Genetic Analysis for Large TiN Inclusions in Wire Rod for Tire Cord Steel of SWRH82A |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;2. Research and Development Center of Wuhan Iron and Steel Group, Wuhan 430080, Hubei, China;1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;2. School of Metallurgy and Ecology Engineering, University of Science and Technology Beijing, Beijing 100083, China;3. Tangshan Iron and Steel Company of Hebei Iron and Steel Group, Tangshan 063016, Hebei, China;1. Laboratory for Excellence in Advanced Steel Research, Center for Structural and Functional Materials, Institute for Material Research and Innovation, University of Louisiana at Lafayette, P.O. Box 44130, Lafayette, LA 70503, USA;2. Nucor Decatur Sheet Mill, 4301 Iverson Blvd., Trinity, AL 35673, USA;3. CBMM North America, 1000 Old Pond Road, Bridgeville, PA 15017, USA |
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| Abstract: | The law of element segregation of Ti, N, Mn and S, and the sequence of selective precipitation of TiN and MnS inclusions during solidification of molten steel of SWRH82A are studied on the basis of thermodynamics. The origin of large TiN inclusions which affect the titanium inclusions point penalty in SWRH82A wire rod is analyzed based on the research on the distribution characteristics of MnS and large size of TiN inclusions observed on metallographic specimen of SWRH82A steel wire rod. The solidification segregation ratio of Ti is far more than that of N, and the solidification segregation ratio of S is far more than that of Mn. In the range of cooling rate of the continuous casting production, the cooling rate of solidification has little effect on the segregation ratios of Ti, N, Mn and S. MnS inclusions will precipitate earlier than TiN inclusions during solidification of the molten steel of SWRH82A. The large TiN inclusion which is wrapped by MnS in the SWRH82A wire rod may be foreign inclusions and it is not precipitated product during solidification in the molten steel of SWRH82A. |
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| Keywords: | tire cord steel of SWRH82A TiN inclusions solidification segregation |
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