What is the difference between stainless steel bearings 304 and 440?

AISI 304 stainless steel ball bearing is a type of chromium nickel stainless steel with good resistance to intergranular corrosion and corrosion resistance, widely used in food processing, pharmaceuticals, cosmetics, chemical and other fields. Stainless steel bearing 440 is a high carbon stainless steel that can be heat treated to improve strength and hardness, and has good wear resistance and high-temperature oxidation resistance.

The material composition of stainless steel bearing 304 is 18% chromium and 8% nickel, containing low-carbon components. This material has a relatively low cost and high corrosion resistance. Stainless steel bearing 440 contains 17% chromium and a large amount of carbon, which is slightly more expensive, but its hardness and strength also increase accordingly.

Stainless steel bearing 304 is suitable for low temperatures or normal usage environments. Stainless steel bearing 440 is suitable for use in high temperatures or harsh working environments.

Overall, stainless steel bearings 304 and 440 have excellent corrosion resistance and mechanical properties to a certain extent. So, when selecting bearing materials, it is necessary to consider various aspects such as specific working environment and requirements, and then choose suitable bearing materials.