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Ma W.,Shougang Institute of Technology | Li H.,Shougang Institute of Technology | Cui Y.,Shougang Institute of Technology | Chen B.,Shougang Institute of Technology | And 2 more authors.
ISIJ International | Year: 2017

A kinetic model of the 60% Mg and 40% CaO injection desulphurization was established. The simulation results from the model were verified by sampling, and it was in accord with the sampling results. By analyzing the model, the desulfurization process of high sulfur molten iron had three stages, incubation stage, rapid desulfurization stage and slow desulfurization stage. In order to improve the dynamic conditions and the utilization rate of the desulfurization agent, for the molten iron of sulfur content ≥0.035%, a new injection desurphurization mode was developed and applied. The smaller injection rate of powder and the larger flow rate of nitrogen were used in the slow desulfurization stage. Compared with the conventional process, the consumption of the desulfurizing agent is reduced by 10-20% by using the two-stage injection method. © 2017 ISIJ.


Gong J.,University of Science and Technology Beijing | Gong J.,Shougang Qianan Iron and Steel Company | Liu H.-P.,Control Iron and Steel Research Institute, China | Wang X.-H.,Shougang Qianan Iron and Steel Company | Bao Y.-P.,University of Science and Technology Beijing
Journal of Iron and Steel Research International | Year: 2015

The electromagnetic field and flow analysis model were developed to simulate the electromagnetic field and the flow pattern in a vertical curved continuous slab caster with the in-roll type strand electromagnetic stirring. The transient electromagnetic field distribution and the induced electromagnetic force were numerically described. The effects of stirring current, stirring frequency, and different stirrer configurations on the electromagnetically driven flow field in the strand were investigated and the optimization of the stirring parameters was discussed by performing a relative comparison of numerical results. Results show that the in-roller type strand electromagnetic stirrer (SEMS) pair generates the fluctuating magnetic fields, penetrating through the cast slab and periodically parallel shifting along the slab wide face with time evolution. The transient induced electromagnetic forces travels toward the magnetic flux shifting direction. Different stirring parameters (i. e. current and frequency) and stirrer configurations affect the stirring strength and the flow recirculation pattern in the strand, which are closely related to metallurgical performances of the stirrers. There is an optimum frequency to obtain the maximum stirring. The present model provides a relatively theoretical insight into the in-roll type strand electromagnetic stirring system for best operating. © 2015 Central Iron and Steel Research Institute.


Li C.,University of Science and Technology Beijing | Cheng G.,University of Science and Technology Beijing | Cui A.,Shougang Qianan Iron and Steel Co.
Advanced Materials Research | Year: 2011

Through the mathematical model of RH vacuum decarburization, the decarburization mechanism of argon gas bubble surface was studied. By the RH equipment of Shougang Qian'an Iron and Steel Co. Ltd for background, the calculated results of this model showed that the decarburization quantity of argon gas bubble surface was about 8% that of overall decarburization. In the initial conditions was constant, the ascension of argon flowrate will promote the decarburization quantity of argon gas bubble surface, free surface and splash droplet surface as well as reducing the decarburization quantity of internal liquid steel decarburization. Based on the commercial production data, it was found the best opportunity of ascension blow argon flowrate to acquire lower carbon content in relatively shorter time. © (2011) Trans Tech Publications, Switzerland.


Chen B.,Shougang Institute of Technology | Pang Z.,Shougang Institute of Technology | Liu B.,Shougang Institute of Technology | Qing J.,Shougang qianAn Iron and Steel Co.
Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015 | Year: 2015

High efficiency decarburization in RH refining process and carbon pick-up in continuous casting are two keys to produce extreme low carbon steel(C ≤ 0.0013%). Decarburization process can be divided into two stages, rapid decarburization period and slow decarburization period. The main parameters that affect the rapid decarburization rate are initial carbon and oxygen content before RH treatment and the pressure drop model in vacuum vessel. The ultimate vacuum treatment time is the main parameter that affects the slow decarburization and the end-point carbon content. In this paper the parameters that affect decarburization and carbon pick-up are studied and some conclusions can be made as follows. Control the initial [C] and initial [O] in molten steel and eliminating the pressure drop platform can accelerate the decarburization rate. The optimal initial [C] and initial [O] are (0.02-0.025)% and (0.05-0.07)% with the value of initial [C]/[O] is 0.3-0.4. By decreasing the carbon content of refractory materials of ladle, tundish powder and tundish working lining, the carbon pick-up in molten steel can be controlled less than 0.0002%. Through all the measures, the qualified rate of extreme low carbon steel has been improved from 30% to more than 95%.


Zhao D.,Shougang Institute of Technology | Li H.,Shougang Institute of Technology | Zhu G.,Shougang Jingtang United Iron and Steel Co. | Gao P.,Shougang Institute of Technology | Yang J.,Shougang qianAn Iron and Steel Co.
Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015 | Year: 2015

The accurate control of inclusions is becoming more important to achieve the higher cleanliness in steel. This study focuses on effect of aluminum and sulfur content on alumina modification by calcium treatment, based on systematic sampling during the processes of BOF-LF-calcium treatment-tundish-continuous casting. It is found that when the same Ca wire amount being fed, inclusion characteristics are obviously different owing to the different aluminum and sulfur content before calcium treatment in different heats and alumina inclusions are more difficult to be modified by calcium into calcium aluminates with increasing sulfur content and aluminum content in steel. A new method of dynamically adjusting Ca wire amount being fed into molten steel was put forward according to temporal steel composition, especially aluminum and sulfur content to better modify alumina inclusions and remove them.


Zhang Q.,Northeastern University China | Cai J.-J.,Northeastern University China | Pang X.-L.,Northeastern University China | Jiang W.-H.,Shougang Qianan Iron and Steel Co.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2011

The optimal distribution of the gas as the by-product of an iron and steel complex between the gas holder and the boiler in its self-supply power plant is discussed, involving the effects of the position control of gas holders, change in fuel loading of the boiler and variation of purchase price of additional fuel on the cost of operation. An optimal gas distribution model is thus developed with a relevant penalty function deduced to solve these problems. The results indicated that the optimal gas distribution between gas holders and self-supply power plant is available to decrease the fuel purchased externally and reduce the frequent change in fuel loading of the boiler, thus improving the power supply efficiency and enabling the zero gas emission so as to make the operation of gas supply system safe, economic and stable.


Liu K.,Shougang Institute of Technology | Li F.,Shougang Institute of Technology | Wu N.,Shougang Qianan Iron and Steel Co. | Guo J.,Shougang Institute of Technology | And 2 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2012

The copper enrichment behavior in copper-containing steel with low Ni/Cu ratio of 0.39 was investigated under the conditions of different heating temperatures and heating rates by using thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The results show that there are rich phases including mainly copper-nickel-rich phase and nickel-rich phase dispersed as particles in the interior of oxide scale or on the interface of oxide scale and steel substrate heated at 1050~1300°C. Excepting at 1250°C, with increasing heating temperature, Ni/Cu ratio in the rich phases increases gradually, and the rich phases are only nickel-rich phase at 1200°C and 1300°C. When the heating temperature is 1250°C, the Ni/Cu ratio of rich phases and the interface morphology of oxide scale and steel substrate are varied with heating rates. It is in favor of Ni/Cu ratio increasing at the lower heating rate of 5°C/min or the higher heating rate of 15°C/min, while the Ni/Cu ratio decreases at the heating rate of 10°C/min. The interface of oxide scale and steel substrate will become smooth when increasing heating rate and shortening the heating time which is convenient for descaling and improving the surface quality of steel. For producting copper-containing steel with low Ni/Cu ratio and high surface quality, the heating temperature of 1180~1220°C or 1280~1320°C can be adopted, and when the heating temperature of 1220~1280°C is adopted, the heating rate should be controlled about 15°C/min in the third stage of walking beam furnace under weak oxidizing atmosphere.


Zhang Z.M.,Shougang Institute of Technology | Wang F.Q.,Shougang Institute of Technology | Li F.,Shougang Institute of Technology | Wang S.Z.,Shougang Qianan Iron and Steel Co | Jiang X.,Shougang Qianan Iron and Steel Co
Advanced Materials Research | Year: 2014

Coiling temperature, finish rolling temperature and running speed of ZSAC1 strip during U-type cooling and number of valves which had been turned on were analyzed in order to find out the reason of low coiling temperature at tail of ZSAC1 strip in U-type cooling process. Results of research showed that running speed of strip and finish rolling temperature were main factors affecting accuracy of coiling temperature. Coiling temperature decreased with the increase of running speed of strip. Coiling temperature fluctuation would occur at the same part of strip when finish rolling temperature increased or decreased. Holding rolling speed and rolling temperature of strip stably can improve accuracy of coiling temperature during downstream U-type cooling. © (2014) Trans Tech Publications, Switzerland.


Li Y.,University of Science and Technology Beijing | Wang F.,University of Science and Technology Beijing | Li C.,University of Science and Technology Beijing | Yang Z.,University of Science and Technology Beijing | And 2 more authors.
AISTech - Iron and Steel Technology Conference Proceedings | Year: 2016

The influence of titanium on the microstructure evolution and mechanical properties of high strength automobile beam steel has been researched by means of Gleeble-3500 simulator, optical microscope, and scanning electric microscope (SEM). The results suggest that the microstructure is finer in Ti-bearing steel than that in Ti-free steel under the same deformation and cooling conditions. And the amount of acicular ferrite is relatively higher in Ti-bearing steel than that in Ti-free steel. Due to the refining effect of Titanium on the austenite grain and bainite packets, tensile strength of Ti-bearing steel is higher than that of Ti-free steel. © 2016 by AIST.


Li C.-W.,Beijing Beiye Functional Materials Corporation | Cheng G.-G.,University of Science and Technology Beijing | Wang X.-H.,University of Science and Technology Beijing | Zhu G.-S.,Shougang Qianan Iron and Steel Co Ltd | Cui A.-M.,Shougang Qianan Iron and Steel Co Ltd
Journal of Iron and Steel Research International | Year: 2012

A mathematical model in present study has been established to investigate the effect of Rheinstahl Heraeus (RH) blow argon mode on the decarburization rate in ultra-low carbon steel refining based on the RH equipment of Shougang Qian'an Iron and Steel Co Ltd (SQISCO). The calculated results show that the increase of argon flowrate promotes the carbon elimination from argon gas bubble surface, molten steel free surface in vacuum as well as splash droplet surface, while reduces that from the interior of liquid steel. It has been found the critical turning point of flowrate ascension is at the 5 th minute and the optimum blow argon flowrate in later stage is 2100 L/min in accordance with the 2 stages argon blow mode, which have been confirmed in the commercial production in SQISCO. © 2012 Central Iron and Steel Research Institute.

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