ASTM A790 S31803/S32205 Duplex Stainless Steel Pipe
Apr 28, 2026
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GNEE is an experienced duplex stainless steel manufacturer with over 20 years of export experience, having supplied high-quality duplex stainless steel pipe products to more than 50 countries worldwide. We provide ASTM A790 S31803 / S32205 dual-certified stainless steel seamless and welded pipes, fully compliant with international standards such as ASTM, ASME, and EN.
Our UNS S32205 pipes undergo strict solution annealing followed by rapid water quenching, ensuring an optimal metallurgical structure, complete elimination of harmful sigma phase, and full compliance with ASTM A923 testing requirements. The yield strength of ASTM A790 S32205 stainless steel pipes is approximately twice that of 316L. Where design conditions permit, using thinner wall thickness can help reduce total project weight and material costs by around 20%.
We supply UNS S32205 round pipes in a wide range of outer diameters, wall thicknesses, and SCH schedules, along with value-added services such as annealing, pickling, fixed-length cutting, and customized processing. All products are certified by ISO 9001, PED, SGS, and BV, and are delivered with EN 10204 3.1 Material Test Certificates (MTC), fully meeting customers' stringent requirements for quality and reliability.
What is the difference between S31803 and S32205?
Both S31803 and S32205 are UNS designations for 2205 duplex stainless steel. While they are very similar, S32205 is an upgraded version of S31803, featuring stricter and more optimized control over its chemical composition, thereby offering more reliable corrosion resistance.
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 |
ASME SA 789 S31803 Pipe Mechanical Characteristics
| 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 Seamless 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 Weigh Chart
| NPS (Inch) | OD (mm) | Schedule | Wall Thickness (mm) | Weight ( kg/m ) | Weight (lb/ft) |
| 1/2" | 21.34 | Sch 10S | 2.11 | 1.00 | 0.67 |
| Sch 40S | 2.77 | 1.27 | 0.85 | ||
| Sch 80S | 3.73 | 1.62 | 1.09 | ||
| 3/4" | 26.67 | Sch 10S | 2.11 | 1.28 | 0.86 |
| Sch 40S | 2.87 | 1.69 | 1.13 | ||
| Sch 80S | 3.91 | 2.20 | 1.48 | ||
| 1" | 33.40 | Sch 10S | 2.77 | 2.09 | 1.40 |
| Sch 40S | 3.38 | 2.50 | 1.68 | ||
| Sch 80S | 4.55 | 3.24 | 2.17 | ||
| 1-1/2" | 48.26 | Sch 10S | 2.77 | 3.11 | 2.09 |
| Sch 40S | 3.68 | 4.05 | 2.72 | ||
| Sch 80S | 5.08 | 5.41 | 3.63 | ||
| 2" | 60.33 | Sch 10S | 2.77 | 3.93 | 2.64 |
| Sch 40S | 3.91 | 5.44 | 3.65 | ||
| Sch 80S | 5.54 | 7.48 | 5.02 | ||
| 3" | 88.90 | Sch 10S | 3.05 | 6.45 | 4.33 |
| Sch 40S | 5.49 | 11.29 | 7.58 | ||
| Sch 80S | 7.62 | 15.27 | 10.25 | ||
| 4" | 114.30 | Sch 10S | 3.05 | 8.37 | 5.62 |
| Sch 40S | 6.02 | 16.08 | 10.79 | ||
| Sch 80S | 8.56 | 22.32 | 14.98 | ||
| 6" | 168.28 | Sch 10S | 3.40 | 13.84 | 9.29 |
| Sch 40S | 7.11 | 28.26 | 18.97 | ||
| Sch 80S | 10.97 | 42.56 | 28.56 | ||
| 8" | 219.08 | Sch 10S | 3.76 | 20.00 | 13.42 |
| Sch 40S | 8.18 | 42.55 | 28.55 | ||
| Sch 80S | 12.70 | 64.64 | 43.38 | ||
| 10" | 273.05 | Sch 10S | 4.19 | 27.80 | 18.66 |
| Sch 40S | 9.27 | 60.31 | 40.48 | ||
| Sch 80S | 15.09 | 96.01 | 64.44 | ||
| 12" | 323.85 | Sch 10S | 4.57 | 36.00 | 24.16 |
| Sch 40S | 9.53 | 73.83 | 49.55 | ||
| Sch 80S | 17.48 | 132.04 | 88.62 |
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 | |||
ASTM A790 Duplex 2205 pipe price list
| Product Description | Specification | Price (USD) | Price (CNY) |
|---|---|---|---|
| Duplex SS Pipe SA790 Gr. UNS S31803 | NPS 5 (DN 125), SCH 160, SMLS, ASME B36.10 | 869.41 | 5,930 |
| DSS Pipe (UNS S31803) | DN 80, Length: 6 meters | 793.09 | 5,408 |
| DSS Pipe (1.4462 / UNS S31803) | DN 25, Length: 24 meters | 1,229.76 | 8,378 |
| Duplex Stainless Steel Welded Pipe SA789 UNS S31803 | 697.06 | 4,754 |
If you have any project requirements, we welcome your orders. GNEE maintains a substantial inventory of best-selling products for you to choose from. We will provide you with our latest quotation within 24 hours!
Click to Get UNS S32205 Stainless Steel Pipe Prices
HS Code of ASTM A790 UNS S32205 Duplex Pipe
| Pipe Type | Universal HS Code (6-Digit) | China HS Code (10-Digit / Export) |
| Seamless (Cold-finished) | 7304.41 | 7304.4190.00 |
| Seamless (Hot-finished) | 7304.49 | 7304.4990.00 |
| Welded (Circular) | 7306.40 | 7306.4000.00 |
| Welded (Non-Circular) | 7306.69 | 7306.6900.00 |
S32205 Duplex Stainless Steel Pipe Manufacturer
GNEE Stainless Steel maintains a warehouse stocked with common specifications (Sch10/40/80), enabling us to ship orders within 3–5 days of receipt eliminating the need to wait for the steel mill's standard three-month production cycle. Prior to shipment, all products undergo rigorous inspection, including 100% Eddy Current Testing (ET), 100% Ultrasonic Testing (UT), and 100% Positive Material Identification (PMI).
Our 2205 stainless steel pipes are fitted with plastic end caps (to prevent dust ingress), separated by protective layers between rows (to prevent scratching), and packaged in fumigation-free wooden crates or U-shaped iron racks.
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