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Zhao J.-Y.,University of Science and Technology Beijing | Zang Y.,University of Science and Technology Beijing | Yin D.-Q.,Laiwu Iron and Steel Co
Suxing Gongcheng Xuebao/Journal of Plasticity Engineering | Year: 2013

Reversing break-down rolling processes of different sizes of H-beam were simulated by ABAQUS software using explicit method in this paper. The technology of mesh adaptation (ALE) was used to solve the problem of mesh distortion in multi-pass rolling. The simulation model was more accurate by introducing the measurement data of temperature. The results indicated that the groove obviously affected the final cross-section of break-down rolling. When broadening groove was used to roll large size H-beam, the cross-section of rolled pieces in last pass didn't match the groove, which caused the incomplete flange. When box groove was used to roll small size H-beam, the cross-section of rolled pieces in last pass almost matched the groove. The cross-section dimension of H700×300 was verified by the measurement data. According to the above phenomena, the groove of large size H-beam has been optimized to improve the incompleteness of flange. Results of this study could provide guidance for designing rolling schedule of BD.

Wu S.-L.,University of Science and Technology Beijing | Wu S.-L.,Control Iron and Steel Research Institute, China | Han H.-L.,University of Science and Technology Beijing | Li H.-X.,University of Science and Technology Beijing | And 4 more authors.
International Journal of Minerals, Metallurgy and Materials | Year: 2010

The basic sintering characteristics of Yandi ore from Australia, including assimilation ability, liquid phase fluidity, self-strength of bonding phase, forming ability of silico ferrite of calcium and aluminum (SFCA), and so on, were investigated in detail. Besides, the high temperature behavior and function of sintering were obtained. As a result, the techniques for ore-proportioning in sintering were obtained. The results show that Yandi ore possessing higher assimilation ability, better liquid phase fluidity, lower self-strength of bonding phase, and better forming ability of SFCA, should be mixed with iron ores whose properties are opposite to those of Yandi ore. In the optimization of sintering ore-proportioning, Yandi ore, whose price is relatively low, can be mixed as high as 40wt%. © University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg 2010.

Li H.,Shandong University | Wang Z.-C.,Shandong University | Xue C.-S.,Shandong University | Zhuang D.-D.,Shandong University | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2013

To study the effect of alloying elements, Nb, B and Ni, on lamination crack resistant property (Z-direction property) of high strength low alloy H-beam steels, contrast experiment was designed. Microstructure, composition and mechanical properties, especially the Z-direction property of the experimental steels were investigated by means of SEM, XRD, TEM, EDS analysis and tensile test. The results indicate that the microalloy elements of Nb, B and small amount of Ni do harm to the lamination crack resistant property, and the experiment steel of Q345E, which contains Nb, B, Ni and lower inclusions, exhibits lower Z-direction property after ladle refining than the steel of Q345B, which does not contain Nb, B, Ni and does not experience the refining process. Mechanism of this phenomenon is mainly ascribed to the effect of Nb, B and Ni on obstruction of dislocations at grain boundaries and inside grains.

Li Z.-F.,Laiwu Iron and Steel Co | Dong S.-S.,Shandong University | Lin Q.-N.,Laiwu Iron and Steel Co | Guan S.-J.,Laiwu Iron and Steel Co
Corrosion and Protection | Year: 2011

The corrosion of gas pipeline inwall due to dried blast furnace gas after dedusting in Laiwu Steel analyzed. A protection program using vapor corrosion inhibitor was proposed. The industrial tests proved feasibility of the program.

Wang B.,University of Science and Technology Beijing | Liu Q.,University of Science and Technology Beijing | Yang Z.,University of Science and Technology Beijing | Yang Z.,Laiwu Iron and Steel Co
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2013

The criticality evaluation criteria system of equipment, which consists of reliability, maintainability, economy and monitoring factors, fuzzy analytic hierarchy process (FAHP) was established and employed to determine the relative initial weights of various criticality factors considering the fuzziness of these factors, and the consistency adjustment method for fuzzy judgment matrix was proposed. Then the criticality index (CI) for 12 subsystems of electric arc furnace (EAF) steelmaking process was calculated by adopting Monte Carlo simulation. Moreover, the criticality area index was used to represent the importance level of equipment, and the equipment system was divided into four categories according to this indicator, including critical equipment, main equipment, general equipment and minor equipment. Maintenance strategy was presented based on the classification of equipment in steel plants. The results show that the methodology of equipment criticality calculation based on FAHP and Monte Carlo simulation can alleviate the impact of subjective factors, and is easy to implement, therefore, it is highly significant to improve system reliability and availability, and to ensure the steel production process running continuously, stably and efficiently by applying this method to maintenance decision-making for complex equipment systems in steel plants.

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