42CrMo Steel in GB EN Standard

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.