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Seamless Industrial Duplex Stainless Steel Pipe UNS S32205 / S31803
WUXI XINFUTIAN METAL PRODUCTS CO., LTD now includes Duplex 2205 (UNS S32205 / S31803), in sheet, sheet coil, plate, plate coil, round bar, pipe processed flat bar and tubular products. Duplex 2205 is ideally suited for high-pressure and highly corrosive environments.
Standards
ASTM/ASME ................A240 UNS S32205/S31803
EURONORM ................1.4462 X2CrNiMoN 22.5.3
AFNOR..........................Z3 CrNi 22.05 AZ
DIN ..............................W.Nr 1.4462
1.Products Details
Duplex 2205 is a two-phase, ferritic, austenitic 22% chromium, 3% molybdenum, 5 to 6% nickel alloyed stainless steel. It is the most widely used duplex stainless steel grade and is characterized by high yield strength, double that of the standard austenitic stainless steel grades. It also demonstrates good fatigue strength, as well as outstanding resistance to stress corrosion cracking, crevice, pitting, erosion, and general corrosion in severe environments.
Chemical Properties
| C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 2205 (S31803) | 0.03 max | 2.0 max | 1.0 max | 0.03 max | 0.02 max | min: 21.0 max: 23.0 | min: 2.5 max: 3.5 | min: 4.5 max: 6.5 | min: 0.08 max: 0.20 |
| 2205 (S32205) | 0.03 max | 2.0 max | 1.0 max | 0.03 max | 0.02 max | min: 22.0 max: 23.0 | min: 3.0 max: 3.5 | min: 4.5 max: 6.5 | min: 0.14 max: 0.20 |
Mechanical Properties
| Grade | Tensile Strength ksi (min) | Yield Strength 0.2% ksi (min) | Elongation % | Hardness (HB) MAX |
| 2205 | 90 | 65 | 25 | 217 |
2. Alloy 2205 ASTM Grade
| Grade | 2205 Seamless and welded tube and pipe | 2205 Plate, sheet and strip | 2205 Bar | 2205 Forgings | 2205 Flanges | 2205 Fittings |
| Duplex 2205 / Avesta 2205 / Saf 2205 Duplex Stainless Steel | ASTM A789; A790 NFA 49-217 | ASTM A240 EN 10088-2 | ASTM A276 ASTM A479 EN 10088-3 | ASTM A182 | ASTM A182 | ASTM A182, ASTM A815 |
3. Process
Welding Characteristics
A. Possesses good weldability
B. Should not generally be welded without filler metal as this may result in excessive ferrite
Heat-Treatment
A. Annealing temperature range is 1868 to 2012°F (1020 to 1100°C)
B. Cannot be hardened by heat treatment – but Duplex 2205 does work-harden
C.Special consideration is needed to compensate for a higher coefficient of thermal expansion to avoid warping and distortion
Process -hot forming
Most Duplex 2205 producers recommend a maximum hot forming temperature between 2010 and 2100°F (1100 to 1150°C). If the shape of the work piece is not compact, the edges may be significantly cooler than the bulk, and there is risk of cracking in the cooler regions.
Process -Cold Forming
Duplex 2205 has shown good formability in a variety of fabrications. The high strength of Duplex 2205 can pose problems. Even when the equipment has sufficient power, allowance must be made for higher spring-back caused by the grade’s high strength.
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4.Application