公开(公告)号：EP2576848B1

公开(公告)日：2016-12-07

申请号：EP11743330.0

申请日：2011-06-07

申请人： Rautaruukki OYJ

发明人： VIMPARI, Jarkko ,  LIIMATAINEN, Tommi ,  HEMMILÄ, Mikko ,  HIRVI, Ari ,  SAVOLA, Jaakko ,  KUOPPALA, Juha ,  TIHINEN, Sakari ,  TAMMINEN, Päivi ,  PELTONEN, Teemu

IPC分类号： C21D1/25 ,  C21D8/02 ,  C21D8/04

CPC分类号： C21D8/0226 ,  C21D1/25 ,  C21D8/0263 ,  C21D8/0426 ,  C21D8/0463 ,  C21D2211/008

公开(公告)号：EP2576848A1

公开(公告)日：2013-04-10

申请号：EP11743330.0

申请日：2011-06-07

申请人： Rautaruukki OYJ

发明人： VIMPARI, Jarkko ,  LIIMATAINEN, Tommi ,  HEMMILÄ, Mikko ,  HIRVI, Ari ,  SAVOLA, Jaakko ,  KUOPPALA, Juha ,  TIHINEN, Sakari ,  TAMMINEN, Päivi ,  PELTONEN, Teemu

IPC分类号： C21D1/25 ,  C21D8/02 ,  C21D8/04

CPC分类号： C21D8/0226 ,  C21D1/25 ,  C21D8/0263 ,  C21D8/0426 ,  C21D8/0463 ,  C21D2211/008

摘要： The invention relates to a method for producing a hot-rolled steel from a steel, whose composition as percentages by weight is C 0.075 - 0.12% Si 0.1 - 0.8% Mn 0.8 - 1.7% Al 0.015 - 0.08% P less than 0.012% s less than 0.005% Cr 0.2 - 1.3% Mo 0.15 - 0.80% Ti 0.01 - 0.05% B 0.0005 - 0.003% V 0.02 - 0.10% Nb less than 0.3% Ni less than 1% Cu less than 0.5% the rest being iron and unavoidable impurities. The invention relates in particular to direct quenched martensitic sheet-like steels, on which temper annealing is conducted, i.e. tempering steels and their production. The hot-rolled steel according to the invention is exceptionally temper-resistant after the direct quenching process, wherein by tempering it is made further high-strength (Rp0.2≥890MPa) combined at the same time with good impact toughness (Charpy V (-20°C) ≥37J/cm
2 ) and flangeability as well as good weldability.