65Mn Spring Steel Strip
65Mn spring steel strip is a high-carbon manganese steel known for its excellent elasticity, fatigue resistance, and wear properties. It is widely used in leaf springs, coil springs, and precision elastic components. Huaxia-Steel supplies 65Mn strips in cold-rolled, annealed, and hardened/tempered conditions with full traceability.
Product Overview
65Mn (GB/T 1222) is the Chinese national standard equivalent of AISI 1065 and DIN 1.0904. With approximately 0.62–0.70% carbon and 0.90–1.20% manganese, it achieves high hardness after quenching and tempering while retaining adequate toughness for spring applications.
Standard Specifications
| Standard | Grade | C (%) | Mn (%) | Hardness (HRC) |
|---|---|---|---|---|
| GB/T 1222 | 65Mn | 0.62–0.70 | 0.90–1.20 | 38–50 (H/T) |
| AISI | 1065 | 0.60–0.70 | 0.60–0.90 | 38–50 (H/T) |
| DIN | 1.0904 | 0.60–0.70 | 0.80–1.10 | 38–50 (H/T) |
Available Dimensions and Tolerances
| Thickness (mm) | Width (mm) | Coil ID (mm) | Coil Weight (kg) |
|---|---|---|---|
| 0.10 – 0.50 | 5 – 300 | 400 / 500 | 200 – 500 |
| 0.50 – 2.00 | 10 – 500 | 400 / 500 | 500 – 1,500 |
| 2.00 – 6.00 | 20 – 600 | 500 / 600 | 1,000 – 3,000 |
Tolerances: Thickness ±0.02 mm (precision), ±0.05 mm (standard). Width ±0.3 mm (slit edge), ±1.0 mm (mill edge).
Mechanical Properties
- Yield Strength: ≥ 785 MPa (quenched + tempered)
- Tensile Strength: 980–1,180 MPa (quenched + tempered)
- Elongation: ≥ 8% (annealed)
- Hardness: ≤ 240 HB (annealed); 38–50 HRC (quenched + tempered)
Applications
- Leaf springs and coil springs
- Clips, clamps, and retaining rings
- Saw blades and cutting tools
- Shim stock and washers
- Automotive and railway suspension components
Surface Finishes
- Bright polished: For precision springs and decorative parts
- Blue polished: For medium-duty springs with improved fatigue life
- Pickled / oiled: For general forming and stamping
Quality Assurance
- Mill test certificate (GB/T 1222 compliant)
- Third-party inspection by SGS, BV, or TÜV
- Flatness and edge camber inspection per EN 10051
- Surface quality check (visual and optional eddy current)
Packing and Shipping
Strips are coiled on steel or wooden reels, wrapped in VCI film, and packed in wooden crates or steel frames for ocean shipping. Each coil is labeled with heat number, grade, dimensions, and net weight.
Request a Quote for 65Mn Spring Steel Strip
Specify your thickness, width, hardness, surface finish, and quantity. Contact Huaxia-Steel for mill-direct pricing and flexible delivery terms.
