Main types of stainless steel flange materials:
Stainless steel for stainless steel flanges is often divided into martensitic steel, ferritic steel, austenitic steel, AUSTENITIC FERRITIC (duplex) stainless steel and precipitation hardening stainless steel according to the organizational state. In addition, the material of stainless steel flange can be divided into: chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel. There is also gb24511_2009_stainless steel plates and strips for pressure equipment, which are made of special stainless steel flanges for pressure vessels.
Ferritic stainless steel made of stainless steel flange, containing 15% - 30% chromium. Its corrosion resistance, toughness and weldability are improved with the increase of chromium content, and its chloride stress corrosion resistance is better than other kinds of stainless steel, including Crl7, cr17mo2ti, Cr25, cr25mo3ti, Cr28, etc. Ferritic stainless steel has good corrosion resistance and oxidation resistance due to its high chromium content, but the mechanical and technological properties of stainless steel flange material are poor. It is mostly used in acid resistant structures with little stress and as oxidation resistant steel. This kind of steel can resist the corrosion of atmosphere, nitric acid and brine solution, and has the characteristics of good high-temperature oxidation resistance and low coefficient of thermal expansion. It is used in nitric acid and food factory equipment, and it can also be used to make stainless steel flanges working at high temperature, such as gas turbine parts. Austenitic stainless steel made of stainless steel flange contains more than 18% chromium, about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Stainless steel flange material has good comprehensive performance and can resist corrosion of various media. Common grades of austenitic stainless steel include 1Cr18Ni9, 0Cr19Ni9, etc.
