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What is the difference between stainless steel bearing 304 and 440 material?

Update:14-09-2020
Summary:

Stainless steel bearings are now divided into three mat […]

Stainless steel bearings are now divided into three materials: 440, 304, and 316. The first two are the more common stainless steel bearings. The 440 material is definitely magnetic, which means that the magnet can be absorbed. 304 and 316 belong to micro-magnetism (many people say that it is not correct that he has no magnetism), that is, the magnet cannot be absorbed, but you can feel a little suction. Generally, stainless steel bearing seats are made of 304 material. So the stainless steel bearing seat is made of 304 or 440? 304 is the most used stainless steel. Compared with 440, the price will be lower in terms of corrosion resistance and mechanical properties. The comprehensive performance is more comprehensive, so it is more commonly used. But the disadvantage is that it cannot be further heat treated to change its performance. 440 is a high-strength cutting tool steel (with A, B, C, F, etc. in the end). After proper heat treatment, a higher yield strength can be obtained, and it is among the hardest stainless steels. The most common application example is "razor blades".

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