湘钢低磷钢种自动引流率提升实践

Practice of Improving Automatic Flow Rate of Low-Phosphorus Steel at Xiang Steel Huang

摘要

本文针对低磷钢种钢包自动引流率偏低的问题，开展了引流砂材料特性与工艺优化研究。低磷钢种冶炼对钢水洁净度要求高，引流失败后的烧氧操作易导致钢水二次氧化增磷，严重影响产品质量。通过控制钢水罐底部结冷钢、控制引流砂0.1-0.5MM颗粒度占比75%以上、改进钢水罐水口座砖、引流砂砂面添加5-8KG碳化硅、优化现场工艺操作等措施，实现了低磷钢种自动引流率由98%提升至99.50%以上，最高值达到99.80%，烧氧次数由月均50次降至10次以内，因烧氧导致的低磷钢种铸坯改判比例减少85%，年综合经济效益约300万元。本研究为低磷钢种高效浇注提供了技术支撑。

Abstract

This paper addresses the issue of low automatic tapping rate in ladles for low-phosphorus steel and conducts research on the characteristics of tapping sand materials and process optimisation. The smelting of low-phosphorus steel requires high steel cleanliness, and post-tapping oxygen blowing operations can easily lead to secondary oxidation and phosphorus increase in the steel, seriously affecting product quality. By controlling the solidified steel at the bottom of the ladle, ensuring that particles of 0.1-0.5mm make up more than 75% of the tapping sand, improving the ladle mouth seat bricks, adding 5-8kg of silicon carbide to the tapping sand surface, and optimising on-site process operations, the automatic tapping rate of low-phosphorus steel was increased from 98% to over 99.50%, with a maximum of 99.80%. The average monthly oxygen blowing times decreased from 50 to fewer than 10, and the ratio of low-phosphorus steel castings reclassified due to oxygen blowing was reduced by 85%, resulting in annual comprehensive economic benefits of about 3 million yuan. This study provides technical support for efficient casting of low-phosphorus steel.

关键词

自动引流率 / 低磷钢种 / 钢水纯净度

Key words

automatic tapping rate / low-phosphorus steel / steel cleanliness

参考文献

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