ASTM A312 TP904L Stainless Steel Seamless Pipe Acid Resistant

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.

Zhejiang seamless pipe co.,ltd. (SMLSCO) is a specialized stainless steel piping systems provider with 19 years of industry experience. We began by supplying cost-effective stainless steel seamless pipes but for now, Smlsco is more than pipes.

With 19 years of growth, we have established production centers, warehouses, and sales offices strategically located in Wenzhou and Jiaxing. This strategic layout brings us closer to China's steel industry and economic hubs, enabling us to offer a wider range of products and provide more professional and efficient services to our customers.

SMLSCO’s extensive inventory and years of experience enable us to deliver high-quality stainless steel products on time, every time,and lead to long-term partnerships with clients from over 100 countries and regions.