Effect of Cr₂O₃ on the properties of stainless steel refining slags and desulfurization

¹ State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, P.R. China
e-mail: qianguoyu_yejin@126.com
² Southwest Stainless Steel co., LTD, Sichuan, 106083, P.R. China

Received: 22 April 2016
Accepted: 15 July 2016

Abstract

In order to be able to understand the effect of residual Cr₂O₃ (0–1.5%) on properties of stainless steel refining slag and desulfurization, the melting temperature and apparent viscosity were measured in the temperature range of 1300 °C to 1500 °C. The results showed that the melting temperature, apparent viscosity and activation energy of viscous flow gradually rise w ith the increase of Cr₂O₃ content, and that present a larger increase for the slags with bigger basicity. When the basicity of slag is 1.5, melting temperature increases by 50 °C and apparent viscosity increase by 0.1 Pa.s with the increase of Cr₂O₃ content from 0 to 1.5%. But melting temperature and apparent viscosity rise by 100 °C and 0.2 Pa.s for the slags with basicity 1.7, respectively. The small amounts of Cr₂O₃ in stainless steel refining slag can reduce the liquidity of slag by inducing the precipitate of CaO.Cr₂O₃ with high melting point, which has a negative effect on the desulfurization.