Process of hot forging at ultrahigh temperature.

摘要

A process of hot forging a steel at an ultrahigh temperature, comprising the steps of: heating a steel containing less than 1 wt% carbon in an atmosphere substantially composed of a non-oxidizing gas at a high heating rate sufficient for suppressing the oxidation of the steel caused by a residual oxidizing impurity gas in the atmosphere to a temperature either within or slightly below a range in which the steel has a solid-liquid dual phase structure; and forging the heated steel in a hot forging die at a high working speed in accordance with a preheating temperature of the die so that the steel is maintained at a temperature necessary for imparting the steel with a formability necessary for effecting the forging until a desired form is attained. <IMAGE>