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| Development of a new technology for manufacture of hollow ingots by electroslag remelting process |
| JIANG Zhou-hua1，LIU Fu-bin1，YU Qiang2，CHEN Xu1，ZANG Xi-min3，DENG Xin4 |
（1. School of Materials and Metallurgy，Northeastern University，Shenyang 110819，Liaoning，China
2. School of Information Engineering，Northeastern University，Shenyang 110819，Liaoning，China
3. School of Materials and Metallurgy，University of Science and Technology Liaoning，Anshan 114051，Liaoning，China
4. School of Electronics?and?Information?Engineering，University of Science and Technology Liaoning，Anshan 114051，Liaoning，China） |
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Abstract The different methods for manufacture of large cylinders and hollow ingots have been reviewed. The shortcoming of the traditional electroslag remelting （ESR） process for manufacture of hollow ingot has been analyzed. A new electroslag remelting technology for hollow ingot manufacture was recently commercialized due to the cooperation between Northeastern University of China and Elmet-Roll engineering company （Ukraine）. The usage of T-shape current supplying mould （CSM） and ingot withdrawing system as well as the change of consumable multi electrode （electrodes） are the main features of performed process. Using the new process the different ESR hollow ingots with steel grades of 35CrMo，P91，TP347 and Mn18Cr18N and dimensions of[?]900/[?]500 mm，[?]900/[?]200 mm，[?]650/[?]450 mm，maximum length of 6 000 mm were successfully manufactured. The industrial tests show that the ESR hollow ingots with perfect quality of surfaces and defect-free macrostructure have been obtained，which should be good materials for manufacture of high quality large pipes and cylinders.
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Received: 15 December 2014
Published: 12 October 2015
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2015, Vol. 50 
