7SiMn合金鋼的主要特性：27SiMn的性能高于30Mn2，具有較高的強度和耐磨性，淬透性較高，冷變形塑性中等，切削加工性能良好，焊接性能尚可，熱處理時，鋼的韌性降低較少，水冷時仍能保持較高的韌性，但有過熱敏感性，白點敏感性及回火脆性傾向，大多在調質后使用，也可在正炎或熱軋供貨狀態下使用。

化學成分

C：0.24～0.32 

Si：1.10～1.40 

Mn：1.10～1.40

P：<0.035 （殘留含量）

S：<0.035 （殘留含量）

Cr：≤0.309(殘留含量)

Ni：≤0.30 （殘留含量）

Cu：≤0.30 （殘留含量）

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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)