Oerlikon Supranox RS 312 description: SUPRANOX RS 312 is a rutile coated MMA electrode for joining difficult-to-weld steels, dissimilar steels and for wear-resistant surfacing and buffer layers, the deposit hardness is 220 HB. Applications include repair and maintenance welding on machines, power transmission equipment and tools. The microstructure of the higher strength weld metal consists of ferritic-austenitic Cr-Ni steel, with 50% delta-ferrite, and is highly crack resistant, rust-proof and non-scaling <1100C. Very good weldability, weld metal transfer is in fine droplets with easy slag removal, producing a good weld bead shape.