Abstract
We consider the influence of complex microalloying on the mechanical properties, wear resistance, and contact fatigue of steels used for rock roller drill bits. We established that the complex microalloying of new steels with niobium, titanium, and rare-earth metals increased the mechanical characteristics and abrasive wear resistance by 20% and the contact fatigue by 75%. The optimum ratio of carbide-stabilizing elements, namely, niobium and titanium, in the steel, which is additionally microalloyed with rare-earth metals, is determined. As an alternative to high-nickel steels, we developed new low-alloyed 20KhGN2MBTA and 20KhGNBTChA steels.
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