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2205 DSS

S31803, S32205, 1.4462, X2CrNiMoN22-5-3, 022Cr22Ni5Mo3N, 022Cr23Ni5Mo3N

2205duplex stainless steel(2205 DSS)is a two-phase, ferritic-austenitic 22% chromium, 5 to 6% nickel, 3% molybdenum alloyed stainless steel. Itcontains about 40~50% ferrite in the annealed condition. 2205 has been a practical solution to chloride stress corrosion cracking problems experienced with 304/304L or 316/316L stainless. The high chromium, molybdenum and nitrogen contents provide corrosion resistance superior to 316/316L and 317L stainless in most environments. The design strength of 2205 is significantly higher than 316/316L, often permitting lighter wall construction.

Duplexstainlesssteel is characterized bygood fatigue strength, as well as outstandingintercrystalline corrosion resistance, stress corrosion resistance, pitting corrosion resistance, low coefficient of thermal expansion and work temperature up to 200-250 ℃. Compared to ordinary austenitic acid resistant steels, it exhibits much better strength properties and higher wear resistance and erosion resistance.

DSS resists chloride environments and sulphide stress corrosion and is roughly double the strength of standard austenitic stainless steels. It can be used successfully as an alternative to 300 series austenitic stainless steel in most applications where higher mechanical strength/lower weight is required.

Typical applications include pipework with various applications in the oil-gas, chemical, shipbuilding, aviation, cryogenic, paper, mining, petrochemical, power, Pharmaceutical and Biotechnology industries.

Compared to conventional austenitic stainless steels such as Type 304 and 316, 2205 DSS possesses superior resistance in most oxidizing and reducing acids; superior chloride pitting and crevice corrosion resistance due to higher chromium, molybdenum and nitrogen content; and superior resistance to chloride stress corrosion cracking.

Tensile Strength: 90 KSI min (620 MPa min)

Yield Strength(0.2% Offset): 65 KSI min(450 MPa min)

Elongation: 25% min.

Reduction of area: 45% min.

Temperature:1870~2010°F(1020~1100°C)

Rapid cooling in air or water

Hardness: HRC30, HBW290, HV290 max.

Hardening

It cannot be hardened by heat treatment. Can be hardened only by cold working.

(1)Hot formed, solution annealed, descaled

(2)Cold worked and bright annealed

(3)Cold worked, annealed and descaled

(4)Cold worked, polished (MP, EP etc.)

(5)Cold worked, bright annealed, polished (MP, EP etc.)

Chemical composition

Tension

Hardness

Flaring

Flange

Flattening

Micro structure

Hydrostatic

NDT

Intergranular Corrosion

Surface condition

Shape and dimension

Positive Material Identification