60Si2Mn Spring Steel Bar Carbon Steel — Factory Direct Supplier | Huaxia-Steel

60Si2Mn spring steel bar is a high-silicon manganese spring steel widely used in the automotive, railway, and machinery sectors. With its excellent fatigue strength, high elastic limit, and good hardenability, 60Si2Mn is the Chinese GB standard equivalent of popular international spring grades such as 9260 (ASTM), 61SiCr7 (DIN), and SUP6/SUP7 (JIS). Huaxia-Steel supplies 60Si2Mn in hot-rolled, peeled, ground, and pre-hardened conditions with full mill certification.

Product Overview

60Si2Mn is a silicon-manganese alloyed spring steel with carbon content around 0.56–0.64%. The high silicon content (1.50–2.00%) significantly improves elastic limit and temper resistance, making it ideal for heavy-duty springs subject to cyclic loading. After quenching and tempering, 60Si2Mn achieves a tensile strength of 1,200–1,600 MPa depending on section size and tempering temperature.

Specifications

Parameter	Standard / Range
Standard	GB/T 1222, ASTM A29 (9260), JIS G4801 (SUP6)
Diameter	6 mm – 120 mm (hot-rolled); 6 mm – 80 mm (peeled/ground)
Length	3,000 – 6,000 mm (cut to length available)
Delivery Condition	Hot-rolled, annealed, Q+T, peeled, ground
Surface Quality	Black, turned, polished (h9-h11 tolerance)
Straightness	≤ 2 mm/m (standard); ≤ 1 mm/m (precision)

Chemical Composition (GB/T 1222)

Element	Content (%)
C	0.56 – 0.64
Si	1.50 – 2.00
Mn	0.60 – 0.90
Cr	≤ 0.35
P	≤ 0.035
S	≤ 0.035

Mechanical Properties (Q+T Condition)

Property	Value
Tensile Strength	≥ 1,275 MPa
Yield Strength	≥ 1,080 MPa
Elongation	≥ 9%
Reduction of Area	≥ 25%
Hardness (annealed)	≤ 321 HBW

Applications

• Automotive leaf springs and coil springs
• Railway carriage suspension springs
• Heavy machinery torsion bars
• Agricultural equipment springs
• Valve springs and clutch springs (finer diameters)

Quality Assurance

Each batch is ultrasonic tested for internal defects, and surface inspected for seams, laps, and cracks. Hardness uniformity is verified on every bar end. Mill test certificates include full ladle analysis, heat treatment batch number, and mechanical test results. Third-party inspection and fatigue testing are available on request.

Packing and Shipping

Bars are bundled in hexagonal or rectangular packs, steel-strapped, and wrapped in VCI film and kraft paper. Wooden cradles are used for diameters above 50 mm to prevent distortion during transit. Markers indicate heat number, grade, diameter, and length on every bundle.