Product Information

Composition of Super Austenitic 904L Pipe and Tubing

Grade 904L
UNS Designation N08904
Nickel (Ni) 23.0 – 28.0
Chromium (Cr) 19.0 – 23.0
Iron (Fe) Bal.
Molybdenum (Mo) 4.0 – 5.0
Titanium (Ti) Max.
Aluminum (Al) Max.
Cobalt (Co) Max.
Tungsten (W)
Vanadium (V) Max.
Copper (Cu) Max. 1.00 – 2.00
Manganese (Mn) Max. 2.00
Niobium (Nb) plus Tantalum
Carbon (C) Max. 0.020
Nitrogen (N) Max. 0.10
Silicon (Si) Max. 1.00
Sulphur (S) Max. 0.035
Phosphorous (P) Max. 0.045
Other Elements

Physical Properties of Super Austenitic 904L Alloys in the Annealed Condition at -20°F to +100°F

      Tensile Strength Yield Strength            
Alloy UNS Designation Spec. psi MPa ksi psi MPa ksi Elongation in 2 in. (min.) % Grain Size Req. Max. Hardness Modulus of Elasticity (x106 psi) Mean Coefficient of Thermal Expansion (IN./IN./°F x 10-6) Thermal Conductivity (BTU-in/ ft2-h-°F)
904L N08904 A249, A312 71,000 490 71 31,000 215 31 35 90 Rb 28.0 8.5 79
904L N08904 B673, B674 71,000 490 71 31,000 215 31 35 8.5 79

Super Austenitic 904L Product Range

Alloy UNS Designation Werkstoff NR. Specifications*
904L N08904 1.4539 A269, A/SA249, B/SB674, A/SA312, B/SB673

*Note: The specifications noted including ASTM, ASME, or other applicable authorities are correct at the time of publication. Other specifications may apply for use of these materials in different applications.