Sandvik 25.10.4.L is a nitrogen alloyed duplex chromium-nickel-molybdenum strip electrode used in electro-slag welding (ESW) to deposit a second and third layer corrosion resistant alloy of 25%Cr/10%Ni/4%Mo/N composition on carbon- and low alloyed steels.
The buffer layer can be deposited using Sandvik 25.10.4.L, but when the carbon- or low alloyed steel component require post weld heat treatment the buffer layer is welded using Sandvik 24.13.L with heat treatment before subsequent layers.
The grade is characterized by:
- Excellent resistance to stress corrosion cracking (SCC) in chloride-bearing environments
- Excellent resistance to pitting and crevice corrosion
- High resistance to general corrosion
- High resistance to erosion corrosion and corrosion fatigue
- ISO 14343: 25 9 4 N L
- AWS A5.9/ASME SFA5.9: EQ2594
Contact your nearest sales office for details.
Chemical composition (nominal) %
The ferrite is nominally FN 50 according to WRC-92.
The high corrosion resistance of overlays using SANDVIK 25.10.4.L, makes it suitable for use in aggressive environments such as chlorinated seawater and acidic, chloride containing media up to temperatures of 280°C.
Typically the grade is found in found in seawater applications, chloride-containing bleaching environments in the pulp and paper industry and the chemical industry.
Forms of supply
Strip electrodes are delivered in coils with internal diameter 305 mm.
|Standard dimensions||0.5 x 30, 60, 90, 120 mm|
|0.4 x 50, 75, 150 mm|
|Max coil weight||700 kg|
Weld metal characteristics
Typical chemical composition of overlay in two layers without heat-treatment, and three layers including intermediate heat-treatment after buffer layer welding.
|Sandvik||Type of overlay||C||Cr||Ni||Mo||N||FN, WRC||PRE*|
Consider the figures as examples. Parameters selected and conditions influence the result. Please contact Sandvik for details and guidelines.
*) PRE = %Cr + 3.3 x %Mo + 16 x %N
Passes side bend testing according to ASME Section IX.
The corrosion resistance of a milled cladding surface meets the following criteria:
- The overlay obtained meets 40°C in ASTM G48A testing
- CPT value of 45°C according to ASTM G48E
For electro-slag welding (ESW) and submerged arc welding (SAW), weld fluxes are used for protective shielding of the weld metal.
Recommended fluxes for Sandvik 25.10.4.L