Effect of boron element addition on oxidation behavior of pickled plates
WANG Chang1,3, YU Yang1,3, WANG Lin1,3, ZHANG Yan1,3, GUO Zi-feng1,3, WU Xin-lang2
1. Shougang Research Institute of Technology, Beijing 100043, China; 2. Manufacturing Department, Beijing Shougang Co., Ltd., Beijing 100043, China; 3. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Techology, Beijing 100043, China
Abstract:To analyze the oxidation characteristics, oxidation activation energy and interface interaction characteristics on low carbon aluminum killed steel, the oxidation behavior of boron on pickled plates of low carbon aluminum killed steel was systematically studied by differential thermal analyzer. The results show that the oxidation resistance of pickled plates decreases obviously after adding boron element, the oxidation activation energy decreases from 12.02 kJ/mol to 8.52 kJ/mol, and the oxidation weight gain rate increases from 0.239%/min to 0.323%/min. At high temperature, boron element appeares interfacial enrichment and forms complex oxidation phase with silicon oxide, thus reducing the adhesion of oxide scale. At the same time, the oxidation weight gain rate of boron-containing steel increases obviously at 1 100 ℃, and the oxidation resistance is insufficient, resulting in the obvious increase of the oxide scale thickness. When the oxide scale thickness exceeds the critical deformation thickness, it is also easy to cause rolled-in oxide scale. The pitted rolled-in oxide scale defect on the surface of boron-containing steel can be improved by appropriately reducing the finish rolling inlet temperature and adding element silicon.
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