Practice of Controlling the End-point Oxygen Content of IF Steel in Converter
Oxide inclusion is the primary cause of surface upward and strip defects in the IF rolling process.To minimize oxide inclusions in steel,it is essential to lower the oxygen content at the converter end-point.The converter in Hanbao Steelmaking Plant adopts IF steel with high catch carbon and enlarged tapping hole diameter to reduce tapping temperature and realize low oxygen content tapping.The practice shows that the end carbon content of converter is increased from 0.033％to 0.041％on average after adopting high catch carbon.The tapping time is shortened from 6.5 min to 5.2 min after the tapping hole is enlarged.The tapping temperature decreased from 1 674.6 ℃ to 1 658.3℃,and the end-point oxygen content decreased from 578.5 ppm to 431.5 ppm,Carbon and oxygen product decreased from 0.001 88 to 0.001 74.The quality of IF steel is improved.
IF steelend-point oxygen contentend-point carbon contentend-point temperature
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