公开(公告)号：WO2019180563A1

公开(公告)日：2019-09-26

申请号：PCT/IB2019/052125

申请日：2019-03-15

申请人： ARCELORMITTAL

发明人： BORDEREAU, Victor

IPC分类号： C21D7/13 ,  C21D1/19 ,  C21D1/20 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

摘要： A steel for forging mechanical parts comprising of the following elements, expressed in percentage by weight: 0.15% ≦C≦ 0.22%; 1.6% ≦Mn≦ 2.2%; 0.6% ≦Si≦ 1%; 1% ≦Cr≦ 1.5%; 0.01%≦Ni≦ 1%; 0% ≦S≦ 0.06%; 0% ≦P≦ 0.02%; 0% ≦N≦ 0.013%; and having optional elements 0% ≦Al≦ 0.06%; 0.03% ≦Mo≦ 0.1%; 0% ≦Cu≦ 0.5%; 0.01% ≦Nb≦ 0.15%; 0.01% ≦Ti≦ 0.03%; 0% ≦V≦ 0.08%; 0.0015% ≦B≦ 0.004%; the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel having microstructure by area percentage comprising of cumulative presence of residual austenite and martensite-austenite island between 1 % and 20%, the remaining microstructure being bainite having at least 80%, wherein the fraction of grain boundaries of bainite with a misorientation angle of 59.5° are at least 7% and with an optional presence of martensite between 0% and 10%.

公开(公告)号：WO2021099815A1

公开(公告)日：2021-05-27

申请号：PCT/IB2019/059868

申请日：2019-11-18

申请人： ARCELORMITTAL

发明人： BORDEREAU, Victor ,  PERSEM, Caroline ,  LHUILLERY, Mathieu

IPC分类号： C22C38/60 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/06 ,  C21D9/30 ,  C21D6/00 ,  C21D6/02

摘要： A steel for forging mechanical parts comprising of the following elements, expressed in percentage by weight 0.2% ≦ C ≦ 0.5 %; 0.8% ≦ Mn ≦1.5 %; 0.4% ≦ Si ≦ 1 %; 0.15% ≦ V≦ 0.6%; 0.01% ≦ Nb ≦ 0.15%; 0.01% ≦ Cr ≦ 0.5 %; 0.01% ≦ P ≦ 0.05%; 0.04% ≦ S ≦ 0.09%; 0.01% ≦ N ≦ 0.025%; and can contain one or more of the following optional elements 0 % ≦ Al ≦ 0.05 %; 0% ≦ Mo ≦ 0.5%; 0.01% ≦ Ni ≦ 0.5%; 0% ≦ Ti ≦ 0.2%; 0% ≦ B ≦ 0.008%; 0% ≦ Cu ≦ 0.5%; the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel comprising 50% to 90% of Pearlite, 10% to 40% of Ferrite, with an optional presence of acicular ferrite between 0% and 2%, a niobium equivalent of 80% or more.

公开(公告)号：WO2019180492A1

公开(公告)日：2019-09-26

申请号：PCT/IB2018/051970

申请日：2018-03-23

申请人： ARCELORMITTAL

发明人： BORDEREAU, Victor

IPC分类号： C21D7/13 ,  C21D1/19 ,  C21D1/20 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

摘要： A steel for forging mechanical parts comprising of the following elements, expressed in percentage by weight: 0.15% ≦C≦ 0.22%; 1.6% ≦Mn≦ 2.2%; 0.6% ≦Si≦ 1%; 1% ≦Cr≦ 1.5%; 0.01%≦Ni≦ 1%; 0% ≦S≦ 0.06%; 0% ≦P≦ 0.02%; 0% ≦N≦ 0.013%; and having optional elements 0% ≦Al≦ 0.06%; 0.03% ≦Mo≦ 0.1%; 0% ≦Cu≦ 0.5%; 0.01% ≦Nb≦ 0.15%; 0.01% ≦Ti≦ 0.03%; 0% ≦V≦ 0.08%; 0.0015% ≦B≦ 0.004%; the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel having microstructure by area percentage comprising of cumulative presence of residual austenite and martensite-austenite island between 1 % and 20%, the remaining microstructure being bainite having at least 80%, wherein the fraction of grain boundaries of bainite with a misorientation angle of 59.5° are at least 7% and with an optional presence of martensite between 0% and 10%.