Abstract
The development of low-temperature, high-strength weldable steels for very heavy-duty mine vehicles and pit props is considered. Steels of strength classes S70/60 (σy ≥ 590 N/mm2) and S80/70 (σy ≥ 690 N/mm2) are based on alloying with Cr, Mn, and Si, without added Ni and Mo; wear-resistant steels of strength class S100 (σy ≥ 950 N/mm2) are based on alloying with Cr, Mn, and B, with a small content of Ni and Mo. The bainitic–martensitic or martensitic structure with small lath size obtained after quenching and tempering ensures strength, plasticity, and low-temperature strength of the steels. Microalloying reduces the austenite grain size in recrystallizing rolling (microalloying with V) and in heating of the steel before quenching (microalloying with V and Nb) and also ensures precipitation hardening on account of the precipitation of vanadium- and niobium-carbonitride nanoparticles. The new steels may be used to replace imports of high-strength weldable steels of the same strength classes.
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Original Russian Text © V.N. Nikitin, S.Yu. Nastich, L.A. Smirnov, A.B. Mal’tsev, S.V. Denisov, O.N. Chevskaya, A.M. Brylin, V.S. Kurash, V.M. Maslyuk, V.M. Tarasov, 2016, published in Stal’, 2016, No. 10, pp. 57–66.
From the works awarded the prize of the Russian Federation Goverment in the field of science and technology in 2015.
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Nikitin, V.N., Nastich, S.Y., Smirnov, L.A. et al. Economically alloyed high-strength steel for use in mine equipment. Steel Transl. 46, 742–751 (2016). https://doi.org/10.3103/S0967091216100089
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DOI: https://doi.org/10.3103/S0967091216100089