* SCM435,4135,4137,708A37,34CrMo4 Material comparison table (Chromium molybdenum steels) 1. Chemical composition Code KS JIS AISI AISI BS DIN Material Grade SCM435 SCM435 4135 4137 708A37 34CrMo4 C 0.33~0.38 0.33~0.38 0.32~0.39 0.35~0.40 0.35~0.40 0.30~0.37 Si 0.15~0.35 0.15~0.35 0.15~0.30 0.15~0.30 0.10~0.35 0.15~0.40 Mn 0.60~0.85 0.60~0.85 0.65~0.95 0.70~0.90 0.70~1.00 0.50~0.80 P ≦0.030 ≦0.03..