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采用扫描电镜观察了W600冷轧无取向电工钢表面“黑线”和纵向发裂缺陷的形貌。成品带钢表面“黑线”缺陷的成因是连续退火炉均热段(SF段)内炉辊结瘤划伤带钢下表面,高温下异物嵌入划伤处,并被涂层覆盖;冷硬带钢和成品带钢纵向发裂缺陷则是连铸坯中的铝酸盐复合夹杂物在热轧、冷轧过程中由于变形而破碎并被压出至表面导致的。为了减少“黑线”缺陷,要定期更换碳套辊;将通入H2+N2+H2O湿混合气由原来的6段通入改为4段,并将各段的炉温上限调整为880℃。为减少纵向发裂缺陷,在精炼及连铸工序严格控制钢中夹杂物,保证结晶器内液面波动在±3 mm～±5 mm。
Scanning electron microscopy was used to observe the morphology of the “black line” and longitudinal cracking defects on the W600 cold-rolled non-oriented electrical steel. The cause of the “black line” defects on the surface of finished steel strip is that the lower surface of the steel strip nodules in the soaking zone (SF segment) of continuous annealing furnace is embedded in the scratched area under high temperature and is covered by the coating; Longitudinal cracking of cold-formed steel strip and finished strip is due to the deformation of the aluminate composite inclusions in the slab which are crushed and pressed to the surface during hot rolling and cold rolling. In order to reduce the “black line ” defect, to regularly replace the carbon roller; will pass into the H2 + N2 + H2O wet mixed gas from the original 6 into the paragraph 4, and the upper limit of the furnace temperature adjusted to 880 ° C. In order to reduce longitudinal cracking defects, strict control of inclusions in the refining and continuous casting process to ensure the liquid level fluctuation in the mold ± 3 mm ~ ± 5 mm.