DAIKO 59K

The weld deposit composition, with a formula of 59% Ni-23% Cr-16% Mo, has been specifically designed to match the specifications of alloy 59. This high molybdenum (Mo) content is similar to that of alloys C276 and C4, but the operating capabilities in a wide range of oxidizing environments are considerably enhanced by increasing the chromium (Cr) percentage to 23% in alloy 59. The overall composition surpasses the level generally found in alloy C22, making it suitable for welds of this group of alloys. Alloy 59 consumables also offer a weld metal free from niobium (Nb), characterized by considerable strength and toughness, ideal for dissimilar welds in superaustenitic and superduplex stainless steels or in combinations of these with nickel-based alloys. Applications of alloy 59 in aggressive corrosive environments include flue gas desulfurization (FGD) scrubbers, digesters and equipment for paper manufacturing, chemical process plants, corrosion-resistant linings, and extreme offshore and petrochemical scenarios. No preheating is necessary; a heat input of less than 1 kJ/mm and a maximum interpass temperature of 100 °C are optimal conditions to minimize the formation of precipitates that could compromise the corrosion resistance and ductility of the weld metal.