Effect of Temperature-Deformation Treatment Regime for Special Alloy Steels on Rolled Product Structural State and Properties

The effect of cooling regime after rolling and also subsequent spheroidizing annealing are studied for rolled product of special alloy steel 40Kh of an industrial melt on metal structural state and amount of relative reduction of area. It is established that the amount of reduction of area, varying uniformly round rolled product capacity for cold upsetting, increases with a reduction in the proportion of ferrite and an increase in steel ferrite-pearlite structure uniformity and fineness. The most favorable microstructure and high value for reduction of area occur after spheroidizing annealing of rolled product with a bainitic structure.