Description

Screws for the automobile industry were manufactured from wires of steel 23 MnB4 with carbon content 0.1-0.15 percent. In many cases, these screws exhibited surface defects (pitting). A boron-modified steel grade has been proposed to eliminate surface defects and improve wire plasticity. In this work, a physical model of steel wiredrawing has been developed based on plastometer dynamic tests of wires with 12.5 and 11 mm diameter and strain rates in the 1-63 s-1 range. The model was verified by using bench-scale wiredrawing. This work showed that the addition of boron increased yield stress of the steel and a degree of deformation.