astm a790 uns s31803 pdf
Jan 12, 2026
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ASTM A790 UNS S31803 duplex stainless steel pipes are supplied as seamless or welded pipes for corrosive and high-pressure applications. Combining high mechanical strength with excellent resistance to chloride corrosion, UNS S31803 (EN 1.4462 / Duplex 2205) is one of the most widely specified duplex stainless steel grades in global industrial projects.
For buyers searching "ASTM A790 UNS S31803 ", this page integrates product specifications, application guidance, and technical knowledge into a single, procurement-friendly reference.
What Is ASTM A790 UNS S31803?
ASTM A790 is the standard specification for seamless and welded ferritic/austenitic (duplex) stainless steel pipes intended for general corrosive service.
UNS Designation: S31803
Common Equivalent: EN 1.4462 / Duplex 2205
Microstructure: Approximately 50% ferrite + 50% austenite
UNS S31803 was developed to bridge the performance gap between austenitic grades (304/316) and super duplex stainless steels, offering higher strength and improved chloride resistance without excessive alloy cost.
Equivalent Material Grade Of Duplex UNS S31803 Pipe
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| Duplex S31803 | S31803 | 1.4462 |
Chemical Composition % (max values, unless noted) ASTM A790 S31803 Pipe
| UNS Designation[B] |
C | Mn | P | S | Si | Ni | Cr | Mo | N |
| S31803 | 0.030 | 2.00 | 0.030 | 0.020 | 1.00 | 4.5-6.5 | 21.0-23.0 | 2.5-3.5 | 0.08-0.20 |
Mechanical Properties ASTM A790 S31803 Pipe
| UNS Designation |
Tensile Strength, min,ksi [MPa] |
Yield Strength, min, ksi [MPa] |
Elongation in 2 in.or 50 mm min,% |
Hardness, max | |
| HBW | HRC | ||||
| S31803 | 90 [620] | 65 [450] | 25 | 290 | 30 |
ASTM A790 UNS S31803 vs Other Stainless Steel Grades
| Grade | Yield Strength | Corrosion Resistance | Relative Cost |
|---|---|---|---|
| 316L | ~205 MPa | Good | Low |
| S31803 (1.4462) | ≥450 MPa | Very Good | Medium |
| S32750 (1.4410) | ≥550 MPa | Excellent | High |
ASTM A790 UNS S31803 Pipe Pressure Rating
| Pipe O.D. (In.) |
Wall Thickness Of Pipe (Inches) | |||||||
|---|---|---|---|---|---|---|---|---|
| .028 | .035 | .049 | .065 | .083 | .095 | .109 | .120 | |
| Working Pressure (Psig) | ||||||||
| 1/8 | 7900 | 10100 | ||||||
| 1/4 | 3700 | 4800 | 7000 | 9500 | ||||
| 5/16 | 3700 | 5400 | 7300 | |||||
| 3/8 | 3100 | 4400 | 6100 | |||||
| 1/2 | 2300 | 3200 | 4400 | |||||
| 3/4 | 2200 | 3000 | 4000 | 4600 | ||||
| 1 | 2200 | 2900 | 3400 | 3900 | 4300 | |||
Is ASTM A790 UNS S31803 suitable for seawater?
Yes, it performs well in seawater and brine systems up to moderate temperatures, significantly outperforming 316L.
What is the maximum recommended service temperature?
Continuous service is typically limited to ~280–300°C to avoid phase embrittlement.
Is UNS S31803 magnetic?
Yes, due to its ferritic phase, duplex stainless steel is partially magnetic.
Can ASTM A790 S31803 replace 316L pipes?
In many corrosive and high‑pressure applications, S31803 can replace 316L with longer service life and reduced wall thickness.
GNEE, as a reliable supplier of ASTM A790 UNS S31803 pipes, provides UNS S31803 seamless and welded pipes with full traceability, along with EN 10204 3.1 material test certificates (MTC) confirming solution annealing and rapid quenching heat treatment records, dimensional inspection, and optional non-destructive testing (ultrasonic testing/eddy current testing/hydrostatic testing).
10. Ordering Information & Buyer Guidance
ASTM A790 UNS S31803 duplex stainless steel pipes are available in a wide range of ODs, wall thicknesses, and lengths, with customization for pressure rating, surface condition, and testing requirements.
▶ Typical supply forms:
Seamless pipes (hot finished / cold drawn)
Welded pipes (ERW / EFW)
Cut lengths or random lengths
When requesting a quotation, buyers should specify:
Pipe size (OD × WT)
Delivery condition (solution annealed)
Testing requirements (hydro / NDT)
Application environment (seawater, chemical, pressure service)
Choosing the correct specification at the RFQ stage helps reduce lead time, control costs, and ensure long-term performance.
If your project requires this type of service, please contact us for a quote according to the requirements mentioned above!
A790 UNS S31803 pipe Price list(For reference only)
| ASTM A790 UNS S31803 Seamless Pipe Price | ASTM A790 S31803 Pipe Price in USD |
|---|---|
| Duplex SS Pipes Sa790 Gr.uns S31803 Nps5 (Dn 125) Sch. 160 Sml Asme B36.10 | USD 1114.84 |
| Dss Pipe Dn 80 (Grade Uns S31803) (6 Mtrs) | USD 1016.84 |
| Dss Pipe Dn 25 (Grade 1.4462/ Uns S31803) (24 Mtrs) | USD 1576.90 |
| Duplex pipe (38.1x1.65x5880mm) (Uns S31803) 93 Pcs | USD 9160.03 |
| Duplex Stainless Steel Welded pipe To Specification Sa 789 Uns S31803/ | USD 893.69 |
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