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Material Specification

AISI 904L

AISI 904L Fasteners
High-Moly Super Austenitic Stainless Steel (UNS N08904 / 1.4539)

High Moly Stainless Steel AISI 904L Fasteners

Buy AISI 904L (UNS N08904 / DIN EN 1.4539 / X1NiCrMoCu25-20-5) bolts, studs, nuts, and custom fasteners from Exotic Alloy, conforming to ASTM A182, ASTM A276, ASTM A479, and NACE MR0175 / ISO 15156. AISI 904L is a high-alloy super austenitic stainless steel containing 4.5% molybdenum, 25% nickel, 20% chromium, and 1.5% copper, engineered specifically for extreme resistance to sulfuric acid and high chloride concentrations.

Exotic Alloy manufactures AISI 904L heavy hex bolts, socket cap screws, all-thread stud bolts, and custom machined bolting in metric (M4 to M100) and imperial (1/4" to 4") sizes. It exhibits superior resistance to pitting, crevice corrosion, and stress corrosion cracking in aggressive acidic and marine environments.

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AISI 904L Bolting Products

AISI 904L Specifications & Standards

  • ASTM A182 / A276 / A479
  • UNS N08904 / AISI 904L
  • NACE MR0175 / ISO 15156
  • DIN EN ISO 10088-3 (1.4539)
  • X1NiCrMoCu25-20-5
  • ISO 3506-1
AISI 904L Material Datasheet

AISI 904L Properties

Chemical Composition (AISI 904L)
Elements C Mn P S Si Cr Ni Mo Cu N Fe
Min % - - - - - 19.00 23.00 4.00 1.20 - Balance
Max % 0.020 2.00 0.040 0.015 0.70 23.00 28.00 5.00 2.00 0.10 Balance
Mechanical Properties (AISI 904L)
Condition / Heat Treatment Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Hardness
Solution Annealed (Bar / Fasteners) 490 - 700 220 35 % 150 - 200 HB

AISI 904L Characteristics

  • Exceptional resistance to sulfuric, phosphoric, and organic acids across broad temperatures.
  • High resistance to pitting and crevice corrosion in warm chloride media (PREN ≥ 36).
  • High nickel content (25%) imparts excellent resistance to chloride stress corrosion cracking.
  • Completely austenitic microstructure with outstanding ductility and toughness down to -196°C.
  • Excellent weldability and cold forming capability without post-weld sensitization.

Applications

  • Sulfuric, phosphoric, and acetic acid manufacturing equipment and piping.
  • Flue-gas desulfurization (FGD) scrubbers and gas ducting bolting.
  • Seawater cooling systems, offshore oil & gas platforms, and marine fasteners.
  • Pulp and paper chlorination and bleaching plant components.
  • Pharmaceutical and fine chemical processing autoclaves and reactors.