Electrical Steel Deformation Resistance Of The Research And Application

It was burgeon stage for the metals research on the plastic deformation resistance of metals before 1940. With the limitation of production level and test apparatuses the research was mainly focus on the relationship between the tensile limits and deformation temperatures at different deformation temperatures for various steels. Since the computer was applied to control rolling production on line, the mechanical models of plastic deformation, also called mathematical models of rolling force, had become one of its key parts. It was imperative to obtain the data of deformation resistance and mathematical model for rolling force. Electric steels, also called silicon steels, which contain very low carbon content and silicon lower than 6.5%, are metallic functional materials used to make transformer and iron core of electric motor. The electric steels include oriented steels or non-oriented steels. The research of electric steels in China was later than abroad; the researches on the deformation resistance are rather fewer. The research of electric steels in Pan Steel was much later, and the first piece of steels was produced in 2005.Three experimental electric steels produced in laboratory(the first with 0.50% Si, the second with 1.50%Si and the last with 3.0%Si) were used to study the effect of chemical compositions, deformation temperatures, deformation rates and deformation degrees on the deformation resistance by means of Gleeble-3500 heat simulative testing machine. It has been found that the curves of deformation resistance vary with chemical compositions of tested steels. The electric steel with silicon content less than 1% shows a critical zone between 850℃to 900℃in which the volume fraction of ferrite increases and the deformation resistance decreases as deformation temperature decreases. The deformational temperature is the most effective factor to affect the deformation resistance. The higher the deformation temperature, the higher the deformation resistance, but the experimental result shows an inverse relationship in the critical zone. When the deformation temperature is above 900℃, the two electric steels with silicon content above 1% show similar deformational resistance, but the(?)ested electric steel with silicon content less than 1% shows a higher deformational resistance than the others two tested steels. In addition, the deformation resistance increases as deformation rates increases, but deformation rates had a little effect on deformation resistance at higher deformation rates. The deformation degree is also an important factor effecting deformation resistance. The deformation resistance tends to increase as deformation degree increases. However, for the two tested electric steels with silicon content above 1%, the deformation degree seems to have a little effect on deformation resistance when it is over 0.10.Justified regression formula was used to obtain the corresponding regression coefficients and curves. It had been found that the computing results were well corresponded with actual values. The rolling model was modified according to the regression result and a hot-rolling experiment of lower silicon content electric steel was conducted. The results showed the computing loads close to actual rolling loads and were also below the rated value of rolling mill. It was indicated that the three kinds of electric steels could be produced on 1450mm hot-rolling mill train in Pangang steel.