有高的强度、韧度和良好的淬透性和抗过热的稳定性，但白点敏感性高，有回火脆性。焊接性较差，焊前需经高温预热，焊后需消除应力，经调质后使用。

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≤0.25

钼Mo0.15～0.25

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It has high strength, toughness, good hardenability and resistance to overheating, but has high white point sensitivity and temper brittleness. Poor weldability, preheating before high temperature, need to eliminate stress after welding, after quenching and tempering.

chemical composition

Carbon C 0.37~0.44

Silicon Si 0.17~0.37

Manganese Mn 0.50~0.80

Sulfur S allows residual content ≤0.025

Phosphorus P allows residual content ≤0.025

Chromium Cr 0.60～0.90

Nickel Ni 1.25~1.65

Copper Cu allows residual content ≤ 0.25

Molybdenum Mo0.15～0.25