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904L

UNS N08904, commonly known as 904L with its DIN equivalent W.Nr. 1.4539, is a low carbon super austenitic stainless steel. It has superior corrosion resistance to that of conventional Cr-Ni stainless steels such as SS316L and SS317L resulting from the deliberate addition of copper content. Although the 904L stainless steel has limited use with hydrochloric acids, it has high resistance to pitting corrosion in chloride solutions, high resistance to both crevice and stress-corrosion cracking. The grade is non-magnetic and has excellent formability and weldability, as well as good toughness in cryogenic temperatures. 904L stainless steels have greater resistance to precipitation of ferrite and sigma phases on cooling and welding. The low carbon content reduces the risk of intercrystalline corrosion on cooling or welding processes. This super austenitic stainless steel is widely used in chemical processing, oil & gas, and pharmaceutical industries.

ASTM A312 UNS N08904(904L) seamless pipes

ASTM A312 UNS N08904(904L) seamless pipes, 12.7mmx1.25mmx6m.

1. Chemical Composition of 904L

The Chemical Composition of 904L, %
C≤0.020
Mn≤2.00
P≤0.045
S≤0.035
Si≤1.00
Cr19.0-23.0
Ni23.0-28.0
Mo4.0-5.0
N≤0.10
Cu1.0-2.0

2. Mechanical Properties of 904L

Tensile Strength, min.Yield Strength, min.Elongation, min.
ksiMpaksiMpa%
714903122035

3. Physical Properties of 904L

ASTM A276 904L (UNS N08904) round bars, Φ70mm.

ASTM A276 904L (UNS N08904) round bars, Φ70mm.

DensitySpecific HeatThermal ConductivityThermal ExpansionModulus ElasticityElectrical Resistivity
g/cm3J/(kg*K)W/(m*k)mm/m/°CGpaµohm/cm
7.9545011.515.81909.52

4. Product Forms and Relative Standards

Product FormStandard
Plates, Sheets & StripsASATM A240, A480
Bars, Rods, BilletsASTM A276, A479
Forging(flanges, fittings, valve parts)ASTM A182, A484
Seamless and welded pipes/ TubesASTM A312, A269
Butt Welding pipe fittingsASTM A403, ASME B16.9

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Austenitic Stainless Steel

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