Production of the steels of special duty at the "Lasmet" Ltd. for developing reference samples

Abstract

A technology for production of special steels of a given chemical composition for reference samples is considered. The developed technology includes smelting of the steel (alloy) of a given composition in a vacuum induction furnace using high purity charge materials followed by forging of the ingot in several stages on hammers with a mass of the falling part 7 and 3 tons and rolling on a universal mill 250 into finished bars. Alloys of several grades were preliminarily smelted in a laboratory vacuum induction furnace in accordance with the chosen scheme of metal microalloying and then subjected to hot deformation and hot plasticity tests. The hot plasticity was evaluated on a plastometer designed by the Research Institute of Metallurgy (Chelyabinsk). The data obtained during the research made it possible to adjust the technology of smelting (by optimization of the amount of microalloying elements) and hot deformation of metal (by the choice of heating temperature for forging) in conditions of pilot production. This technology was repeatedly used to obtain metal products which formed a base for reference samples of LG32 - 36, LG56 - 64, NG15 -17 series and some others manufactured at the Institute for Certified Reference Materials (Yekaterinburg). The developed technique ensures a high purity of the produced metal in terms of dissolved gases, harmful impurities and non-metallic inclusions, which made it possible to provide the customer with high-quality metal in a short time frame.