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Automotive spring steel strip

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Steel Classification

Automotive spring steel strip

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.

Automotive Spring Steel Strip

Automotive spring steel strip

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 StandardTypical GradesHardness Range (HRC)Thickness (mm)Width (mm)
DIN / ENCK67, CK75, CK8030–55 (H&T) / ≤180 HV (Annealed)0.10 – 5.53 – 550
AISI / SAE1065, 1074, 107530–55 (H&T) / ≤180 HV (Annealed)0.10 – 5.53 – 550
JISSUP3, SUP6, SUP730–55 (H&T) / ≤180 HV (Annealed)0.10 – 5.53 – 550
Alloy Grades50CrV4, 60Si2Mn, 51CrV435–55 (H&T)0.20 – 5.010 – 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

  1. Material Selection – Prime steel coils sourced from ISO‑certified mills
  2. Cold Rolling – Precision thickness reduction and width control
  3. Heat Treatment –
    • Annealing: Spheroidize or bright annealing for formability
    • Quenching & Tempering: Oil or molten salt quenching followed by tempering for strength and toughness
  4. Surface & Edge Treatment – Polishing, rounding, slitting, decambering
  5. Quality Inspection – Chemistry analysis, hardness testing, flatness check, tensile test, metallographic examination

Technical Advantages

PropertyCgoodSteel StandardIndustry 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 ConditionBurr‑free, rounded or square as specifiedLight 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.

Note: All products are manufactured in compliance with international medical material standards. Custom widths, slitting, packaging, and surface treatments available upon request.

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