EVOLUTION OF INCLUSIONS IN COMMON ORIENTED SILICON STEEL
Samples were taken from the RH refining process,tundish and ingot,the changes in the number,size and type of inclusions were statistically analyzed by using scanning electron microscopy,metallographic microscopy and nitro-gen-oxygen analyzer as well as the T[O]content during the refining of conventional grain-oriented silicon steel.From the entry into the RH station to the formation of the ingot,the T[O]content in the steel gradually decreased to 0.001 5% .The de-oxidation products at the RH station entry were predominantly Al2O3-SiO2.The inclusions in the steel at the RH station exit,within the tundish and in the ingot were primarily composed of Al2O3-SiO2-CaO and Al2O3-SiO2-CaO-MgO.The number of inclusions in the steel progressively reduced from the RH station entry to the ingot.Inclusions larger than 20 μm in size were almost entirely floated out after exiting the RH station.The size of inclusions in the tundish and ingot were found to be pre-dominantly less than 10 μm.
Oriented silicon steelOxygen content in steelInclusions
万方数据
维普
