Bohler CN 23/12-IG description: GMAW wire of type G 23 12 L / ER309L. This is a standard alloy for welding dissimilar joints with an average ferrite content 16 FN. BÖHLER CN 23/12-IG is designed for very good welding, wetting and feeding characteristics as well as good safety after dilution when welding dissimilar joints. Suitable for service temperatures between -80°C and +300°C.