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Vol.43, No.3, 188 ~ 195, 2005
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| Title |
| Effects of Strain Rate and Remelting on Hot Ductility of Continuous Casting Slab |
| 변재환 Jae Hwan Byun , 손광석 Kwang Suk Son , 서상철 Sang Chul Seo , 김진수 Jin Soo Kim , 이주동 Joo Dong Lee , 임창희 Chang Hee Yim , 김인수 In Soo Kim , 이성근 Sung Keun Lee , 김동규 Dong Gyu Kim |
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| Abstract |
| The effect of strain rate and remelting on hot ductility of low carbon steel were investigated. The specimen was prepared from as cast continuous casting slab, and also the slab was remelted to assess the effect of remelting by which cast structure would be modified. High temperature tensile test was adopted to get the hot ductility data. In case of 0.18 wt.% carbon steel, hot ductility was markedly improved with increasing strain rate in both specimen obtained from as cast slab and remelted slab. Comparing the results obtained from as cast specimen and remelted specimen, it showed similar value of hot ductility in low temperature range, and in high temperature region, showed higher R/A(reduction of area) value in the specimen obtained from remelted slab. The decreased RA value of as cast specimen in high temperature region could be explained by the increase in initial grain size due to slow cooling of large slab during continuous casting. It means that we should presume lower value of hot ductility than the value obtained from remelted specimen in case of lab data application to actual continuous casting process. (Received November 22, 2004) |
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| Key Words |
| Hot ductility, Continuous casting, Strain rate, Remelting, Cast structure, R/A |
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