About Stainless Steel
Stainless steel is often divided into martensitic steel, ferritic steel, austenitic steel, austenitic-ferritic (duplex) stainless steel and special stainless steel according to its organizational state. In addition, it can be divided into chromium stainless steel, chromium-nickel stainless steel and chromium-manganese nitrogen stainless steel according to the composition. Austenitic stainless steel The chromium content is greater than 18%, and it also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good comprehensive performance, can resist a variety of media corrosion. Common grades of austenitic stainless steel are 1Cr18Ni9, 0Cr19Ni9, etc. The Wc of 0Cr19Ni9 steel is less than 0.08%, marked as "0" in the steel number. This type of steel contains a lot of Ni and Cr, which makes the steel austenitic at room temperature. This kind of steel has good plasticity, toughness, weldability, corrosion resistance and non-magnetic or weak magnetism, corrosion resistance in oxidizing and reducing media are good, used to make acid-resistant equipment, such as corrosion-resistant containers and equipment linings, transportation pipelines, nitric acid resistant equipment parts, etc., in addition to being used as the main material of stainless steel watch jewelry. Austenitic stainless steel generally adopts solution treatment, that is, the steel is heated to 1050~1150 °C, and then water-cooled or air-cooled to obtain a single-phase austenitic structure. Special stainless steel Special stainless steel refers to a high-alloy stainless steel containing high nickel, high chromium and high molybdenum in chemical composition. Compared with ordinary stainless steel, special stainless steel has better high temperature resistance or corrosion resistance.