Abstract
The paper presents the results of studying the regularities of nitrogen removal from steel grade 10HSND under the conditions of oxygen-converter and electric steel-smelting production facilities of Severstal PJSC. Shown are averaged data on smelting, ladle processing and vacuuming of steel. The features of the technology for the production of steel grade 10KhSND in the oxygen-converter shop (BOF) and electric electric arc-furnace shop (EAF shop) are given. The parameters of the technological process of production that have the greatest effect on the nitrogen content in steel are established. For the conditions of steelmaking in BOF, the parameters that have the greatest effect on the nitrogen content and the degree of its removal are: melting duration and scrap consumption for melting; temperature of the metal before processing at the "ladle-furnace" (LF) unit and the time of operation under current; the duration of vacuum treatment and the weight of the melt. For the conditions of steel smelting in the EAF shop, the main parameters are: the time of operation under current and the consumption of cast iron for melting; operating time under current at the LF and argon consumption; deep vacuum duration and specific argon consumption in vacuum treatment.
Based on statistical and regression analyzes of production data, vacuum treatment options were developed to achieve the desired nitrogen content in steel.
Keywords:
Nitrogen, steel vacuuming, vacuum treatment duration, vacuum depth, metal temperature in the ladle, argon consumption.