Effect of Microstructure on Resistance to Buildups Formation of Carbon Sleeves in Continuous Annealing Furnace for Silicon Steel Production
Graphite, which has a unique stack structure that enables a small friction coefficient, is the best hearth rolls to support and convey silicon steel strip in continuous annealing furnace. However, the buildups formation in/on the surface of carbon sleeve has always been a worldwide difficulty in silicon steel industry. The operating conditions of carbon sleeve are introduced. Based on the analysis of the microstructure and topography of the buildups, combined with the microstructure and topography of carbon sleeve, the causes of forming buildups are discussed. The results show that buildups experience the process from nucleating to growing-up, and the sizes and shapes of buildups have relations to the pore sizes and shapes in the surface of carbon sleeve. Meanwhile, some countermeasures to reduce the buildups formation in the surface of carbon sleeve are proposed.
KeywordsCarbon sleeve Microstructure Buildup formation Silicon steel Continuous annealing
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