Bohler CN 22/9 N-UP description: Sub-arc wire/flux combination for welding the Duplex stainless steels 1.4462 / S31803. Smooth beads, easy slag removal without any slag residues and good welding characteristics even for fillet welds are very much appreciated by users. Suitable for service temperatures from -40°C to +250°C. The pitting index PREN is >35. BOHLER BB 202 is a fluoride-basic agglomerated flux. For CVN requirements lower than -40°C we recommend our flux BOHLER BB 203. For information regarding the sub-arc welding fluxes BOHLER BB 202 and BB 203 see our detailed data sheets.