Impact on the Instability of Carbon Content of IF Steel

In this paper,it aim at Panzhihua Steel RH refining process in the high carbon content and instability in IF steel production.its production process tracking survey shows that the impact of the carbon content of the main factors are RH initial steel [C] and a_[o],vacuum degree,decarburization time,carbon picking-up in molten steel caused by ladle refractory materials and alloys about Carbon Control of RH Refining Process for IF Steel in Panzhihua iron and steel company(PZHISC).If the carbon content is more than 0.045%,the end carbon content increases by initial carbon content.If the lowest vacuum degree is lower and progressing time is longer,the end carbon content is higher.To ensure that the carbon content of Panzhihua Iron and Steel IF steel qualified,initial [C] and a_[o] should be controlled of 0.030%~0.045% and(500-700)×10^-6, strengthen monitoring and maintenance of RH equipments are both needed to maintain adequate deep vacuum time and further reduce the vacuum degree.Also,in order to reduce the carbon picking-up in molten steel during the latter part of RH process,on the premise of ensuring no solid steel on vacuum chamber,the ladle with a carbon-free slag line and low-carbon alloys should be used.