* SCM430,4130 Material comparison table (Chromium molybdenum steels) 1. Chemical composition Code KS JIS AISI Material Grade SCM430 SCM430 4130 C 0.28~0.33 0.28~0.33 0.28~0.33 Si 0.15~0.35 0.15~0.35 0.15~0.30 Mn 0.60~0.85 0.60~0.85 0.40~0.60 P ≦0.030 ≦0.030 ≦0.035 S ≦0.030 ≦0.030 ≦0.040 Ni