| 摘要 |
PURPOSE:To improve economically the surface roughness and space factor of a silicon steel strip after finish annealing by coating a suspension of MgO having a specific grain size as a separating agent for annealing on the surface of the steel strip after decarburization annealing and using again the remaining liquid after filtering. CONSTITUTION:MgO is coated as the separating agent for annealing in the stage of the succeeding finish annealing onto the grain oriented silicon steel strip 21 subjected to decarburization annealing. The MgO suspension in a tank 24 is injected from upper and lower spray nozzles 27A, 27B to the front and rear of the steel strip by a pump 25. The MgO suspension emitted from the upper spray nozzle 27A is filtered by a 240-100-mesh filter 31 so that only the fine MgO is coated to the steel strip. The coarse MgO of the suspension from the lower spray nozzle 27B falls by gravity and only the fine MgO sticks to the steel strip. The strip is passed through rolls 29A, 29B and dryer 35 and is then coiled. The coil is sent to the final finish annealing furnace. The excess suspension which does not stick to the steel strip is filtered by the filter 34 and is returned to the tank 24. |
