Seamless Stainless Steel TP310MoLN |UNS S31050|1.4466 Tube
Distinguished by its optimized chemistry—high Chromium (25%) and Nickel (22%) with strategic Molybdenum and Nitrogen additions—our 310MoLN tubing offers superior strength and optimized resistance to pitting and crevice corrosion in nitric acid and chloride-rich media. These tubes are indispensable for mission-critical equipment, including urea strippers, condensers, and high-pressure piping systems. Through advanced cold-drawing and precise solution annealing, Tengqi ensures a stable austenitic microstructure free from intermetallic phases for maximum service life.
"Specially designed for Urea Plant applications with extremely low corrosion rates in Huey tests."
Seamless Stainless Steel TP310MoLN Tube (TP310MoLN / UNS S31050 / W.Nr. 1.4466) is a 25/22 austenitic grade with molybdenum and nitrogen additions, designed for continuous high-temperature service in oxidizing atmospheres and for urea / nitric-acid service where enhanced pitting and intergranular corrosion resistance is required. 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
TP310MoLN (UNS S31050) — Composition %
| UNS | C | Mn | P | S | Si | Cr | Ni | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| S31050 | ≤ 0.020 | ≤ 2.00 | ≤ 0.020 | ≤ 0.010 | ≤ 0.40 | 24.0 – 26.0 | 20.5 – 23.5 | 1.60 – 2.60 | 0.09 – 0.15 | ≤ 0.50 |
Mechanical Properties
| Property | Value |
|---|---|
| Delivery Condition | Solution annealed, pickled & polished |
| Tensile Strength | ≥ 540 MPa |
| Yield Strength (0.2% offset) | ≥ 240 MPa |
| Elongation in 2 in. / 50 mm | ≥ 35% |
Physical Properties
| Property | Value |
|---|---|
| Density | 7.98 g/cm3 |
| Thermal Conductivity | 14.2 W/m·K |
| Specific Heat Capacity | 500 J/kg·K |
| Elastic Modulus | 200 GPa |
| Magnetic Properties | Non-magnetic (slightly magnetic when cold worked) |
| PREN (Pitting Resistance Equivalent) | 24.0-26.0 |
Industry Applications
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