公开(公告)号：EP1647608A1

公开(公告)日：2006-04-19

申请号：EP05019591.6

申请日：2005-09-08

申请人： NIPPON STEEL CORPORATION ,  TOYODA KOKI KABUSHIKI KAISHA

发明人： Nagato, Takashige ,  Ochi, Tatsuro ,  Nishi, Koji ,  Inagaki, Yuji ,  Ichikawa, Kazuyuki ,  Kashiwagi, Isashi ,  Saito, Toshiyuki

IPC分类号： C22C38/12 ,  C21D9/30

CPC分类号： C22C38/12 ,  C21D1/10 ,  C21D9/28 ,  C21D2211/002 ,  C21D2211/008 ,  Y02P10/253

摘要： A steel material for a high strength constant velocity joint intermediate shaft containing C: 0.46 to 0.52%, Si: 0.6 to 0.8%, Mn: 0.7 to 0.9%, S: 0.01 to 0.05%, Mo: 0.3 to 0.5%, B: 0.0005 to 0.005%, Al: 0.002 to 0.05%, and Ti: 0.02 to 0.09%, restricting N to 0.007% or less, Cr to 0.15% or less, and P to 0.02% or less, having a structural percentage of bainite + martensite of 40% or more, and having a hardness of 250 to 340HV and a high strength constant velocity joint intermediate shaft made of that steel material, having a spline-vanishing part with a surface hardness of 610 to 750HV and a ratio t/r of an effective hardened layer depth t and radius r of 0.35 to 0.55, having a flat part with a surface hardness of 630 to 770HV and a ratio t/r of an effective hardened layer depth t and radius r of 0.55 to 1.0, and having a core hardness of 250 to 340HV.

摘要翻译： C：0.46〜0.52％，Si：0.6〜0.8％，Mn：0.7〜0.9％，S：0.01〜0.05％，Mo：0.3〜0.5％的高强等速万向节中间轴用钢材，B： 0.0005〜0.005％，Al：0.002〜0.05％，Ti：0.02〜0.09％，N：0.007％以下，Cr：0.15％以下，P：0.02％以下，贝氏体+ 40％以上的马氏体，硬度为250〜340HV，由该钢材制成的高强度等速万向节中间轴，具有表面硬度为610〜750HV的花键消失部，比率t / r 的有效硬化层d

公开(公告)号：EP1647608B1

公开(公告)日：2008-06-11

申请号：EP05019591.6

申请日：2005-09-08

申请人： Nippon Steel Corporation ,  JTEKT Corporation

发明人： Nagato, Takashige ,  Ochi, Tatsuro ,  Nishi, Koji ,  Inagaki, Yuji ,  Ichikawa, Kazuyuki ,  Kashiwagi, Isashi ,  Saito, Toshiyuki

IPC分类号： C22C38/12 ,  C21D9/30

CPC分类号： C22C38/12 ,  C21D1/10 ,  C21D9/28 ,  C21D2211/002 ,  C21D2211/008 ,  Y02P10/253