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The difference and function of stainless steel bearing 304 and 440 materials
Stainless steel bearings are now divided into four materials: 440, 304, 316, and 420. The first two are more common stainless steel bearings. The 440 material is definitely magnetic, that is, the magnet can absorb it.
304 and 316 are micro-magnetic (many people say that he is not magnetic, which is incorrect), that is, the magnet cannot absorb, but you can feel a little suction. 420 stainless steel is 420 "knife grade" martensitic steel, the earliest stainless steel similar to cloth high zirconium steel. Generally, stainless steel bearing seats are made of 304 material, so is the material of stainless steel bearing seats 304 or 440? 

1. The difference between 304 stainless steel bearings and 440 stainless steel bearings

2. (1) 304 is the most commonly used grade of stainless steel. It belongs to austenitic stainless steel and has no magnetism. It mainly contains Cr and Ni, and the contents are 18% and 8% respectively.
   304 is a commonly 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 widely used. But the disadvantage is that it cannot be further heat treated to change its properties.

3. (2) 440 stainless steel has a high C content, and its hardness is among the highest among all stainless steels. It is usually used for knives, and its corrosion resistance is worse than that of 304. 440 is a high-strength cutting tool steel (endnotes are A, B, C, F, etc.), which can obtain a higher yield strength after proper heat treatment, and belongs to the list of hard stainless steels. A common application example is "razor blades".
   The corrosion resistance of 304 stainless steel bearings is superior. 304 stainless steel is a grade of stainless steel produced according to the American ASTM standard. 304 is equivalent to my country's 0Cr19Ni9 (0Cr18Ni9) stainless steel. 304 contains 19% chromium and 9% nickel. 304 is the most widely used stainless steel and heat-resistant steel. Used in food production equipment, Xitong chemical equipment, nuclear energy, etc.

4. 2. What are the functions of 304 and 440 stainless steel bearings

5. 2.1, the role of 304 stainless steel shaft
   304 stainless steel is the most widely used steel type, with good corrosion resistance, heat resistance, low temperature strength and mechanical properties. It has good processing performance at room temperature such as deep drawing and bending, and will not harden after heat treatment. Suitable for high or even very high rpm operation, they are extremely durable and require little maintenance.
   This type of bearing has small friction coefficient, high limit speed, simple structure, low manufacturing cost and easy to achieve high manufacturing precision. The size range and form vary, and they are widely used in precision instruments, low-noise motors, automobiles, motorcycles and general machinery industries. They are widely used in the machinery industry.

6. 2.2 The role of 440 stainless steel bearings
   440 stainless steel is a martensitic stainless steel. 440 has good high-temperature dimensional temperature resistance and can be used as a corrosion-resistant high-temperature bearing steel. It is mainly used in the manufacture of bearing parts working in corrosive environments and non-lubricated strong oxidizing atmospheres. 440 has good high-temperature dimensional stability, so it can also be used as corrosion-resistant high-temperature bearing steel.
   In addition, it can also be used to manufacture high-quality knives, such as medical scalpels, scissors, nozzles, bearings, etc. The ability of 440C to bear dynamic load is low, and its corrosion resistance is worse than that of 304.

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