42CrMo is a chromium–molybdenum alloy structural steel known for its high strength, good toughness, and excellent hardenability. It performs reliably under high load, impact, and fatigue conditions, making it a preferred material for critical mechanical parts and high-stress components.
As one of the most recognized grades in China’s premium alloy steel category, 42CrMo offers outstanding mechanical properties and dimensional stability after quenching and tempering.
Chemical Composition (%):
C: 0.38–0.45
Si: 0.17–0.37
Mn: 0.50–0.80
Cr: 0.90–1.20
Mo: 0.15–0.25
P: ≤ 0.025
S: ≤ 0.025
Main Characteristics
Very high tensile and yield strength after heat treatment
Excellent impact toughness and fatigue resistance
Good wear resistance and uniform hardenability
Stable performance during quenching and tempering
Suitable for surface hardening (nitriding or high-frequency quenching)
Applications
42CrMo is widely used in manufacturing:
Forged shafts, gears, and connecting rods
High-pressure bolts and fasteners
Transmission components in heavy-duty machinery
Oil drilling tools, drill collars, and couplings
Automotive and aerospace parts under high stress
Equivalent Grades
ASTM/SAE: 4140 / 42CrMo4
DIN: 1.7225
JIS: SCM440
Your Trusted 42CrMo Steel Partner – ChinaSpecSteel
ChinaSpecSteel supplies high-quality 42CrMo alloy steel manufactured by Jiyuan Iron & Steel Group, a leading producer of special steels in China. With a complete long-process production line and precise control over every stage—from steelmaking to rolling—our 42CrMo products meet international standards for consistency, strength, and durability.
Supply Advantages:
Hot rolled and forged 42CrMo bars and billets
Customized heat treatment and machining services
Mill test certificates and third-party inspection (SGS / BV)
Competitive export pricing with stable quality supply
Prompt delivery and export-standard packaging
Available Forms:
Round bars, square bars, and forged billets
Heat-treated bars and precision components
OEM blanks for machinery and equipment parts
Jiyuan Iron & Steel Production Base
Jiyuan Iron & Steel Group operates a long-process production system that integrates ironmaking, steelmaking, and rolling. The company is equipped with modern testing instruments and automated control technology, achieving internationally advanced quality levels. It serves as one of China’s largest production bases for special steel bars and wire rods.
Main steel categories include bearing steel, spring steel, cord steel, cold heading steel, gear steel, free-cutting steel, non-quenched and tempered steel, alloy structural steel, carbon structural steel, high-strength wear-resistant steel, tube billet steel, anchor chain steel, and continuous cast iron profiles.
Deep-processed products include precision wire, heat-treated bars, bright bars, and fasteners, serving automotive, machinery, energy, and construction equipment industries worldwide.
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