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Elevated temperature intergranular cracking in heat-resistant alloys has been generally explained in the light of the formation and coalescence of voids in the soft denuded zone which is caused by grain boundary precipitates.1,2) However, the mechanism for the formation of closed voids at grain boundaries normal to the tensile stress and their development to the intergranular cracking are not still clear. It has been proposed that the intergranular cracking in metals is their intrinsic property occurring at elevated temperatures3) due to the intergranular fracture strength lower than the yield strength (exactly speaking, the flow stress), and the segregation of impurities (P and S) to the grain boundaries accelerates the intergranular cracking by lowering the grain boundary cohesion strength.3–10) The bulk content of impurities (especially, sulfur) has been, therefore, reduced to below 10 ppm to minimize the possibility for the intergranular cracking in heat-resistant alloys. Such an elevated temperature intergranular cracking has frequently occurred during service exposure in welding parts of heat-resistant martensitic or TP347H austenitic stainless steel tubes in fossil power plants of Korea. Figure 1 shows such a typical premature cracking in the heat-resistant TP347H austenitic stainless steel tube which occurs within the coarse-grained Dependence of Elevated Temperature Intergranular Cracking on Grain Size and Bulk Sulfur Content in TP347H Austenitic Stainless Steels