“…Characterizing the mechanical characteristics of the alloy HX -Alloy Type 66Ni-17Cr, according to Table 1, it is clear that this material has high values of r B 750 , d, w, which is an assessment of its operational reliability. However, under the action of high temperatures, such mechanical properties [22] as elasticity, yield strength, and strength are significantly reduced. Therefore, even at stress values that are less than the yield strength, the phenomenon of creep can occur, which is manifested in a gradual increase in plastic deformation.…”