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| New manufacture of high speed steel 90 mm billets by electroslag remelting withdrawing process |
| ZANG Xi-min1，DENG Xin1，JIANG Zhou-hua1， 2，QIU Tian-yu1，LI Chun-xu3 |
（1. School of Materials and Metallurgy， University of Science and Technology Liaoning， Anshan 114051， Liaoning，China
2. School of Materials and Metallurgy， Northeastern University， Shenyang 110819， Liaoning， China
3. Steel Making Plant， Ansteel Co.， Ltd.， Anshan 114021， Liaoning， China） |
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Abstract Carbide segregation at grain boundary is a main reason to reduce high temperature hardness and wear resistance of high speed steel. Electroslag remelting（ESR） technology can effectively improve the distribution and size of carbides in ingot solidification process. The ingot diameter is usually [?]200 mm by traditional ESR，but there are still a large amount of reticulated carbides. The carbide segregation degree can be reduced by further decreasing the size of ingot and increasing the cooling rate. However，it will reduce the production efficiency and increase the cost of production. Therefore，new technology on 90 mm billets by electroslag remelting withdrawing（RESW） with bifilar mode and T-mold was developed. The results indicate that macroscopic organization and the size of grain and carbides of 90 mm billets are better than the [?]200 mm ingot produced by traditional ESR technology. Reticulated carbides in 90 mm billets are easier to be broken into small particles in the sequence forging or rolling process. With same production efficiency，the cost is reduced.
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Received: 09 February 2015
Published: 06 January 2016
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2016, Vol. 51 
