钢号 C Si Mn S P Cr Ni Mo S35C 0.32~0.38 0.15~0.35 0.60~0.90 ≤0.030 ≤0.030 S40C 0.37~0.43 0.15~0.35 0.60~0.90 ≤0.030 ≤0.030 S45C 0.42~0.48 0.15~0.35 0.60~0.90 ≤0.030 ≤0.030 S50C 0.47~0.53 0.15~0.35 0.60~0.90 ≤0.030 ≤0.030 S55C 0.52~0.58 0.15~0.35 0.60~0.90 ≤0.030 ≤0.030 SCM430 0.28~0.33 0.15~0.35 0.60~0.85 ≤0.030 ≤0.030 0.90~1.20 0.15~0.30 SCM435 0.33~0.38 0.15~0.35 0.60~0.85 ≤0.030 ≤0.030 0.90~1.20 0.15~0.30 SCM440 0.38~0.43 0.15~0.35 0.60~0.85 ≤0.030 ≤0.030 0.90~1.20 0.15~0.30 SCM445 0.43~0.48 0.15~0.35 0.60~0.80 ≤0.030 ≤0.030 0.90~1.20 0.15~0.30 SNC631 0.27~0.35 0.15~0.35 0.35~0.65 ≤0.030 ≤0.030 0.60~1.00 2.50~3.00 SNC836 0.32~0.40 0.15~0.35 0.35~0.65 ≤0.030 ≤0.030 0.6~1.00 3.00~3.50 SNCM625 0.20~0.30 0.15~0.35 0.35~0.60 ≤0.030 ≤0.030 1.00~1.50 3.00~3.50 0.15~0.30 SNCM630 0.25~0.35 0.15~0.35 0.35~0.60 ≤0.030 ≤0.030 2.50~3.50 2.50~3.50 0.50~0.70 SNCM639 0.36~0.43 0.15~0.35 0.35~0.90 ≤0.030 ≤0.030 0.60~1.00 1.60~2.00 0.15~0.30
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