What is ASTM A790 S31803 material pipe?
What material is ASTM A790?
ASTM is the American Society for Testing and Materials, and A790 is the 'Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe'. This general specification for supply defines the composition and mechanical property requirements for seamless and straight seam-welded steel pipe.
What is ASTM A790 S31803 material pipe?
ASTM A790 S31803 pipe is a duplex stainless steel with high corrosion resistance and mechanical strength. Its PREN (Pitting Resistance Equivalent Number) is ≥40, providing excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking in harsh environments such as offshore oil platforms, chemical processing, and seawater systems. Conforming to ASTM A790, typical sizes range from 6.0 to 1219.2 mm (1/4 to 48 inches) in outside diameter and 0.5 to 50 mm (0.02 to 2 inches) in wall thickness.
What is the composition of uns S31803 material?
UNS S31803/2205 is a duplex grade with a ferritic-austenitic microstructure. The alloy consists of around 40-50% ferrite in the annealed condition. The duplex microstructure has the high strength of the ferritic grades whilst retaining the corrosion resistance of the austenitic grades.
Equivalent Material Grade Of Duplex UNS S31803 Pipe
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Duplex S31803 | S31803 | 1.4462 |
What is the composition of uns S31803 material?
UNS S31803/2205 is a duplex grade with a ferritic-austenitic microstructure. The alloy consists of around 40-50% ferrite in the annealed condition. The duplex microstructure has the high strength of the ferritic grades whilst retaining the corrosion resistance of the austenitic grades.
ASTM A790 Grade S31803 Pipes Chemical Composition Chart
| C | N | P | Si | Mn | Mo | Fe | Cr | S | Ni |
|---|---|---|---|---|---|---|---|---|---|
| 1.0 | 0.03 | 0.02 | 2.0 | 3.0 - 3.5 | 22.0 - 23.0 | 0.03 | 4.5 - 6.5 | 0.14 - 0.2 | Bal |
ASTM A790 UNS S31803 Seamless Pipes mechanical properties
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
|---|---|---|---|---|
| 7.8 g/cm3 | 1350 °C (2460 °F) | Psi - 80000 , MPa - 550 | Psi - 116000 , MPa - 800 | 15 % |
Physical Properties of ASTM A790 Grade UNS S31803 Welded Pipe
| Grade S31803 | 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 | 782 | 190 | 13.7 | 14.2 | – | 19 | – | 418 | 850 |
A790 UNS S31803 pipe Price per kg
The A790 UNS S31803 duplex stainless steel pipe price per kg typically ranges from USD 5.5 to 7.5, depending on size, surface finish, and order quantity.
Difference Between Uns S31803 And Uns S32205
UNS S31803 and UNS S32205 are referred to as duplex 2205. Generally, UNS2205 contains ASTM S31803 and S32205 duplex stainless steels. In other words, S31803 and S32205 are both called 2205 stainless steel, and S32205 is the updated series of S31803 by the including of the lower limit content of Chromium, Molybdenum and Nitrogen components, which makes the small difference in mechanical properties.
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Types of ASTM A790 UNS S31803 pipe
| Duplex 2205 S31803 Rectangular Pipes | Duplex 2205 S31803 EFW Pipes |
| SCH20 Duplex 2205 S31803 Pipes | SCH80 S31803 Duplex Steel Pipes |
| Hot Rolled Duplex 2205 S31803 Pipes | Hot Rolled Duplex Steel S31803 Seamless Pipes |
| Hot Rolled Stainless Duplex S31803 Welded Pipes | Cold Drawn S31803 Duplex Pipes |
| Cold Drawn Duplex 2205 S31803 Welded Pipes | Cold Drawn Duplex Steel S31803 Seamless Pipes |
| Duplex Steel S31803 Square Pipes | Stainless Duplex S31803 Hollow Pipes |
| Duplex Steel S31803 Fabricated Pipes | S31803 Duplex 2205 Annealed pipes |
| Stainless Duplex S31803 small diameter Pipes | Duplex Steel S31803 Capillary Pipes |
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