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| Tendency of Lamination Defect of Thick-Walled P92 Pipe With Large Diameter Elongated by 2-Roll Rotary Rolling Process |
| YIN Yuan-de1,2,LI Sheng-zhi2,KANG Yong-lin1,WANG Peng-zhan3,WANG Xiang-dong3,LI Guo-tao3 |
1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
2. School of Materials Science and Engineering, Anhui University of Technology, Ma’anshan 243002, Anhui, China
3. Technology Cente, Yangzhou Chengde Steel Pipe Co., Ltd., Yangzhou 225200, Jiangsu, China |
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Abstract To investigate the influence of different technological parameters such as roll rotational speed, feed angle and roll entrance cone angle on tendency of lamination defect of seamless P92 steel pipe thick-walled with large diameter elongated by 2-Roll rotary rolling process, with the aid of commercial FE code MSC.SuperForm, 3D thermo-mechanical simulations were presented. The damage field of the rolling piece during the elongating process, and the tendency of lamination defect of steel pipes were analyzed using Oyane ductile fracture criterion. It is found from the simulation that a high dangerous crack band exists in the internal surface layer of the rolling piece, adjacent to the contact zone with the plug. Furthermore the influence of roll rotational speed, feed angle and roll entrance cone angle on the damage filed were investigated. The result shows that the maximum characteristic value of ductile fracture of rolling piece decreases with the decrease of roll rotational speed, the increase of feed angle and roll entrance cone angle, and the tendency of lamination defect reduces. The scientific basis can be provided for revealing formation mechanisms of lamination defects of rolled seamless steel tubes with high Cr, determining the sensitive working conditions caused defects, and making the effective measures to prevent or reduce lamination defects.
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Received: 13 February 2012
Published: 30 October 2012
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2012, Vol. 47 
