Process analysis and practice of clean IF steel production

Taking the processing route of IF steel production,namely "hot metal injection desulphurization→slag blocking in the tapping stage→RH-TB vacuum refining→ medium and heavy plate continuous casting" in the No.4 Work Shop of the General Steelmaking Plant of Angang as the object of studies the present paper discusses in detail 3 key processing points of converter refining,RH vacuum refining and continuous casting and analyzes total oxygen content in liquid steel,temperature control in RH,protection casting and control of consistency in the continuous casting and puts forward measures for improvement in the cleanliness of IF steel.As the results very satisfactory results have been achieved in the aspects of improvement in the cleanliness of the IF steel,reduction of the inclusions in steel and increase in the qualified product rate.