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The composition of the stainless steel bearing

Generally in accordance with its microstructure can be divided into five categories:
(a) the field of stainless steel
Often see 304 stainless steel is the most at ordinary times, its standard components is 18% chromium and 18% nickel, generally, the term "18 8 stainless steel. The characteristics of this kind of stainless steel is non-magnetic, unable to borrow by heat treatment to change its metallographic structure, good processability, and because it contains - nickel alloy element, so the corrosion resistance is superior to the only containing chromium (excluding nickel) of the other two kinds of stainless steel. 300 series stainless steel main purposes are: the general purpose of the people's livelihood, such as kitchen utensils, building materials, medical equipment, food processing materials, transportation, chemical industry equipment and pipe fittings, mechanical equipment and parts. In the minds of ordinary people, the so-called stainless steel is refers to the 300 series stainless steel, etc. (especially refers to the 304 stainless steel).
(2) department of martensitic stainless steel
Representative of this kind of stainless steel 410, and its chemical composition containing 13% chromium, less than 0.15% of carbon and alloy small amounts of other elements. Raw material price is cheaper, magnetism, heat treatment hardening, can increase the intensity. But because do not contain nickel, its corrosion resistance worse from general 304 stainless steel, so it can only be used for mild corrosive environment. General purpose such as bearings, medical appliance and tools.
(3) department of ferritic stainless steel
Representative of this kind of stainless steel 430, the standard chemical composition of 16 ~ 18% chromium, carbon content is low. This kind of stainless steel with magnetic, if we can see the stainless steel plate can be magnet adsorption, are likely to belong to this kind of stainless steel. By excluding nickel price is inexpensive, typical application such as kitchen utensils, netting and accessories.
(4) precipitation hardening stainless steel
The American association of steel AISI number 600 series stainless steel. This kind of stainless steel in addition to containing chromium and nickel, also contain precipitation hardening elements such as copper, aluminum and titanium, make the material hardening, strength to rise. Typical USES for this type of stainless steel, valves, motor axis, petrochemical equipment, and golf first class.
(5) duplex stainless steel
This kind of typical steel grade of stainless steel 2205, or 22% chromium and 5% nickel. Features of this kind of steel is: intensity better (far better than the 304) corrosion resistance, so commonly used in petrochemical industry pipeline, pressure vessel and spindle, etc. 304 grades of stainless steel chemical composition is 0 cr18ni9

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