Alloy 904L / UNS N8904 Stainless Steel Pipes Tubing Seamless Steel Pipe for Chemical Area

Key Parameters

Chemical Composition of 904L Stainless Steel Pipe

• Carbon (C): ≤0.03%
• Chromium (Cr): 18.0–20.0%
• Nickel (Ni): 23.0–25.0%
• Molybdenum (Mo): 3.0–4.0%
• Copper (Cu): 4.0–5.0%
• Manganese (Mn): ≤2.00%
• Silicon (Si): ≤1.00%
• Phosphorus (P): ≤0.035%
• Sulfur (S): ≤0.030%

Mechanical Properties of 904L Stainless Steel Pipe

• Tensile Strength: ≥490 MPa
• Yield Strength (0.2% Offset): ≥216 MPa
• Elongation at Break: ≥35%
• Hardness: ≤230 HB

Physical Properties of 904L Stainless Steel Pipe

• Density: 8.24 g/cm³
• Melting Point: 1300–1390°C
• Thermal Conductivity: ~10 W/m·K (at 100°C)
• Maximum Service Temperature: 450°C

Standards of 904L Stainless Steel Pipe

• ASTM A312 / ASME SA-312 (seamless and welded pipes)
• EN 10216-5 (seamless steel tubes for pressure purposes)
• DIN 1.4539 (German standard equivalent)
• JIS SUS 890L (Japanese specification)
• ASTM B677 (seamless tubes for general corrosion resistance)

Performance Advantages of 904L Stainless Steel Pipe

1. Exceptional Corrosion Resistance
   • Acidic Environments: Resistant to sulfuric, phosphoric, and acetic acids, even at high concentrations .
   • Chloride Resistance: Strong immunity to pitting, crevice corrosion, and stress corrosion cracking (SCC) in chloride-rich media like seawater and brine .
   • Passive Film Stability: High chromium and molybdenum content form a protective oxide layer, ensuring long-term durability .
2. Mechanical Integrity
   • Retains strength and toughness across a wide temperature range, including cryogenic conditions .
   • Excellent weldability with nickel-based fillers (e.g., Alloy 625) .
3. Formability
   • Easy to fabricate into complex shapes without compromising corrosion resistance .

Equivalent Grades

• UNS N08904 (USA)
• EN 1.4539 / DIN 1.4539 (Europe)
• JIS SUS 890L (Japan)
• 00Cr20Ni25Mo4.5Cu (China)
• NAS 255 (Japan)

Packaging of 904L Stainless Steel Pipe

• Protected Internally/Externally: Coated with anti-corrosive oil or plastic film .
• Ends Sealed: Fitted with plastic caps to prevent debris ingress .
• Bundle Secured: Wrapped in waterproof paper or woven fabric, then strapped with steel bands or placed in wooden crates .
• Marine-Grade Packaging: Suitable for long-distance shipping, including ocean transport .

Applications of 904L Stainless Steel Pipe

1. Chemical Processing
   • Reactors, heat exchangers, and pipelines handling sulfuric acid, fertilizers, and organic solvents .
2. Oil & Gas
   • Offshore platforms, seawater injection systems, and refinery equipment exposed to chloride and H₂S .
3. Pharmaceutical & Food Industries
   • Sanitary pipelines and reactors requiring corrosion resistance and compliance with hygiene standards .
4. Environmental Engineering
   • Flue gas desulfurization (FGD) systems, wastewater treatment plants, and acid recovery units .
5. Marine & Desalination
   • Seawater desalination plants, condensers, and marine heat exchangers .