Compared with ordinary bearings, stainless steel bearings not only have obvious advantages in material quality, but also have much stricter control in technology and accuracy compared to ordinary bearings. Below, we will introduce the materials of stainless steel bearings.

According to composition, it can be divided into Cr series (SUS400), Cr Ni series (SUS300), Cr Mn Ni series (SUS200), and precipitation hardening (SUS600).

200 Series - Chromium Nickel Manganese Austenitic Stainless Steel

300 Series - Chromium Nickel Austenitic Stainless Steel

301- Good ductility, used for forming products. It can also be hardened by machine speed. Good weldability. The wear resistance and fatigue strength are better than 304 stainless steel.

302- The corrosion resistance is the same as 304, and the strength is better due to the relatively high carbon content.

303- By adding a small amount of sulfur and phosphorus to make it easier to machine.

304- i.e. 18/8 stainless steel. The GB brand is 0Cr18Ni9.

309- has better temperature resistance compared to 304.

316- The second most widely used steel grade after 304, mainly used in the food industry and surgical equipment, with the addition of molybdenum to obtain a special corrosion-resistant structure. Due to its better resistance to chloride corrosion compared to 304, it is also used as a "marine steel". SS316 is commonly used in nuclear fuel recovery devices. Grade 18/10 stainless steel usually also meets this application level.

321- Except for reducing the risk of material weld corrosion due to the addition of titanium element, other properties are similar to 304.

400 Series - Ferritic and martensite Stainless Steels

408- Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.

409- The cheapest model (British and American), usually used for automotive exhaust pipes, is a ferritic stainless steel (chromium steel).

410 - martensite (high-strength chromium steel), with good wear resistance and poor corrosion resistance.

416- The addition of sulfur improves the processing performance of the material.

420 - "cutting tool grade" martensite steel, similar to Brinell high chromium steel, the earliest stainless steel. It is also used for surgical knife, which can be made very bright.

430- Ferritic stainless steel, for decorative purposes, such as in automotive accessories. Good formability, but poor temperature and corrosion resistance.

440- High strength cutting tool steel, with slightly higher carbon content, can achieve higher yield strength after appropriate heat treatment, and its hardness can reach 58HRC-62HRC, making it one of the hardest stainless steels. The most common application example is "bearings". There are three commonly used models: 440A, 440B, 440C, and also 440F (easy to process).

500 series - heat-resistant chromium alloy steel.

600 series - martensite precipitation hardening stainless steel.

630- The most commonly used precipitation hardening stainless steel model, usually also known as 17-4; 17%Cr，4%Ni。