公开(公告)号：US10131964B2

公开(公告)日：2018-11-20

申请号：US14672906

申请日：2015-03-30

申请人： ARCELORMITTAL FRANCE ,  THYSSENKRUPP STEEL EUROPE AG

发明人： Colin Scott ,  Philippe Cugy ,  Christian Allely

IPC分类号： C22C38/02 ,  C21D9/46 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C28/02 ,  C21D1/26 ,  C21D1/42 ,  C21D1/767 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/06 ,  B32B15/01

摘要： An austenitic steel sheet excellent in resistance to delayed cracking is provided. The composition of said steel comprises in weight: 0.35%≤C≤1.05% 15%≤Mn≤26% Si≤3% Al≤0.050% S≤0.030% P≤0.080% N≤0.1%, at least one metallic element X chosen among vanadium, titanium, niobium, molybdenum, chromium 0.050%≤V≤0.50%, 0.040%≤Ti≤0.50% 0.070%≤Nb≤0.50% 0.14%≤Mo≤2% 0.070%≤Cr≤2%. The composition may optionally include B, Ni and/or Cu. The remainder of the composition includes iron and unavoidable impurities inherent to fabrication, including hydrogen. The quantity Xp of the at least one metallic element under the form of carbides, nitrides or carbonitrides is, in weight: 0.030%≤Vp≤0.40% 0.030%≤Tip≤0.50% 0.040%≤Nbp≤0.40% 0.14%≤Mop≤0.44% 0.070%≤Crp≤0.6%. The hydrogen content Hmax designating the maximal hydrogen content that can be measured from a series of at least five specimens, and the quantity Xp, in weight, is such that: 1000 ⁢ H max X P ≤ 3.3 .

公开(公告)号：US10006099B2

公开(公告)日：2018-06-26

申请号：US14858276

申请日：2015-09-18

申请人： ARCELORMITTAL ,  THYSSENKRUPP STEEL EUROPE AG

发明人： Colin Scott ,  Philippe Cugy ,  Christian Allely

IPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C21D9/46 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C28/02 ,  C21D1/26 ,  C21D1/42 ,  C21D1/767 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/06 ,  B32B15/01

CPC分类号： C21D9/46 ,  B32B15/013 ,  C21D1/26 ,  C21D1/42 ,  C21D1/767 ,  C21D6/001 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0236 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C28/021 ,  C23C28/023 ,  C23C28/025 ,  C23C28/028 ,  Y02P10/253 ,  Y10T428/12799

摘要： A process for fabricating a steel sheet is provided. The process includes soaking a steel sheet. The steel has a composition including iron, carbon, manganese, silicon, aluminum, sulfur, phosphorus and nitrogen and at least one metallic element X chosen among vanadium, titanium, niobium, molybdenum, and chromium. A quantity Xp of metallic element under the form of carbides, nitrides or carbonitrides is, by weight: 0.030%≤Vp≤0.40%; 0.030%≤Tip≤0.50%; 0.040%≤Nbp≤0.40%; 0.14%≤Mop≤0.44%; or 0.070%≤Crp≤0.6%. The soaking step occurs under a pure nitrogen or argon atmosphere with a dew point lower than −30° C. at a soaking temperature θ between 250 and 900° C. and with a dynamic circulation of a regenerated atmosphere.