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力学性能：
抗拉强度 σb (MPa)≥980(100),
伸长率 δ5 (%)≥12,
断面收缩率 ψ (%)≥55,
冲击功 Akv (J)≥25,冲击韧性值 αkv (J/cm2)≥98(10)
冲击功 Akv (J)≥25,冲击韧性值 αkv (J/cm2)≥98(10)
化学成分
碳C 0.37~0.44
硅Si 0.17~0.37
锰Mn0.50～0.80
硫S 允许残余含量≤0.025
磷P 允许残余含量≤0.025
铬Cr 0.60～0.90
镍Ni 1.25～1.65
铜Cu 允许残余含量≤0.025
钼Mo0.15～0.25
20CrMnTiH 20CrMnTiAH 20CrNi3H 20CrNi3AH 12Cr2Ni4H 12Cr2Ni4AH 20CrNiMoH 20CrNiMoAH 20CrNi2MoH 20CrNi2MoAH
5易切削钢
Y12 Y12Pb Y15 Y15Pb Y20 Y30 Y35 Y40Mn Y45Ca
20CrMnTiH 20CrMnTiAH 20CrNi3H 20CrNi3AH 12Cr2Ni4H 12Cr2Ni4AH 20CrNiMoH 20CrNiMoAH 20CrNi2MoH 20CrNi2MoAH
5易切削钢
Y12 Y12Pb Y15 Y15Pb Y20 Y30 Y35 Y40Mn Y45Ca
