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Synopsis: Addition of nickel up to 3% and cobalt to 2% have been made to lowC-10Cr-2Mo-0.1V-0.05Nb steel and the effects on mechanical and high temperature-properties were examined. Microstructures were also investigated by transmission electron microscopy. Results obtained are as follows; (1) Increasing the nickel content up to 1% improves both creep rupture properties and tempering resistance but high nickel addition has a deleterious effect on them. (2) The low nickel steels exhibit the maximum tempering resistance when they are normalized at 1 100•Ž, but high nickel steels have almost the same long time tempering resistance though they are normalized at various temperatures. (3) Cobalt addition has no significant effects on creep rupture properties and tempering resistance. (4) Increasing the nickel content gives rise to a significant increase in the ultimate tensile strength but progressive decrease in ductility. (5) Their creep properties are clearly related to Ac1 temperature. According to the micrographic examination, the coagulation of the carbide is retarded but recovery of matrix is accelerated in the temperature range from 550•Ž to Ac1.

The Effects of Ni and Co on Microstructures and High Temperature Properties of 10Cr-2Mo Heat Resisting Steels