Spring Materials Specifications & Mechanical Data

Comparative engineering analysis of standard carbon steels, austenitic stainless alloys, chrome-vanadium tool steels, and high-temperature nickel superalloys.

Material Grades & Physical Properties

Selection of spring alloy fundamentally dictates load retention, thermal operating ceiling, and service fatigue life.

SUS304 Stainless Steel

AISI 304 / 1.4301 / 18-8

The most widely used austenitic stainless spring wire. Outstanding atmospheric corrosion resistance, ideal for food processing, medical devices, and cleanroom equipment.

Medical Devices

Food Machinery

Marine Hardware

Chemical Processing

Tensile Strength: 515–760 MPa

Yield Strength: 205 MPa

Elongation: 40%

Operating Temp: −200°C ~ +300°C

Corrosion Resistance: Excellent

Relative Cost: Moderate

SUS316 Stainless Steel

AISI 316 / 1.4401 / 18-10 Mo

Molybdenum-alloyed austenitic stainless steel providing superior resistance to pitting, chlorides, seawater, and severe chemical media.

Marine Subsea

Pharmaceutical Equipment

Offshore Platforms

High-Chloride Media

Tensile Strength: 515–760 MPa

Yield Strength: 205 MPa

Elongation: 40%

Operating Temp: −200°C ~ +400°C

Corrosion Resistance: Superior

Relative Cost: High

SWP-B Music Wire

JIS G 3522 / ASTM A228 High Carbon

Premium cold-drawn high-carbon spring wire delivering the highest tensile strength, exceptional elastic limit, and outstanding fatigue cycle life for precision mechanisms.

Automotive Components

Industrial Machinery

Electronics

Precision Actuators

Tensile Strength: 1400–2200 MPa

Yield Strength: 1120 MPa

Elongation: 20%

Operating Temp: −40°C ~ +120°C

Corrosion Resistance: Fair (Plating Advised)

Relative Cost: Low

SWC Oil-Tempered Carbon Steel

Oil-Quenched & Tempered

Uniformly heat-treated oil-tempered spring steel offering superior resistance to stress relaxation, high yield-to-tensile ratio, and consistent coil forming.

High-Load Heavy Springs

Engine Valve Springs

Seat Mechanisms

Hydraulic Valves

Tensile Strength: 1500–2400 MPa

Yield Strength: 1300 MPa

Elongation: 15%

Operating Temp: −40°C ~ +180°C

Corrosion Resistance: Fair (Plating Advised)

Relative Cost: Low

50CrV4 / 51CrV4 Alloy Steel

AISI 6150 / 1.8159 Cr-V Steel

Chrome-vanadium alloy steel engineered for extreme cyclic shock loading, high dynamic fatigue resistance, and elevated operating temperatures.

Automotive Suspension

Heavy Die Springs

Railway Dampers

High-Performance Tooling

Tensile Strength: 1100–1300 MPa

Yield Strength: 950 MPa

Elongation: 12%

Operating Temp: −40°C ~ +300°C

Corrosion Resistance: Fair (Coating Required)

Relative Cost: Moderate

Inconel X-750 Superalloy

UNS N07750 / 2.4669 Nickel Superalloy

Precipitation-hardenable nickel-chromium superalloy retaining exceptional mechanical properties, creep resistance, and non-magnetic stability at extreme temperatures.

Aero Gas Turbines

Nuclear Core Control Rods

Rocket Engines

Subsea Oil & Gas

Tensile Strength: 1100–1250 MPa

Yield Strength: 750 MPa

Elongation: 25%

Operating Temp: −200°C ~ +650°C

Corrosion Resistance: Extreme

Relative Cost: Very High

Metallurgical Selection Guidelines

• General industrial mechanisms: SWP-B music wire provides the most economical high-cycle life.
• Wet, humid, or medical environments: SUS304 or molybdenum-alloyed SUS316 stainless steels are recommended.
• High-temperature operations (> 200°C): 50CrV4 alloy steel or Inconel series prevent load relaxation.
• Contact TOSTA metallurgists for customized alloy recommendations and stress corrosion analysis.

Need Metallurgical Advice for Severe Environments?

TOSTA materials engineers can recommend optimal alloys to prevent hydrogen embrittlement, stress corrosion cracking, or thermal relaxation.

Contact Materials Specialist Mr. Wang +86 130-1246-1618