Oerlikon Ferinox 307 description: FERINOX 307 is a rutile coated high-efficiency MMA electrode, 160% recovery, for surfacing and joining ferritic to austenitic steels, dissimilar joining and difficult-to-weld steels. Also suitable for buffer layers when hardfacing. Stainless, fully austenitic chromium-nickel-manganese weld metal, small amounts of delta-ferrite are possible. The weld metal is highly crack-resistant and non-scaling <850C. The hardness of the all-weld metal is 180 HB, which work hardens to 450 HB under impact load. Highest operating temperature for dissimilar steel joints is 300C. In case of higher temperatures, use SUPRANEL 600 electrodes.