MECHANICAL PROPERTIES OF STEEL GRADE 7ХНМФБ FOR MANUFACTURING WOOD CUTTING SAWS

Abstract

The article covers issues related to research into the mechanical properties of tool steels used for the manufacture of wood-cutting saws (frame, band and circular saws). Specialists of the institute, in cooperation with the Ukrainian Research Institute "Spetsstal" (Zaporizhia), developed a new domestic alloyed tool steel of the brand 7ХНМФБ, which has a number of advantages over the well-known steels of the brand 9ХФ and 9ХФМ: increased heat resistance, corrosion resistance, acid resistance, wear resistance and creep resistance. The impact toughness of steels, temporary resistance to rupture and fracture toughness were also determined. In the course of research, it was established that the new 7ХНМФБ steel grade is superior to known steels in all parameters. This applies to such important indicators as strength limit, yield limit, relative elongation and relative contraction, impact toughness and fracture toughness. Such indicators became possible thanks to the chemical composition of the new steel and the technology of its smelting. These researches make it possible to predict that wood-cutting saws, which will be made from a new brand of steel, will outperform saws made from known steels in terms of their operational properties.