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| Formation mechanism and control measures of?corner transverse cracks in continuous casting slab |
| WANG Hong-feng |
| Shanghai Meishan Iron and Steel Co., Ltd., Nanjing 210039, Jiangsu, China |
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Abstract Slab corner transverse cracks are intergranular cracking at the Ⅲ brittle zone in steel. In the Ⅲ brittle zone temperature range, the precipitation of ferrite films in austenite grain boundaries weakens the grain boundaries, or due to the precipitation of carbon-nitrides, no precipitation area (grain boundary sliding) in the vicinity of the austenite grain boundaries forms, causing grain boundary embitterment. When the slab is subjected to tensile stress of bending, straightening or number zero dislocation segments at the temperature range, the cracks generate. The austenite grains are more coarse, the austenite grain boundary are more dispersed and fine, the more prone to cracking. The guarantee of continuous casting machine equipment precision and formulation of appropriate continuous casting process parameters are the most effective measures to eliminate?the corner transverse?cracks in?continuous casting slab.
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Received: 31 March 2014
Published: 10 February 2015
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XU Li-ping，WANG Hong-feng. Research and practice on corner scarring defect of continuous casting slabs[J]. , 2019, 38(1): 40-43. |
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JIANG Li-mei，LIU Qing-gang. Research and Improvement of edge cracking of J55 slab[J]. , 2018, 37(2): 41-45. |
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TANG Wei，MENG Ling-tao， SUN Li-bin， BU Zhi-sheng， LI You-huai， WANG Lei， DOU Kun， HAN Yan-shen， LIU Qing. Cause analysis and improving measures of central crack in continuous casting slab of Q235B steel[J]. , 2017, 36(5): 59-65. |
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LIU Ke,SUN Qi-song,WANG Li-feng,ZHANG Jia-quan. Optimum total soft reduction amount for continuous casting slab with different thickness[J]. Chinese Journal of Iron and Steel, 2017, 29(2): 111-116. |
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ZHANG Jian-jun，，ZHANG Hui，XI Chang-suo，TAN Wen，WANG Chun-feng. Analysis and control of transverse corner cracking formation on middle carbon steel in thin slab casting[J]. Iron and Steel, 2017, 52(11): 32-36. |
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FAN Xing-chen. Research on improving the surface quality of 400mm ultra-thick slabs with the technology of 3D sprays[J]. , 2017, 36(06): 50-52. |
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2015, Vol. 34 
