Stainless steel is often divided into martensitic steel, ferritic steel, austenitic steel, austenitic-ferrite (dual phase) stainless steel, precipitation hardening stainless steel, etc. according to microstructure. In addition, it can be divided into: chromium stainless steel, chromium nickel stainless steel, chromium manganese nitrogen stainless steel and so on. There is also a special stainless steel "GB24511_2009_Stainless steel plate and steel belt for pressure equipment" for pressure vessels.
Ferritic stainless steel
Contains 15% to 30% of chromium. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, chloride stress corrosion resistance is better than other types of stainless steel, this category includes Crl7, Cr17Mo2Ti, Cr25, Cr25Mo3Ti, Cr28 and so on. Ferritic stainless steel has high chromium content, good corrosion resistance and oxidation resistance, but poor mechanical properties and process performance. It is mostly used in acid-resistant structures with little stress and as anti-oxidation steel. This type of steel can resist the corrosion of the atmosphere, nitric acid and saline solution, and has the characteristics of high temperature oxidation resistance and small thermal expansion coefficient. It is used in nitric acid and food factory equipment, and can also be used to manufacture parts that work at high temperatures, such as gas turbine parts.
Austenitic stainless steel
It contains more than 18% chromium and about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. It has good comprehensive performance and can resist corrosion of various media. Common grades of austenitic stainless steel are 1Cr18Ni9, 0Cr19Ni9 and so on. The Wc of 0Cr19Ni9 steel is less than 0.08%, and the steel number is marked as "0". This type of steel contains a large amount of Ni and Cr, making the steel austenite at room temperature.
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