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
2 Southwest Stainless Steel co., LTD, Sichuan, 106083, P.R. China
Accepted: 15 July 2016
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.
Key words: Stainless steel / refining slag / Cr2O3 / apparent viscosity / melting temperature
© EDP Sciences, 2016