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1. Excellent High-Temperature Strength (Thermal Strength)
The Role of Molybdenum: The addition of Mo significantly increases the recrystallization temperature of the steel. This allows 20CrMo to maintain high strength and creep resistance at elevated temperatures between 500°C and 520°C without softening.
2. Superior Hardenability and Mechanical Properties
Compared to standard carbon steel or simple chromium steel, 20CrMo offers much better hardenability. This ensures that even pipes with larger cross-sections achieve a uniform microstructure and consistent mechanical properties after heat treatment.
Toughness-Strength Balance: After quenching and tempering, it exhibits high yield strength and impact toughness, making it capable of enduring extreme torque and pressure.
3. Exceptional Carburizing Performance
As a premium carburizing steel, 20CrMo develops an extremely hard, wear-resistant surface after carburizing and quenching, while the core remains tough. This “hard shell, tough core” characteristic drastically improves its resistance to impact and fatigue.
4. Good Weldability and Workability
Despite being an alloy steel, its low carbon content (approx. 0.20%) allows for relatively good cold-deformation plasticity and weldability. When preheated to 150°C - 200°C, high-quality welded joints can be achieved with a low risk of cracking.
5. Resistance to Hydrogen Embrittlement
In petrochemical applications, 20CrMo demonstrates a reliable resistance to hydrogen attack, making it suitable for high-pressure pipes conveying non-corrosive media and hydrogen mixtures.
