Improvement In Surface Brightness And Prediction Of Spangle Formation Time In A Continuous Galvanising Line Through Heat Balance

M. DUTTA; S. GANGULY; G. JHA

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Improvement In Surface Brightness And Prediction Of Spangle Formation Time In A Continuous Galvanising Line Through Heat Balance

机译：通过热平衡提高表面亮度并预测连续镀锌生产线中的光亮形成时间

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Galvanised spangle products from the continuous galvanising line-2 (CGL-2) at Tata Steel used to exhibit significantly lower ratio of bright to dull spangles, compared to CGL-1 products. The solute enriched surfaces of dull areas are more susceptible to premature darkening on external exposure. An effort was made here to understand this problem and improve the surface quality of spangle products from CGL-2, as well as to predict the end of zinc solidification i.e. the spangle formation time on steel sheets through heat balance study. Attention was paid on a few parameters such as strip temperature before entry to zinc bath, bath temperature and line speed. A comparative heat balance calculation for zinc solidification revealed that the total heat required to be removed was more in case of CGL-2, whereas the amount of cooling after galvanising was less as compared to CGL-1. This results in extended solidification in CGL-2 during which more solute rejection may occur producing more dull areas. Based on these observations plant trials were carried out at lower temperature of zinc bath, and the bright areas from coil samples were measured. An improvement in bright areas from 25-30 percent to 35-40 percent was observed. The surface brightness improved up to 56 percent at lower line speed. The heat balance calculation also predicted the approximate positions of the formation of spangles at the end of zinc solidification, which were close with actual observations in the plant.

机译：与CGL-1产品相比，塔塔钢铁公司（Tata Steel）的连续镀锌生产线2（CGL-2）的镀锌花饰产品过去通常表现出明显较低的亮角与钝角花饰比率。暗区富集溶质的表面在外部暴露时更容易过早变黑。为了了解这一问题并改善CGL-2的亮花产品的表面质量，并通过热平衡研究来预测锌的凝固结束，即在钢板上的亮花形成时间，我们在这里进行了努力。注意一些参数，例如进入锌浴前的带钢温度，浴温和生产线速度。锌凝固的比较热平衡计算表明，对于CGL-2，需要去除的总热量更多，而与CGL-1相比，镀锌后的冷却量更少。这导致CGL-2中的固化时间延长，在此期间可能发生更多的溶质排斥，从而产生更多的钝化区域。基于这些观察，在较低的锌浴温度下进行了植物试验，并测量了卷材样品的亮区域。观察到明亮区域从25％到30％改善到35-40％。在较低的线速度下，表面亮度提高了56％。热平衡计算还预测了锌凝固结束时锌片形成的大概位置，该位置与工厂中的实际观察结果相近。

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来源
《ISIJ international》 |2005年第3期|p.366-372|共7页
作者
M. DUTTA; S. GANGULY; G. JHA;
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作者单位

Tata Steel, Jamshedpur-831 001, India.;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类黑色金属材料;
关键词
galvanising; surface brightness; spangle formation; zinc solidification; heat balance;

机译：镀锌;表面亮度;光亮形成;锌凝固;热平衡;

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Improvement In Surface Brightness And Prediction Of Spangle Formation Time In A Continuous Galvanising Line Through Heat Balance

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