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| Practical study on control of corner crack breakout of Malaysia stander C12D steel billet |
| CHEN Rong-kai，LIU Kun |
| （Alliance Steel （M） Sdn. Bhd.， peheng 26150， Malaysia） |
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Abstract The standard C12D steel in Malaysia belongs to the peritectic steel. The 7 machine and 7 flow 8 m arc square billet caster is used to produce the continuous casting billet of C12D steel （165 mm×165 mm） in United Steel. The main problem in the production is the longitudinal crack in the inner arc， which directly causes the leakage of steel and affects the smooth production of the normal production. In order to solve the problem of longitudinal cracks in continuous casting billets， the mechanism of crack morphology， microstructure and crack formation in continuous casting C12D steel was studied. By adjusting the composition of molten steel， the overheat of molten steel， the selection of the slag， the adjustment of the cooling water and the speed of drawing， the goals of controlling the longitudinal crack in the corner of the casting billet and stabilizing the production are achieved.
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Received: 30 July 2018
Published: 29 January 2019
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2018, Vol. 37 
