Hang Eaf Slab Surface Quality Problems

In recent years, the surface quality of continuous casting more and more attention with the application and development of continuous casting technology,.At present, the slab surface cracks, pits and surface of the slab of oscillation marks as the most common quality defects, has become the bottleneck restricting the application of advanced technology. Electric furnace steel company as an example of Hangzhou in 2009, the production process in the continuous casting slab surface often a number of cracks, vibration marks, scratches, pits, surface slag, air bubbles and holes, re-skin and other defects. According to the statistics of these surface defects, including cracks in the surface of defects likely account for about 50%, vibration marks with the pits about 35%, and for this I think of the formation mechanism and control technology is of great significance. In order to solve the difficult problems as quickly as possible, Hangzhou Iron and Steel Group Corporation decided: with their actual production process conditions, the surface of the furnace steel billet case of large defects (cracks, vibration marks and pits, etc.) to tackle technical problems.The topics to hang EAF billet surface quality targeted research, through the establishment of continuous casting billet heat transfer model simulated the distribution of continuous casting billet temperature to analyze the resulting slab surface cracks, dents, defects such as the main reason of oscillation marks , electric furnace steel with Hang the actual conditions of production companies currently using the vibration parameters of the cooling methods to optimize and improve the surface quality of billet. According to the simulation results, the Hangzhou Iron and Steel billet casting furnace 200mm 260Si2MnA example, depression and oscillation mark to resolve defects in bloom the following measures: control of smelting in the carbon content 0.08% or less, superheat stable at 25℃, casting pull rate steady at 1.6m/min around with water cooling with moderate intensity, high vibration frequency, small amplitude, curve 4 vibration mode, you can get a better slab surface quality.