Surface micro-cracks in LSAW steel pipe products have a great impact on quality, from the commutation of sentences, and retirement, especially niobium, vanadium, titanium vertical most prominent, seriously affected the product quality and yield improvement. This not only brought enormous economic losses to the enterprise, but also restricted the development of varieties of sheet metal production lines. Longitudinal surface microcracks are mainly edge cracks, longitudinal cracks, star cracks, the reason for both the rolling process parameters are not properly controlled, but also abnormal casting production, slab cracks, residual element enrichment.
Longitudinal surface micro-cracks seriously affect product quality. Longitudinal surface micro-cracks is the main reason for continuous casting copper mold off. This will lead to infiltration of copper into the solidified shell austenite grain boundaries, grain boundary cracks; the other hand, due to uneven thermal stress cracks, titanium-containing steel crack sensitivity, performance is particularly evident. Control measures: Improve the quality of mold copper and copper to prevent dew condensation; Strengthen inspection quality and vertical production before production; Vertical protection Improve vertical steel cleanliness through good casting and other measures.
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