公开(公告)号：US09404547B2

公开(公告)日：2016-08-02

申请号：US13886106

申请日：2013-05-02

Applicant: NHK SPRING CO., LTD.

Inventor： Hideki Okada ,  Akira Tange ,  Koichi Tango ,  Isao Sumiyoshi

IPC: F16F1/02 ,  C22C38/42 ,  C21D8/06 ,  C21D7/06 ,  C21D9/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/50 ,  C22C38/02

CPC classification number: F16F1/021 ,  C21D7/06 ,  C21D8/06 ,  C21D8/065 ,  C21D9/02 ,  C21D9/52 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/20 ,  C22C38/28 ,  C22C38/34 ,  C22C38/42 ,  C22C38/46 ,  C22C38/50 ,  F16F1/02

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.

Abstract translation: 用于高强度弹簧的钢具有作为脱碳性能的指示剂的Ac 3相变温度，其由下式（1）计算，为859〜885℃，最大硬化直径DI为硬化指标 由下式（2）计算的性能为70〜238mm，由下式（3）计算出的作为弹簧性能的指标的回火硬度HRC为50〜55。Ac3 = （1）DI = DO×fSi×fMn×fP×fS×fCu×fNi×fCr（2）（10） HRC = 38.99 + 17.48℃+ 2.55Si-2.28Ni + 2.37Cr + 8.04Ti（3）其中，D0 = 8.65×√{平方根超过（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，fCr = 1 + 2.33×％ 。