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.


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

       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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