What is Stainless Steel?

Stainless steel is generally a general term for stainless steel and acid-resistant steel. Stainless steel refers to steel that is resistant to corrosion by weak media such as atmosphere, steam and water, while acid-resistant steel refers to steel that is resistant to chemical corrosive media such as acid, alkali, and salt. Stainless steel has been around for more than 90 years since it came out at the beginning of this century. The invention of stainless steel is a major achievement in the history of world metallurgy. The development of stainless steel has laid an important material and technological foundation for the development of modern industry and scientific and technological progress. There are many types of stainless steel with different properties. It has gradually formed several categories in the development process. According to the structure, it is divided into four categories: martensitic stainless steel (including precipitation hardening stainless steel), ferritic stainless steel, austenitic stainless steel and austenitic plus ferritic duplex stainless steel; Chemical composition or some characteristic elements in steel are classified into chromium stainless steel, chromium-nickel stainless steel, chromium-nickel-molybdenum stainless steel, low-carbon stainless steel, high-molybdenum stainless steel, high-purity stainless steel, etc.; Nitric acid-resistant stainless steel, sulfuric acid-resistant stainless steel, pitting-resistant stainless steel, stress corrosion-resistant stainless steel, high-strength stainless steel, etc; At present, the commonly used classification method is to classify according to the structural characteristics of steel and the characteristics of chemical composition of steel, as well as the combination of the two. Generally divided into martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel and precipitation hardening stainless steel, etc., or divided into two categories: chromium stainless steel and nickel stainless steel. Tianjin Huatai Tengfei Steel Trading Co., Ltd. Stainless steel is generally used in anti-corrosion environments, as well as medical equipment and daily necessities.

According to the main chemical composition, it is divided into chromium stainless steel, chromium-nickel stainless steel and chromium-manganese-nitrogen stainless steel, etc.; it can also be divided into acid-resistant stainless steel and heat-resistant stainless steel according to its performance characteristics; it is usually classified by metallographic structure. According to the metallographic structure, it is classified into: ferritic (F) type stainless steel, martensitic (M) type stainless steel, austenitic (A) type stainless steel, austenitic-ferritic (AF) type duplex stainless steel, austenitic (A) type stainless steel, Tensite-martensitic (AM) type duplex stainless steel and precipitation hardening (PH) type stainless steel.