7SiMn合金钢的主要特性：27SiMn的性能高于30Mn2，具有较高的强度和耐磨性，淬透性较高，冷变形塑性中等，切削加工性能良好，焊接性能尚可，热处理时，钢的韧性降低较少，水冷时仍能保持较高的韧性，但有过热敏感性，白点敏感性及回火脆性倾向，大多在调质后使用，也可在正炎或热轧供货状态下使用。

化学成分

C：0.24～0.32 

Si：1.10～1.40 

Mn：1.10～1.40

P：<0.035 （残留含量）

S：<0.035 （残留含量）

Cr：≤0.309(残留含量)

Ni：≤0.30 （残留含量）

Cu：≤0.30 （残留含量）

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The main characteristics of 7SiMn alloy steel: 27SiMn performance is higher than 30Mn2, with high strength and wear resistance, high hardenability, medium cold deformation, good cutting performance, good welding performance, heat treatment, steel Less toughness reduction, high toughness when water cooling, but overheat sensitivity, white point sensitivity and temper brittleness tendency, mostly used after quenching and tempering, also in the case of positive or hot rolling supply use.

chemical composition

C: 0.24 to 0.32

Si: 1.10 to 1.40

Mn: 1.10 to 1.40

P: <0.035 (residual content)

S: <0.035 (residual content)

Cr: ≤ 0.309 (residual content)

Ni: ≤ 0.30 (residual content)

Cu: ≤ 0.30 (residual content)