High-tensile steel plate having excellent low-temperature toughness

The high-tensile steel plate contains, in terms of mass%, 0.08%-0.15% C, 0.80%-1.60% Mn, 3.00%-4.50% Ni, 0.50%-1.00% Cr, 0.50%-1.00% Mo, 0.020%-0.085% Al, 0.0020%-0.0070% N, and 0.0005%-0.0020% B, theplate thickness tmm being more than 200 mm and no more than 300 mm, the plate having a chemical comp...

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Bibliographische Detailangaben
Hauptverfasser:	KAWABATA NORIMASA, SAITOH NAOKI, TAKAMINE FUMITOSHI, NAMBA TOSHIAKI, SAWAMURA MITSURU
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The high-tensile steel plate contains, in terms of mass%, 0.08%-0.15% C, 0.80%-1.60% Mn, 3.00%-4.50% Ni, 0.50%-1.00% Cr, 0.50%-1.00% Mo, 0.020%-0.085% Al, 0.0020%-0.0070% N, and 0.0005%-0.0020% B, theplate thickness tmm being more than 200 mm and no more than 300 mm, the plate having a chemical composition in which Ts is 380-430, Ceq is 0.80-1.05, Ac1 is 580-647, and x is 46-90, the combined total amount of martensite and bainite in terms of vol% being 99%-100%, the plate having a tensile strength of 780 MPa-930 MPa, and the absorbed energy in a Charpy impact test at -60 degree centigrade ofa center part of the plate thickness being at least 69 J. 该高强度钢板，按质量％计，含有C：0.08％～0.15％、Mn：0.80％～1.60％、Ni：3.00％～4.50％、Cr：0.50％～1.00％、Mo：0.50％～1.00％、Al：0.020％～0.085％、N：0.0020％～0.0070％、B：0.0005％～0.0020％，板厚tmm超过200mm且为300mm以下，所述化学组成中，Ts为380～430，Ceq为0.80～1.05，Ac1为580～647，x为46～90，按面积％计，马氏体和贝氏体的合计量为99％～100％，抗拉强度为780MPa～930MPa，板厚中心部在-60℃的夏比冲击试验得到的吸收能为69J以上。