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首页> 外文会议>第四届发展中国国家连铸国际会议（The 4th International Conference on Continues Casting of Steel in Developing Countries） >Research on Quality Control for Bloom Casting of High-Nitrogen and Vanadium Steel
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Research on Quality Control for Bloom Casting of High-Nitrogen and Vanadium Steel

机译：高氮钒钢大方坯铸件质量控制研究

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The primary cooling intensity was decreased and water distribution of mold wide and narrow faces was optimized in order to reduce surface depression of bloom. The length of secondary cooling zones and the specific water flow were increased, and the water flow distribution among the secondary cooling zones was adjusted to eliminate central defects, such as central porosity, central segregation and center line cracks. The operation shows that the proportion of surface depression decreased from 37.77% to 7.41%, while, the proportion of central porosity which is ≤1.0 increased from 79.71% to 90.70%, central segregation which is <0.5 increased from 1.45% to 44.19%, and center line cracks which is free increased from 39.13% to 62.79%. The qualified blooms are delivered to produce 310 Z-beam which Rel is≥450MPa.
机译：降低了一次冷却强度，并优化了模具宽面和窄面的水分布，以减少大方坯的表面凹陷。增加了二次冷却区的长度和比水流，并调节了二次冷却区之间的水流分布，以消除中心缺陷，例如中心孔隙率，中心偏析和中心线裂纹。该操作显示表面凹陷的比例从37.77％降低到7.41％，而中心孔隙率（≤1.0）的比例从79.71％增加到90.70％，中心偏析（<0.5）的比例从1.45％增加到44.19％，自由中心线裂纹从39.13％增加到62.79％。交付合格的大方坯以生产310Re-≥450MPa的Z型钢。

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