Seamless Alloy 31 |UNS N08031|1.4562 Tube
Distinguished by a high Pitting Resistance Equivalent Number (PREN ≥ 48), our Alloy 31 tubing excels in aggressive environments containing hot concentrated phosphoric acid, sulfuric acid, and high-chloride media. With mechanical strength significantly surpassing standard austenitic steels, these tubes are indispensable for mission-critical applications in flue gas desulfurization (FGD), chemical reactors, and fine chemical processing. Through advanced cold-drawing and specialized solution annealing, we ensures every tube maintains a uniform microstructure and maximum durability for the most demanding industrial conditions.
PREN = %Cr + 3.3X(%Mo + 0.5X%W) + 16X%N≥ 48
Seamless Alloy 31 tube (Alloy31 / UNS N08031 / W.Nr. 1.4562) is a super-austenitic 6% Mo alloy with high chromium and nitrogen for aggressive acidic service. 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 A213 / ASME SA213 — Seamless
- ASTM A269 / A269M — Seamless & Welded
- ASTM A270 / A270M — Sanitary Tubing
- ASTM A1016 / A1016M — 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 |
|---|---|---|
| 6.35 mm – 257 mm (1/4"– 10.1") | 0.5 mm – 12.7 mm | ≤ 22 m |
Chemical Composition
Alloy31 (UNS N08031) — Composition %
| UNS | C | Mn | P | S | Si | Cr | Ni | Mo | Cu | N | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|
| N08031 | ≤ 0.015 | ≤ 2.0 | ≤ 0.020 | ≤ 0.010 | ≤ 0.3 | 26.0 – 28.0 | 30.0 – 32.0 | 6.0 – 7.0 | 1.0 – 1.4 | 0.15 – 0.25 | balance |
Mechanical Properties
| Property | Value |
|---|---|
| Delivery Condition | Solution annealed, pickled & polished |
| Tensile Strength | ≥ 650 MPa |
| Yield Strength (0.2% offset) | ≥ 276 MPa |
| Elongation in 2 in. / 50 mm | ≥ 40% |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.1 g/cm3 |
| Thermal Conductivity | 11.8 W/m·K |
| Specific Heat Capacity | 450 J/kg·K |
| Elastic Modulus | 200 GPa |
| Magnetic Properties | Non-magnetic (slightly magnetic when cold worked) |
| PREN (Pitting Resistance Equivalent) | 45.0-48.0 |
Industry Applications
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