I want factors that play role in end splitting (alligatoring, split ends) and center burst of billet (billet rolled to 8 dia. bars) during continuous rolling mill.
Dear Chaitanya Mahajan, since end splitting (alligatoring, split ends) and center burst of Billets during continuous rolling is caused on the on hand by the special stress / strain conditions at the Ends of the Billets during this process, it is effected by the main process Parameter of hot-rolling, mainly e.g. the strain and therelated properties. The larger the strain applied the larger the effect at the Ends. At the front end the material is pulled in by friction related shear load. The material will deform more intensively in rolling direction until the rollers have full grip and the stress field is fully built up. At the end it is the opposite around. Approaching the end the rolling stresses will decrease as the material can deform more easily towards the free surfaces which are the free vertical edges, but not the Center regions of the cross section of the Billet or squared bar upon which a large strain and hence stress Gradient may occur. A second factor related to strain properties of the material is of course temperature. Here the temperature Profile, meaning uneven distributions of material temperature Play a role. It might be necessary to apply heating (inductive or else) to Keep temperatures over the cross section more homogenuous and within a range of good formability. You may face also seggregation Problems or prblems related to sulfer Content. The formability of low carbon steel is usually high respectively good, but it can be a Problem of material Quality, i.e. from where you got your steel. When hot-rolling Al-Si we had to Keep the temperature in a very narrow range and high enough to avoid horizontal Center Splitting, but it worked after Controlling the temperature properly.
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