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公开(公告)号:US10041160B2
公开(公告)日:2018-08-07
申请号:US15021048
申请日:2014-09-11
发明人: Minoru Honjo , Kiyoshi Uwai , Shigeru Endo , Katsutoshi Yamashita , Koei Tsuru , Keiichi Fujie , Akira Tange
IPC分类号: C22C38/02 , C22C38/04 , C22C38/18 , C21D8/06 , C21D9/02 , F16F1/02 , C22C38/60 , C22C38/00 , C21D1/25 , C21D1/18 , C21D6/00 , C21D9/52 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/42
摘要: Provided is high strength steel for springs that, compared to conventional high strength steel for springs, has excellent decarburization resistance and scale exfoliation property, by optimization of the added amounts of C, Si, Mn, and Cr as well as of Sb and Sn. The steel for springs contains C: more than 0.45 mass % and less than 0.65 mass %, Si: 0.15 mass % or more and 0.70 mass % or less, Mn: 0.10 mass % or more and 1.00 mass % or less, Cr: 0.20 mass % or more and 1.50 mass % or less, P: 0.025 mass % or less, S: 0.025 mass % or less, O: 0.0015 mass % or less, Sb: 0.010 mass % or more and less than 0.030 mass %, and Sn: 0.010 mass % or more and 0.030 mass % or less, under predetermined conditions.