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专利名称：SPRING AND MANUFACTURE METHOD
THEREOF
发明人：Takeshi Suzuki,Yoshiki Ono,Shimpei
Kurokawa,Kosuke Shibairi
申请号：US13811152申请日：20110804
公开号：US20130118655A1公开日：20130516
专利附图：
摘要：A spring consists of, by mass %, 0.5 to 0.7% of C, 1.0 to 2.0% of Si, 0.1 to 1.0% ofMn, 0.1 to 1.0% of Cr, not more than 0.035% of P, not more than 0.035% of S, and the
balance of Fe and inevitable impurities. The spring has a structure including not less than65% of bainite and 4 to 13% of residual austenite by area ratio in a cross section. Thespring has a compressive residual stress layer in a cross section from a surface to a depthof 0.35 mm to D/4, in which D (mm) is a circle-equivalent diameter of the cross section.The spring has a high hardness layer with greater hardness than a center portion by 50 to500 HV from a surface to a depth of 0.05 to 0.3 mm.
申请人：Takeshi Suzuki,Yoshiki Ono,Shimpei Kurokawa,Kosuke Shibairi
地址：Yokohama-shi JP,Yokohama-shi JP,Yokohama-shi JP,Yokohama-shi JP
国籍：JP,JP,JP,JP
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