G-TECH 253MA

Crafted to align with equivalent alloys, this welding material provides robust hot strength coupled with outstanding oxidation resistance up to around 1100°C. Its resistance to sulfidation under oxidizing conditions surpasses many higher nickel heat-resistant alloys. While demonstrating satisfactory resistance to nitriding and carburization, it falls short under reducing conditions where higher nickel alloys excel. Furthermore, it proves suitable for dissimilar combinations of materials with similar alloying levels. Yet, the management of hot cracking in this high-silicon weld metal relies on the presence of some ferrite during solidification. Thus, caution is warranted when contemplating dilution by dissimilar materials that might encourage fully austenitic solidification, as observed in type 310 and other high nickel alloys. Avoiding combinations with alloys stabilized with Ti and especially Nb is recommended to avert potential embrittlement by Si-rich eutectics with these elements. Applications encompass furnaces, furnace parts, high-temperature flues, exhaust and heat recuperator systems, and combustion nozzles. No preheating is necessary and maintaining an interpass temperature below 150°C is advisable.