发明名称 |
Steel material for mechanical structure excellent in suitability for rolling, quenching crack resistance, and torsional property and drive shaft |
摘要 |
A machine structural steel product having superior formability of rotary-forming, torsional properties, and quenching-crack resistance is provided which is manufactured using an electric furnace instead of a blast furnace and which removes adverse influences of tramp elements. A drive shaft having a superior static strength and fatigue strength is provided. In particular, the machine structural steel product contains: on a mass percent basis, C: 0.35% to 0.50%; Si: 0.15% or less; Mn: 0.20% to 1.1%; P: 0.02% or less; S: 0.005% to 0.035%; Cr: more than 0.1% to 0.2%; Mo: 0.05% to 0.5%; Ti: 0.01% to 0.05%; Al: 0.01% to 0.05%; N: 0.01% or less; B: 0.0005% to 0.0050%; Cu: 0.06% to 0.25%; and Ni: 0.05% to 0.2%, and in addition, the composition described above is adjusted so that an LD value represented by the following equation (1) satisfies 120 or l
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申请公布号 |
US2006065328(A1) |
申请公布日期 |
2006.03.30 |
申请号 |
US20050526802 |
申请日期 |
2005.03.07 |
申请人 |
OMORI YASUHIRO;MATSUZAKI AKIHIRO |
发明人 |
OMORI YASUHIRO;MATSUZAKI AKIHIRO |
分类号 |
C22C38/54;C21D9/28;C22C38/00;C22C38/42;C22C38/44;C22C38/50 |
主分类号 |
C22C38/54 |
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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