Novikova E. Reduction of scaling on steel ingots heating

Dissertation is devoted to studying the problem of heat and mass exchange process of steel ingots scaling on high-temperature heating and also to studying heat and power saving technology of steel heating with the use of electro physical action (EPA) and working out of practical recommendations for it. In the work a theoretical grounding of scaling speed forming decrease effect on superimposing of constant electric field from negative terminal is given. The fact of scaling speed decrease and therefore decrease of burning loss on use of EPA is determined experimentally.The area of EPA use is established. The main requirements are possibility of electric potential supply in the cold zone and metal electric insulation. Value -30V is proposed as safe working potential under action of which decrease of scale layer at least by 20% occurs and values of scaling constants for medium-carbon steel grades are found. Practical recommendations for technology of high-temperature steel-heating with the use of EPA asfor continuous pusher-type furnace are worked out. Found scaling constants are used in (thermo physical) mathematical model in which movement of bounds "metal-scale" and "scale-medium" is taken into account. This model allows to study dynamics of scaling on steel ingots high-temperature heating with EPA use.