ASTM A790 UNS S31803 Duplex Stainless Steel Tube For Marine / Offshore
ASTM A790 UNS S31803 Stainless Steel Tube Duplex Stainless For Marine and Offshore
Specifications
ASTM A790 covers seamless and straight-seam welded ferritic/austenitic stainless steel pipe intended for general-purpose applications.
ASTM A790 UNS S31803 Pipes is a nitrogen enhanced duplex stainless steel that was developed to combat common corrosion problems and is the most widely used grade in the duplex family of stainless steels. Duplex Steel is a cost effective solution for many applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Duplex UNS S31803 Seamless Pipes and Tubes can be utilized in marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications.
| American Standard | Standard Name |
| A 790 / SA 790 | Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe |
ASTM A790 UNS S31803 Stainless Steel Tube Chemical Composition
(Sources American Standard A790 / A790M TABLE 2 Chemical Requirements)
| UNS Designation A | C | Mn | P | S | Si | Ni | Cr | Mo | N |
| S31803 | 0.03 | 2 | 0.03 | 0.02 | 1 | 4.5–6.5 | 21.0–23.0 | 2.5–3.5 | 0.08–0.20 |
ASTM A790 UNS S31803 Stainless Steel Tube Mechanical Properties
(Sources American Standard A790 / A790M TABLE 3 Tensile and Hardness Requirements)
| UNS Designation | Tensile strength, | Yield strength, | Elongation | Hardness, max | |
| min, | min | in 2 in. or 50 | |||
| ksi[MPa] | ksi[MPa] | mm, min,% | HBW | HRC | |
| S31803 | 90 [620] | 65 [450] | 25 | 290 | 30 |
ASTM A790 UNS S31803 Stainless Steel Tube Application
- Oil and Gas Industry
- Downhole Tubing and Casing
- Flowlines and Gathering Lines
- Process Piping
- Heat Exchanger and Condenser Tubes
- Chemical Process Industry
- Process Piping and Vessel Internals
- Heat Exchanger Tubes
- Pulp and Paper Industry
- Marine and Offshore Applications
- Seawater Cooling Systems
- Desalination Plants
- Shipbuilding
- Power Generation
- Feedwater Heater Tubes
- Flue Gas Desulfurization (FGD) Systems
- Auxiliary Cooling Systems
- Water and Wastewater Treatment
- Structural and Mechanical Components
ASTM A790 UNS S31803 Stainless Steel Tube Packing & Loading
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