AISI 904 L DIN 1.

4539 - X 1 NiCrMoCu 25 20 5 AFNOR Z 2 NC DU 25 20

General characteristics
This steel with high Nickel and Molybdenum contents presents improved corrosion resistance as compare to 316L. It Machinability --
is used in the chemical industry for pipes and tank in contact with corrosive fluids. Quench hardening no
Machining is more difficult than with conventional 316 L. Polishing +
This steel complies with the standard EN 1811 and can be used for products in direct and prolonged contact with
Magnetic no
skin.
Age hardening no
Welding
MIG,TIG,WIG yes
Arc yes
Resistance yes
Autogenous no
Laser no
Chemical composition according to DIN (%)
C Si Mn P S Cr Mo Ni others
< 0.020 < 0.70 < 2.00 < 0.030 < 0.010 19 - 21 4-5 24 - 26 Cu = 1.2 - 2.0
Physical properties
Density Electrical resistivity Specific heat Thermal conductivity
r [kg·m-3] r [µW·m] Cp [J·kg-1·K-1] l [W·m-1·K-1]
8'000 1 450 12
Coefficient of thermal expansion Elastic modulus
a [10-6·°C-1] between 20°C and E [GPa]
100 °C 200 °C 300 °C 400 °C 500 °C 600 °C 700 °C 195 at 20°C
15.8 16.1 16.5 16.9 17.3 - - 165 at 400°C
Mechanical properties
Yield strength Tensile Elongation Vickers
State Rp0.2 [MPa] strength Hardness
20°C 100°C 200°C 300°C Rm [MPa] A5 [%] [HV]
Annealed 220 175 155 135 540 ≥35 150
Full hard 1300 1400 3 430
Thermal treatments
Type Temperature Time Protective atmosphere Cooling
[°C] [minutes]
Annealing 1020 -1080 15 - 60 H2 + N2 or cracked NH3 Rapid
Surface treatments
Type Solution Remarks
Pickling 6 - 25 % HNO3 + 0.5 - 8 % HF Only suitable in annealed condition, hot
Passivation 20 - 50% HNO3 Hot
Fabrication characteristics
This steel can easily be cold rolled, drawn and stamped. However, suitable tooling is required because of its high work hardening rate. This steel is
relatively difficult to machine, modified steels such as PX or PM with the addition of chip breaking additives may be preferred.

Welding, brazing and soldering

This steel can easily be welded by any conventional joining technique, except the oxyacetylene torch. Because of its pure austenitic structure, cracks
may appear when welded with non optimized parameters.
There is no need for any post-weld heat treatment.
Welding electrodes: 1.4539
Available products
Sheets, ribbons, wires, profiles, tubes, dimensions and tolerances on request.
The indications are basically founded on our actual know-how. This technical data sheet is without
commitment and not contracted.