SAF Lexal W 25 10 4 N description: LEXAL W 25 10 4 N has a very good resistance to general corrosion, the weld metal has a high resistance to pitting with a PREN value >40 combined with a good resistance to both crevice corrosion and stress corrosion cracking. The weld metal nickel content over matches the parent material by 2-3% to provide for an optimum balance of austenite and ferrite in the as-welded condition.