UNS S31803 Duplex Stainless Steel

UNS S31803 is the representative grade of duplex stainless steel containing 22% chromium and 5% nickel, often referred to as Alloy 2205. This material has very good general corrosion resistance and high strength is the most widely used duplex grade.

The grade 2205 offers excellent resistance to intergranular corrosion, pitting and crevice corrosion combined with its resistance to chloride stress corrosion cracking at temperatures 50- 300ºC. The Alloy 2205 stainless steel is extremely versatile with many applications in the oil and gas, petrochemical, and chemical processing industries.

JIS designation: SUS 329J3L

EN/DIN Numerical equivalent:1.4507

EN/DIN Symbolical equivalent:X2CrNiMoCuN25-6-3

American designation equivalent: SAE J405

Available Forms and Specifications

S31803 sheet/plate/coil: JIS G4304 / 4305, ASTM A240

S31803 seamless pipe/tube: ASTM A789,ASTM A790

S31803 welded pipe/tube: ASTM A928

S31803 round bar:ASTM A479, ASTM A276

S31803 Duplex Flanges: ASTM A182 F51

Chemical composition

Cr Ni Mo N Mn Si  S P C
21.0-23.0 4.5-6.5 2.5-3.5 0.08-0.2 2.00 max 1.00 max 0.02 0.03 0.03 max

Mechanical Properties

Density,g/c㎡ 7.8
Melting range,℃ 1350-1390
Tensile strength, min, Mpa 620
Yield strength, 0.2% offset, min, Mpa 450
Elongation, A5% 25
Hardness, Brinell 290 MAX


Duplex stainless steels S31803 are typically used in:

Chemical processing| Chloroethylene production equipment, methanol synthesis reactor, acetic acid transport, and storage

Oil and gas| Oil and gas exploration and transportation, Catalytic cracking equipment, hydrotreating equipment

Marine environments, Pollution control equipment, Pulp & paper manufacturing, Food processing plant, and so on.

Alloy S31803 is widely used in oil and gas industrial, marine industrial, chemical processing, and nuclear industries due to its excellent strength and good corrosion resistance. Lkalloy is one of the leading vendors of S31803 stainless steel pipe, tube, plate, and pipe fittings in the solution treated and quenched condition.

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