Seamless Duplex Steel S31803 |UNS S31803|1.4462 Pipe
Our S31803 duplex pipes offer a strategic combination of high yield strength—nearly double that of conventional 300-series stainless steels—and outstanding resistance to chloride-induced stress corrosion cracking (SCC) and pitting. While UNS S31803 is the foundational duplex grade, Tengqi ensures every pipe meets the most rigorous industrial requirements through hydrostatic and ultrasonic testing. Through advanced cold-drawing and precision solution annealing, we guarantee optimal phase balance and a high-integrity surface finish for long-term reliability in petrochemical, marine, and energy infrastructure.
"Our S31803 pipes are often dual-certified to meet S32205 standards, ensuring a Pitting Resistance Equivalent Number (PREN) ≥ 35 for superior performance."
Seamless Duplex Steel UNS S31803 Pipe (S31803 / UNS S31803 / W.Nr. 1.4462) is the standard 22% Cr duplex grade with roughly twice the yield strength of 304/316. Manufactured by Tengqi in Fujian, China, every heat is fully traceable, hydro-tested and available with third-party inspection (SGS / BV / TUV) on request.
Product Specifications
- ASTM A790 / ASME SA790 — Seamless & Welded
- ASTM A999 / A999M — General Requirements
- EN 10216-5 — Seamless Pressure Tubing
- Finishing: solution annealed, pickled & polished; bright annealed available on request
Size Range
| Outside Diameter (OD) | Wall Thickness | Length |
|---|---|---|
| 6 mm – 1016 mm (1/4"– 40") | 0.5 mm – 65 mm | 6 m / 12 m, or as required |
Chemical Composition
S31803 (UNS S31803) — Composition %
| UNS | C | Mn | P | S | Si | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|---|
| S31803 | ≤ 0.030 | ≤ 2.00 | ≤ 0.030 | ≤ 0.020 | ≤ 1.00 | 21.0 – 23.0 | 4.5 – 6.5 | 2.5 – 3.5 | 0.08 – 0.20 |
Mechanical Properties
| Property | Value |
|---|---|
| Delivery Condition | Solution annealed, pickled & polished |
| Tensile Strength | ≥ 620 MPa |
| Yield Strength (0.2% offset) | ≥ 450 MPa |
| Elongation in 2 in. / 50 mm | ≥ 25% |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.8 g/cm3 |
| Thermal Conductivity | 17.0 W/m·K |
| Specific Heat Capacity | 480 J/kg·K |
| Elastic Modulus | 200 GPa |
| Magnetic Properties | Magnetic |
| PREN (Pitting Resistance Equivalent) | 32.0-35.0 |
Industry Applications
Related Products
Related Seamless Pipes & Tubes
Explore more grades and sizes from XTD Special Steel — related seamless pipe and tube products:
- Seamless Duplex Steel S31803 Tube
- Seamless Duplex Steel S32205 Pipe
- Seamless Duplex Steel S31500 Pipe
- Seamless Duplex Steel S32205 Tube
- Seamless Duplex Steel S31500 Tube
Browse the complete ranges: All Duplex Steel Pipes | Explore Duplex Steel Tubes | Seamless Stainless Steel Pipes Catalog
CONTACT US
Lidun Industrial Park, Lidun Town, Zhouning County, Ningde City, Fujian Province，355400，China
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