Duplex steel S31200, also known as UNS S31200, is a grade of duplex stainless steel that has high strength and excellent resistance to corrosion. It isand it is widely used in various industrial applications such as chemical processing, offshore oil exploration, and gas processing.

The process of manufacturing duplex steel S31200 plates/sheets involves hot and cold rolling, annealing, pickling, and finishing. The ingots of the steel are first heated to a temperature of 1150°C-1200°C and then hot rolled into plates or sheets. The hot-rolled plates/sheets are then cooled to room temperature, and their surface is treated using an acid solution to remove any oxides. The plates/sheets are then annealed in a controlled atmosphere to improve their mechanical properties and reduce their hardness. Finally, they are cold-rolled to achieve the desired dimensions and surface finish.

Duplex steel S31200 Chemical Composition:

- Carbon (C): 0.03% max
- Chromium (Cr): 22.0-23.0%
- Nickel (Ni): 4.50-6.50%
- Molybdenum (Mo): 3.00-3.50%
- Nitrogen (N): 0.14-0.20%
- Phosphorus (P): 0.030% max
- Sulfur (S): 0.020% max
- Silicon (Si): 1.00% max
- Manganese (Mn): 2.00% max
- Iron (Fe): balance
 

Duplex steel S31200 plates physical properties

- Density: 7.8 g/cm³
- Melting point: 1398-1446°C
- Thermal conductivity: 14.2 W/mK at 100°C
- Coefficient of thermal expansion: 13.7 µm/m°C at 20°C
- Specific heat capacity: 460 J/kg°C at 20°C
- Electrical resistivity: 74 µΩ·cm at 20°C

Duplex steel S31200 plates Application:

- Chemical processing: Duplex steel S31200 plates/sheets have excellent corrosion resistance, making them suitable for use in chemical processing plants. They are used to build tanks, pipework, and other equipment that comes in contact with harsh chemicals.
- Offshore oil exploration: Duplex steel S31200 plates/sheets are used in offshore platforms, drilling equipment, and pipelines due to their high strength and corrosion resistance.
- Gas processing: Duplex steel S31200 plates/sheets are used to build compressors, valves, and other equipment that is exposed to high-pressure and corrosive gases.
- Structural applications: Duplex steel S31200 plates/sheets are used in the construction industry to build bridges, tunnels, and other structures due to their high strength and durability.

Duplex steel S31200 plates/sheets are a high-quality duplex stainless steel with a unique combination of austenitic and ferritic phases. They have excellent strength and corrosion resistance, making them ideal for use in various industrial applications. The manufacturing process of duplex steel S31200 plates/sheets involves hot and cold rolling, annealing, pickling, and finishing, resulting in a high-quality product that meets various standards. The chemical composition and physical properties of duplex steel S31200 plates/sheets are carefully balanced to provide optimal performance in different applications. Overall, duplex steel S31200 plates/sheets are an excellent choice for any application that requires high strength and corrosion resistance.