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Kunming Iron and Steel 800,000 t bars line PQS controlled cooling process and control

Author: ZhouJianXun
Tutor: WangQingXin；LiYueWu
School: Kunming University of Science and Technology
Course: Computer technology
Keywords: steel bar through water cooling technique automatic control
CLC: TP273.5
Type: Master's thesis
Year: 2007
Downloads: 79
Quote: 0
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Abstract


In the increasing competition of the steel industry, every steel company is in expansion, through improving their product structure, paying attention to technological improvements, importing advanced production techniques, developing special products, lowering costs, increasing their market portion, maximizing productivity, and promoting competitiveness. In the steel rolling production, the technique of controlled-rolling and controlled-cooling is often used to strengthen steel. This advanced technique could simplify the production procedure and save energy. By using technological means to excavate the potential of steel, it has largely improved the comprehensive performance of steel and, consequently, it has brought tremendous economical benefits to the steel company and the society. In the past several decades the strengthening of steel has been relying on adding alloy elements or the heating treatment after hot-rolling. On one hand, these methods extended the production circle while increasing the cost; on the other hand, the improvement of strength in performance, in many cases, was at the cost of losing ductility and damaging weld. In the past 20 years, the technology of controlled-rolling and controlled-cooling has received great attention from the international metallurgy field. Controlled-rolling technique normally requires relatively lower finishing temperature or bigger deflection, thus it would increase the workload of rolling mill. Controlled-cooling technique was developed to solve this problem. Controlled-cooling of hot-rolled steel is for improving the organization status of steel, improving its performance, shortening its cooling time and promoting the productivity of rolling mill. Controlled-cooling after rolling can also prevent steel from distortion and bending caused by uneven cooling. Moreover, it can reduce the oxidization of steel sheets.The Steel Bar Mill of Kunming Steel Cooperation adopted Italian company POMONI’s PQS Through Water Cooling Technology and Automatic Control Process for its steel bar production line. Set against this background, this thesis particularly addresses how those automatic control systems and control parameters developed by foreign companies were understood and applied, how the PQS control software were redeveloped according to the actual steel rolling condition and how it was used in the actual production processes to achieve good effects.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Automatic control,automatic control system > Computer control, computer control system
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