| 发明名称 |
HOLLOW SEAMLESS PIPE FOR HIGH-STRENGTH SPRING |
| 摘要 |
A hollow seamless pipe for a high-strength spring in the present invention includes a steel material in which chemical component compositions are properly adjusted, wherein a depth of a whole decarburized layer in an inner surface layer part is 100 μm or less, a depth of a flaw which is present in an inner surface is 40 μm or less, a width of the flaw is 60 μm or less, and a number density of a carbide which has a circle equivalent diameter of 500 nm or more and is present in the inner surface layer part is 1.8×10−2 particles/μm2 or less. |
| 申请公布号 |
US2015285410(A1) |
申请公布日期 |
2015.10.08 |
| 申请号 |
US201314389866 |
申请日期 |
2013.04.02 |
| 申请人 |
KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD) ;SHINKO METAL PRODUCTS CO. LTD. ;NHK SPRING CO, LTD |
发明人 |
Kochi Takuya;Hatano Hitoshi;Tamura Eiichi;Toyotake Kotaro;Yajima Takashi;Tange Akira |
| 分类号 |
F16L9/02;C22C38/54;C22C38/50;C22C38/48;C22C38/46;C22C38/00;C22C38/42;C22C38/34;C22C38/06;C22C38/04;C22C38/02;F16F1/02;C22C38/44 |
主分类号 |
F16L9/02 |
| 代理机构 |
|
代理人 |
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| 主权项 |
1. A hollow seamless pipe for a high-strength spring, comprising a steel material comprising 0.2 mass % to 0.7 mass % of C, 0.5 mass % to 3 mass % of Si, 0.1 mass % to 2 mass % of Mn, more than 0 mass % and 0.1 mass % or less of Al, more than 0 mass % and 3 mass % or less of Cr, more than 0 mass % and 0.02 mass % or less of P, more than 0 mass % and 0.02 mass % or less of S, and more than 0 mass % and 0.02 mass % or less of N, wherein a depth of a whole decarburized layer in an inner surface layer part is 100 μm or less, a depth of a flaw which is present in an inner surface is 40 μm or less, a width of the flaw is 60 μm or less, and a number density of a carbide which has a circle equivalent diameter of 500 nm or more and is present in the inner surface layer part is 1.8×10−2 particles/μm2 or less. |
| 地址 |
Kobe shi, Hyogo JP |
