Overview
CgoodSteel’s automotive spring steel strips are engineered to deliver exceptional elasticity, fatigue resistance, and durability in demanding vehicle applications. Manufactured under strict thermal and mechanical controls, our strips ensure reliable performance in suspension systems, clutch springs, seat mechanisms, and other critical elastic components.
We support global automotive manufacturers and Tier‑1 suppliers with customized material solutions that meet international standards and OEM specifications.
Key Features
- High Elastic Limit & Excellent Fatigue Resistance – withstands repeated loading and unloading
- Uniform Hardness & Dimensional Precision – consistent performance across batches
- Good Formability & Weldability – suitable for complex forming and joining processes
- Controlled Decarburization & Surface Quality – optimized for subsequent heat treatment and coating
- Available in Annealed or Hardened & Tempered Conditions – ready for fabrication or direct use
Material Grades & Specifications
| Grade Standard | Typical Grades | Hardness Range (HRC) | Thickness (mm) | Width (mm) |
|---|---|---|---|---|
| DIN / EN | CK67, CK75, CK80 | 30–55 (H&T) / ≤180 HV (Annealed) | 0.10 – 5.5 | 3 – 550 |
| AISI / SAE | 1065, 1074, 1075 | 30–55 (H&T) / ≤180 HV (Annealed) | 0.10 – 5.5 | 3 – 550 |
| JIS | SUP3, SUP6, SUP7 | 30–55 (H&T) / ≤180 HV (Annealed) | 0.10 – 5.5 | 3 – 550 |
| Alloy Grades | 50CrV4, 60Si2Mn, 51CrV4 | 35–55 (H&T) | 0.20 – 5.0 | 10 – 500 |
Common Applications in Automotive Industry
- Suspension Systems: Coil springs, leaf springs, stabilizer bars
- Transmission & Clutch: Clutch diaphragm springs, shift fork springs
- Seating & Interior: Seat adjustment springs, lumbar support springs
- Engine & Valve Train: Valve springs, fuel injection springs
- Braking Systems: Parking brake springs, brake pad retention clips
- Electrical & Connectors: Battery contact springs, connector springs
Production Process
- Material Selection – Prime steel coils sourced from ISO‑certified mills
- Cold Rolling – Precision thickness reduction and width control
- Heat Treatment –
- Annealing: Spheroidize or bright annealing for formability
- Quenching & Tempering: Oil or molten salt quenching followed by tempering for strength and toughness
- Surface & Edge Treatment – Polishing, rounding, slitting, decambering
- Quality Inspection – Chemistry analysis, hardness testing, flatness check, tensile test, metallographic examination
Technical Advantages
| Property | CgoodSteel Standard | Industry Typical |
|---|---|---|
| Flatness Tolerance | ≤0.2% (Class P3) | ≤0.3–0.4% |
| Hardness Deviation | ±2 HRC | ±3–4 HRC |
| Decarburization Depth | ≤1% of thickness | ≤1.5% of thickness |
| Surface Roughness (Ra) | ≤0.8 µm (polished) | ≤1.2 µm |
| Edge Condition | Burr‑free, rounded or square as specified | Light burr acceptable |
Ordering & Customization
We support tailored solutions based on your component design and production process:
- Custom hardness profiles (gradient or uniform)
- Special surface finishes – bright, blue, yellow, polished, coated
- Precision slitting & edge preparation – round, square, slit, deburred
- Pre‑cut blanks or continuous coils
- Packaging – oil‑paper interleaving, waterproof film, wooden pallets
Minimum Order Quantity: Flexible, from pilot batches to full‑scale supply.
Quality Assurance
- Raw material traceability
- In‑house lab testing (Rockwell/Brinell hardness tester, tensile machine, spectrometer, metallurgical microscope)
- Compliance with DIN, EN, AISI, JIS, GB and customer‑specific standards
- Mill test certificates provided with each shipment
Why Choose CgoodSteel?
✅Over 20 years of spring steel specialization
✅Direct manufacturer with full process control
✅Fast response & engineering support
✅Competitive pricing with consistent quality
✅Just‑in‑time delivery capability
Contact Us for Quotes & Technical Data Sheets
Have a specific application or drawing?
Send us your requirements for a tailored material recommendation and sample availability.
