ASTM A790 S31803 F51 Duplex Pipes For Petrochemical Equipment
ASTM A790 S31803 F51 are duplex stainless steel pipes that meet the standard specifications of ASTM A790, which defines the composition and mechanical properties for both seamless and welded duplex stainless steel pipes. S31803 is the UNS (Unified Numbering System) designation for this grade, also known as 22Cr duplex stainless steel, and F51 is a designation from ASTM A182 for fittings and forgings, but is used interchangeably in the pipe industry for this material. These pipes offer a combination of high strength, excellent corrosion resistance, and good toughness, making them suitable for demanding applications in industries like oil and gas, chemicals, and marine environments.
Chemical Composition of ASTM A790 UNS S31803 Tubing
| Element | Composition, % |
| Carbon | 0.03 max |
| Manganese | 2.00 max |
| Phosphorus | 0.03 max |
| Sulfur | 0.02 max |
| Silicon | 1.00 max |
| Nickel | 4.50 – 6.50 |
| Chromium | 21.00 – 21.30 |
| Molybdenum | 2.50 – 3.50 |
| Nitrogen | 0.08 – 0.20 |
Duplex 31803 Seamless Pipes Mechanical Behaviour
| Property | Value | |
| Tensile Strength, min, ksi, [MPa] | 90 [ 620] | |
| Yield Strength, min, ksi [MPa] | 65 [450] | |
| Elongation in 2 in. or 50mm, min, % | 25 | |
| Hardness, max | HBW | HRC |
| 290 | 30 | |
Heat Treatment
| UNS | Heat Treating Temperature | Quench |
| S31803/F51 | 1870-2010°F [1020-1100°C] | Rapid cooling in air or water |
Hardness Requirements
| HBW | HRC |
| 290 max | 30max |
Applications Industries
Petrochemical Equipment
Condensers & Boiler & Heat Exchangers
Seawater and Wastewater Treatment Equipment,
Food Processing- Salt Making,etc.
Energy Field- Nuclear Power Generation,Tidal Power Generation,etc
Environmental Protection Field- Gas Processing,Waste Water Treatment,etc.
If you have a project need for ASTM A790 S31803 stainless steel bright annealed tubing, please feel free to place an order. GNEE has a large inventory of popular products for you to choose from. We can process these tubing into a variety of practical forms, including seamless and welded. For detailed chemical composition and free samples, please contact our factory today. We offer competitive pricing and excellent service.
Packaged in waterproof paper and steel strapping, these tubing meets standard export seaworthy packaging requirements and can be customized to suit various shipping methods.
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