Stainless steel (Stainless Steel) is the abbreviation of rust resistant and acid resistant steel. It is called stainless steel with weak corrosion medium, such as air, steam and water, or stainless steel with rust, and the steel resistant to chemical corrosion medium (acid, alkali, salt and other chemical etching) is called acid resistant steel.
Because of the difference in chemical composition between them, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical medium corrosion, while acid resistant steel generally has rust. The word "stainless steel" is not just about a single kind of stainless steel, but more than one hundred kinds of industrial stainless steel. Each kind of stainless steel developed has good performance in its specific application field. The key to success is first to clarify the purpose and then to determine the right type of steel. There are usually only six kinds of steel related to the application of building structures. They all contain chromium of 17~22%, and the better kind of steel also contains nickel. Adding molybdenum can further improve atmospheric corrosiveness, especially chloride containing atmospheric corrosion. Stainless steel is often divided into martensitic steel, ferritic steel, austenitic steel, austenite ferrite (duplex) stainless steel and precipitation hardening stainless steel according to the state of organization. In addition, it can be divided into chromium stainless steel, chrome nickel stainless steel, chromium manganese nitrogen stainless steel and so on. There is also a special stainless steel "stainless steel plate and steel strip for GB24511_2009_ pressure equipment" for pressure vessels. Precipitated hardened stainless steel
The matrix is austenite or martensite. The commonly used grades of precipitation hardening stainless steel are 04Cr13Ni8Mo2Al and so on. It can be treated by precipitation hardening (also known as age hardening) to make hard (strong) stainless steel.
Stainless steel disinfector
Stainless steel disinfector
Martensitic stainless steel
The strength is high, but the plasticity and weldability are poor. The common brand of martensitic stainless steel is 1Cr13, 3Cr13 and so on. Because of its high carbon content, it has high strength, hardness and wear resistance, but the corrosion resistance is poor. Some parts, such as spring, turbine blade, hydraulic press valve, are used for high mechanical properties and corrosion resistance. This kind of steel is used after quenching and tempering. After forging and stamping, it needs to be annealed.
Stainless steel plate and steel strip for pressure equipment
Special stainless steel for pressure vessels, its classification, size, size, shape and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking and product quality certificate are clearly required. Commonly used brands are 06Cr19Ni10 and 022Cr17Ni12Mo2 Codes: S30408, S31603 and so on. It is mainly used in sanitary equipment such as food machinery, pharmaceutical machinery, etc. Shandong East fly metal materials Co., Ltd. mainly produces seamless pipe brand: 201304301304L, 321309S, 310S, 316316L and so on.
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