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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.
PRODUCT DESCRIPTION
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
Application Scenario | Typical spring types | Material selection | Performance requirements |
Valve seal | Compression spring | 316L, Inconel 718 | High pressure corrosion resistance, creep resistance |
Oil drilling tools | Disc spring | 17-7PH, 15-5PH | H₂S corrosion resistance, high load |
Chemical pumps and valves | Bellows Spring | Hastelloy C276 | Strong acid resistance and intergranular corrosion resistance |
Transportation
Application Areas | Spring Type | Material | characteristic |
car | Valve springs, suspension springs | 302HQ, 17-7PH | Long fatigue life, lightweight |
Rail Transit | Shock absorber spring | 631 (17-7PH) | Vibration and shock resistance, long life |
Aerospace | Actuator spring | Inconel X-750 | Resistant to 650℃ high temperature, low relaxation |
Medical and precision instruments
Implantable Devices | Spring Type | Material | characteristic |
Implantable Devices | Vascular stent spring | 316LVM (vacuum melting) | Ultra-pure and biocompatible |
Surgical Robot | Micro coil spring | 304 (Ø0.03mm) | Super elastic, non-magnetic |
Optical instruments | Focus mechanism spring | 304, non-magnetic treatment | Precision elasticity, anti-creep |
Energy and Electronics
Device Type | Spring name | Material | characteristic |
nuclear power plant | Control rod drive spring | Inconel 718 | Radiation and stress corrosion cracking resistant |
Fuel Cells | Sealing diaphragm spring | 316L, platinum plated | Hydrogen embrittlement resistance, electrical conductivity |
Semiconductor Equipment | Probe Card Spring | BeCu/304 composite | Ultra-low contact resistance, high elasticity |
Key parameters for selecting stainless steel spring wire
mm | Packing | Tensile Strength MPa |
0.50 | 10-20 kg/coil | 2070 - 2275 |
0.80 | 50 kg/coil | 1945 - 2135 |
1.00 | 50 kg/coil | 1895 - 2095 |
1.50 | 50 kg/coil | 1780 - 1965 |
1.75 | 50 kg/coil | 1735 - 1935 |
2.50 | 50 kg/coil | 1670 - 1870 |
3.00 | 50 kg/coil | 1530 - 1745 |
4.00 | 50 kg/coil | 1415 - 1620 |
6.00 | 50 kg/coil | 1205 - 1415 |
Chemical Compsition % | ||||||||||
TYPE | C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Others |
316 | 0.08 | 1.00 | 2.00 | 0.045 | 0.03 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 | - | - |
302 | 0.15 | 1.00 | 2.00 | 0.045 | 0.03 | 8.0-10.0 | 17.0-19.0 | - | - | - |
304 | 0.08 | 1.00 | 2.00 | 0.045 | 0.03 | 8.0-10.0 | 18.0-20.0 | - | - | - |
304H | 0.04-0.10 | 1.00 | 2.00 | 0.045 | 0.03 | 8.0-10.0 | 18.0-20.0 | - | - | - |
321 | 0.08 | 1.00 | 2.00 | 0.045 | 0.03 | 9.0-13.0 | 17.0-19.0 | - | - | Ti≥5*C% |
347 | 0.1 | 1.00 | 2.00 | 0.045 | 0.03 | 9.0-13.0 | 17.0-19.0 | - | - | Nb: 8C-1.10 |
631(J1) | 0.09 | 1.00 | 1.00 | 0.040 | 0.03 | 6.5-8.5 | 16.0-18.0 | - | - | Al: 0.75-1.5 |
NOTE: The single value represents the max. (Above tables) | ||||||||||
Delivery condition and mechanical properties follow JIS/ASTM/DIN/GB standard |
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