Bohler CN 25/9 PW-FD description: BOHLER CN 25/9 PW-FD is a rutile flux-cored wire designed for welding ferritic-austenitic superduplex steel and equivalent steel grades such as Zeron 100 (UNS S32760, EN 1.4501) and 2507 (UNS S32570, EN 1.4410). BOHLER CN 25/9 PW-FD can also be used for joints between superduplex grades and austenitic stainless steels or carbon steels. Superduplex steels are particularly popular for desalination, pulp and paper, flue gas desulphurization and sea water systems. The properties of the weld metal match those of the parent metal, offering high tensile strength and toughness as well as an excellent resistance to stress corrosion cracking and localized corrosion. The operating temperature range is -40°C to 220°C.