It is a ferritic-austenitic (duplex) stainless steel, which combines the most beneficial characteristics of many ferritic and austenitic steels. Because of the high content of chromium and molybdenum, the steel has excellent pitting corrosion resistance, crevice corrosion resistance and uniform corrosion resistance. The bidirectional microstructure ensures that the steel has high stress corrosion cracking resistance and high mechanical strength.

Stainless steel is used in oil and gas industry; Offshore oil platforms (heat exchange pipelines, water treatment and water supply systems, fire fighting systems, water spraying systems and water stabilization systems; Petrochemical equipment; Seawater desalination (seawater desalination) equipment (as well as high-pressure pipelines and seawater pipelines in the equipment); Mechanical and structural components with high strength and corrosion resistance are needed; Gas purification equipment. Main ingredients: 25cr-7ni-4mo-0.27n.

National standards:

ASTM/ASME:A240 - UNS S32750

European currency:1.4410-x2crnimon25-7-4

AFNOR:Z3 CN 25.06 Az

German industrial standard /EN 1.44 10, american society of mechanical engineers SA-240.

Chemical composition:

C≤0.03，

Si≤0.80，

Mn≤ 1.2，

Chromium: 24-26,

Ni: 6-8,

S≤0.02，

P≤0.035，

Mo: 3-5,

N:0.24-0.32

Application fields: pulp and paper industry, seawater desalination, flue gas purification, heat exchanger, chemical tanker pipeline system, seawater system, etc.