牌号 化 学 成 份 % C Si Mn P S Cr Ni Cu 65Mn 0.62-0.70 0.17-0.37 0.90-1.20 ≤0.035 ≤0.035 ≤0.25 ≤0.25 ≤0.25 55Si2Mn 0.52-0.60 1.50-2.00 0.60-0.90 ≤0.035 ≤0.035 ≤0.035 ≤0.035 ≤0.25 60Si2Mn 0.56-0.64 ≤0.035 ≤0.035 ≤0.035 ≤0.035 ≤0.25 65Si2Mn 0.56-0.64 ≤0.030 ≤0.030 ≤0.035 ≤0.035 ≤0.25