Metrode 1NICUB description: Mainly used for weathering steels such as Corten containing a similar controlled copper addition and claimed to offer a three-fold improvement in corrosion resistance and a more stable patina compared with plain CMn steel. Applications include architectural structures, bridges and exhaust gas flues, chimneys. This weld metal also resists preferential corrosion in seawater, particularly in arctic waters high in oxygen and salinity, and has applications for welding micro-alloyed and CMn steels in ice-breaker vessels and off-shore structures.