Stainless steel material is usually divided into the following:

1, ferritic stainless steel. Chromium 12% to 30%. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its resistance to chloride stress corrosion is superior to other types of stainless steel.

2, austenitic stainless steel. Chromium is more than 18%, also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements, the overall performance is good, resistant to a variety of media corrosion.

3, austenitic-ferritic duplex stainless steel. It combines the advantages of austenitic and ferritic stainless steels and has superplasticity.

4, martensitic stainless steel. High strength but poor plasticity and weldability.