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| Stamping Cracking Mechanism of High Strength Beam Steel of 750MPa Level |
| YU Yang1,MENG Xian-tang1,WANG Lin1,WANG Chang1,LI Fei1,LI Rui-heng2 |
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 The stamping cracking defect is the main problem for the utility of high strength beam steel with the strength exceeding 700MPa. Controlling the inclusions and center segregation and grinding the shear plane can reduce the probability of stamping cracking. The paper was mainly focused on hot rolling process to investigate the cause and mechanism leading to stamping cracking. The microstructure, mechanical properties, heating and rough rolling temperature system, finishing rolling and coiling temperature system, finishing rolling speed, as well as the influence of hot charging system, were all comparatively analyzed, considering the difference between the normal strip and stamping cracking strip of 750 MPa level beam steel. And some beneficial experiences were provided for production of this kind of steel. The results show that ensuring fine rolling speed is the important way to low the probability of stamping cracking defect.
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Received: 06 May 2013
Published: 28 April 2014
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2014, Vol. 49 
