REFINEMENT OF THERMOKINETIC DIAGRAMS DECOMPOSITION OF AUSTENITE STEEL GRADES 70–80

Abstract

In 2019, the air cooling line of Mill 170 of MMK PJSC was upgraded. It was aimed at obtaining sorbitized wire rod directly at the mill. The use of such products makes it possible to eliminate one intermediate heat treatment operation in the wire production process, as well as to increase the stability of the mechanical properties of the finished wire produced from such a wire rod. As part of scientific research on the devel-opment of wire rod production technology on the air cooling line, studies were conducted to determine and refine the cooling curves of steel grades 70–80. The use of the obtained curves made it pos-sible to propose a mathematical model of rolling and cooling modes, the adequacy of which was proven in practice, and the modes themselves were included in the technological instructions for the mill.