Seamless Stainless Steel TP904L |UNS N08904|1.4539 Tube
Distinguished by its high Nickel and Molybdenum content with 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 tubes are indispensable for mission-critical applications in chemical reactors, seawater cooling systems, and pharmaceutical processing. Through advanced cold-drawing and precise solution annealing, we ensures every tube 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 Tube (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 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
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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CONTACT US
Lidun Industrial Park, Lidun Town, Zhouning County, Ningde City, Fujian Province，355400，China
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