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
Excellent resistance to stress corrosion cracking due to the presence of high amounts of nickel content.
Pitting and crevice corrosion, intergranular corrosion resistance.
Grade 904L is less resistant to nitric acid.
Excellent formability, toughness and weldability, due to low carbon composition, it can be welded using any standard method, 904L cannot be hardened by heat treatment.
Non-magnetic, 904L is an Austenitic stainless steel, therefor 904L possesses Austenitic structure properties.
Heat Resistance, Grade 904L stainless steels offer good oxidation resistance. However, the structural stability of this grade collapses at high temperatures, particularly above 400°C.
Heat Treatment, Grade 904L stainless steels can be solution heat-treated at 1090 to 1175°C, following by rapid cooling. Thermal treatment is suitable for hardening these grades.
904L Stainless Steel Equivalents
WERKSTOFF NR 1.4539
UNS N08904
BS 904S13
SMLS Pipe 904L A312 45 mm x 5 mm UNS N08904 Stainless Steel Seamless Tube
