Description of mechanical properties and hardness of 41CR4 alloy structural steel
1. Introduction of 41CR4 alloy structural steel:
41CR4 (1.7035) is the most commonly used alloy structural steel grade in the world. Its tensile strength, yield strength and hardenability are higher than that of No. 40 steel, but it also has certain defects that its weldability is limited and has a tendency to form cracks. 41CR4 is generally used for more important quenched and tempered parts, such as parts working under alternating loads, parts with medium speed and medium load, etc.
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2. Alloy structural steel:
On the basis of carbon structural steel, appropriate alloying elements are added, which are mainly used to manufacture steel for mechanical parts with large cross-sectional dimensions. It has suitable hardenability, high strength, toughness and fatigue strength after corresponding heat treatment, and low brittle transition temperature. This type of steel mainly includes quenched and tempered steel, case-hardened steel, and cold-plastic formed steel.
3. 41CR4 implementation standard: Implement the European standard EN 10083/1-1991 standard.
4. 41CR4 delivery status: delivery in heat treated (normalized, annealed or high temperature tempered) or not heat treated. PS: If the customer has other performance requirements, the delivery status requirements should be indicated in the contract.
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五、41CR4化学成分（元素成分：Wt%）：
碳 C ：0.38~0.45 硅 Si：允许残余含量≤0.40
锰 Mn：0.60~0.90 硫 S ：允许残余含量≤0.035 磷 P ：允许残余含量≤0.035 铬 CR：0.90~1.20 镍 Ni：允许残余含量≤0.030 铜 Cu：允许残余含量≤0.030
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6. 41CR4 mechanical properties:
抗拉强度 Σb （Mpa）：≥980（100） 屈服强度 Σs （Mpa）：≥785（80）
伸长率 Δ5 （%）：≥9 断面收缩率 Ψ （%）：≥45
冲击功 Akv （J）：≥47 冲击韧性值 Αkv （J/CM2）：≥59（6）
Hardness: ≤207HB