10# 20# 35# 45# 40Cr 25Mn 37Mn5化学成分% ：
牌号 化学成分%
C Si Mn S P Cr
10 0.07-0.13 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035
20 0.17-0.23 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035
35 0.32-0.39 0.17-0.37 0.35-0.65 ≤0.035 ≤0.035
45 0.42-0.50 0.17-0.37 0.50-0.80 ≤0.035 ≤0.035
40Cr 0.37-0.44 0.17-0.37 0.50-0.80 ≤0.035 ≤0.035 0.08-1.10
25Mn 0.22-0.29 0.17-0.37 0.70-1.00 ≤0.035 ≤0.035 ≤0.25
37Mn5 0.30-0.39 0.15-0.30 1.20-1.50 ≤0.015 ≤0.020