2057 is more corrosion resistant.
S32750 duplex steel is a ferritic-austenitic (duplex) stainless steel. It combines many beneficial properties of ferritic steel and austenitic steel. Due to the chromium and molybdenum content of the steel The content of steel is very high, so it has good resistance to pitting corrosion, crevice corrosion and uniform corrosion. The dual-phase microstructure ensures that the steel has high resistance to stress corrosion cracking and has high mechanical strength.
1. Corresponding grades of F53 stainless steel: 1. National standard GB-T standard: digital grade: S25073, new grade: 022Cr25Ni7Mo4N, old grade: 1, 2. American standard: ASTMA standard: S32750, SAE standard: 2507, UNS standard: F53, 3. Japanese standard JIS standard: -, 4. German standard DIN standard: 1.4410, 5. European standard EN standard: G-X10CrNiMo18-9, x2crnimon25-7-4.
2. Chemical composition of F53 stainless steel: ⑴ Carbon C: ≤0.030, ⑵ Silicon Si: ≤ 0.80, ⑶ Manganese Mn: ≤ 1.20, ⑷ Phosphorus P: ≤ 0.035, ⑸ Sulfur S: ≤ 0.020, ⑹ Chromium Cr: 24.00~26.00, ⑺Nickel Ni: 6.00~8.00, ⑻Molybdenum Mo: 3.00~5.00, ⑼Nitrogen N: 0.24~0.32, ⑽Copper Cu: ≤0.5, ⑾Other elements: -.
3. Physical properties of F53 stainless steel: ① Density (20℃)/kg/dm3: 7.8, ② Melting point/℃: —, ③ Specific heat capacity (0~100℃)/kg/(kg.k ):0.46,④Thermal conductivity/w/(m.k)100℃-:14,⑸Thermal conductivity/w/(m.k)500℃-:-,⑥Linear expansion coefficient/(10-6/k)0~ 100℃:12,⑦Linear expansion coefficient/(10-6/k)0~567℃:-,⑧Resistivity (20℃)/(Ω.mm2/m):-,⑨Longitudinal elastic modulus (20℃ )/GPa:185, ⑩Magnetic: Yes.
IV. Mechanical properties of F53 stainless steel: ⑴ Delivery status: solution treatment of rods, solution pickling of plates, ⑵ tensile strength (RM/MPa): 795, ⑶ elongation strength (Rp0.2 /MPa): 550, ⑷ Elongation A/%: 15, ⑸ Reduction of area (Z/%): -. 5. Heat treatment of F53 stainless steel: ① Hardness HBW≤: solid solution 227, hardness HRB≤: 29, ② Heating temperature: 950~1100, ③ Heating method: quick cooling.
F53 stainless steel application areas: used in the oil and natural gas industry; offshore Shipotian oil platforms (heat exchanger tubes, water treatment and water supply systems, fire protection systems, water spray systems, water stabilization systems; petrochemical equipment ; Desalination (desalination) equipment (and high-pressure pipes and seawater pipes in the equipment); mechanical and structural components that require both high strength and high corrosion resistance; combustion (waste) gas purification equipment is the most resistant part in duplex stainless steel. It is a very corrosive steel, characterized by its good resistance to pitting corrosion, high strength, resistance to chloride stress corrosion, and weldability. It is very suitable for use in the chemical, petroleum, petrochemical and power industries using river water, groundwater and seawater. Heat exchange equipment for cooling medium.