THE ASSESSMENT OF THE STRUCTURE AND PROPERTIES OF HIGH-CARBON STEEL WIRES AFTER THE PROCESS OF PATENTING WITH INDUCTION HEATING

摘要

One of the most important types of heat treatment that high-carbon steel wires are subjected to is the patenting treatment. This process is conducted with the aim of obtaining a fine-grained uniform pearlitic structure which will be susceptible to plastic deformation in drawing processes. Patenting involves two-stage heat treatment that includes heating the wire up to the temperature above Ac-3 in a continuous heating furnace (in the temperature range of 850 divided by 1050 degrees C) followed by a rapid cooling in a tank with a lead bath down to the temperature range of 450 divided by 550 degrees C. The patenting process is most significantly influenced by the chemistry of the steel being treated, as well as by the temperature and the rate of heating and cooling of the wire rod or wire being patented.