| Standard: | ASTM A790 | Grade: | UNS S31803 |
|---|---|---|---|
| Material: | Duplex Stainless Steel | Outside Diameter: | 1/8′-48′ |
| Wall Thickness: | SCH5S To SCHXXS | Types: | Seamless |
| End: | BE/PE | Length: | 6m， 12m， Or As Required |
| High Light: | 12m Duplex Steel， sch5s Duplex Steel， Seawater Corrosion Resistant Stainless Steel Pipe | ||
ASTM A790 S31803 Duplex Steel
ASTM A790 S31803 is a specification for seamless duplex steel pipes. Duplex steel is a type of stainless steel that contains both austenitic and ferritic microstructures， providing excellent strength and corrosion resistance.
are manufactured without any welding seams， which makes them more reliable and suitable for high-pressure and high-temperature applications.
These pipes are commonly used in industries such as oil and gas， chemical processing， and marine engineering. They are known for their superior performance in harsh environments and are highly resistant to corrosion， pitting， and cracking.
Chemical Composition of ASTM A790 UNS S31803 Duplex Stainless Steels
| 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 A790 UNS S31803 Duplex Stainless Steels
| 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 A790 UNS S31803 Duplex Stainless Steels
| 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 A790 S31803 duplex steel.
1. Oil and gas industry
2. Chemical processing industry
3. Power generation industry
4. Water treatment industry
5. Marine industry
6. Food processing industry
