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| Cause Analysis and Improvment for Internal Crack of Medium and Low Carbon Steel Continuous Cast Billet |
| ZHANG Xia,WANG Zhao-yang |
| Technical Center, Tianjin Iron and Steel Group Co., Ltd., Tianjin 300301, China |
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Abstract The factors leading to occurrence of billet internal crack are analyzed on the medium and low carbon steel data from Tianjin Iron and Steel Group Co., Ltd.The effects of liquid steel composition, the superheat and the drawing speed on internal crack are discussed in detail. The results show that the internal crack can be decreased by controlling the upper limit of the carbon, reducing the sulphur and controlling the w(Mn)/w(S) in more than 30.The formation probability of internal crack can be lessened by the lower superheat. The internal crack rate is the lowest when the drawing speed is controlled steadily in the upper limit. The internal crack rate is lessened from 21.26% to 3.40% after taking various measures.
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Received: 12 March 2013
Published: 16 September 2013
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2013, Vol. 1 
