Breakout Problems Study of Continuous Casting Steel

Abstract

The breakout is one of greatest problems in the continuous casting processes. We can return most of their reasons on the bad control of casting process circumstances, including the chemical composition of the metal, pouring speed and temperature, as well as operation processes control. In this research, the breakout heats had been constrained for the period of ten months, for (ST 52) type steel .From the operating data, remarked that most breakout heats was out of the upper limit pouring temperature. Breakout is also appearing to be effect by the chemical composition. Although Manganese percent of the steel was within limits, but it is effect to induce breakout in indirect manner. Increase Silicon content will increase the fluidity of molten steel, leading to increase the ferro-static pressure on solidified shell causing breakout. The increase in Carbon percent has a positive effect in decreasing breakouts. From actual operating effect on breakout, it is found that most breakouts were of first sequence of the heat, which it means that casting preparation was unsuitable. Breakout can be eliminate or avoid by compliance with operation instructions.

Keywords: Continuous casting, Breakout, Heat sequence, mould (mold), strand