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| Cause Analysis and Mechanism Discussion?of Coil Oval Deformation During the Production of Strapping Steel |
| WANG Chang1, YU Yang1, WANG Lin1, CHEN Jin2, CHEN Bin1, HUI Ya-jun1 |
1. Shougang Research Institute of Technology,Beijing 100043,China
2. Shougang Qian��an Iron and Steel Co., Ltd.,Qian��an 064404,Hebei,China |
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Abstract The hot rolling coil oval deformation defect of steel strapping 72AU2 was frequently produced in the actual production, which influenced the normal production of downstream. The mechanism of the strapping steel 72AU2 coil oval deformation was discussed by thermal expansion simulation experiments for the phase transformation process of strapping steel coil oval deformation. The results show that bainitic transformation was induced because of the low phase transformation temperature after the low temperature coiling process, resulting in larger thermal expansion amount of the coil outer ring which could not be compensated by the air cooling effect in nature environment , causing the coil layers to become loosened ?and then coil oval deformation was produced under the effect of self-weigh. Basing on the mechanism research, several suggestions were given for inhibitsing coil oval deformation, such as improving coiling temperature to 650 ��, extending the residence time on reel, controling coil phase transformation in the high temperature, formation of ferrite and pearlite to reduce expansion, expanding temperature difference of steel coil outer ring and environment to enhance cooling effect.
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Received: 15 November 2013
Published: 12 December 2014
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2014, Vol. 32 
