Stainless steel has been invented since the beginning of this century and it has been more than 90 years old. The invention of stainless steel is a major achievement in the world's metallurgical history. The development of stainless steel has laid an important foundation for the development of modern industry and scientific and technological progress.
There are many types of stainless steel and various properties. It has gradually formed several major categories in the development process. According to the organizational structure, it is divided into four categories: Martensitic stainless steel (including precipitation hardening stainless steel), ferritic stainless steel, austenitic stainless steel and austenite plus ferritic duplex stainless steel; according to the main chemical composition in steel 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.; they are classified as nitric acid-resistant stainless steel according to their performance characteristics and applications. , Sulfuric acid resistant stainless steel, corrosion resistant stainless steel, stress corrosion resistant stainless steel, high strength stainless steel, etc.; classified by the functional characteristics of steel, is divided into low temperature stainless steel, non-magnetic stainless steel, free cutting stainless steel, superplastic stainless steel and so on.
At present, the commonly used classification methods are classified according to the characteristics of the steel structure and the chemical composition of steel and the combination of the two.
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