G-TECH 253MA

Designed to match with equivalent alloys, this material offers excellent heat resistance and significant oxidation stability up to approximately 1100 °C. Its resistance to sulfidation under oxidizing conditions is superior compared to many other heat-resistant alloys with a higher nickel content. Resistance to nitriding and carburizing is also satisfactory, except in reducing conditions, where alloys with higher nickel content are more performant. The product is also satisfactory for welding dissimilar material combinations with related alloy levels. However, controlling hot cracking in welding metals with high silicon content depends on the presence of ferrite during solidification. Therefore, it is crucial to pay attention when evaluating dilution with dissimilar materials that might promote fully austenitic solidification, as in the case of 310-type alloys and other high-nickel content alloys. Combinations with titanium-stabilized and especially niobium-stabilized alloys should be avoided due to the risk of embrittlement from the formation of silicon-rich eutectics. Main applications include furnaces and related components, high-temperature chimney flues, exhaust and heat recovery systems, as well as combustion nozzles. No preheating is required; it is recommended to maintain the interpass temperature below 150 °C.