S30C與SCM430差在哪裡?

Question

S30C與SCM430一樣是含碳量30﹪,材質.元素有何差異?

加工後熱處理要達HRC42~HRC45是否可以?抗拉強度有何不同?

Answer 1

S30C是碳鋼,SCM430是鉻鉬鋼,兩者含碳量皆約0.3%,硬度也差不多,熱處理後硬度約 HRC40~HRC45,差別在強度,S30C的Yield Strength是90,000Psi, 而SCM430的Yield Strength是200,000Psi.元素差異見下表.         Symbol of Class and Chemical Compositon of Carbon SteelSymbol of class Chemical composition %C Si MnP S S10C0.08 to 0.130.15 to 0.350.30 to 0.600.030 max.0.035 max.S12C0.10 to 0.150.15 to 0.350.30 to 0.600.030 max.0.035 max.S15C0.13 to 0.180.15 to 0.350.30 to 0.600.030 max.0.035 max.S17C0.15 to 0.200.15 to 0.350.30 to 0.600.030 max.0.035 max.S20C0.18 to 0.230.15 to 0.350.30 to 0.600.030 max.0.035 max.S22C 0.20 to 0.250.15 to 0.350.30 to 0.600.030 max.0.035 max.S25C 0.22 to 0.280.15 to 0.350.30 to 0.600.030 max.0.035 max.S28C 0.25 to 0.310.15 to 0.350.30 to 0.900.030 max.0.035 max.S30C 0.27 to 0.330.15 to 0.350.30 to 0.900.030 max.0.035 max.S33C0.30 to 0.360.15 to 0.350.30 to 0.900.030 max.0.035 max.S35C 0.32 to 0.380.15 to 0.350.30 to 0.900.030 max.0.035 max.S38C 0.35 to 0.410.15 to 0.350.30 to 0.900.030 max.0.035 max.S40C 0.37 to 0.430.15 to 0.350.30 to 0.900.030 max.0.035 max.S43C 0.40 to 0.460.15 to 0.350.30 to 0.900.030 max.0.035 max.S45C 0.42 to 0.480.15 to 0.350.30 to 0.900.030 max.0.035 max.S48C 0.45 to 0.510.15 to 0.350.30 to 0.900.030 max.0.035 max.S50C 0.47 to 0.530.15 to 0.350.30 to 0.900.030 max.0.035 max.S53C 0.50 to 0.560.15 to 0.350.30 to 0.900.030 max.0.035 max.S55C 0.52 to 0.580.15 to 0.350.30 to 0.900.030 max.0.035 max.S58C 0.55 to 0.610.15 to 0.350.30 to 0.900.030 max.0.035 max.S09C0.07 to 0.120.15 to 0.350.30 to 0.600.025 max.0.025 max.S15C0.13 to 0.180.15 to 0.350.30 to 0.600.025 max.0.025 max.S20C0.18 to 0.230.15 to 0.350.30 to 0.600.025 max.0.025 max.JIS G4105鉻鉬合金鋼化學成分表記 號 化 學 成 分 % CSi Mn P SCr MoSCM415 0.13-0.18 0.15-0.350.60-0.85 0.030以下0.030以下0.90-1.20 0.15-0.30SCM418 0.16-0.21 SCM420 0.18-0.23 SCM421 0.17-0.23 0.70-1.00 SCM430 0.28-0.33 0.60-0.85 SCM432 0.27-0.37 0.30-0.60 1.00-1.50 SCM435 0.33-0.380.60-0.85 0.90-1.20SCM440 0.38-0.43 註：不純物Cu不得超過0.30%，Ni不得超過0.25%。

Answer 2

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