supply of special electrodes-2 machinable cast electrode. properties uts : 35-40 kg / mm2, size : 4.00mm x 350mm current range : ( ac 50, dc + / 1 ) . 3 mild steel electrode non machinable cast iron electrode characteristies : newton - ci nm is a medium heavy coated, graphite electrode for non-machinable weld on all types of cost irons weld metal extrenely tough, pre heating is recommended between 300°c to 800°c depending upon the thickness of parent metal, size : 2.5, length 350mm welding current 60-200amps. 4 hard facing machinable electrode, properties hardness 28-33 hrc, size : 4.00mm x 450mm ( ac 50 dc + / - ) . 5 hard facing non machinable electrode, properties hardness 63-65 hrc, size : 4.00mm x 350mm, current range : ( ac 70, dc + / - ) .