Abstract
The influence of microadditives of vanadium and nitrogen on the complex properties of medium-carbon highstrength nickel-cobalt steel after heat treatment in different modes is studied. It has been established that alloying of 30Н9К4 steel with vanadium and vanadium together with nitrogen after quenching and high tempering provides high strength and toughness of the steel. Modification of 30Н9К4 steel with a carbonitride phase after quenching and high tempering significantly increases its ductile properties while maintaining high strength. Keywords: medium carbon steel, heat treatment, hardening, tempering, nitrides, carbonitrides, strength, toughness, fatigue, brittleness, brittleness ability, cold brittleness threshold, hardenability.rafiq_46@mail.ru, musurzayeva71@mail.ru, velif@mail.ru
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