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Dong F.,Northeastern University China | Du L.,Northeastern University China | Liu X.,Northeastern University China | Jiao J.,Guofeng Iron and Steel Co Ltd
Materials Science Forum

In the this paper, the compositions design with low carbon and addition of sulfur andmanganese which can enhance fish-scale resistance by MnS as hydrogen trap was adopted to produceDC03EK cold-rolled enamel steel. The effect of sulfur and manganese contents on formability andfish-scale resistance of DC03EK cold-rolled enamel steel was investigated. Results show that yieldstrength, ultimate tensile strength, elongation, work hardening exponent and average plastic strainratio of the steel with sulfur content of 0.024wt% and manganese content of 0.22wt% is 133 MPa, 310MPa, 36.8%, 0.22 and 1.46, respectively, showing the well formability. And its hydrogen penetrationtime and diffusion coefficient is higher than 12 min and lower than 9.26×10-7 cm2/s, respectively,showing excellent fish-scale resistance. However, for the steel with sulfur content of 0.012wt% andmanganese content of 0.12wt%, even though better formability is obtained, the fish-scale resistance ispoor with hydrogen penetration time of 4.7 min and hydrogen diffusion coefficient of 2.36×10-6 cm2/s which is far from the expectation of steel for enamel. © (2013) Trans Tech Publications, Switzerland. Source

Wang X.-N.,Northeastern University China | Du L.-X.,Northeastern University China | Zhang C.,Northeastern University China | Xie H.,Northeastern University China | Jiao J.-M.,Guofeng Iron and Steel Co Ltd
Journal of Iron and Steel Research

Under the premise of the insurance of forming property and fish-scaling resistance, based on the composition of traditional cold-rolled sheet DC01, a low-cost and high hydrogen storage properties of enamel steel was developed by appropriate increasing in C, Mn and S contents and controlling the hot rolling, cold rolling and annealing process. The mechanical properties of the steel were: yield strength ≤270MPa, tensile strength ≤400 MPa and elongation ≥30%. The Fe3C and MnS were effective hydrogen storage traps. With the annealing temperature rising, the hydrogen permeation time reduced gradually for the reduction of the Fe3C. But after annealing temperature 730 °C for 5 h, the hydrogen permeation time of experimental steel still fulfilled the requirement. Through the wet enameling experiment, the credibility and practical value of the hydrogen permeation device were validated and the steel plate and coated had good adhesion properties. Source

Kong D.-W.,University of Science and Technology Beijing | Zhang J.-L.,University of Science and Technology Beijing | Pang Q.-H.,University of Science and Technology Beijing | Miao G.-Z.,Guofeng Iron and Steel Co Ltd | And 2 more authors.
Metalurgia International

Coke can be considered as a heterogeneous composite material comprising cahbogens, minerals as well as pores. Minerals have a great influence on the behavior of coke in blast furnace(BF). The source and combined forms of minerals in coke was elaborated. Four main reactions of mineral takes place in the coking process: 1 Transformation from low-temperature phase to high-temperature phase, 2 Decomposition and gasification, 3 Reduction of organic carbon, 4 Oxidation in the coke quenching process. Minerals in coke were classified into three groups namely agglomerate, coarse mineral in limited contact with organic carbon, disseminatd in close contact with organic carbon. and pore inclusions. Influence of mineral on coke gasification, coke-iron reaction, coke-slag reaction were analyzed. Mechanism of minerals formation and phase identification were obtained. Quantification of effect of different minerals on the behavior of coke in BF is the key point in further research. Source

Zhang C.-J.,Hebei United University | Sun X.-Y.,Guofeng Iron and Steel Co Ltd | Shi J.-P.,Hebei United University | Liu T.,Hebei United University | Zhu L.-G.,Hebei United University
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering

A rectangular continuous casting machine in a company is taken as the research subject. Combined with numerical simulation and physical simulation, the liquid steel flow behaviors and temperature distribution in the mold are systematically analyzed. The liquid steel flow field and heat flux distribution are calculated respectively at different outlet rake angles, immersion depths and casting speeds. The corresponding technological parameters are optimized as well. It is demonstrated that the best structure of submerged nozzle for 150 mm×330 mm rectangular cast bloom is the side opening for a runway shape with 30 mm inner diameter and 25° side opening angle. Source

Li H.,University of Science and Technology Beijing | Zhang J.,Guofeng Iron and Steel Co Ltd | Zhang Y.,University of Science and Technology Beijing | Zheng X.,University of Science and Technology Beijing | And 2 more authors.
Journal of Theoretical and Applied Information Technology

Work roll thermal contour is one of the important factors for roll contour design and configuration in hot strip rolling, for which the temperature field calculation is a critical factor. To realize the work roll thermal behavior for 1450mm hot strip mill, the temperature field and thermal contour calculation model was built with finite different methods, and the genetic algorithm was introduced to the model parameter optimization in order to improve the simulation precision. It was proved that the model can match the engineering precision requirement by the comparison between several calculated values and measured values of the work roll temperature. With the model, the work roll thermal contour variations in a rolling process, as well as the effect of rolling rhythm and shifting strategy on the work roll thermal contour were calculated. The results show that the work roll thermal crown varies relatively fast at the beginning of a rolling unit, and then tends to be stable. In the rolling process, the rolling rhythm shows great influence on the work roll thermal contour, while the shifting strategy shows little influence. © 2005 - 2012 JATIT & LLS. All rights reserved. Source

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