Sandvik 25.10.4.LB description: Sandvik 25.10.4.LB is a covered electrode with basic coating for welding of super-duplex (austenitic-ferritic) stainless steels like UNS S32750/32760 (e.g. Sandvik SAF 2507 and Zeron 100). It gives a molybdenum alloyed super-duplex weld metal and is designed for excellent positional welding, corrosion resistance and impact properties.