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Composition of 304 stainless steel bearings
(1) Osfield stainless steel
This is the type of 304 stainless steel that is most commonly seen in normal times. Its standard composition is 18% chromium plus 8% nickel, which is commonly referred to as 18-8 stainless steel. The characteristics of this kind of stainless steel are non-magnetic, can not change its metallographic structure by heat treatment, and have good processability. Because of the alloying element-nickel, the corrosion resistance is better than that of chromium only. The other two types of stainless steel. The main uses of 300 series stainless steel are: general household use such as kitchen utensils, building materials, medical and health equipment, food processing materials, vehicles, chemical equipment and pipe fittings, mechanical equipment and parts. In the eyes of ordinary people, the so-called stainless steel refers to 300 series stainless steel (especially refers to 304 stainless steel).
(2) Ma Tian San stainless steel
The representative steel of this type of stainless steel is 410, and its chemical composition contains 13% chromium, 0.15% or less of carbon and a small amount of other elemental alloys. The raw material is cheaper, magnetic, hardened by heat treatment, and increased in strength. However, because it does not contain nickel, its corrosion resistance is inferior to that of ordinary 304 stainless steel, so it can only be used in mildly corrosive environments. General uses include bearings, medical equipment and tools.
(3) Fermentation stainless steel
The representative steel grade of this type of stainless steel is 430, its standard chemical composition is 16-18% chromium, and its carbon content is low. This type of stainless steel is magnetic, and if the stainless steel sheet we see can be attracted by the magnet, it is likely to belong to this type of stainless steel. Because it is nickel-free and cheaper, typical uses include kitchen utensils, weaving nets and accessories.
(4) Precipitation hardened stainless steel
The American Iron and Steel Institute AISI is numbered 600 series stainless steel. In addition to chromium and nickel, these stainless steels contain precipitation hardening elements such as copper, aluminum and titanium, which harden the material and increase its strength. Typical applications for this type of stainless steel are: valve components, motor shafts, petrochemical equipment, and golf club heads.
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