A method of making austenite during hot forging of a non-tempered steel

摘要

An object of the present invention is to provide a method of refining austenite during hot forging of a non-tempered steel capable of suppressing coarsening of austenite and suppressing a decrease in impact toughness. The austenite refining method for non-tempering steels is to perform the multi-step plastic deformation within the temperature range where hot forging can be performed during the hot forging of non-tempered steel, while cooling the forging to a temperature as low as possible,