A high-strength chromium-molybdenum alloy structural steel supplied to GB and EN standards for demanding engineering applications. Offered to meet GB/T 3077 as 42CrMo and to the European EN 10083-3 standard as 42CrMo4, this grade combines high strength, good hardenability and toughness with low quench distortion and strong long-term creep and fatigue resistance after appropriate heat treatment (typically quenching and tempering).
Key features
- High tensile strength and yield strength after quench & tempering
- Good hardenability for larger cross-sections with uniform properties
- Good toughness and resistance to tempering brittleness
- Stable dimensional performance with low distortion on quenching
- Good high-temperature creep strength and long-term strength
Typical product forms
- Round bars and rods
- Forgings and shafts
- Machined components and finished parts
- Plates and blanks for further processing
Common applications
- Heavy-duty gears and gear blanks (locomotive traction, transmission gears)
- Large axles, heavily loaded connecting rods and shafts
- Pressure-vessel components and high-strength forgings
- Oilfield drill pipe joints and fishing tools (shallow to moderate depths)
- Large and medium plastic and metal molds where higher strength and toughness are required
Processing and heat treatment
- Best performance achieved by quenching and tempering to the required hardness/strength level
- Good hardenability allows thicker sections to be heat treated with uniform properties
- Suitable for machining, forging and controlled cooling processes
Compliance and equivalents
- Chinese standard: GB/T 3077 (42CrMo)
- European equivalent: EN 10083-3 (42CrMo4)
If you require specific supply forms, chemical analysis certificates, mechanical property ranges, or heat-treatment conditions, request a technical datasheet and supply specification to ensure the delivered material meets your application requirements.
