Seamless Stainless Steel TP904L |UNS N08904|1.4539 Pipe
Distinguished by its high Nickel and Molybdenum content and the strategic addition of Copper (Cu), our 904L tubing offers superior resistance to strong reducing acids, particularly dilute sulfuric acid, across the entire concentration range. These pipes are indispensable for mission-critical applications in chemical reactors, seawater cooling systems, and pharmaceutical processing. Through advanced cold-drawing and precise solution annealing, ensures every pipe maintains a uniform microstructure and optimized mechanical strength for the most demanding industrial environments.
PREN≥35,higher than TP316L PREN≥24
Seamless Stainless Steel TP904L Pipe (904L / UNS N08904 / W.Nr. 1.4539) is a super-austenitic grade with high nickel and molybdenum for sulfuric and phosphoric acid 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 A312 / ASME SA312 — Seamless & Welded
- ASTM A999 / A999M — General Requirements
- ASTM A213 / ASME SA213 — Seamless
- 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
904L (UNS N08904) — Composition %
| UNS | C | Mn | P | S | Si | Cr | Ni | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| N08904 | ≤ 0.020 | ≤ 2.00 | ≤ 0.040 | ≤ 0.030 | ≤ 1.00 | 19.0 – 23.0 | 23.0 – 28.0 | 4.0 – 5.0 | ≤ 0.10 | 1.00 – 2.00 |
Mechanical Properties
| Property | Value |
|---|---|
| Delivery Condition | Solution annealed, pickled & polished |
| Tensile Strength | ≥ 490 MPa |
| Yield Strength (0.2% offset) | ≥ 215 MPa |
| Elongation in 2 in. / 50 mm | ≥ 35% |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm3 |
| Thermal Conductivity | 12.0 W/m·K |
| Specific Heat Capacity | 450 J/kg·K |
| Elastic Modulus | 195 GPa |
| Magnetic Properties | Non-magnetic (slightly magnetic when cold worked) |
| PREN (Pitting Resistance Equivalent) | 34.0-36.0 |
Industry Applications
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