904L

904L is a stainless steel alloy that displays high resistance to corrosion, particularly against acidic environments. Additions of copper and carbon give it distinct characteristics, with the copper serving as a strengthening agent against corrosive acids. The small amount of carbon in its compositions gives 904L increased weldability and cleanliness against continual wear and tear. The combination of chromium, nickel, molybdenum and copper in its makeup serve to give 904L exceptional resistance against sulfuric acid. The metal was developed to prevent corrosion where such acids are utilized or applied. Therefore, 904L is approved for use in acid production and concentration, along with the transport of such substances.
In terms of working, both hot and cold working practices can be applied; however, the metal does not harden in response to hot working, only cold. Most common operations like those used to treat grades 304, 316 and 317 stainless steels are also effective on 904L. Additionally, the metal is slow to harden when being worked on and most welding methods are sufficient to yield desired results.

Oil & Gas Industry

Specifications – 904L

Standard904L
UNSN08904
Werkstoff Nr.1.4539
EN X1NiCrMoCu25-20-5
BS904S13
KSSTS 317J5L
JISSUS 890L
AFNOR Z2 NCDU 25-20

Physical Properties – 904L

Density 7.95 g/cm 3 / 0.285 lb/in 3
Melting Point 1315 -1390 (°C) / 2399 – 2534 (°F)
Modulus of Elasticity28.0 x 106 psi
Specific Heat @ 70°F0.11 BTU/lb-°F
Thermal Conductivity @ 212°F6.8 BTU/Ft-hr-°F
Electrical Resistivity @ 70°F9.52 μohm/cm
Annealed1075 – 1125(°C) / 1965 – 2055 (°F)
QuenchRapid Air/Water

Chemical Composition – 904L

ElementComposition
Ni23.0 – 28.0
Cu1.0 – 2.0
C0.20 max
Mn2.0 max
P0.040 max
S0.030 max
Si1.0 max
Cr19.0 – 23.0
Mo4.0 – 5.0
N0.10 max
FeBal* (38.63 min)

*Calculated , Reference Only

Pharmaceutical Industry

904L Products

Pipes & Tubes
Tubing
Seamless Pipe
Round Bar
Square Bar
Hex Bar
Sheet
Coil
Plate
Elbow / Bends
Fitting-Flanges-Reducer
Fitting-Flanges-Stubend
Fitting-Flanges-cap
Flanges-sorf-wnrf
Fitting-Flanges-fasteners
Wire-filler
Wire-coil
Wire-spool