The material of a spring determines almost everything about its performance: load capacity, fatigue life, corrosion resistance, working temperature and cost. Choosing the right spring material early in the design process saves both money and field failures. Here is a practical guide to the most common spring materials and when to use each.
Carbon Spring Steel (SAE 1060-1095, EN 10270-1)
Carbon spring steel is the workhorse of the industry. It offers high strength at a low cost and is perfectly adequate for most industrial applications at normal temperatures in non-corrosive environments.
- Best for: general mechanical springs, automotive components, railway fittings, tools
- Tensile strength: very high after heat treatment
- Limits: poor corrosion resistance, limited to about 120–150 °C continuous service
- Common finishes: oil-tempered, hard-drawn, pre-galvanized wire
Alloy Spring Steel (Chrome-Vanadium, Chrome-Silicon, EN 10270-2)
When the job gets harder — higher stress, impact loads, elevated temperatures — alloy steels take over. Chrome-vanadium (e.g. 51CrV4) resists fatigue and impact well; chrome-silicon (e.g. 55SiCr) handles higher stresses and temperatures up to about 250 °C.
- Best for: engine valves, suspension springs, heavy-duty mechanisms, mining and railway equipment
- Advantage: longer fatigue life at higher working stresses
- Cost: higher than plain carbon steel — justified where reliability matters
Stainless Steel (302/304, 316, 17-7PH, EN 10270-3)
Stainless springs are the standard answer for corrosion and hygiene requirements. Grade 302/304 is the everyday choice; 316 adds resistance to chlorides and marine environments; precipitation-hardened 17-7PH delivers strength closer to carbon steel while keeping corrosion resistance.
- Best for: food and beverage, medical, marine, chemical, outdoor and humid environments
- Watch out: lower strength than carbon steel at the same wire diameter — plan for a thicker wire or larger envelope
- Magnetic properties: 302/304 are slightly magnetic after forming; 316 nearly non-magnetic
Copper-Based Alloys (Phosphor Bronze, Beryllium Copper)
Copper alloys bring electrical conductivity, corrosion resistance and non-sparking behavior. Beryllium copper is the premium choice for connectors and current-carrying springs; phosphor bronze is a budget-friendly alternative.
- Best for: electrical contacts, switches, instruments, marine hardware
- Note: beryllium copper requires careful handling during manufacture — use a supplier with the right processes
High-Temperature Alloys (Inconel, Nimonic, 17-7PH)
For service above 250 °C, standard steels lose their spring properties. Nickel-based alloys such as Inconel X-750 keep useful strength up to 600 °C and are used in turbines, exhaust systems and heat treatment fixtures.
Decision Table
| Requirement | Recommended material |
|---|---|
| Lowest cost, normal conditions | Carbon spring steel |
| High fatigue / impact / up to 250°C | Chrome-vanadium or chrome-silicon alloy steel |
| Corrosion or hygiene environment | Stainless steel 302/304/316 |
| Electrical conductivity | Beryllium copper / phosphor bronze |
| Above 250°C continuous | Nickel-based alloys |
Finishing and Protection
The surface is where springs fail. Shot peening dramatically improves fatigue life, and protective finishes — zinc plating, Dacromet, powder coating or oiling — decide how long the spring survives outdoors. Always tell your supplier what the spring will be exposed to; a few grams of the right coating can add years of service.
Chenji manufactures springs in carbon steel, alloy steel and stainless steel, with shot peening, plating and powder coating available in-house or through qualified partners. Send us your working conditions and we will propose the most economical material that meets them. Request a quotation, or explore our spring product range.