Oerlikon Carbofil KV7M description: CARBOFIL KV7M is a copper coated GCrMo91/ER90S-B9 type solid MAG welding wire supplied precision layer wound, for welding creep resisting steels of the type 9Cr1MoVNbN. Ar-CO2 mix shielding gases preferred for improved mechanical properties. CARBOFIL KV7M is especially designed for the ASTM steels T91/P91. Approved in long-term condition <+650C
service temperature. Improved creep strength is obtained by the addition of nitrogen, niobium and vanadium.