Stainless steel - a general term for stainless steel and acid-resistant steel. Stainless steel refers to steel that is corroded by weak medium such as refractory gas, steam, and water, while acid-resistant steel refers to steel that is resistant to corrosion by chemically etched media such as acid, alkali, and salt. Stainless steel has been around since the beginning of this century and has a history of more than 90 years. The invention of stainless steel is a major achievement in the history of metallurgy in the world. The development of stainless steel has laid an important material and technical foundation for the development of modern industry and scientific and technological progress. There are many types of stainless steel and different properties. It has gradually formed several major categories in the development process. According to the structure of the organization, it is divided into four categories: Markov stainless steel (including precipitation hardening stainless steel), ferritic stainless steel, austenitic stainless steel and austenitic and ferrite double duplex stainless steel; according to the main chemical composition in steel or Some characteristic elements in steel are classified into chromium stainless steel, chrome-nickel stainless steel, chrome-nickel-platinum stainless steel, low-carbon stainless steel, high-molybdenum stainless steel, high-purity stainless steel, etc.: according to the performance characteristics and use classification of steel, it is divided into nitric acid-resistant stainless steel. , sulfuric acid resistant stainless steel, pitting resistant stainless steel, stress corrosion resistant stainless steel, high strength stainless steel, etc.; classified according to the functional characteristics of steel, divided into low temperature stainless steel, non-magnetic stainless steel, free cutting stainless steel, super plastic: stainless steel. At present, the commonly used classification methods are classified according to the structural characteristics of steel and the chemical composition of steel and 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, or divided into two categories: chromium stainless steel and nickel stainless steel. Stainless steel - used in anti-corrosive environments, as well as medical equipment and household items

  According to the provisions of GB/IT 221 "Steel Product Brand Representation Method", the Chinese Pinyin Village, the chemical element symbol and the combination of Arabic numerals are used.

  Carbon content: - Generally, the average carbon content (in thousands of parts) is represented by the Arabic digit in the head of the grade: the average carbon content is less than a thousandth - expressed by "O"; the carbon content is not 0. 03% is represented by "00".

  The alloying element content: when the average alloy content is less than 1.50%, only the element is indicated in the grade, and the content is generally not indicated: the average alloying element content is 1.50%-2.49%,

  2.50%-3. 9..22.50% -23. 4.., correspondingly marked 2,..2...