PROCESS OPTIMIZATION OF RH DECARBONIZATION OF ULTRA-LOW CARBON STEEL
Aiming at the long RH refining cycle in the process of producing IF steel,the effect of forced decarburization oxygen blowing time and decarburization terminal time on smelting time was studied.The results show that the oxygen blowing time is advanced to the intense stage of carbon oxygen reaction,the starting time of oxygen blowing is advanced from 260 s to 180 s in vacuum cycle,decarbonization time will be increased from 943 s to 860 s,the decarbonization rate is increased and the decarbonization time is shortened.At the end point of decarbonization,the content of CO+CO2 is between 0.8％～2.0％.There is an obvious linear relationship between CO+CO2 content in RH refining waste gas and carbon content in molten steel.The carbon content decreased with the decrease of CO+CO2 content.Under the internal control condition that the end carbon content is less than 15 ppm,when CO+CO2 content increased from 0.8％～0.9％to 1.35％～1.40％,decarbonization period decreased from 860 s to 803 s.By optimizing the timing of forced decarburization and the timing of the end point of decarburization,RH decarbonization time will be increased from 943 s to 803 s,shorten about 140 s.After programming and porting,the developed intelligent model of decarbonization time is combined with the laser exhaust gas analyzer carried by the RH furnace itself,which effectively alleviated the excess of RH decarbonization,improved the efficiency of decarbonization,and laid the foundation for the realization of automatic control decarbonization.
ultra-low carbon steelblow oxygendecarbonizationCO+CO2refining period
万方数据
维普
