In view of the causes of cracking on the surface and edges of high temperature ring blank in the mold ring blank casting-rolling continuous forming

the mechanical properties of 42 CrMo ring blank by vertical centrifugal casting were investigated at high temperature under different cooling rates and holding time by Geeble-3500 thermal test simulator. The results indicate that the cooling rate and holding time have less influence on the strength of the material

yet more on the plasticity. The plasticity of the material is increased with slowly cooling below 1 000 ℃

while decreased greatly at 1 200 ℃. Rapid cooling has the contrary law that plastic is increased significantly at 1 200 ℃.