Spring material 301 and 304 stainless steel


SUS301 (stainless steel spring): The Cr (chromium) component is lower than SUS304 spring, and its corrosion resistance is poor, but cold working can achieve a very high degree of stretch and hardness. It is often widely used in laptops to prevent electromagnetic interference, as an elastic contact part, but the total thickness is between 0.4t and 0.07t. The number of series must be specified to meet the design requirements (such as elasticity, strength). Also note that material 301 has metallic crystallinity and directionality. The higher the number, the harder and more brittle it is. and side cracks.

Spring material 301 and 304 stainless steel

Stainless steel spring

Material properties

SUS 301 : suitable for elastic use, high carbon content, high hardness, not susceptible to elastic fatigue, poor ductility, not easy to stretch SUS 304 : not suitable for elastic use, low carbon content, low hardness (soft) SUS 430: The material contains more impurities (impurities), resulting in unstable hardness.


1. If the hardness of two parts is close, for example (SUS301 3/4H and SUS304 H), although the hardness is the same, SUS 304 H is more prone to elastic fatigue when used on elastic products.< /p>

2. The thickness of the material affects the hardness tolerance (the thicker the greater the tolerance).

SUS 301: the surface is hazy, the magnetism is weaker than 430, strong corrosion resistance, good elasticity, not easy to fatigue, suitable for cold working, has hardness requirements, hardness is proportional to elasticity, used for shrapnel and high strength requirements Brackets, panels etc.

SUS 304: non-magnetic, strong corrosion resistance, good elasticity, no obvious thread guidance, good cold working effect, deep drawing resistance and hardness difference. This material is divided into 2B surface and AB surface, that is, matte surface and mirror surface For brackets, connectors and utensils, etc.