1988 Volume 74 Issue 7 Pages 1306-1313
The prereduction shearing method of continuous casting steel has been fundamentally investigated in which reduction of thickness and sequential shearing are applied to the steel for the purpose of decreasing the capacity of a shearing press as well as saving energy.
The prereduction shearing model tests of hot carbon steel were carried out, and a prereduction shearing apparatus was made according to the results.
The prereducing tests of unsolidified ingots were also carried out to show that no internal cracks are found when the ratio of solid shell thickness to total thickness is more than about 30%. In the prereduction shearing tests of unsolidified ingots, a few internal defects appeared, but they were very fine and thought to be harmless. Some cracks and leaks of liquid steel through the cut section were observed too, and they caused to the surface defects at the end of rolled sheets. However, they were not so serious because they would be cut off with crop loss.
The press capacity is minimum when a prereducing load equals to a shearing load, and for a large section continuous casting steel it will be remarkably reduced by angular tools after solidification, and by circular tools before solidification.
It is concluded that the prereduction shearing method is very useful for promoting hot direct rolling process of continuous casting steel.
