edch, je obzvl\u00e1\u0161t\u011b roz\u0161\u00ed\u0159en\u00fd u lehk\u00fdch je\u0159\u00e1b\u016f s n\u00edzkou pracovn\u00ed t\u0159\u00eddou, jako jsou p\u011btitunov\u00e9 je\u0159\u00e1by. <a href=\"https:\/\/www.dgcrane.com\/cs\/double-girder-overhead-crane\/\">dvounosn\u00edkov\u00e9 mostov\u00e9 je\u0159\u00e1by<\/a> pou\u017e\u00edvan\u00e9 ve skladech a t\u0159\u00edtunov\u00e9 jednonosn\u00edkov\u00e9 nadzemn\u00ed konstrukce a <a href=\"https:\/\/www.dgcrane.com\/cs\/gantry-cranes\/\">port\u00e1lov\u00e9 je\u0159\u00e1by<\/a> v d\u00edln\u00e1ch. Jeho hlavn\u00ed chemick\u00e9 slo\u017een\u00ed a mechanick\u00e9 vlastnosti jsou uvedeny v tabulce n\u00ed\u017ee:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Chemick\u00e9 slo\u017een\u00ed<\/th><th>Sk\u00f3re kvality<\/th><th>Mechanick\u00e9 vlastnosti<\/th><th>Parametry<\/th><\/tr><\/thead><tbody><tr><td>Uhl\u00edk (C)<\/td><td>\u22640,2%<\/td><td>Mez kluzu<\/td><td>\u2265235 MPa<\/td><\/tr><tr><td>K\u0159em\u00edk (Si)<\/td><td>\u22640,35%<\/td><td>Pevnost v tahu<\/td><td>370\u2013500 MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>0.3%-0.7%<\/td><td>R\u00e1zov\u00e1 hou\u017eevnatost<\/td><td>\u226527 J (n\u00e1razov\u00e1 zkou\u0161ka p\u0159i 20 \u00b0C)<\/td><\/tr><tr><td>S\u00edra (S)<\/td><td>\u22640,045%<\/td><td>Procentn\u00ed prodlou\u017een\u00ed<\/td><td>\u226521% (tlou\u0161\u0165ka \u2264 16 mm)<\/td><\/tr><tr><td>Fosfor (P)<\/td><td>\u22640,045%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Na z\u00e1klad\u011b v\u00fd\u0161e uveden\u00fdch ukazatel\u016f v\u00fdkonnosti m\u016f\u017eeme d\u00e1le analyzovat hlavn\u00ed v\u00fdhody modelu Q235B:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Vysok\u00fd a n\u00edzk\u00fd obsah uhl\u00edku, vynikaj\u00edc\u00ed sva\u0159ovac\u00ed v\u00fdkon:<\/strong> Hlavn\u00ed nosn\u00edk mostov\u00fdch a port\u00e1lov\u00fdch je\u0159\u00e1b\u016f m\u00e1 hustou a slo\u017eitou svarovou strukturu. N\u00edzk\u00fd obsah uhl\u00edku u oceli Q235B umo\u017e\u0148uje vysokou kvalitu svaru p\u0159i pou\u017eit\u00ed konven\u010dn\u00edch sva\u0159ovac\u00edch proces\u016f, \u010d\u00edm\u017e se sni\u017euje pravd\u011bpodobnost vad svaru a zaji\u0161\u0165uje se vysok\u00e1 stabilita v\u00fdroby.<\/li>\n\n\n\n<li><strong>St\u0159edn\u00ed odolnost, odol\u00e1v\u00e1 b\u011b\u017en\u00fdm n\u00e1raz\u016fm:<\/strong> S r\u00e1zovou energi\u00ed nejm\u00e9n\u011b 27 J p\u0159i pokojov\u00e9 teplot\u011b 20 \u00b0C nab\u00edz\u00ed materi\u00e1l dobrou hou\u017eevnatost. Absorbuje ot\u0159esy a vibrace p\u0159i provozu mostov\u00fdch a port\u00e1lov\u00fdch je\u0159\u00e1b\u016f, odol\u00e1v\u00e1 k\u0159ehk\u00e9mu lomu v d\u016fsledku n\u00e1hl\u00fdch zm\u011bn zat\u00ed\u017een\u00ed a poskytuje bezpe\u010dn\u011bj\u0161\u00ed a spolehliv\u011bj\u0161\u00ed konstruk\u010dn\u00ed vlastnosti.<\/li>\n\n\n\n<li><strong>N\u00edzk\u00e9 n\u00e1klady, vynikaj\u00edc\u00ed pom\u011br n\u00e1klad\u016f a v\u00fdkonu:<\/strong> Q235B m\u00e1 relativn\u011b n\u00edzk\u00e9 v\u00fdrobn\u00ed n\u00e1klady. Nav\u00edc jeho komplexn\u00ed v\u00fdkon spl\u0148uje po\u017eadavky na pou\u017eit\u00ed v\u011bt\u0161iny ocelov\u00fdch konstrukc\u00ed mostov\u00fdch a port\u00e1lov\u00fdch je\u0159\u00e1b\u016f, \u010d\u00edm\u017e efektivn\u011b sni\u017euje v\u00fdrobn\u00ed n\u00e1klady a z\u00e1rove\u0148 zaji\u0161\u0165uje bezpe\u010dnost a spolehlivost, co\u017e vede k vysok\u00e9 n\u00e1kladov\u00e9 efektivit\u011b.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Nicm\u00e9n\u011b vzhledem k omezen\u00edm v pevnostn\u00edm stupni a v\u00fdkonnostn\u00edch charakteristik\u00e1ch samotn\u00e9ho materi\u00e1lu m\u00e1 Q235B tak\u00e9 ur\u010dit\u00e1 omezen\u00ed, a proto:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>N\u00edzk\u00e1 mez kluzu: <\/strong>Q235B m\u00e1 mez kluzu pouze 235 MPa. Za podm\u00ednek vysok\u00e9ho zat\u00ed\u017een\u00ed vy\u017eaduje spln\u011bn\u00ed po\u017eadavk\u016f na pevnost siln\u011bj\u0161\u00ed ocelov\u00e9 plechy, co\u017e v\u00fdrazn\u011b zvy\u0161uje hmotnost konstrukce, co\u017e nen\u00ed vhodn\u00e9 pro pou\u017eit\u00ed ve t\u011b\u017ek\u00fdch podm\u00ednk\u00e1ch a s vysokou frekvenc\u00ed.<\/li>\n\n\n\n<li><strong>\u0160patn\u00e1 odolnost proti korozi:<\/strong> Vzhledem k tomu, \u017ee ocelov\u00e9 konstrukce je\u0159\u00e1b\u016f jsou po del\u0161\u00ed dobu vystaveny pov\u011btrnostn\u00edm vliv\u016fm, je ocel Q235B n\u00e1chyln\u00e1 ke korozi, co\u017e vy\u017eaduje antikorozn\u00ed n\u00e1t\u011br a \u010din\u00ed ji nevhodnou pro vysoce korozivn\u00ed prost\u0159ed\u00ed.<\/li>\n\n\n\n<li><strong>Nevhodn\u00e9 pro prost\u0159ed\u00ed s n\u00edzk\u00fdmi teplotami: <\/strong>Q235B zaru\u010duje r\u00e1zovou hou\u017eevnatost pouze p\u0159i pokojov\u00e9 teplot\u011b. P\u0159i n\u00edzk\u00fdch teplot\u00e1ch je n\u00e1chyln\u00e1 ke k\u0159ehk\u00e9mu lomu. Proto p\u0159\u00edm\u00e9 pou\u017eit\u00ed v prost\u0159ed\u00ed s n\u00edzk\u00fdmi teplotami p\u0159edstavuje bezpe\u010dnostn\u00ed riziko k\u0159ehk\u00e9ho lomu, co\u017e vy\u017eaduje pou\u017eit\u00ed n\u00edzkoteplotn\u00ed oceli nebo oceli t\u0159\u00eddy 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 a Q235D jsou vylep\u0161en\u00e9 varianty Q235B pro n\u00edzk\u00e9 teploty. Vyzna\u010duj\u00ed se stabiln\u011bj\u0161\u00ed n\u00edzkoteplotn\u00ed hou\u017eevnatost\u00ed, men\u0161\u00edm obsahem ne\u010distot a men\u0161\u00edm sklonem ke k\u0159ehnut\u00ed v zim\u011b, d\u00edky \u010demu\u017e jsou vhodn\u00e9 pro mostov\u00e9 a port\u00e1lov\u00e9 je\u0159\u00e1by s vy\u0161\u0161\u00edmi po\u017eadavky na bezpe\u010dnost, odolnost proti n\u00e1razu a stabilitu p\u0159i n\u00edzk\u00fdch teplot\u00e1ch.&nbsp;<\/p>\n\n\n\n<p>Q235C vy\u017eaduje energii n\u00e1razu \u2265 27 J p\u0159i 0 \u00b0C, ale jeho hou\u017eevnatost v\u00fdrazn\u011b kles\u00e1 pod -10 \u00b0C. Q235D vy\u017eaduje energii n\u00e1razu \u2265 27 J p\u0159i -20 \u00b0C, co\u017e m\u016f\u017ee \u00fa\u010dinn\u011b zabr\u00e1nit k\u0159ehk\u00e9mu lomu za n\u00edzk\u00fdch teplot b\u011bhem dlouhodob\u00e9ho venkovn\u00edho provozu v zim\u011b a nab\u00edz\u00ed nejvy\u0161\u0161\u00ed \u00farove\u0148 bezpe\u010dnosti, ale je spojeno s vy\u0161\u0161\u00edmi v\u00fdrobn\u00edmi n\u00e1klady a vy\u0161\u0161\u00ed cenou.<\/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\">Vysokopevnostn\u00ed n\u00edzkolegovan\u00e1 ocel: Ide\u00e1ln\u00ed pro st\u0159edn\u011b t\u011b\u017ek\u00e9 a t\u011b\u017ek\u00e9 mostov\u00e9 a port\u00e1lov\u00e9 je\u0159\u00e1by<\/h2>\n\n\n\n<p>Vysokopevnostn\u00ed n\u00edzkolegovan\u00e1 ocel (zn\u00e1m\u00e1 tak\u00e9 jako HSLA) se vyr\u00e1b\u00ed p\u0159id\u00e1n\u00edm stopov\u00fdch mno\u017estv\u00ed leguj\u00edc\u00edch prvk\u016f, jako jsou V, Nb a Ti, do uhl\u00edkov\u00e9 konstruk\u010dn\u00ed oceli. Vyva\u017euje pevnost a obrobitelnost a v sou\u010dasn\u00e9 dob\u011b je \u201ehlavn\u00edm materi\u00e1lem\u201c pro hlavn\u00ed nosn\u00edky je\u0159\u00e1b\u016f. Na dom\u00e1c\u00edm trhu s materi\u00e1ly pro hlavn\u00ed a koncov\u00e9 nosn\u00edky je\u0159\u00e1b\u016f tvo\u0159\u00ed v\u00edce ne\u017e 581 tun materi\u00e1lu a je prvn\u00ed volbou pro v\u00edce ne\u017e 801 tun materi\u00e1lu pro univerz\u00e1ln\u00ed je\u0159\u00e1by. Je vhodn\u00e1 pro v\u011bt\u0161inu st\u0159edn\u011b t\u011b\u017ek\u00fdch a t\u011b\u017ek\u00fdch provozn\u00edch situac\u00ed, spl\u0148uje po\u017eadavky na provoz a kontrolu n\u00e1klad\u016f, co\u017e z n\u00ed \u010din\u00ed \u201ebezpe\u010dnou volbu\u201c pro kupuj\u00edc\u00ed.<\/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>Q355B, \u0161iroce pou\u017e\u00edvan\u00e1 n\u00edzkolegovan\u00e1 vysokopevnostn\u00ed ocel, je v tomto odv\u011btv\u00ed \u201ez\u00e1kladn\u00edm materi\u00e1lem\u201c a je vhodn\u00e1 pro mostov\u00e9 a port\u00e1lov\u00e9 je\u0159\u00e1by st\u0159edn\u00ed a\u017e lehk\u00e9 nosnosti s pracovn\u00ed t\u0159\u00eddou A3-A5. Jej\u00ed hlavn\u00ed komponenty jsou n\u00e1sleduj\u00edc\u00ed:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Chemick\u00e9 slo\u017een\u00ed <\/th><th>Sk\u00f3re kvality<\/th><th>Mechanick\u00e9 vlastnosti<\/th><th>Parametry<\/th><\/tr><\/thead><tbody><tr><td>Uhl\u00edk (C)<\/td><td>\u22640,24%<\/td><td>Mez kluzu<\/td><td>\u2265355 MPa<\/td><\/tr><tr><td>K\u0159em\u00edk (Si)<\/td><td>\u22640,55%<\/td><td>Pevnost v tahu<\/td><td>470\u2013630 MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>\u22641,6%<\/td><td>R\u00e1zov\u00e1 hou\u017eevnatost<\/td><td>\u226534 J (n\u00e1razov\u00e1 zkou\u0161ka p\u0159i 20 \u00b0C)<\/td><\/tr><tr><td>S\u00edra (S)<\/td><td>\u22640,03%<\/td><td>Procentn\u00ed prodlou\u017een\u00ed<\/td><td>\u226521% (tlou\u0161\u0165ka \u226416 mm)<\/td><\/tr><tr><td>Fosfor (P)<\/td><td>\u22640,035%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Tyto z\u00e1kladn\u00ed parametry jsou p\u0159esn\u011b kl\u00ed\u010dov\u00fdmi faktory, kter\u00e9 umo\u017e\u0148uj\u00ed, aby se Q355B stal hlavn\u00edm materi\u00e1lem pro je\u0159\u00e1by, co\u017e se konkr\u00e9tn\u011b projevuje v n\u00e1sleduj\u00edc\u00edch v\u00fdhod\u00e1ch:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Vysok\u00fd pom\u011br meze kluzu, lehk\u00e1 konstrukce: <\/strong>Pokud je tlou\u0161\u0165ka ocelov\u00e9ho plechu &gt;16 mm, je mez kluzu Q355B p\u0159ibli\u017en\u011b o 511 TP1T vy\u0161\u0161\u00ed ne\u017e u Q235B, co\u017e m\u00e1 za n\u00e1sledek sn\u00ed\u017een\u00ed hmotnosti o 151 TP1T\u2013251 TP1T p\u0159i stejn\u00e9 nosnosti. T\u00edm se sni\u017euje jak vlastn\u00ed hmotnost je\u0159\u00e1bu, tak i tlak zat\u00ed\u017een\u00ed na v\u00fdrobn\u00ed z\u00e1vod.<\/li>\n\n\n\n<li><strong>N\u00edzkouhl\u00edkov\u00fd ekvivalent, lep\u0161\u00ed sva\u0159itelnost:<\/strong> Riziko vzniku trhlin za studena b\u011bhem sva\u0159ov\u00e1n\u00ed je n\u00edzk\u00e9. Pokud je tlou\u0161\u0165ka Q355B \u2264 16 mm, p\u0159edeh\u0159\u00edv\u00e1n\u00ed obvykle nen\u00ed nutn\u00e9, co\u017e umo\u017e\u0148uje p\u0159\u00edm\u00e9 sva\u0159ov\u00e1n\u00ed. To zkracuje v\u00fdrobn\u00ed cyklus a zvy\u0161uje efektivitu v\u00fdroby.<\/li>\n\n\n\n<li><strong>Vynikaj\u00edc\u00ed hou\u017eevnatost za n\u00edzk\u00fdch teplot:<\/strong> Q355B m\u00e1 siln\u011bj\u0161\u00ed p\u0159izp\u016fsobivost n\u00edzk\u00fdm teplot\u00e1m a proch\u00e1z\u00ed r\u00e1zov\u00fdmi zkou\u0161kami p\u0159i -20 \u00b0C. Je vhodn\u00fd pro chladn\u00e9 oblasti nebo konstrukce vy\u017eaduj\u00edc\u00ed vysokou hou\u017eevnatost a \u00fa\u010dinn\u011b zabra\u0148uje k\u0159ehk\u00e9mu lomu v prost\u0159ed\u00ed s n\u00edzk\u00fdmi teplotami.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>P\u0159esto\u017ee Q355B poskytuje vynikaj\u00edc\u00ed celkov\u00fd v\u00fdkon, m\u00e1 znateln\u00e9 limity, zejm\u00e9na p\u0159i n\u00edzk\u00fdch teplot\u00e1ch a korozivn\u00edch podm\u00ednk\u00e1ch, a tak\u00e9 z hlediska sva\u0159ov\u00e1n\u00ed tlust\u00fdch plech\u016f, n\u00e1klad\u016f a obt\u00ed\u017enosti zpracov\u00e1n\u00ed. Konkr\u00e9tn\u00ed nev\u00fdhody jsou n\u00e1sleduj\u00edc\u00ed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Omezen\u00fd v\u00fdkon p\u0159i n\u00edzk\u00fdch teplot\u00e1ch:<\/strong> Q355B zaji\u0161\u0165uje kvalifikovanou r\u00e1zovou hou\u017eevnatost pouze p\u0159i 20 \u00b0C. Jeho hou\u017eevnatost prudce kles\u00e1 pod 0 \u00b0C, co\u017e s sebou nese vysok\u00e9 riziko k\u0159ehkosti za studena p\u0159i pou\u017eit\u00ed v chladn\u00fdch skladech nebo mraziv\u00fdch venkovn\u00edch prostor\u00e1ch. Proto jej nelze pou\u017e\u00edt v extr\u00e9mn\u011b chladn\u00e9m prost\u0159ed\u00ed.<\/li>\n\n\n\n<li><strong>Vysok\u00e1 obt\u00ed\u017enost sva\u0159ov\u00e1n\u00ed tlust\u00fdch plech\u016f:<\/strong> Pokud tlou\u0161\u0165ka oceli Q355B p\u0159es\u00e1hne 25 mm, jej\u00ed uhl\u00edkov\u00fd ekvivalent v\u00fdrazn\u011b stoup\u00e1, co\u017e zvy\u0161uje riziko vzniku trhlin p\u0159i sva\u0159ov\u00e1n\u00ed. B\u011bhem sva\u0159ov\u00e1n\u00ed je nutn\u00fd p\u0159edeh\u0159ev a p\u0159\u00edsn\u00e1 kontrola teploty, co\u017e vede ke slo\u017eit\u011bj\u0161\u00edm postup\u016fm zpracov\u00e1n\u00ed.<\/li>\n\n\n\n<li><strong>Vy\u0161\u0161\u00ed cena ne\u017e Q235B:<\/strong> Q355B je obecn\u011b o 10%\u201315% dra\u017e\u0161\u00ed ne\u017e Q235B. Pro lehk\u00e9 aplikace nebo nenosn\u00e9 komponenty povede pou\u017eit\u00ed Q355B k vy\u0161\u0161\u00edmu v\u00fdkonu bez cenov\u00fdch v\u00fdhod.<\/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>S mez\u00ed kluzu p\u0159es 390 MPa poskytuje Q390B vynikaj\u00edc\u00ed \u00fanosnost a konstruk\u010dn\u00ed bezpe\u010dnost. Za stejn\u00fdch podm\u00ednek zat\u00ed\u017een\u00ed sni\u017euje spot\u0159ebu oceli p\u0159ibli\u017en\u011b o 151 TP1T ve srovn\u00e1n\u00ed s Q355B, d\u00edky \u010demu\u017e se \u0161iroce pou\u017e\u00edv\u00e1 v mostov\u00fdch a port\u00e1lov\u00fdch je\u0159\u00e1bech vy\u017eaduj\u00edc\u00edch vysokou pevnost.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Chemick\u00e9 slo\u017een\u00ed <\/th><th>Sk\u00f3re kvality<\/th><th>Mechanick\u00e9 vlastnosti<\/th><th>Parametry<\/th><\/tr><\/thead><tbody><tr><td>Uhl\u00edk (C)<\/td><td>\u22640,2%<\/td><td>Mez kluzu<\/td><td>\u2265390 MPa<\/td><\/tr><tr><td>K\u0159em\u00edk (Si)<\/td><td>\u22640,5%<\/td><td>Pevnost v tahu<\/td><td>490\u2013650 MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>\u22641,7%<\/td><td>R\u00e1zov\u00e1 hou\u017eevnatost<\/td><td>\u226534 J (n\u00e1razov\u00e1 zkou\u0161ka p\u0159i 20 \u00b0C)<\/td><\/tr><tr><td>S\u00edra (S)<\/td><td>\u22640,035%<\/td><td>Procentn\u00ed prodlou\u017een\u00ed<\/td><td>\u226520% (tlou\u0161\u0165ka \u226416 mm)<\/td><\/tr><tr><td>Fosfor (P)<\/td><td>\u22640,035%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Vzhledem k n\u00edzk\u00e9mu obsahu uhl\u00edku nen\u00ed Q390B vhodn\u00fd pro kalen\u00ed a popou\u0161t\u011bn\u00ed. P\u0159esto se vyzna\u010duje vynikaj\u00edc\u00ed odolnost\u00ed proti opot\u0159eben\u00ed a st\u0159edn\u00ed odolnost\u00ed proti korozi a je schopen odol\u00e1vat erozi zp\u016fsoben\u00e9 atmosf\u00e9rick\u00fdmi podm\u00ednkami a ur\u010dit\u00fdmi chemick\u00fdmi l\u00e1tkami.<\/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>Q420B je ocel s ultra vysokou pevnost\u00ed. Podle <em>Anal\u00fdza stavu rozvoje a popt\u00e1vky po oceli v \u010d\u00ednsk\u00e9m pr\u016fmyslu ocelov\u00fdch konstrukc\u00ed<\/em>Ocel Q420B tvo\u0159\u00ed v\u00edce ne\u017e 50% vysokopevnostn\u00ed oceli a pou\u017e\u00edv\u00e1 se p\u0159ev\u00e1\u017en\u011b v ocelov\u00fdch konstrukc\u00edch pro stavebnictv\u00ed, mosty nebo t\u011b\u017ek\u00e1 za\u0159\u00edzen\u00ed, jako jsou hlavn\u00ed nosn\u00edky port\u00e1lov\u00fdch je\u0159\u00e1b\u016f o nosnosti 50\u2013300 tun nebo p\u0159\u00edstavn\u00ed stroje.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Chemick\u00e9 slo\u017een\u00ed <\/th><th>Sk\u00f3re kvality<\/th><th>Mechanick\u00e9 vlastnosti<\/th><th>Parametry<\/th><\/tr><\/thead><tbody><tr><td>Uhl\u00edk (C)<\/td><td>\u22640,2%<\/td><td>Mez kluzu<\/td><td>\u2265420 MPa<\/td><\/tr><tr><td>K\u0159em\u00edk (Si)<\/td><td>\u22640,55%<\/td><td>Pevnost v tahu<\/td><td>520\u2013680 MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>\u22641,7%<\/td><td>R\u00e1zov\u00e1 hou\u017eevnatost<\/td><td>\u226534 J (n\u00e1razov\u00e1 zkou\u0161ka p\u0159i 20 \u00b0C)<\/td><\/tr><tr><td>S\u00edra (S)<\/td><td>\u22640,035%<\/td><td>Procentn\u00ed prodlou\u017een\u00ed<\/td><td>\u226518% (tlou\u0161\u0165ka \u226416 mm)<\/td><\/tr><tr><td>Fosfor (P)<\/td><td>\u22640,035%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Pokud se v\u0161ak tlou\u0161\u0165ka ocelov\u00fdch plech\u016f Q420B zv\u011bt\u0161\u00ed, jejich mez kluzu se postupn\u011b sni\u017euje. Nap\u0159\u00edklad p\u0159i tlou\u0161\u0165ce \u2264 16 mm je mez kluzu \u2265 420 MPa, ale p\u0159i tlou\u0161\u0165ce &gt; 50 mm je mez kluzu pouze \u2265 360 MPa. Proto je u aplikac\u00ed s ultratlust\u00fdm plechem nutn\u00e9 optimalizovat proces nebo zvolit ocel vy\u0161\u0161\u00ed jakosti, aby byly spln\u011bny po\u017eadavky na pevnost, a n\u00e1klady se odpov\u00eddaj\u00edc\u00edm zp\u016fsobem zv\u00fd\u0161\u00ed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"special-steel-choice-for-extreme-conditions\">Speci\u00e1ln\u00ed ocel: Volba pro mostov\u00e9 a port\u00e1lov\u00e9 je\u0159\u00e1by pou\u017e\u00edvan\u00e9 v extr\u00e9mn\u00edch podm\u00ednk\u00e1ch<\/h2>\n\n\n\n<p>Speci\u00e1ln\u00ed ocel je zak\u00e1zkov\u00fd materi\u00e1l pro hlavn\u00ed nosn\u00edk mostov\u00fdch a port\u00e1lov\u00fdch je\u0159\u00e1b\u016f v extr\u00e9mn\u00edch provozn\u00edch podm\u00ednk\u00e1ch. Li\u0161\u00ed se od n\u00edzkouhl\u00edkov\u00e9 oceli a vysokopevnostn\u00ed n\u00edzkolegovan\u00e9 oceli. D\u00edky p\u0159esn\u00e9mu pom\u011bru legov\u00e1n\u00ed a optimalizaci procesu p\u0159ekon\u00e1v\u00e1 nedostatky konven\u010dn\u00ed oceli ve v\u00fdkonnosti v situac\u00edch, jako je extr\u00e9mn\u00ed chlad, vysok\u00e1 soln\u00e1 mlha, siln\u00e1 koroze, extr\u00e9mn\u011b vysok\u00e1 nosnost a vysokofrekven\u010dn\u00ed nep\u0159etr\u017eit\u00fd provoz, a st\u00e1v\u00e1 se z\u00e1kladn\u00ed oporou pro bezpe\u010dnost za\u0159\u00edzen\u00ed a dlouhodob\u00fd provoz v n\u00e1ro\u010dn\u00fdch podm\u00ednk\u00e1ch.<\/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 T\u0159. 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>Q460NE je korozivzdorn\u00e1 n\u00edzkolegovan\u00e1 ocel speci\u00e1ln\u011b navr\u017een\u00e1 pro n\u00e1ro\u010dn\u00e9 pracovn\u00ed podm\u00ednky. P\u00edsmeno \u201eN\u201c v ozna\u010den\u00ed jakosti ozna\u010duje odolnost v\u016f\u010di pov\u011btrnostn\u00edm vliv\u016fm, zat\u00edmco \u201eE\u201c odpov\u00edd\u00e1 r\u00e1zov\u00e9 pevnosti p\u0159i n\u00edzk\u00fdch teplot\u00e1ch -40 \u00b0C. Ve srovn\u00e1n\u00ed s b\u011b\u017enou ocel\u00ed spl\u0148uje pevnostn\u00ed po\u017eadavky t\u011b\u017ek\u00fdch konstrukc\u00ed a m\u016f\u017ee stabiln\u011b fungovat po del\u0161\u00ed dobu v extr\u00e9mn\u011b chladn\u00e9m prost\u0159ed\u00ed s vysokou vlhkost\u00ed a solnou mlhou. Jej\u00ed kl\u00ed\u010dov\u00e9 v\u00fdkonnostn\u00ed parametry jsou n\u00e1sleduj\u00edc\u00ed:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Chemick\u00e9 slo\u017een\u00ed <\/th><th>Sk\u00f3re kvality<\/th><th>Mechanick\u00e9 vlastnosti<\/th><th>Parametry<\/th><\/tr><\/thead><tbody><tr><td>Uhl\u00edk (C)<\/td><td>\u22640,18%<\/td><td>Mez kluzu<\/td><td>\u2265460 MPa<\/td><\/tr><tr><td>K\u0159em\u00edk (Si)<\/td><td>\u22640,55%<\/td><td>Pevnost v tahu<\/td><td>540\u2013720 MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>1.0%-1.6%<\/td><td>R\u00e1zov\u00e1 hou\u017eevnatost<\/td><td>\u226520 J (n\u00e1razov\u00e1 zkou\u0161ka p\u0159i -40 \u2103)<\/td><\/tr><tr><td>S\u00edra (S)<\/td><td>\u22640,02%<\/td><td>Procentn\u00ed prodlou\u017een\u00ed<\/td><td>\u226517% (tlou\u0161\u0165ka \u226416 mm)<\/td><\/tr><tr><td>Fosfor (P)<\/td><td>\u22640,025%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Pro dosa\u017een\u00ed dvoj\u00edho zlep\u0161en\u00ed odolnosti proti pov\u011btrnostn\u00edm vliv\u016fm a v\u00fdkonu p\u0159i n\u00edzk\u00fdch teplot\u00e1ch jsou do slo\u017een\u00ed Q460NE p\u0159id\u00e1ny specifick\u00e9 leguj\u00edc\u00ed prvky. Obsah a funkce ka\u017ed\u00e9ho prvku jsou n\u00e1sleduj\u00edc\u00ed:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Slitinov\u00e9 prvky<\/th><th>Horn\u00ed limit obsahu<\/th><th>Hlavn\u00ed funkce<\/th><\/tr><\/thead><tbody><tr><td>Chrom (Cr)<\/td><td>\u22640,30%<\/td><td>Zlep\u0161it odolnost proti korozi a pos\u00edlit stabilitu tk\u00e1n\u00ed<\/td><\/tr><tr><td>Nikl (Ni)<\/td><td>\u22640,80%<\/td><td>V\u00fdrazn\u011b zlep\u0161uje hou\u017eevnatost za n\u00edzk\u00fdch teplot a sni\u017euje teplotu p\u0159echodu z tv\u00e1rn\u00e9 do k\u0159ehk\u00e9 f\u00e1ze<\/td><\/tr><tr><td>M\u011b\u010f (Cu)<\/td><td>\u22640,40%<\/td><td>Zlep\u0161en\u00ed odolnosti proti atmosf\u00e9rick\u00e9 korozi<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Stru\u010dn\u011b \u0159e\u010deno, d\u00edky n\u00edzkouhl\u00edkov\u00e9 konstrukci a synergick\u00e9mu efektu leguj\u00edc\u00edch prvk\u016f, jako jsou Cr, Ni a Cu, m\u016f\u017ee Q460NE spl\u0148ovat mechanick\u00e9 po\u017eadavky a po\u017eadavky na odolnost v prost\u0159ed\u00ed s vysokou vlhkost\u00ed a vysok\u00fdm obsahem soli. I p\u0159i extr\u00e9mn\u011b n\u00edzk\u00fdch teplot\u00e1ch -40 \u00b0C si Q460NE zachov\u00e1v\u00e1 dobrou r\u00e1zovou hou\u017eevnatost a \u00fa\u010dinn\u011b zabra\u0148uje k\u0159ehnut\u00ed materi\u00e1lu zp\u016fsoben\u00e9mu n\u00edzk\u00fdmi teplotami. To poskytuje pevnou bezpe\u010dnostn\u00ed bari\u00e9ru pro in\u017een\u00fdrsk\u00e9 konstrukce v extr\u00e9mn\u011b chladn\u00fdch oblastech a zvy\u0161uje spolehlivost za\u0159\u00edzen\u00ed a provozn\u00ed \u00fa\u010dinnost.<\/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>Q355NH je ocelov\u00fd plech odoln\u00fd v\u016f\u010di atmosf\u00e9rick\u00e9 korozi, zn\u00e1m\u00fd tak\u00e9 jako ocel odoln\u00e1 v\u016f\u010di pov\u011btrnostn\u00edm vliv\u016fm. Modifik\u00e1tory \u201eN\u201c a \u201eH\u201c obvykle p\u0159edstavuj\u00ed po\u017eadavky na normalizaci a zlep\u0161en\u00ed n\u00edzkoteplotn\u00ed hou\u017eevnatosti. Normalizace (udr\u017eov\u00e1n\u00ed nad teplotou f\u00e1zov\u00e9 transformace n\u00e1sledovan\u00e9 ochlazov\u00e1n\u00edm na vzduchu) m\u016f\u017ee zjemnit zrna, vytvo\u0159it jemn\u011bj\u0161\u00ed feriticko-perlitovou strukturu a dos\u00e1hnout rovnom\u011brn\u011bj\u0161\u00edch vlastnost\u00ed ve sm\u011bru tlou\u0161\u0165ky.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Chemick\u00e9 slo\u017een\u00ed <\/th><th>Sk\u00f3re kvality<\/th><th>Mechanick\u00e9 vlastnosti<\/th><th>Parametry<\/th><\/tr><\/thead><tbody><tr><td>Uhl\u00edk (C)<\/td><td>\u22640,16%<\/td><td>Mez kluzu<\/td><td>\u2265355 MPa<\/td><\/tr><tr><td>K\u0159em\u00edk (Si)<\/td><td>\u22640,5%<\/td><td>Pevnost v tahu<\/td><td>490\u2013630 MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>0.5%-1.5%<\/td><td>R\u00e1zov\u00e1 hou\u017eevnatost<\/td><td>\u226534 J (n\u00e1razov\u00e1 zkou\u0161ka p\u0159i -40 \u2103)<\/td><\/tr><tr><td>S\u00edra (S)<\/td><td>\u22640,03%<\/td><td>Procentn\u00ed prodlou\u017een\u00ed<\/td><td>\u226517% (tlou\u0161\u0165ka \u226416 mm)<\/td><\/tr><tr><td>Fosfor (P)<\/td><td>\u22640,03%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Ve srovn\u00e1n\u00ed s n\u00edzkouhl\u00edkovou ocel\u00ed dosahuje Q355NH 2\u20138n\u00e1sobn\u00e9ho zlep\u0161en\u00ed odolnosti v\u016f\u010di pov\u011btrnostn\u00edm vliv\u016fm, a to p\u0159edev\u0161\u00edm d\u00edky p\u0159id\u00e1n\u00ed specifick\u00fdch leguj\u00edc\u00edch prvk\u016f do sv\u00e9ho slo\u017een\u00ed.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Slitinov\u00e9 prvky<\/th><th>Horn\u00ed limit obsahu<\/th><th>Hlavn\u00ed funkce<\/th><\/tr><\/thead><tbody><tr><td>Chrom (Cr)<\/td><td>0.4%-0.8%<\/td><td>Zlep\u0161it odolnost proti korozi a pos\u00edlit stabilitu tk\u00e1n\u00ed<\/td><\/tr><tr><td>Nikl (Ni)<\/td><td>\u22640,65%<\/td><td>V\u00fdrazn\u011b zlep\u0161uje hou\u017eevnatost za n\u00edzk\u00fdch teplot a sni\u017euje teplotu p\u0159echodu z tv\u00e1rn\u00e9 do k\u0159ehk\u00e9 f\u00e1ze<\/td><\/tr><tr><td>M\u011b\u010f (Cu)<\/td><td>0.25%-0.55%<\/td><td>Zlep\u0161en\u00ed odolnosti proti atmosf\u00e9rick\u00e9 korozi<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Je vid\u011bt, \u017ee Q355NH si zachov\u00e1v\u00e1 pevnost, hou\u017eevnatost a sva\u0159itelnost b\u011b\u017en\u00e9 konstruk\u010dn\u00ed oceli a z\u00e1rove\u0148 m\u00e1 ta\u017enost, odolnost proti korozi, odolnost v\u016f\u010di vysok\u00fdm teplot\u00e1m a \u00fanavovou odolnost vysoce kvalitn\u00ed oceli. Nav\u00edc je Q355NH 1,5\u201310kr\u00e1t nat\u00edrateln\u00e1 oproti b\u011b\u017en\u00e9 uhl\u00edkov\u00e9 oceli. Eliminuje tak pot\u0159ebu \u010dast\u00e9ho nat\u00edr\u00e1n\u00ed a \u00fadr\u017eby, co\u017e \u00fa\u010dinn\u011b sni\u017euje celkov\u00e9 n\u00e1klady na \u017eivotn\u00ed cyklus venkovn\u00edch je\u0159\u00e1b\u016f. Jej\u00ed odolnost proti korozi a korozi prodlu\u017euje \u017eivotnost sou\u010d\u00e1st\u00ed a sni\u017euje spot\u0159ebu materi\u00e1lu, co\u017e z n\u00ed \u010din\u00ed preferovanou ocel pro konstruk\u010dn\u00ed komponenty je\u0159\u00e1b\u016f ve slo\u017eit\u00fdch pracovn\u00edch podm\u00ednk\u00e1ch, jako je venkovn\u00ed a pob\u0159e\u017en\u00ed prost\u0159ed\u00ed.<\/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 T\u0159\u00edda 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>Q450NQR1 je vysokopevnostn\u00ed ocel odoln\u00e1 v\u016f\u010di pov\u011btrnostn\u00edm vliv\u016fm, kter\u00e1 sni\u017euje svou hmotnost a vyzna\u010duje se vynikaj\u00edc\u00ed r\u00e1zovou hou\u017eevnatost\u00ed za n\u00edzk\u00fdch teplot a odolnost\u00ed proti atmosf\u00e9rick\u00e9 korozi, d\u00edky \u010demu\u017e je vhodn\u00e1 pro pou\u017eit\u00ed v r\u016fzn\u00fdch extr\u00e9mn\u00edch klimatick\u00fdch podm\u00ednk\u00e1ch. NQR p\u0159edstavuje ocel odolnou v\u016f\u010di atmosf\u00e9rick\u00e9 korozi (pov\u011btrnostn\u00edm vliv\u016fm), co\u017e je vysokopevnostn\u00ed n\u00edzkolegovan\u00e1 ocel speci\u00e1ln\u011b navr\u017een\u00e1 pro venkovn\u00ed, pob\u0159e\u017en\u00ed a jin\u00e1 korozivn\u00ed prost\u0159ed\u00ed; 1 je \u010d\u00edslo jakostn\u00ed \u0159ady, kter\u00e9 p\u0159edstavuje specifick\u00fd pom\u011br legov\u00e1n\u00ed a \u00farove\u0148 v\u00fdkonu.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Chemick\u00e9 slo\u017een\u00ed <\/th><th>Sk\u00f3re kvality<\/th><th>Mechanick\u00e9 vlastnosti<\/th><th>Parametry<\/th><\/tr><\/thead><tbody><tr><td>Uhl\u00edk (C)<\/td><td>\u22640,12%<\/td><td>Mez kluzu<\/td><td>\u2265450 MPa<\/td><\/tr><tr><td>K\u0159em\u00edk (Si)<\/td><td>\u22640,75%<\/td><td>Pevnost v tahu<\/td><td>\u2265550 MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>\u22641,5%<\/td><td>R\u00e1zov\u00e1 hou\u017eevnatost<\/td><td>\u226560 J (n\u00e1razov\u00e1 zkou\u0161ka p\u0159i -40 \u2103)<\/td><\/tr><tr><td>S\u00edra (S)<\/td><td>\u22640,008%<\/td><td>Procentn\u00ed prodlou\u017een\u00ed<\/td><td>\u226520% (tlou\u0161\u0165ka \u226414 mm)<\/td><\/tr><tr><td>Fosfor (P)<\/td><td>\u22640,025%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Jak je patrn\u00e9 z v\u00fd\u0161e uveden\u00fdch z\u00e1kladn\u00edch vlastnost\u00ed, Q450NQR1 dosahuje troj\u00ed v\u00fdhody: vysok\u00e9 pevnosti, odolnosti v\u016f\u010di pov\u011btrnostn\u00edm vliv\u016fm a hou\u017eevnatosti za n\u00edzk\u00fdch teplot, co\u017e vypl\u00fdv\u00e1 z p\u0159esn\u00e9ho pom\u011bru jeho leguj\u00edc\u00edch prvk\u016f.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Slitinov\u00e9 prvky<\/th><th>Horn\u00ed limit obsahu<\/th><th>Hlavn\u00ed funkce<\/th><\/tr><\/thead><tbody><tr><td>Chrom (Cr)<\/td><td>0.3%-1.25%<\/td><td>Zlep\u0161it odolnost proti korozi a pos\u00edlit stabilitu tk\u00e1n\u00ed<\/td><\/tr><tr><td>Nikl (Ni)<\/td><td>0.125-0.65%<\/td><td>V\u00fdrazn\u011b zlep\u0161uje hou\u017eevnatost za n\u00edzk\u00fdch teplot a sni\u017euje teplotu p\u0159echodu z tv\u00e1rn\u00e9 do k\u0159ehk\u00e9 f\u00e1ze<\/td><\/tr><tr><td>M\u011b\u010f (Cu)<\/td><td>0.25%-0.55%<\/td><td>Zlep\u0161en\u00ed odolnosti proti atmosf\u00e9rick\u00e9 korozi<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>D\u00edky n\u00edzk\u00e9mu obsahu uhl\u00edku a extr\u00e9mn\u011b n\u00edzk\u00e9mu obsahu s\u00edry v kombinaci se synergick\u00fdm efektem leguj\u00edc\u00edch prvk\u016f Cr, Ni a Cu m\u00e1 Q450NQR1 vynikaj\u00edc\u00ed komplexn\u00ed v\u00fdkon, kter\u00fd spl\u0148uje po\u017eadavky norem pr\u016fmyslu pro pov\u011btrnostn\u011b odolnou ocel. Dosahuje rovnov\u00e1hy mezi vysokou pevnost\u00ed, odolnost\u00ed proti pov\u011btrnostn\u00edm vliv\u016fm a hou\u017eevnatost\u00ed za n\u00edzk\u00fdch teplot, co\u017e z n\u011bj \u010din\u00ed ide\u00e1ln\u00ed materi\u00e1l pro je\u0159\u00e1by v n\u00e1ro\u010dn\u00fdch provozn\u00edch podm\u00ednk\u00e1ch, jako jsou p\u0159\u00edstavy a otev\u0159en\u00e9 skladovac\u00ed dvory.<\/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 je vysoce pevn\u00fd materi\u00e1l. D\u00edky laserov\u00e9mu sva\u0159ov\u00e1n\u00ed a proces\u016fm odstra\u0148ov\u00e1n\u00ed pnut\u00ed lze jeho hmotnost sn\u00ed\u017eit o 151 t\/100 kg, jeho nosnost zv\u00fd\u0161it o 251 t\/100 kg a jeho \u00fanavov\u00e1 \u017eivotnost prodlou\u017eit o 371 t\/100 kg ve srovn\u00e1n\u00ed s pr\u016fm\u011brem v oboru. Spl\u0148uje \u00farove\u0148 t\u011b\u017ek\u00fdch provozn\u00edch podm\u00ednek A7 a je vhodn\u00fd pro velkoton\u00e1\u017en\u00ed, vysoce v\u00fdkonn\u00e9 speci\u00e1ln\u00ed je\u0159\u00e1by, jako jsou 300tunov\u00e9 p\u00e1nvov\u00e9 je\u0159\u00e1by v hutnictv\u00ed a 200tunov\u00e9 je\u0159\u00e1by pro zved\u00e1n\u00ed trupov\u00fdch sekc\u00ed v lodn\u00edm pr\u016fmyslu. Jeho hlavn\u00ed komponenty a mechanick\u00e9 vlastnosti jsou n\u00e1sleduj\u00edc\u00ed:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Chemick\u00e9 slo\u017een\u00ed <\/th><th>Sk\u00f3re kvality<\/th><th>Mechanick\u00e9 vlastnosti<\/th><th>Parametry<\/th><\/tr><\/thead><tbody><tr><td>Uhl\u00edk (C)<\/td><td>\u22640,18%<\/td><td>Mez kluzu<\/td><td>\u2265690 MPa<\/td><\/tr><tr><td>K\u0159em\u00edk (Si)<\/td><td>\u22640,6%<\/td><td>Pevnost v tahu<\/td><td>770\u2013940 MPa<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>\u22642,0%<\/td><td>R\u00e1zov\u00e1 hou\u017eevnatost<\/td><td>\u226534 J (n\u00e1razov\u00e1 zkou\u0161ka p\u0159i -20 \u2103)<\/td><\/tr><tr><td>S\u00edra (S)<\/td><td>\u22640,025%<\/td><td>Procentn\u00ed prodlou\u017een\u00ed<\/td><td>\u226514% (tlou\u0161\u0165ka \u226416 mm)<\/td><\/tr><tr><td>Fosfor (P)<\/td><td>\u22640,03%<\/td><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Z\u00e1rove\u0148 pro dosa\u017een\u00ed dvoj\u00edho c\u00edle \u2013 n\u00edzk\u00e9 hmotnosti a vysok\u00e9 pevnosti \u2013 optimalizuje Q690E svou mikrostrukturu a vlastnosti p\u0159id\u00e1n\u00edm specifick\u00fdch leguj\u00edc\u00edch prvk\u016f. Obsah a funkce ka\u017ed\u00e9ho kl\u00ed\u010dov\u00e9ho prvku jsou n\u00e1sleduj\u00edc\u00ed:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Slitinov\u00e9 prvky<\/th><th>Horn\u00ed limit obsahu<\/th><th>Hlavn\u00ed funkce<\/th><\/tr><\/thead><tbody><tr><td>Chrom (Cr)<\/td><td>\u22641,0%<\/td><td>Zlep\u0161it odolnost proti korozi a pos\u00edlit stabilitu tk\u00e1n\u00ed<\/td><\/tr><tr><td>Nikl (Ni)<\/td><td>\u22640,8%<\/td><td>V\u00fdrazn\u011b zlep\u0161uje hou\u017eevnatost za n\u00edzk\u00fdch teplot a sni\u017euje teplotu p\u0159echodu z tv\u00e1rn\u00e9 do k\u0159ehk\u00e9 f\u00e1ze<\/td><\/tr><tr><td>M\u011b\u010f (Cu)<\/td><td>\u22640,5%<\/td><td>Zlep\u0161en\u00ed odolnosti proti atmosf\u00e9rick\u00e9 korozi<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Proto m\u00e1 Q690E extr\u00e9mn\u011b vysokou \u00fanosnost, co\u017e m\u016f\u017ee zv\u00fd\u0161it horn\u00ed hranici zat\u00ed\u017een\u00ed a z\u00e1rove\u0148 zmen\u0161it pr\u016f\u0159ez hlavn\u00edho nosn\u00edku; m\u00e1 tak\u00e9 vynikaj\u00edc\u00ed n\u00edzkoteplotn\u00ed hou\u017eevnatost a dobrou odolnost proti \u00fanav\u011b, d\u00edky \u010demu\u017e je vhodn\u00fd pro vysokofrekven\u010dn\u00ed a nep\u0159etr\u017eit\u00fd provoz s vysok\u00fdm zat\u00ed\u017een\u00edm, ale n\u00e1klady jsou relativn\u011b vysok\u00e9 a lze jej volit podle skute\u010dn\u00fdch po\u017eadavk\u016f na \u00fanosnost.<\/p>\n\n\n\n<p>S v\u00edce ne\u017e 20 lety zku\u0161enost\u00ed s materi\u00e1ly pro ocelov\u00e9 konstrukce je\u0159\u00e1b\u016f, <strong>DGCRANE<\/strong> hluboce si uv\u011bdomuje, \u017ee ka\u017ed\u00fd detail v\u00fdb\u011bru materi\u00e1lu p\u0159\u00edmo ur\u010duje bezpe\u010dnostn\u00ed faktor za\u0159\u00edzen\u00ed, \u017eivotnost a n\u00e1klady na cel\u00fd cyklus za r\u016fzn\u00fdch nosnost\u00ed, pracovn\u00edch t\u0159\u00edd a provozn\u00edch prost\u0159ed\u00ed. <strong>DGCRANE<\/strong> dok\u00e1\u017eeme p\u0159esn\u011b dodat kompletn\u00ed sortiment mezin\u00e1rodn\u00edch standardn\u00edch ocel\u00ed, v\u010detn\u011b Q355B, Q460NE a Q690E, p\u0159izp\u016fsoben\u00fdch va\u0161im skute\u010dn\u00fdm pracovn\u00edm podm\u00ednk\u00e1m, jako je extr\u00e9mn\u00ed chlad, vysok\u00e1 soln\u00e1 mlha a nep\u0159etr\u017eit\u00fd t\u011b\u017ek\u00fd provoz, a pln\u011b spl\u0148ovat po\u017eadavky na materi\u00e1l pro konven\u010dn\u00ed i speci\u00e1ln\u00ed sc\u00e9n\u00e1\u0159e.<\/p>\n\n\n\n<p><strong>DGCRANE<\/strong> Poskytneme komplexn\u00ed \u0159e\u0161en\u00ed pro cel\u00fd proces, v\u010detn\u011b konzultac\u00ed ohledn\u011b materi\u00e1l\u016f na m\u00edru, \u0159ez\u00e1n\u00ed na m\u00edru, sva\u0159ov\u00e1n\u00ed a antikorozn\u00ed p\u0159ed\u00fapravy, stejn\u011b jako plnou sledovatelnost kvality a z\u00e1ru\u010dn\u00ed podporu. Pom\u016f\u017eeme v\u00e1m vyhnout se rizik\u016fm p\u0159i v\u00fdb\u011bru od zdroje, co\u017e umo\u017en\u00ed bezpe\u010dn\u011bj\u0161\u00ed provoz je\u0159\u00e1bu, odoln\u011bj\u0161\u00ed konstrukce a l\u00e9pe kontrolovan\u00e9 celkov\u00e9 n\u00e1klady.<\/p>","protected":false},"excerpt":{"rendered":"Hlavn\u00ed nosn\u00edk, jako\u017eto prim\u00e1rn\u00ed nosn\u00e1 konstrukce je\u0159\u00e1bu, \u010dasto tvo\u0159\u00ed v\u00fdznamnou \u010d\u00e1st jeho hmotnosti. Hlavn\u00ed nosn\u00edk mostov\u00e9ho je\u0159\u00e1bu p\u0159edstavuje 40%-60% celkov\u00e9 hmotnosti je\u0159\u00e1bu, zat\u00edmco hlavn\u00ed nosn\u00edk port\u00e1lov\u00e9ho je\u0159\u00e1bu p\u0159esahuje 30%. Ocelov\u00fd materi\u00e1l hlavn\u00edho nosn\u00edku p\u0159\u00edmo ur\u010duje celkovou nosnost, provozn\u00ed bezpe\u010dnost a [\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\/cs\/wp-json\/wp\/v2\/xmxposts\/16938"}],"collection":[{"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/xmxposts"}],"about":[{"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/types\/posts"}],"version-history":[{"count":10,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/xmxposts\/16938\/revisions"}],"predecessor-version":[{"id":16959,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/xmxposts\/16938\/revisions\/16959"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/media\/16939"}],"wp:attachment":[{"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/media?parent=16938"}],"wp:term":[{"taxonomy":"posts_category","embeddable":true,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/posts_category?post=16938"},{"taxonomy":"posts_tag","embeddable":true,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/posts_tag?post=16938"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}