65Mn is a high-carbon manganese steel with excellent strength, hardness, and elasticity after proper heat treatment. It offers a good balance of toughness and wear resistance, making it one of the most widely used spring steels in industrial manufacturing. The grade is particularly suited for components under cyclic or impact load, such as springs, saw blades, and clutch parts.
Its chemical composition and fine microstructure ensure uniform performance and reliable fatigue life, making 65Mn a preferred material for both mechanical and automotive applications where precision and durability are required.
Chemical Composition (% by weight)
C: 0.62–0.70
Si: 0.17–0.37
Mn: 0.90–1.20
P: ≤ 0.025
S: ≤ 0.025
Material Characteristics
High elastic limit and fatigue strength after quenching and tempering
Good wear resistance and surface hardness
Stable microstructure with strong response to heat treatment
Suitable for induction or oil hardening processes
Good machinability in annealed condition; reduced distortion during quenching
Typical Applications
65Mn steel is used across various mechanical, automotive, and tool manufacturing sectors.
Common applications include:
Coil and leaf springs in automobiles, motorcycles, and machinery
Clutch plates and valve springs
Industrial saw blades, measuring tapes, and hand tools
Wear-resistant washers, rings, and shims
Small forgings and precision parts requiring elastic strength
Equivalent Grades:
DIN: Ck67 / 1.1231
ASTM/SAE: 1566 (approx.)
JIS: SUP6
Reliable Supply from ChinaSpecSteel
ChinaSpecSteel provides 65Mn spring steel manufactured by Jiyuan Iron & Steel Group, a long-established producer of high-grade special steel in China.
The steel is produced through a long-process route integrating ironmaking, steelmaking, and rolling, ensuring a high degree of control over composition, purity, and performance stability.
Available Supply Forms:
Hot rolled and forged bars, billets, and coils
Heat-treated or normalized options per specification
Custom lengths and diameters for OEM production
Mill test certificates (MTC) and third-party inspections (SGS/BV)
Consistent export-grade packaging and global logistics support
Processing Options:
Quenching and tempering
Induction hardening
Surface finishing and precision cutting
Manufacturing Strength — Jiyuan Iron & Steel
Jiyuan Iron & Steel Group is one of China’s core producers of special bar and wire rod steel, equipped with advanced smelting, refining, and inspection technology. Its long-process production line delivers exceptional consistency from raw iron to finished material.
The company’s product range includes 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.
Further processed products such as precision wire, heat-treated bars, bright bars, and fasteners serve industries including automotive manufacturing, machinery production, and energy equipment.
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