Improvement in Production Yield of Hot-rolled Coil by Controlling Process Cobbles

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Abstract The yield is dependent upon many factors, such as cobbles, total scrap generation, crop loss and scale loss. It appears that the huge quantity of scale is mainly responsible for the yield loss. However, by the correlation study, it reveals that the number of cobbles is the major contributor to the yield loss. The innovation lies in changing the focus of attacking the real problem by analysing the operating data which was not surfaced earlier. The focus shifted from the furnace to the mill and the cobbles studied through the years deeply. All the analysis proved to be helpful for the future prevention of the similar kind of failure. The internal target of bringing down the number of cobbles per month in single digit was taken. This also helped in improving the maintenance practice and reducing the amount of delays significantly. The yield was improved by 0.93%.

Key words�� hot strip mill, yield, cobble, scale loss, finishing mill, correlation

Received: 03 December 2015 Published: 18 October 2016

Corresponding Authors: Koushik Chakravarty E-mail: kaushik.chakravarty@tatasteel.com

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KOUSHIK CHAKRAVARTY. Improvement in Production Yield of Hot-rolled Coil by Controlling Process Cobbles[J]. Chinese Journal of Iron and Steel, 2016, 23(10): 1035-1043.

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http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/ OR http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/Y2016/V23/I10/1035