UNS S32205 Duplex Stainless Steel

UNS S32205 is a duplex grade with a ferritic-austenitic microstructure. The alloy consists of around 40-50% ferrite in the annealed condition. The duplex microstructure has the high strength of the ferritic grades whilst retaining the corrosion resistance of the austenitic grades. It is not uncommon to see the metal used as a practical solution to chloride-induced stress cracking, which is the Achilles’ heel of stainless steel. UNS S32205 has superior resistance to chloride pitting and crevice corrosion as compared to 317L stainless steel. The alloy has outstanding corrosion resistance to seawater and most concentrations of sulphuric acid. In addition, UNS S32205 duplex stainless is also resistant to sulfide stress corrosion cracking (sour-gas environments). The high quality and therefore performance of UNS S32205 is widely attributed to the high levels of chromium present as well as nitrogen and molybdenum.

JIS designation: SUS 329J3L

EN/DIN Numerical Equivalent:1.4507

EN/DIN Symbolical Equivalent:X2CrNiMoCuN25-6-3

SAE J405

Available Forms and Specifications

S32205 sheet/plate/coil: JIS G4304 / 4305, ASTM A240

S32205seamless pipe/tube: ASTM A789, ASTM A790

S32205 welded pipe/tube: ASTM A928, ASTM A789

S32205round bar:ASTM A479, ASTM A276

S32205 Duplex Flanges: ASTM A182 F60

Chemical composition

Cr Ni Mo N Mn Si  S P C
22.0-23.0 4.5-6.5 3.0-3.5 0.14-0.2 2.00 max 1.00


0.02 0.03 0.03


Mechanical Properties

Density,g/c㎡ 7.8
Melting range,℃ 1350-1390
Tensile strength, min, Mpa 655
Yield strength, 0.2% offset, min, Mpa 450
Elongation, A5% 25
Hardness, Brinell 290 MAX


Duplex stainless steels S32205 are typically used in:

Chloroethylene production equipment, methanol synthesis reactor, acetic acid transport, and storage, Oil and gas exploration and transportation, Catalytic cracking equipment, hydrotreating equipment, Marine environments, Pollution control equipment, Pulp & paper manufacturing, Food processing plant, and more.

Alloy S32205 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 S32205 stainless steel pipe, tube, plate, and pipe fittings in the solution treated and quenched condition. Available specifications of S32550 is ASTM A240, ASTM A479, 1.4507 and so on.