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| Research on the Factors Inducing Strip Fracture of High Strength IF Steel Containing Phosphorus During Straightening Process |
| WANG Chang1，YU Yang1，WANG Lin1，CHEN Jin2，XU Hai-wei1 |
1. Shougang Research Institute of Technology, Sheet Metal Research Institute, Beijing 100043, China
2. Shougang Qian’an Steel Company, Technology and Quality Division, Qian’an 064404, Hebei， China |
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Abstract Based on the morphology observation of fracture and precipitate of high strength IF steel containing phosphorus with SEM and TEM, the segregation of coarse dendritic Fe(Nb,Ti)P at the grain boundaries was concluded as the mainly reason inducing the strip fracture during straightening process. Through the precipitate dissolving experiments upon the fracture strip and the thermal simulation experiments simulating different laminar cooling speed, the precipitation temperature range and factors causing Fe(Nb,Ti)P segregation at the grain boundaries was revealed. On the basis of the theoretical research, several effective methods are proposed to reduce the occurrence of strip fracture including the optimization of rolling temperature, cooling speed of laminar cooling, composition design, and coiling temperature etc, which has succeeded in restraining the strip fracture during straightening process.
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Received: 24 October 2013
Published: 07 May 2014
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2014, Vol. 49 
