| 摘要 |
A steel for high-strength spring has an Ac 3 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.
wherein, D 0 = 8.65 × C , f Si =1+0.64×Si, f Mn =1+4.10×%Mn, f P =1+2.83×%P, f S =1-0.62×%S, f Cu =1+0.27×%Cu, f Ni =1+0.52×%Ni, and f Cr =1+2.33×%Cr. |
