Oerlikon Inertfil 25 10 4 description: INERTFIL 25 10 4 is used for the welding of Super-Duplex stainless steels. Mainly used in Offshore applications, paper industry, oil industry and artificial manure production. This type is often used for root pass welding of 22%Cr standard duplex steels for critical applications, also for the welding of low carbon super martensitic 13%Cr steels.
INERTFIL 25 10 4 has a very good resistance to general corrosion, the weld metal has a high resistance to pitting with a PREN>40 value combined with a good resistance to crevice corrosion as well as stress corrosion cracking. The nickel over matches the parent material by 2-3% to provide an optimum balance of austenite and ferrite in the as welded condition.