42CrMo alloy structural steel

Standard: GB/T 3077

Description: 42CrMo alloy steel is a high-strength, medium-carbon steel. 42CrMo alloy steel has high strength, good toughness and excellent hardenability. As a chromium-molybdenum alloy steel, 42CrMo is widely used in key components that need to withstand high stress,...

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42CrMo alloy steel is a high-strength, medium-carbon steel. 42CrMo alloy steel has high strength, good toughness and excellent hardenability. As a chromium-molybdenum alloy steel, 42CrMo is widely used in key components that need to withstand high stress, high impact load and fatigue load.

42CrMo alloy structural steel under the Chinese GB/T 3077 standard. 42CrMo steel is a medium carbon chromium-molybdenum alloy structural steel with excellent performance. It is renowned for its high fatigue strength, good hardenability, and excellent impact resistance after heat treatment.

Steel Types:
- Forged steel for large components.
- Rolled steel for structural applications.
- Heat-treated steel for enhanced mechanical properties.

Conventional Sizes:
Round bars: Diameter ranging from 10mm to 500mm.
Flat bars: Thickness from 10mm to 200mm, width up to 1000mm.
Steel Plates: Thickness from 10mm to 300mm.
Forgings: Custom sizes based on specific requirements.

Chemical Composition of 42CrMo Alloy Steel

The chemical composition of 42CrMo steel contributes to its robust performance.

Element	C	Si	Mn	Cr	Mo	P	S
Content (%)	0.38-0.45	0.17-0.37	0.50-0.80	0.90-1.20	0.15-0.25	≤0.035	≤0.035

Mechanical Properties of 42CrMo Alloy Steel

The mechanical properties of 42CrMo steel make it suitable for demanding applications. These properties are typically achieved after quenching and tempering processes.

Property	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HB)
Value	≥1080	≥930	≥12	≤217 (annealed)

Equivalent Grades of 42CrMo Alloy Steel

42CrMo steel has equivalent grades in various international standards, ensuring its global applicability.

Standard	Grade
EN/DIN	42CrMo4 / 1.7225
AISI/SAE	4140
JIS	SCM440

Pre: DIN/EN 45CrMoV6-7 1.7737 alloy steel

Next: 42CrMoA Hot Rolled Alloy Steel

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