ASTM A312 TP904L Stainless Steel Seamless Pipe Acid Resistant
Why Choose SMLSCO Pipe Stock?
SMLSCO maintains 2000 tons of TP904L pipe year-round (Sch10s–80), with standard specifications shippable within two weeks. Centralized procurement of high-alloy billets and scaled cold-drawing processes optimize cost efficiency – empowering distributors with dual competitive edge in pricing and lead time for high-corrosion applications.
Standard: ASTM A312
Grade: TP904L (UNS N08904)
Outside Diameter: 1/4" – 24"
Wall Thickness: Sch5s – XXS
Length: 6 m
Manufacturing: Cold‑drawn Seamless
Surface Finish: Annealed & Pickled
Certification: ISO 9001, PED
904L Chemical / Mechanical Properties
Composition:
Ni: 23–28% Cr: 19–23% Mo: 4–5% Cu: 1–2% C: ≤0.02%
Mechanical:
Tensile Strength: ≥490 MPa Yield Strength: ≥220 MPa Elongation: ≥35%
The high Ni-Mo-Cu formulation significantly enhances resistance to sulfuric/phosphoric acids and chloride crevice corrosion, ensuring long-term performance in acidic systems.
904L Material Properties
TP904L is a super-low-carbon, high-alloy austenitic steel delivering exceptional acid resistance, pitting resistance, and stress corrosion cracking (SCC) immunity. It remains stable even in concentrated sulfuric acid above 70°C, with no sensitization in weld zones – providing global distributors with premium ready-stock solutions for extreme corrosive media.
904L Seamless Pipe Application:
904L seamless pipes are widely used in:
• Phosphoric acid fertilizer plants
• Sulfuric acid production systems
• Pulp bleaching equipment
• Seawater desalination units
• Chlorinated organic chemical transfer lines
Their superior acid resistance enables industrial distributors to rapidly address downstream acidic pipeline upgrades and replacement part demands, minimizing downtime risks.
Superior Acid Resistance of TP904L
TP904L delivers unparalleled acid resistance through its optimized high-nickel (23–28%), molybdenum (4–5%), and copper (1–2%) composition. This synergy creates exceptional defense against sulfuric, phosphoric, and organic acids – particularly excelling in concentrated sulfuric acid environments above 70°C where standard stainless steels fail. The alloy's ultra-low carbon (≤0.02%) prevents carbide precipitation during welding, eliminating sensitization in heat-affected zones. Combined with inherent resistance to chloride-induced pitting and stress corrosion cracking (SCC), TP904L maintains structural integrity in aggressive media like phosphoric acid production, pickling systems, and chlorinated solvent transfer. This corrosion immunity ensures minimal maintenance and extended service life in critical acid processing applications.
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