发明名称 |
HIGH STRENGTH SPRING AND METHOD FOR MANUFACTURE THEREOF |
摘要 |
A high strength spring steel of this invention is characterized in containing, in percent of mass, of C: 0.36-0.48%; Si: 1.80-2.80%; Mn: 0.20-1.40%; P: 0.015% or less; S: 0.010% or less; Cu: 0.10-0.50%; Ni: 0.10-2.00%; Cr: 0.05-1.20%; s-Al: 0.005-0.040%; N: 0.002-0.012%; O: 0.002% or less, while the remainder is constituted of Fe and inevitable impurities and the quantity of inclusions of 10 mum or larger in diameter per field of vision of 100 mm<SUP>2 </SUP>is 10 or less. A manufacturing method of high strength spring of this invention is characterized in that the high strength spring steel which is tempered to HRC52 or higher is formed into a spring shape by hot forming or cold forming and warm shot peening is carried out so as to produce a high strength spring of 1176 MPa or higher in maximum shearing stress. |
申请公布号 |
EP1801253(A1) |
申请公布日期 |
2007.06.27 |
申请号 |
EP20040772233 |
申请日期 |
2004.08.26 |
申请人 |
DAIDO TOKUSHUKO KABUSHIKI KAISHA;NHK SPRING COMPANY LIMITED |
发明人 |
KIMURA, KAZUYOSHI;KOYAMA, HIROSHI;TANGE, AKIRA;OKUYAMA, ISAMU;HISANO, YOSUKE;YONEGUCHI, AKIO |
分类号 |
C22C38/00;B24C1/10;C21D8/00;C22C38/38 |
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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