发明名称 |
HIGH CLEANLINESS SPRING STEEL AND HIGH CLEANLINESS SPRING EXCELLENT IN FATIGUE CHARACTERISTICS |
摘要 |
High cleanliness spring steel useful in manufacturing a spring with SiO 2 -based inclusions being extremely controlled and excellent in fatigue properties is provided.
High cleanliness spring steel which is steel containing;
C: 1.2% (means mass%, hereafter the same with respect to the component) or below (not inclusive of 0%),
Si: 1.2-4%,
Mn: 0.1-2.0%,
Al: 0.01% or below (not inclusive of 0%),
and the balance comprising iron with inevitable impurities,
wherein;
the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 µm or above of D and oxide-based inclusions of less than 4 L/D and 25 µm or above of L, in the oxide-based inclusions of 25 mass% or above of oxygen concentration and 70% (means mass%,
hereafter the same with respect to inclusions) or above of SiO 2 content when Al 2 O 3 + MgO + CaO + SiO 2 + MnO = 100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below. |
申请公布号 |
EP2028285(A1) |
申请公布日期 |
2009.02.25 |
申请号 |
EP20070743972 |
申请日期 |
2007.05.23 |
申请人 |
KABUSHIKI KAISHA KOBE SEIKO SHO |
发明人 |
SUGIMURA, TOMOKO;KIMURA, SEI;SAKAMOTO, KOICHI;YOSHIDA, ATSUHIKO;INOUE, TAKESHI |
分类号 |
C22C38/00;C21D7/04;C21D7/06;C22C38/02;C22C38/04;C22C38/06;C22C38/08;C22C38/12;C22C38/18;C22C38/24;C22C38/28;C22C38/34;C22C38/40;C22C38/44;C22C38/46;F16F1/02 |
主分类号 |
C22C38/00 |
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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