The demanding requirements of corrosion resistance in waste incineration environments lead to the need for materials like the new alloy UNS N06045, commonly referred to Alloy 45TM (46Ni 27Cr 23Fe 2.75Si 0.1Ce). This new alloy exhibits excellent corrosion resistance in incineration environments because of its high chromium (27-28%) and silicon (2.5-3.0%) contents as well as the alloying of rare earth elements. An important criterion for the suitability of Alloy 45TM in waste incineration is a low weight loss during operation. Of particular interest is the corrosion behavior in mixed gas environments typically found in incineration systems. The reliability of the incineration equipment will require corrosion resistance from both the base metal and the weldments. This paper provides corrosion data obtained in laboratory tests in various gas compositions at temperatures up to 1100°C. Special emphasis was given to the corrosion behavior shown by different welding consumables like FM28 (UNS N08028) and FM 625 (UNS 06625).
Keywords" Welding, weldments, HAZ, waste incineration, sulphidation, alloy 45 TM UNS N06045, alloy 625 UNS N06625