ASTM A789 UNS S31803 SAF2205 Duplex Steel Seamless Tube
ASTM A789 UNS S31803 (SAF2205) duplex stainless steel pipe is a seamless or welded pipe with excellent mechanical properties and excellent corrosion resistance, which is widely used in harsh environments. Its composition is about 22% chromium, 5-6% nickel, 3% molybdenum and nitrogen, forming an austenite-ferrite duplex microstructure, giving it high strength (yield strength ≥ 450MPa), excellent resistance to stress corrosion cracking, pitting and crevice corrosion, especially in chloride ion environments.
ASTM A789 UNS S31803 (SAF2205) duplex stainless steel pipe is suitable for fields such as oil and gas, marine engineering, chemical processing and seawater desalination. With the risk of no weld defects in the seamless process, it is particularly suitable for high pressure and high cycle load scenarios. At the same time, compared with traditional austenitic stainless steel (such as 316L), it can reduce wall thickness and reduce material costs. It is an ideal choice for both corrosion resistance and high strength requirements.
Chemical Composition of ASTM A789 UNS S32205 Duplex Stainless Steel Seamless Tubes
| Grade | | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| 2205 (UNS S31803) | Min Max | - 0.030 | - 2.00 | - 1.00 | - 0.030 | - 0.020 | 21.0 - 23.0 | 2.5 - 3.5 | 4.5 - 6.5 | 0.08 - 0.20 |
| 2205 (UNS S32205) | Min Max | - 0.030 | - 2.00 | - 1.00 | - 0.030 | - 0.020 | 22.0 - 23.0 | 3.0 - 3.5 | 4.5 - 6.5 | 0.14 - 0.20 |
Mechanical Composition of ASTM A789 UNS S31803 Duplex Stainless Steel Seamless Tubes
| Grade | Tensile Strength
(MPa) min | Yield Strength
0.2% Proof
(MPa) min | Elongation
(% in 50mm) min | Hardness |
| Rockwell C (HR C) | Brinell (HB) |
| UNS S31803 / 2205 | 621 | 448 | 25 | 31 max | 293 max |
Physical Properties Of ASTM A789 UNS S31803 Duplex Stainless Steel Seamless Tubes
| Grade | Density
(kg/m3) | Elastic
Modulus(GPa) | Mean Co-eff of Thermal
Expansion (μm/m/°C) | Thermal
Conductivity (W/m.K) | Specific
Heat
0-100°C( J/kg.K) | Electrical
Resistivity
(nΩ.m) |
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C |
| UNS S31803 / 2205 | 782 | 190 | 13.7 | 14.2 | - | 19 | - | 418 | 850 |
Grade Specification Comparison
| Grade | UNS
No | Old British | Euronorm | Swedish SS | Japanese JIS |
| BS | En | No | Name |
| 2205 | S31803 / S32205 | 318S13 | - | 1.4462 | X2CrNiMoN22-5-3 | 2377 | SUS 329J3L |
Application Of ASTM A789 S32205 Duplex Steel SeamlessTube.
Oil & Gas: Subsea pipelines, heat exchangers, umbilicals.
Chemical Processing: Reactors, condensers, acid handling.
Desalination Plants: RO tubes, brine heaters.
Power Generation: Cooling systems, condenser tubes.
Marine: Shipbuilding components exposed to seawater.
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ASTM A789 UNS S31803 SAF2205 Duplex Steel Seamless Tube In Aggressive Environments Images
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