Duplex Stainless Steels
Duplex Stainless Steels are;
Duplex (Austenitic-Ferritic) or 22% Chrome St/St, also with
• Nickel (Ni) 5%
• Molybdenum (Mo) 3%
• Sometimes Copper (Cu) 1%
Fe Cr22 Ni5 Mo3
• UNS J92205
Also known as:
• UNS S31803, SAF2205, Alloy 2205, DIN 1.4462
• 4A (ASTM 891)
Typical Properties
• Tensile 620 min N/mm2
• Yield 415 min N/mm2
• Elongation 20%
• Hardness 185 HB typ
• Density 7.8 g/cm3
• P/T ratings, typically B16.34 group 2.8 =20 bar class 150 (UNS S32570)
Corrosion Properties
• Good for seawater service
• Especially good for:
o General corrosion
o Erosion /corrosion
o Stress corrosion cracking
o Corrosion fatigue
• Poor fouling resistance
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