On May 27, a delegation from RAL led by Academician Wang Guodong went to Tangsteel Plate Co., Ltd and held a mid-year summing-up meeting on product upgrading-related projects of Tang Steel’s plate products. Vice General Manager of Tangsteel Zhang Hongbo, Deputy Chief Engineer of Tangsteel Dong Hemin, General Manager of Tangsteel Plate Co., Ltd Liu Tieli, Deputy General Manager Liu Zhiyuan and Zhang Kuobin and other delegates listened to RAL’sreports on the progress of each project, and held an in-depth discussion on some technical issues. All the leaders and experts participated in the meeting were quite satisfied with the progress of projects undertaken by Northeastern University. They were more than pleased to see that teachers from NEU could find out problems in the actual production and figure out ways to solve these problems, which provides a strong guarantee for the smooth production, cost reduction and improvement of production efficiency.
In the first half of 2016, the progress made by various project teams is summarized as follows:
The team led by Prof. Zhu Miaoyong has successfully completed the development of long life mold nozzle technique, control technique for flow field in tundish, new type curved-surface mold technique and super-fine grain control technique of casting billet corner second cooling high temperature zone. These techniques have obvious effect in application, such as realizing 1 mold nozzle casting 16hrs in continuous casting, the grading of both type A and type B inclusions reaching Level 1.0, no cross track in continuous casting slab ranging 0-20mm.
The team led by Prof. Liu Zhenyu carried out reduction industrial trial-produce of high-strength high-rise construction steel with a variety of specifications with the thickest reaching 70mm, and the steed produced can meet the requirements of the performance index; they have completed key technology research for EH32, EH40 and EH500 shipbuilding and marine work steel, Q500qENH weather-proof bridge steel, and Q550 and Q690 construction machinery steel, and have determined the industrial trial-produce schemes, including lost-cost component system of each type of steel, slab heating, rolling and cooling path. In addition, they have developed sinter control technology for ship plate and weather-proof steel, completed many rounds of industrial-produce, and mastered high surface-quality control technology, significantly improving the surface quality of the plate.
The team led by Du Linxiu have completed the chemical component reduction and technology optimization of high-grade steel of Tangsteel Plate Co., Ltd under ultra-fast cooling technology, which have not only greatly reduced production cost, but also realized the overall quality upgrading of high-quality steel; they have also improved the chemical components and optimization technology in the production of new standard bridge steel, and studied on the welding technology and micro-structure & properties of V-N QS50D plates, which has good performance in welding.
The team led by Wang Jun has undertaken the automation system transformation of first rolling line and second rolling line in Tangsteel Plate Co., Ltd and the development of plane shape control technology. So far, they have completed the transformation of automation control system of the first line and second line with various functions and technical indicators meeting the requirements in the contract, and successfully passed acceptance test; the plane shape control they have developed also has remarkable effect and could reach the mid-term technical indicators.
The team led by Prof. Wang Zhaodong has developed the ultra-fast cooling system for Tangsteel Plate Co., Ltd and real-time cooling system for double stand plate production line, which is the first in China. Up to now, the ultra-fast cooling system could meet the cooling needs of plates with various strength, with automation input rate in the control system reaching 96.7%, and the hit rate of integrated temperature of different thickness reaching 94.4%, and the roughness after on-line quenching about 10mm/2m, thus it has already reached the requirements of acceptance test. Real-time cooling system is used in the cooling of intermediate slab, which could save 30-50% of the waiting time for the cooling. They plan to develop coupling control of deformation and temperature control to debug the production of high-quality super-thick plate.