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Nanjing, China

Xiao J.-L.,Meishan Iron and Steel Co | Yao T.-L.,Control Iron and Steel Research Institute, China | Qiu D.,Wuhan Iron And Steel Company | Wang G.,Meishan Iron and Steel Co
Kang T'ieh/Iron and Steel (Peking)

Based on the practice of product IF-steel in Meishan steel, the deep-decarbonization thermodynamic and dynamics principle of RH-KTB was briefly introduced. Through improving dynamics conditions, optimizing RH-KTB treatment process, controlling 15 kPa vacuum degree as the best time to start KTB process, optimizing KTB blowing oxygen system, improving vacuum degree of RH and circular flow and insertion depth of RH fire-resistant pipe, the RH end-point carbon content of IF steel was decreased from 18 × 10-6 to less than 15 × 10-6, which was the domestic advanced level of controlling carbon content of ultra low carbon steel. Source

Xia X.-M.,Northeastern University China | Xia X.-M.,Meishan Iron and Steel Co | Di H.-S.,Northeastern University China | Gao Y.,Meishan Iron and Steel Co
Journal of Iron and Steel Research

Black line once was a big product problem in Meishan Hot Strip Mill. According to the characteristic of the hot rolling line, the possible influence factors, which include coil box, table, roughing mill, edge draft of each pass, edge load distribute factors and edge roll shape, were experimented and analyzed. The results show that edge roll shape is a key factor for solving black line defect, and increasing the rolling temperature, making the load distribution factor reasonable and improving the quality of casting slab are benefit to black line defect. Source

Wang L.,Anhui University of Technology | Zhou Y.,Anhui University of Technology | Chen G.,Meishan Iron and Steel Co | Xu P.,Anhui University of Technology | Rao S.,Anhui University of Technology
Engineering Failure Analysis

The continuous hot-dip galvanizing line is performed by threading the steel strip through three rolls of the sink roll system (including sink roll, stabilizer roll and correcting roll) submerged in molen zinc. The premature failure of sleeves and bushings of the three rolls would result in increased cost of production and low production efficiency. According to the on-site investigation of Meishan Iron&Steel Ltd and theoretical analysis, it indicated that the dominant influencing factor of online life cycle was the abrasion between the sleeves and bushings. Insufficient abrasive resistance of sleeves and improper hardness ratio between sleeves and bushings led to rapid abrasion of sleeves. When the sleeves were manufactured by higher hardness materials, the online life cycle was increased from less than 15. days to about 20. days. © 2015 Elsevier Inc. Source

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