1. Overview
60Si2Mn (equivalent to SUP7 in JIS) is a silicon-manganese alloy spring steel well known for its high strength, toughness, and superior fatigue resistance.
It is one of the most widely used spring steels for automotive suspension, mechanical springs, and heavy-load applications.
Jiaxiao MTC supplies 60Si2Mn alloy steel strips in both cold rolled annealed et hardened & tempered conditions, providing customers with stable performance, excellente planéité, and tight dimensional tolerances.
2. Chemical Composition and Equivalent Grades
| Standard | Equivalent Grades | C (%) | Mn (%) | Si (%) | P max | S max |
|---|---|---|---|---|---|---|
| DIN | 60Si2Mn | 0.52–0.65 | 0.60–0.90 | 1.50–2.00 | ≤0.035 | ≤0.035 |
| JIS | SUP7 | — | — | — | — | — |
The high silicon content (up to 2.00%) provides excellent elasticity and fatigue resistance, while manganese contributes to toughness and hardenability.
3. Production and Heat Treatment
Jiaxiao MTC utilizes a complete in-house production line to ensure quality consistency:
- Raw Material Selection:
High-quality hot rolled steel coils from ISO-certified sources. - Acid Pickling:
Removes oxide layers and impurities to ensure a clean surface before rolling. - Cold Rolling:
Reduces thickness and enhances precision, with tight control over flatness. - Annealing (for soft condition):
Improves ductility for subsequent forming or stamping processes. - Hardening and Tempering (for finished condition):
- Hardening temperature: approx. 850–880°C
- Tempering temperature: 400–550°C
This treatment yields an optimal balance of high tensile strength, elasticity, et impact toughness.
- Edge and Surface Finishing:
Options include polished, bright, or blue/yellow tempered surfaces, with slit, rounded, or square edges.
4. Mechanical Properties
| Condition | Hardness | Tensile Strength | Elastic Limit | Surface Finish | Edge Type |
|---|---|---|---|---|---|
| Annealed | ≤200 HV | 600–800 N/mm² | Medium | Bright / Polished | Slit / Mill |
| Hardened & Tempered | 45–52 HRC | 1500–1800 N/mm² | High | Blue / Yellow / Polished | Rounded / Square |
Available Dimensions:
- Thickness: 0.10–5.00 mm
- Width: up to 500 mm
- Hardness Range: 30–55 HRC
5. Material Characteristics
- High Strength:
Achieved through silicon-manganese alloying and precision tempering. - Excellent Fatigue Resistance:
Suitable for components under cyclic and dynamic loads. - Good Ductility and Elasticity:
Allows cold forming prior to final heat treatment. - High Hardenability:
Ensures uniform structure and mechanical performance across thickness. - Consistent Surface Quality:
Controlled rolling and polishing provide smooth, bright finishes with minimal decarburization.
6. Typical Applications
60Si2Mn steel strips are widely used in applications requiring resilient and durable spring materials, y compris:
- Automotive Industry:
Leaf springs, suspension components, clutch springs, and safety devices. - Mechanical Engineering:
Flat springs, pressure washers, and energy-absorbing parts. - Construction Tools:
Blades, scrapers, and trowels that demand strength and flexibility. - Hardware Manufacturing:
Metal clips, furniture accessories, and industrial connectors.
The material’s balance between tensile strength et elastic recovery makes it a benchmark grade in high-performance spring manufacturing.
7. Tolerances and Quality Control
Jiaxiao MTC ensures precise control of dimensional and mechanical parameters:
- Thickness tolerance: ±0.015–0.070 mm
- Width tolerance: ±0.20–0.80 mm
- Flatness deviation: ≤0.3% of width
- Straightness deviation: R1–R4 standard
Each production lot is tested for:
- Chemical composition accuracy
- Vickers and Rockwell hardness
- Tensile strength and elongation
- Surface finish and flatness
Quality inspection is conducted with advanced laboratory equipment to meet international standards.
8. Packaging and Delivery
Each coil is:
- Lightly oiled to prevent oxidation,
- Wrapped in anti-rust paper and plastic film,
- Packed in seaworthy wooden pallets or containers,
ensuring safe delivery and corrosion-free transport to customers worldwide.
9. About Jiaxiao MTC
Guangzhou Jiaxiao Material Technology Co., Ltée.
is a professional supplier of high carbon steel, acier allié, et bandes d'acier inoxydable in both hardened & tempered et cold rolled annealed conditions.
With a manufacturing area of 25,000 m² and an annual capacity of 15,000 tonnes, Jiaxiao MTC serves the automotive, spring, hardware, and tooling industries with reliable quality and precision products.
