Oerlikon Inertfil 312 description: INERTFIL 312 is used for welding of steels such as medium and high carbon steels and dissimilar steel combinations. INERTFIL 312 offer a high tolerance to dilution and is therefore particularly suitable for depositing buffer layers prior to surfacing. The deposited weld metal contains 30% delta-ferrite in a tough austenitic matrix with high resistance to hot cracking. Stainless steel wire for welding and facing hard-to-weld steels. Designed to make intermediate layers of hard-facings.