Common stainless steel bearing materials
(1) Ostian system stainless steel---304 stainless steel
Many of the stainless steel household tools that can be seen everywhere in life are 304 stainless steel. Its standard chemical composition is 19% chromium plus 8% nickel, which is commonly referred to as 19-8 stainless steel. The characteristics of this type of stainless steel are that it is non-magnetic and cannot change its metallographic structure and process performance through heat treatment processes; and because it contains nickel as an alloying ingredient, its corrosion resistance is better than the other two categories that only contain chromium and no nickel. Stainless steel. The main uses of 300 series stainless steel are: general civil engineering uses such as kitchen utensils, decorative building materials, medical equipment, food processing machinery, transportation vehicles, chemical machinery and pipes, industrial equipment and parts.
In short, 304 stainless steel is used to make stainless steel bearings and has good anti-rust properties. However, because the bearing cannot be heat treated, its hardness is softer than bearing steel or 400 series stainless steel and it is easy to wear. However, because they contain relatively large amounts of chromium and nickel, the cost of such materials is relatively high. It is suitable for occasions with high requirements for rust prevention, but it cannot withstand excessive load and high speed. Domestic grades of stainless steel such as 304 are usually called: 0Cr18Ni9
(2) Asada loose series stainless steel
The common steel type of this type of stainless steel is 410, whose chemical composition contains 13% chromium, less than 0.15% carbon and a certain amount of other alloy elements. The raw material cost is relatively cost-effective, it is magnetic and can be hardened through heat treatment. However, because it does not contain nickel, its corrosion resistance is relatively worse than that of 304 stainless steel, so it can only be used in mildly corrosive environments. Usually the main uses include bearings, medical equipment and CNC blades, etc. 410 domestic brand is usually called: 1Cr13
(3) Fertilizer grain stainless steel
The common steel grades of this type of stainless steel are 430 or 440, whose standard chemical composition is 16~19% chromium and low carbon content. This type of stainless steel is magnetic. It is cheaper because it does not contain nickel. Typical uses include kitchen utensils, netting and jewelry. 430 domestic brand is usually called: 1Cr17; 440 domestic brand is usually called: 9Cr18
(4) Duplex stainless steel
A typical grade of this type of stainless steel is 2205, which is 22% chromium and 5% nickel. The characteristics of this type of steel are: high hardness, much better than 304 steel, and good corrosion resistance. Therefore, it is often used in petrochemical industry pipelines, pressure vessels, mandrels, etc.
Performance of stainless steel bearings
Thrust bearings are dynamic pressure bearings. In order for the bearings to operate normally, they should meet the following standards:
1. Lubricating oil has a viscosity;
2. Moving and static bodies have corresponding relative motions with each other;
3. The two surface layers in relative motion are deflected to generate an oil wedge;
4. The external load is within the specification standards;
5. Plenty of oil. In order to ensure the stable operation of the turbine, bearing temperature is an indispensable detection item. Stainless steel bearings use the method of measuring the temperature of the thrust tile to detect the bearing temperature on the tile.
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