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| Causes Analysis of End Cracks and Damaged Top of Steel T8 |
| ZHANG Yan-dong,JIANG Tai-qiong,HE Xiao-lin,HE Wen-cheng,HOU Ping-jie,LI Ming-lin |
| Xining Special Steel Group Co., Xining 810005, Qinghai, China |
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Abstract When cold shearing was applied on steel T8, there were larger proportion end cracks and damaged top on the steel T8 produced by Plant A. While on the steel of Plant B, the percentage is small. Therefore, the same sized steel T8 were chosen from both Plants and investigation was conducted on their chemical compositions, non-metallic inclusions, brinell hardness and metallographic structure. The results showed that the reason of end cracks by cold cutting is due to its high hardness. High carbon content in the steel resulted in high hardness of steel T8 manufactured by Plant A. Besides, the lower final rolling temperature, longer staying over on cooling beds after rolling and lower pile-cooling temperature all contributed to make the problem worse. However, the internal quality of the steel has no effect on it.
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Received: 26 March 2013
Published: 17 April 2014
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2014, Vol. 32 
