To type Stainless steel is often divided into tissue state: martensite Steel, ferrite Steel, austenitic steel, austenitic-ferrite (duplex) stainless steel and precipitated hardened stainless steel. In addition, can be divided into components: Chromium stainless steel, chrome nickel stainless steel and chromium manganese nitrogen stainless steel.
There is also a special stainless steel for pressure vessels "GB24511_2009_ pressure equipment with stainless steel steel plate and steel belt."
Ferrite Stainless Steel Contains chromium 15%~30%. Its corrosion resistance, toughness and solderability with the increase of chromium content, resistance to chloride stress corrosion performance is better than other types of stainless steel, belong to this category of Crl7, Cr17Mo2Ti, Cr25,cr25mo3ti, Cr28 and so on. Ferrite Stainless steel Because of the high chromium content, corrosion resistance and antioxidant properties are relatively good, but the mechanical properties and process performance is poor, mostly used for less powerful acid-resistant structure and for the use of antioxidant steel.
This kind of steel can resist the corrosion of atmosphere, nitric acid and saline solution, and has the characteristics of good high temperature antioxidant performance and small coefficient of thermal expansion, used in nitric acid and food plant equipment, but also can make parts working at high temperature, such as gas turbine parts.
Austenitic stainless Steel
Title Contains more than 18% chromium, but also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good comprehensive performance, can withstand a variety of media corrosion. Austenitic stainless Steel's commonly used grades are 1Cr18Ni9, 0Cr19Ni9 and so on. The Wc<0.08% of 0Cr19Ni9 steel is marked as "0" in the steel number. This type of steel contains a large amount of Ni and Cr, making the steel in austenitic condition at room temperature. This type of steel has good plasticity, toughness, weldability, corrosion resistance and non-magnetic or weak magnetism, in oxidizing and reductive media corrosion resistance is good, used to make acid resistant equipment, such as corrosion resistance containers and equipment lining, conveyor pipes, nitric acid equipment parts, etc., but also can be used as the main material of stainless steel watch jewelry.
Austenitic stainless steel generally uses solid solution treatment, the steel will be heated to 1050~1150℃, and then water-cooled or air-cooled, in order to obtain Tansiango body tissue.
Austenitic-ferrite Duplex stainless Steel It also has the advantages of austenitic and ferrite stainless steel, and has superplastic.
Austenite and ferrite tissue
Title Each of them accounts for about half of the stainless steel. In the case of a lower containing C, the Cr content in the 18%~28%,Ni content at 3%~10%. Some steels also contain Mo, Cu, Si, Nb, Ti,n and other alloy elements. This type of steel has the characteristics of austenitic and ferrite stainless steel, compared with ferrite, plastic, toughness is higher, no room temperature brittleness, intergranular corrosion resistance and welding performance are significantly improved, but also maintain ferrite stainless steel 475 ℃ brittleness and high thermal conductivity, with superplastic and other characteristics. Compared with austenitic stainless steel, the strength is high, the resistance between intergranular corrosion and the stress corrosion resistance of chloride are obviously improved.
Duplex stainless steel has excellent porosity and corrosion resistance, and is also a nickel-saving stainless steel.
Precipitated hardened Stainless steel The matrix is austenitic or martensite tissue, and the commonly used grades of precipitated hardened stainless steel are 04Cr13Ni8Mo2Al.
It can be treated by precipitation hardening (also known as aging hardening) to make it hard (strong) stainless steel.
Stainless Steel Disinfection Cabinets
Martensite Stainless Steel The strength is high, but the plasticity and solderability are poor. Martensite stainless steel commonly used grades have 1Cr13, 3Cr13 and so on, because of the high carbon content, so has a high strength, hardness and wear resistance, but the corrosion resistance is slightly worse, for the mechanical properties of high requirements, corrosion resistance requirements of some parts, such as springs, steam turbine blades, hydraulic press valves and so on. This type of steel is used after quenching and tempering treatment.
Annealing is required after forging and stamping.
Stainless steel steel plate and steel strip for pressurized equipment Pressure vessel Special stainless steel, its classification and code, size, shape and allowable deviation, technical requirements, test methods, inspection rules, packaging, signs and product quality certificates have clear requirements. Commonly used grades have 06Cr19Ni10, 022Cr17Ni12Mo2 Digital code is: S30408, S31603 and so on. Mainly used in food machinery, pharmaceutical machinery and other health-grade equipment.