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**35CrMnSiA**
**Grade:** 35CrMnSiA
**Standard:** GB/T 3077-1999
**Performance**
35CrMnSiA is a low-alloy ultra-high-strength steel that offers excellent mechanical properties after heat treatment. It exhibits high strength, good toughness, and good hardenability. This material also has acceptable formability and weldability, although it requires preheating before welding, especially when the thickness exceeds 3 mm. After welding, heat treatment is recommended to ensure optimal performance. However, it has relatively poor corrosion resistance and oxidation resistance, so it is typically used after low-temperature tempering or austempering. The steel is known for its high strength and impact resistance, making it suitable for demanding applications. Despite its advantages, it has a tendency toward temper brittleness, and its lateral impact toughness is not as strong as other materials.
**Use**
35CrMnSiA is commonly used in the production of medium-speed, heavy-duty, high-strength, and high-toughness components. It is ideal for manufacturing parts subjected to high loads and speeds, such as gears, shafts, clutches, sprockets, grinding wheel spindles, bushings, bolts, and nuts. Additionally, it can be used for components with lower wear resistance and under moderate temperature conditions. It is also employed in the fabrication of welded parts like vanes, valve plates, and non-corrosive pipes for high-pressure blowers.
**Chemical Composition**
- Carbon (C): 0.32 ~ 0.39%
- Silicon (Si): 1.10 ~ 1.40%
- Manganese (Mn): 0.80 ~ 1.10%
- Sulfur (S): ≤0.025%
- Phosphorus (P): ≤0.025%
- Chromium (Cr): 1.10 ~ 1.40%
- Nickel (Ni): ≤0.030%
- Copper (Cu): ≤0.025%
**Mechanical Properties**
- Tensile Strength σb: ≥1620 MPa (165 kgf/mm²)
- Yield Strength σs: ≥1275 MPa (130 kgf/mm²)
- Elongation δ5: ≥9%
- Section Shrinkage ψ: ≥40%
- Impact Work Akv: ≥31 J
- Impact Toughness αkv: ≥39 J/cm² (4 kgf·m/cm²)
- Hardness: ≤241 HB
**Heat Treatment Specification**
- Quenching: First at 950°C, then at 890°C, followed by oil cooling.
- Tempering: At 230°C, air or oil cooled.
- Austempering: At 880°C, tempered between 280–310°C.
**Delivery Condition**
The material can be delivered in different conditions, such as normalized, annealed, or high-temperature tempered, or without heat treatment. The delivery condition should be specified in the contract.
Editor: Hardware Business Network Information Center
Source: http://news.chinawj.com.cn
Chemical composition and mechanical properties of 35CrMnSiA
**Brief Introduction of Chemical Composition, Mechanical Properties and Main Uses of 35CrMnSiA**