40Cr steel is a medium carbon chromium alloy steel widely used for machinery parts and transmission components that demand high strength, toughness, and wear resistance. It offers excellent mechanical performance after quenching and tempering, making it one of the most versatile and popular grades in China’s special alloy structural steel category.
Chemical Composition (%):
Si: 0.17–0.37
Mn: 0.50–0.80
Cr: 0.80–1.10
P: ≤ 0.025
S: ≤ 0.025
Main Characteristics
High strength and hardness after heat treatment
Good toughness and fatigue resistance
Stable hardenability and machinability
Suitable for surface hardening (nitriding or high-frequency quenching)
Excellent balance of performance and cost
Applications
40Cr steel is widely used in:
Automotive and motorcycle gears, shafts, and axles
Machine tool spindles and bolts
Transmission parts and connecting rods
Forged components for industrial and agricultural machinery
Hydraulic and mechanical shafts requiring long service life
Equivalent Grades
DIN: 41Cr4 / 1.7035
ASTM/SAE: 5140
JIS: SCr440
Trusted 40Cr Steel Supplier – ChinaSpecSteel
ChinaSpecSteel supplies high-quality 40Cr alloy steel produced by Jiyuan Iron & Steel Group, one of China’s leading special steel manufacturers. Backed by a complete production line and advanced testing systems, every batch of 40Cr steel meets international standards for consistency and reliability.
We offer:
Hot rolled, forged, and heat-treated 40Cr bars and billets
Custom cutting and machining services
SGS/BV inspection support
Competitive factory pricing for global buyers
Fast delivery and export-standard packaging
Round, square, and flat bars
Forged shafts and gear blanks
Heat-treated bars and precision rods
Production Base – Jiyuan Iron & Steel
Jiyuan Iron & Steel Group operates a long-process steelmaking system, integrating ironmaking, steelmaking, and rolling. Equipped with advanced production and inspection equipment, the company’s technology ranks at the international advanced level. It is one of China’s largest production bases for special steel bars and wire rods.
Main steel grades include bearing steel, spring steel, cord steel, cold heading steel, gear steel, free-cutting steel, non-quenched & 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 customers in automotive, energy, and industrial machinery sectors around the world.
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