Stainless steel spring wire

Stainless steel spring wire is a high-performance wire designed specifically for making springs. It achieves excellent elasticity and durability through component optimization and special processing technology.

Core features of stainless steel spring wire :

1. Ultra-high strength and elastic limit

- Through cold drawing hardening or aging treatment, the tensile strength can reach 1500-2200 MPa, and the elastic limit is high (≈70% of the tensile strength), ensuring that the spring will not produce permanent deformation during repeated deformation.

2. Excellent fatigue resistance

- High purity smelting (such as VIM vacuum melting) reduces impurities, and combined with surface shot peening, significantly improves cycle life (>10⁶ times).

3. Corrosion resistance (key advantage)

- Common materials:

- 302/304: general purpose, resistant to atmospheric corrosion (automobiles, furniture).

- 316/316L: Contains molybdenum, resistant to chloride corrosion (marine, chemical environment).

- 17-7PH/631: precipitation hardening type, combining high strength and corrosion resistance (aerospace).

- Inconel X-750: Nickel-based alloy, resistant to high temperature corrosion (turbine engine springs).

4. High and low temperature resistance

- Austenitic stainless steel (304/316) is suitable for -200℃~400℃;

- Precipitation hardening steel (17-7PH) with temperature resistance up to 600°C;

- Nickel-based alloys (Inconel) can be used in 800°C environments for a long time.

5. Low magnetism/non-magnetism

- Austenitic stainless steel (304/316) is non-magnetic after solution treatment and is suitable for sensitive equipment such as electronics and medical.

       Stainless steel spring wire                                                    Stainless steel spring wire                                            Stainless steel spring wire

Key production technology of stainless steel spring wire

1. Ingredient control:

- Strictly limit the C content (below 0.08%) to prevent intergranular corrosion, and add Cr/Ni/Mo to improve corrosion resistance.

2. Drawing hardening:

- Multi-pass cold drawing (reduction ratio ≥ 80%) forms a dislocation strengthening structure and improves strength.

3. Heat treatment:

- Austenitic steel: solution treatment (quenching at 1050℃) → stress relief annealing (250-400℃).

- Precipitation hardening steel: solution treatment → cold deformation → aging (480-560℃) → precipitation strengthening phase.

4. Surface optimization:

- Polishing/honing: Reduce surface defects and reduce fatigue crack sources.

- Shot peening: introduces a compressive stress layer and increases fatigue strength by more than 30%.

Core application areas of stainless steel wire

Industrial Equipment

Transportation

Medical and precision instruments

Energy and Electronics

Key parameters for selecting stainless steel spring wire