发明名称 |
STEEL BAR FOR STEERING RACK, METHOD FOR PRODUCING THE SAME, AND STEERING RACK USING THE SAME |
摘要 |
<p>A steel bar for a steering rack which comprises, in mass %, 0.50 to 0.60 % of C, 0.05 to 0.5 % of Si, 0.2 to 1.5 % of Mn, 0.0005 to 0.003 % of B, 0.005 to 0.05 % of Ti, 0.0005 to 0.1 % of Al and 0.002 to 0.02 % of N, wherein quenched and tempered structures of the portion located at a depth from the surface of the steel bar of D/4, wherein D is the diameter of the steel bar, satisfy the following requirements I), II) and III): I) the area percentage of the sum of tempered bainite and tempered martensite structures is 30 to 100 %, II) the area percentage of a regenerated pearlite structure is 0 to 50 %, and III) the area percentage of the sum of tempered bainite, tempered martensite and regenerated pearlite structures is 50 to 100 %.</p> |
申请公布号 |
WO2004106574(A1) |
申请公布日期 |
2004.12.09 |
申请号 |
WO2004JP07678 |
申请日期 |
2004.05.27 |
申请人 |
KOYO SEIKO CO., LTD.;OHTA, ATSUHIKO;KAMEI, MAKOTO;WATANABE, KAZUHIRO;KANAIKE, YUKINORI;TSUKAMOTO, OSAMU;IKEDA, MASAKAZU;ANAN, GOROU;ITOZIRI, HIROSHI |
发明人 |
OHTA, ATSUHIKO;KAMEI, MAKOTO;WATANABE, KAZUHIRO;KANAIKE, YUKINORI;TSUKAMOTO, OSAMU;IKEDA, MASAKAZU;ANAN, GOROU;ITOZIRI, HIROSHI |
分类号 |
B62D3/12;C21D1/18;C21D9/32;(IPC1-7):C22C38/00;C22C38/60;C22C38/14 |
主分类号 |
B62D3/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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