(1. Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China 2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing 100043, China 3. National Engineering Laboratory of Advanced Coating Technology for Metal Materials, China Iron and Steel Research Institute Group, Beijing 100081,China)
Abstract:To research potential of applying local dew point technology on Al-bearing high strength steel,effects of dew points during heating on selective oxidation behavior of a C-Mn-Si-Al steel were studied through a hot-dip process simulator (HDPS). The dew points during heating were set as -10,-20 and -50 ℃,respectively,while the dew point during soaking was -50 ℃. External surface of as-annealed steel samples was characterized by SEM/EDS. Alloying element profiles were detected by GDOES. Kinds of compound on the external surface were identified by XPS. As heating with the dew point of -10 ℃,little oxides could be found on the external surface and remarkable internal oxidation of Al could be found. As the dew point during heating decreased to -50 ℃,much more oxides composed with manganese and aluminum were observed on the external surface. Therefore,high dew point during heating extremely suppress enrichment of alloying elements and formation of oxides on the external surface for the C-Mn-Si-Al steel.
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