JIA Liu-bing1, JI Chen-xi1, DONG Wen-liang1, LUO Yan-zhao1, XU Hai-wei1, DENG Xiao-xuan2
1. Technology Center, Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063200, Hebei, China; 2. Strip Technology Department, Shougang Research Institute of Technology, Beijing 100043, China
Abstract：In order to reduce manganese element deviation in molten steel RH during vacuum smelting process and improve the property stability of the final product. The research results of manganese loss of killed steel and unkilled steel in RH vacuum smelting under different onditions by OES(Optical Emission Spectrometer)shows that there are four forms of manganese loss in RH vacuum smelting process. Chemical reaction between manganese and free oxygen in steel, interface reaction between steel and slag, alloy powder loss, manganese volatilization in vacuum. Manganese loss in RH process gradually increase with the manganese content in steel, vacuum time, the molten steel temperature and oxidation property of steel. When the vacuum degree is less than 1 000 Pa, the manganese loss decreases with the reduce of vacuum degree, whereas when the vacuum degree is greater than 1 000 Pa, the loss of RH vacuum manganese almost unchanged with the decrease of vacuum degree. Through the measures of reducing RH vacuum degree, raising manganese content and temperature,shortening vacuum time, the qualification rate of mass fraction of manganese in the range of target value ±0.01% is close to 100%.
Fujii Y,Nakai Y, Uchida Y,et al. Fundamental investigation of high temperature reduction and melting behavior of manganese ore[J]. ISIJ International, 2017,57(4): 609.
2021, Vol. 31 
