Stainless steel 904L fittings

Austenitic Stainless Steel 904L

Stainless steel 904L (UNS N08904) is a high alloy austenitic stainless steel. Compared with 316L, 904L has lower carbon content, higher chromium content, and approximately twice the nickel and molybdenum content.It has higher high-temperature oxidation resistance, pitting resistance, and resistance to reducing acid (e.g., sulfuric acid). Nitrogen can reduce the rate of chromium carbide precipitation, thereby reducing the sensitivity of sensitization, and it also improves the resistance to pitting and crevice corrosion caused by chlorides.Especially its addition of copper makes it useful for all concentrations of sulfuric acid.

Austenitic stainless steel 904L / UNS N08904 / W.Nr. 1.4539

Applications of stainless steel 904l:

  • 904L stainless steel is used widely in petroleum, chemical, fertilizer, marine development towers, tanks, pipes and tubes, and heat exchangers.
  • Rolex and other watch manufacturers also use it to make watches.

Normal product forms:

  • Round, Square, Hexagon, Flat Bars & Wires
  • Seamless / Welded Pipes & Tubes
  • Hot & Cold Rolled Plates & Sheets
  • Forged Bars
  • Forged Flanges
  • Butt-Weld Pipe Fittings
  • Socket-Weld/Forged Pipe Fittings
  • Machined Components

Specifications/Standard: ASTM A 182, ASTM A 240, ASTM A249, ASTM A 312, ASTM A403 and ASTM A479.

Chemical Composition:
  • Chromium (Cr): 19.0-23.0%
  • Nickel (Ni): 23.0-28.0%
  • Molybdenum (Mo): 4.0-5.0%
  • Copper (Cu): 1.0-2.0%
  • Carbon (C): 0.02% max
  • Silicon (Si): 1.00% max
  • Manganese (Mn): 2.00% max
  • Phosphorus (P): 0.045% max
  • Sulfur (S): 0.030% max
  • Nitrogen (N): 0.10% max

Physical Constants and Thermal Properties

  • Density: 7.95 g/cm³
  • Specific Heat: 0.11 BTU/lb-°F (32 – 212°F), 450 J/kg-°K (0 – 100°C)
  • Electrical Resistivity: 33.5 Microhm-in at 68°F, 95.2 Microhm-cm at 20°C
  • Melting Range: 2372 – 2534°F, 1300 – 1390°C
  • Modulus of Elasticity: 28.0 x 10^6 psi, 190 GPa
  • Thermal Conductivity: 6.8 BTU/Ft-hr-°F at 212°F (100°C)

Mechanical Property:

  • Tensile Strength: ≥ 490 MPa (71 ksi)
  • Yield Strength: ≥ 220 MPa (31 ksi)
  • Elongation in 50 mm (2 in.): ≥ 35%
  • Rockwell Hardness (HRBW): ≤ 90

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