Invention Grant
- Patent Title: Steel for high-strength spring, method for producing same, and high-strength spring
- Patent Title (中): 高强度弹簧钢,其制造方法和高强度弹簧
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Application No.: US13886106Application Date: 2013-05-02
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Publication No.: US09404547B2Publication Date: 2016-08-02
- Inventor: Hideki Okada , Akira Tange , Koichi Tango , Isao Sumiyoshi
- Applicant: NHK SPRING CO., LTD.
- Applicant Address: JP Yokohama-Shi, Kanagawa
- Assignee: NHK SPRING CO., LTD.
- Current Assignee: NHK SPRING CO., LTD.
- Current Assignee Address: JP Yokohama-Shi, Kanagawa
- Agency: Holtz, Holtz & Volek PC
- Priority: JP2010-252856 20101111
- Main IPC: F16F1/02
- IPC: F16F1/02 ; C22C38/42 ; C21D8/06 ; C21D7/06 ; C21D9/02 ; C22C38/00 ; C22C38/04 ; C22C38/06 ; C22C38/34 ; C22C38/50 ; C22C38/02

Abstract:
A steel for high-strength spring has an Ac3 transformation temperature as an indicator of the decarburization performance, which is calculated by Equation (1) below, is from 859 to 885° C., a maximum hardened diameter DI as an indicator of the hardening performance, which is calculated by Equation (2) below, is from 70 to 238 mm, and a temper hardness HRC as an indicator of the spring performance, which is calculated by Equation (3) below, is from 50 to 55. Ac3=910−203×√{square root over (C)}−15.2Ni+44.7Si+104V+31.5Mo+13.1W (1) DI=DO×fSi×fMn×fP×fS×fCu×fNi×fCr (2) HRC=38.99+17.48C+2.55Si−2.28Ni+2.37Cr+8.04Ti (3) wherein, D0=8.65×√{square root over (C)}, fSi=1+0.64×% Si, fMn=1+4.10×% Mn, fP=1+2.83×% P, fS=1−0.62×% S, fCu=1+0.27×% Cu, fNi=1+0.52×% Ni, and fCr=1+2.33×% Cr.
Public/Granted literature
- US20130240093A1 STEEL FOR HIGH-STRENGTH SPRING, METHOD FOR PRODUCING SAME, AND HIGH-STRENGTH SPRING Public/Granted day:2013-09-19
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