HIGH-TEMPERATURE FAILURES OF HEAT-RESISTA NT CAST STEEL

Heat resistant cast steel can fail by high temperature, the atmosphere : deposits and mechanical stresses. High temperature corrosion by gas atmospheres can be oxidation, nitriding, carburization, metal dusting, sulphur and chlorine attack. Corrosion by deposits as oil ash or chro mates and liquid metals as copper base alloys, lead, tin and zinc lead s to a rapid reduction in wall thickness. Besides there are mechanical stresses which lead to failures by stress rupture cracks or thermosho ck. The additional effect by material aging should be considered as we ll.