400 series - Ferritic and martensitic stainless steel

408, good heat resistance, low corrosion resistance, 11% Cr, 8% Ni.

409 - the most inexpensive models (England), usually used in automobile exhaust pipe, is a ferritic stainless steel (steel).

410 - martensite (high strength steel), good wear resistance, corrosion resistance is poor.

416 - sulfur added to improve the processing properties of materials.

420 - "cutting class" martensitic steel, similar Brinell first high-chromium stainless steel this. Also used in surgical operation tools, can do very light.

430 - ferritic stainless steel, decorative, such as for car accessories. Good shape, but heat resistance and corrosion resistance is worse.

440 - high strength cutting tool steel, carbon slightly higher, after appropriate heat treatment to obtain a higher yield strength, hardness can reach 58HRC, belongs to the most hard stainless steel column. The most common application example is the "razor blade". There are three common models: 440A, 440B, 440C, and 440F (easy processing).

500 series - resisting chromium alloy steel.

600 series of Martensite Precipitation Hardening Stainless steel.

630 - the most commonly used precipitation hardening stainless steel type, also known as 17-4 17%Cr, 4%Ni.