**Brief Introduction to the Chemical Composition, Mechanical Properties, and Main Applications of 37CrNi3A**
37CrNi3A is an alloy structural steel grade defined by Chinese national standards. Its unified numerical code is A42372. This high-performance steel is widely used in heavy-duty mechanical components due to its excellent strength, toughness, and hardenability.
**Chemical Composition (in %):**
- Carbon (C): 0.34–0.41
- Silicon (Si): 0.17–0.37
- Manganese (Mn): 0.30–0.60
- Chromium (Cr): 1.20–1.60
- Nickel (Ni): 3.00–3.50
**Mechanical Properties (for a sample size of 25mm):**
- **Quenching temperature:** 820°C, cooled with oil
- **Tempering temperature:** 500°C, cooled with water or oil
- **Tensile strength (σb):** ≥1130 MPa
- **Yield strength (σs):** ≥980 MPa
- **Elongation (δ5):** ≥10%
- **Reduction of area (ψ):** ≥50%
- **Impact energy (Aku2):** ≥47 J
- **Brinell hardness (HBS 100/3000):** ≤269 (annealed or high-temperature tempered)
**Key Characteristics:**
37CrNi3A exhibits high toughness, excellent hardenability, and can be fully hardened by oil cooling even for parts up to Φ150mm. It maintains stable creep resistance at 450°C and shows good low-temperature impact toughness. However, it is prone to second-type temper brittleness when tempered between 450–550°C and has a tendency to form white spots. Due to its high hardenability, normalizing and high-temperature tempering are typically required to improve machinability and reduce hardness.
**Common Applications:**
This steel is commonly used for manufacturing large-section, high-stress components such as rotor shafts, impellers, and critical fasteners. It is also suitable for parts that operate under impact loads, low temperatures, or hot-forged conditions.
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**Editor:** Hardware Business Network Information Center
**Source:** [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
This material provides a comprehensive overview of 37CrNi3A, making it a valuable resource for engineers, metallurgists, and industry professionals involved in material selection and application design.
**Editor:** Hardware Business Network Information Center
**Source:** [http://news.chinawj.com.cn](http://news.chinawj.com.cn)
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