RATIONAL LENGTH OF SUPPORTED SYSTEM OF NARROW FACES OF CONCAST BILLET FOR PREVENTING ITS CONVEXITY

Urgent task for JSC “Ural Steel” is to determine the length of a rational supporting system on the frame of the mold to prevent the formation of bulges narrow edges of slabs with cross-sectional dimensions of 270Ч1200 mm. The technique is based on a comparison of the strength of the hardened crust narrow workpiece edge at different points in the length of the cast slab and the calculated value Expander pressure of liquid metal on the crust is used to solve this problem. Peel strength of the hardened slab in the possibility of plastic deformation of the shell may have yield strength of conventional cast steel. Experimental determination of the yield strength of cast steel grades 09G2S and 15HSND was conducted on high-temperature setting «Zwick  /  Roell Z1600H» in the temperature range 900–1400 °C. The value Expander pressure of liquid metal acting on the hardened crust slab was designed by the developed technique, which allows to take into account the specifi c conditions for the considered caster. Comparing the experimental and calculated values of the parameters established that the hardened crust of the narrow side of the slab thickness of 270 mm starts to withstand bursting pressure melt away from the metal mirror is equal to 1610  mm. With regard to the height of the metal mold (800 mm) length of the narrow sides of the support preform should be 810  mm. This can be possible if the number of support rollers with a diameter of 130 mm for each side of the workpiece is increased from four to fi ve. The studies identifi ed a rational extension of the supporting system located on the frame of the mold to prevent the formation of bulges narrow faces of slab blanks with cross-sectional dimensions of 270Ч1200 mm in terms of “Ural Steel”.

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