904L stainless steel

904L stainless steel consists of chromium, nickel, molybdenum and copper contents, these elements give type 904L stainless steel excellent properties to resist corrosion in dilute sulfuric acid because of addition of copper, 904L commonly is used in high pressure and corrosion environment where 316L and 317L perform poorly.

904L has high nickel composition with low carbon content, copper alloy adding improve its resistance to corrosion, the “L” in 904L stands for low carbon, it is typical Super Austenitic stainless steel, equivalent grades are DIN 1.4539 and UNS N08904, 904L has better properties than other austenitic stainless steels.

904L Stainless Steel Chemical Composition (Max %):

Grade Ni Cr Mo Cu C Mn Si P S Fe
904L 23 – 28 19 – 23 4 -5 1 – 2 0.02 2 1 0.045 0.035 Balance

904L Stainless Steel Mechanical Properties

Grade Tensile Strength, Min Yeild Strength, Min Elognation Hardness
904L 490 Mpa 215 Mpa 35% 90 HRB Max

904L Stainless Steel Physical Properties

Grade Density
(Kg/M3)
Elastic Modulus
(GPa)
Mean Co-Eff Of
Thermal Expansion
(Μm/M/°C)
Thermal Conductivity
(W/M.K)
Specific Heat 0-100°C
(J/Kg.K)
Elec Resistivity
(NΩ.M)
0-100°C 0-315°C 0-538°C At 20°C At 500°C
904L 7900 190 15 11.5 500 952
904L Stainless Steel Properties
904L Stainless Steel Limitation

904L stainless steel price is expensive, due to high amount of molybdenum and nickel content, that leads to grade 904L is replaced by low cost grades, such as 316L, 317L, 2205, 6Mo and super duplex grades.

904L Stainless Steel Pipe Standards

904L Stainless Steel Tube Standards

904L Stainless Steel Applications

Because of above properties, 904L stainless steel pipe can be used in many applications, these range from utility scrubber assemblies to acid and fertilizer production equipment, pulp and paper processing, seawater cooling facilities. Used in processes containing sulfuric or phosphoric acids, 904L displays its excellent resistance to corrosion from those acids. The paper, gas, pharmaceutical and chemical industries also use 904L for its resistance and use to 400-450 degrees C. Alloy 904L tubing can be welded, machined, heat treated, annealed, hardened and cold worked for many purposes.


Chrome Moly Pipe
ASTM A335 Pipe is a seamless ferritic Alloy-Steel Pipe for high temperature service.
Low temperature pipe
ASTM A333 (ASME S/A-333) Pipe grades permit low temperature service.

Alloy steel specification, Standard and identification

Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.

ASTM A335 P11 alloy pipe