Our products conform to GB, AISI, ASTM, DIN, EN, JIS standard for stainlesss steel coil, sheet and plate.
┃ Material
S31803, S32205, 1.4462, X2CrNiMoN22-5-3, 022Cr22Ni5Mo3N, 022Cr23Ni5Mo3N
┃ Overview
2205 duplex stainless steel (2205 DSS) is a two-phase, ferritic-austenitic 22% chromium, 5 to 6% nickel, 3% molybdenum alloyed stainless steel. It contains 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.
┃ Characteristics
Duplex stainless steel is characterized by good fatigue strength, as well as outstanding intercrystalline 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.
┃ Application
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.
┃ Chemical composition (wt% as per ASTM A789 / A790)
|
Material |
C |
Si |
Mn |
P |
S |
|
S31803 |
≤0.03 |
≤1.0 |
≤2.0 |
≤0.030 |
≤0.020 |
|
S32205 |
≤0.03 |
≤1.0 |
≤2.0 |
≤0.030 |
≤0.020 |
|
Material |
Cr |
Ni |
Mo |
N |
|
|
S31803 |
21.0~23.0 |
4.50~6.50 |
2.50~3.50 |
0.08~0.20 |
|
|
S32205 |
22.0~23.0 |
4.50~6.50 |
3.00~3.50 |
0.14~0.20 |
|
┃ Corrosion resistance
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.
┃ Mechanical property
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.
┃ Heat treatment
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.
┃ Available process
(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.)
┃ Common tests
Chemical composition
Tension
Hardness
Flaring
Flange
Flattening
Micro structure
Hydrostatic
NDT
Intergranular Corrosion
Surface condition
Shape and dimension
Positive Material Identification
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