ASME SA312 TP904L , UNS N08904 , 1.4539 Stainless Steel Seamless Pipe For Chemical Industry
ASME SA312 TP904L , UNS N08904 , 1.4539 Stainless Steel Seamless Pipe For Chemical Industry
ASME SA312 TP904L Stainless Steel Seamless Pipe is a high-alloy austenitic stainless steel pipe manufactured under the ASME SA312/SA312M specification, which is essentially identical to ASTM A312/A312M. It is intended for high-temperature and general corrosive service, especially in chemical, petrochemical, marine, and acid-handling environments. ASME SA312 TP904L Stainless Steel Seamless Pipe is a high-alloy austenitic stainless steel pipe with UNS N08904. It combines high nickel, molybdenum, and copper to provide outstanding resistance to acids, chlorides, pitting, and crevice corrosion. It is commonly supplied in NPS 1/8" to 24", schedules 5S to XXS, in solution-annealed and pickled, bright-annealed, or polished condition. It is widely used in chemical, petrochemical, marine, fertilizer, pharmaceutical, and pollution-control industries where 316L or 317L would not provide sufficient corrosion resistance.
Chemical Composition(%):
| C | Mn | P | S | Si | Cr | Ni | Mo | Cu | Fe |
| ≤0.020 | ≤2.00 | ≤0.045 | ≤0.035 | ≤1.00 | 19.0–23.0 | 23.0–28.0 | 4.0–5.0 | 1.0–2.0 | Balance |
Mechanical Properties:
| Tensile Strength, Rm | ≥490 MPa |
| Yield Strength, Rp0.2 | ≥215 MPa |
| Elongation (A) | ≥35% |
| Hardness (HB) | ≤215 HB |
| Hardness (HV) | ≤230 HV |
Main Features of ASME SA312 TP904L Seamless Pipes:
Excellent general corrosion resistance
High resistance to pitting and crevice corrosion
Resistance to intergranular corrosion
Good stress corrosion cracking (SCC) resistance
Good ductility and weldability
Typical Applications:
- Chemical industry: Sulfuric acid & phosphoric acid production, acid transport pipelines, reactors piping
- Fertilizer industry: Phosphate fertilizer process lines
- Desalination & seawater handling: Brine pipelines, seawater cooling systems
- Pulp & paper industry: Bleaching process piping
- Flue gas desulfurization (FGD) systems for power plants
- Oil & gas: Chloride-rich produced water pipelines
- Pharmaceutical: Corrosive media process piping
- Wastewater treatment: Corrosive waste liquid transfer
- Food processing: Strong acid cleaning circuit piping
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