Analysis of formation mechanism about Ca-Mg-Al spinel type inclusions in cold thin rolling sheet |
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| Authors: | ZHAO Xianjiu ZHANG Jieyu LI Chuanjun |
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| Affiliation: | 1.Research Institute, Baoshan Iron and Steel Co., Ltd.， Shanghai 200941, China；2.School of Materials Science and Engineering, Shanghai University， Shanghai 200444, China；3.State Key Laboratory of Advanced Special Steel， Shanghai 200444, China |
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| Abstract: | The cracking of ultra low carbon Al deoxidized killed steel during cold rolling and stamping was analyzed by SEM and EDS. It was determined that the main inclusions consisted of Al2O3, CaO and MgO, which are Ca-Mg-Al spinel inclusions. The composition of the ladle top slag and corrosion of the tundish covering agent and coating were investigated, and the source of inclusions was discussed. It was found that Al2O3 is the product of deoxidation and secondary oxidation. The source of CaO is the reaction between CaO of higher activity in slag with acid soluble aluminum Als in molten steel, which leads to the entry of element Ca into molten steel and the formation of CaO with oxygen in molten steel. The reaction of MgO, which comes from MgO in tundish covering slag and MgO corroded from tundish coating, with Als in molten steel leads to element Mg entering molten steel, and then MgO is formed with oxygen in molten steel. |
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| Keywords: | Key words：inclusion acid soluble aluminum cold rolled sheet steel continuous casting mold powder control measure |
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