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YIN S.-b.,Kunming University of Science and Technology | YIN S.-b.,Control Iron and Steel Research Institute, China | SUN X.-j.,Control Iron and Steel Research Institute, China | LIU Q.-y.,Control Iron and Steel Research Institute, China | ZHANG Z.-b.,Kunming Iron and Steel Co Ltd
Journal of Iron and Steel Research International | Year: 2010

The effect of deformation in the non-recrystallization region on the phase transformation for a low-carbon and high Nb-containing steel with coarse austenite grain size was investigated by means of dilatometric measurement and microstructure observation. The results show that with increasing the cooling rate, both the transformation start and finish temperatures measured by dilatometer are decreased, and the corresponding microstructure is transformed from ferrite and pearlite to full granular bainite gradually. The dynamic continuous cooling transformation diagram was plotted according to the dilatometric measurements and microstructure observations. Dilatometric measurements also show that the transformation start and finish temperatures of the test steel rise with increasing strain, strain rate and deformation temperature, and the reasons are discussed. © 2010 Central Iron and Steel Research Institute. Source


Yang S.-B.,Kunming Iron and Steel Co Ltd | Yang S.-B.,Control Iron and Steel Research Institute, China | Liu Z.-D.,Control Iron and Steel Research Institute, China | Cheng S.-C.,Control Iron and Steel Research Institute, China
Journal of Iron and Steel Research | Year: 2010

The important properties of some boiler steels such as T/P92, T/P122, S30432 (Super 304H), S31042 (HR3C) and NIMS-9Cr3W3Mo were critically reviewed. The creep rupture strength, corrosion resistance and conventional strength of these steels and their welding parts were carefully compared and isothermal curve method and Larson-Miller method were used to reasonably extrapolate creep rupture strengths of these steels after 105 h service. Meanwhile, allowable stress of these steel tubes and pipes and associated engineering concerns were also discussed. Source


Li H.-B.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology | Qi Y.-L.,Kunming University of Science and Technology | Hu J.-H.,Kunming University of Science and Technology | And 2 more authors.
Journal of Iron and Steel Research International | Year: 2011

Total ilmenite from Yunnan, China, difficult to smelt in blast furnace, was smelted by oxygen-enriched top-blown smelting reduction ironmaking technology. Much more details on smelting were discussed. Specifically, the influence of reduction temperature, slag basicity and molar ratio of carbon to oxygen on the reduction quality level including iron recovery and titanium and sulfur contents in the pig iron produced in the experiment was investigated. Iron recovery rate could reach 95% with titanium content below 0. 05% in pig iron produced, under the conditions of holding time of 30 min at 1 823 K, basicity of 1.1, carbon to oxygen molar ratio of 1. 0 and oxygen-enriched flow rate of 250 L/h. Oxidization potential of top-space of smelting reduction vessel and slag combination could create the driving force to partition phosphorous, titanium and silicon into the slag, which ensured low contents of the impurities involved above and carbon in pig iron. In addition, it avoided the generation of Ti(C, N) that could reduce interfacial tension of slag, which induced the formation of foaming slag seriously. Furthermore, jam of chargings and bubble flooding would be triggered, resulting in deterioration of BF state, increase of iron loss and decline of desulfurization rate. © 2011 Central Iron and Steel Research Institute. Source


Xie H.,Chongqing University | Bai C.-G.,Chongqing University | Lu X.-W.,Chongqing University | Wang T.,Kunming Iron and Steel Co Ltd | Zhou C.-Q.,Chongqing University
Kang T'ieh/Iron and Steel (Peking) | Year: 2010

According to its raw materials, orthogonal test scheme was designed and a large number of systemic experiments were carried out in order to study the sintering characteristics of three types of fine ores in Kunming Iron and Steel Co., Ltd. (KISC). Expressions of mineral mixture average particle size and sintering tumble strength were obtained by analyzing the experimental data. The effects of carbon mixture ratio and basicity on FeO of sintering ore, agglomeration ratio, tumble strength and utilize coefficient were researched via single factor analysis and range analysis. The best mixture ratio of each fine ore were obtained from the experimental results. Analysis found that the influence of the carbon mixture ratio is more significant than which of the basicity on the sintering process except agglomeration ratio of foreign ore. Source


Wang H.-T.,Kunming University of Science and Technology | Wang H.,Kunming University of Science and Technology | Zhang Z.-M.,Kunming Iron and Steel Co Ltd
Journal of Iron and Steel Research International | Year: 2012

Low temperature exhaust gases carrying large amount of waste heat are released by steel-making process and many other industries, Organic Rankine Cycles (ORCs) are proven to be the most promising technology to recover the low-temperature waste heat, thereby to get more financial benefits for these industries. The exergy analysis of ORC units driven by low-temperature exhaust gas waste heat and charged with dry and isentropic fluid was performed, and an intuitive approach with simple impressions was developed to calculate the performances of the ORC unit. Parameter optimization was conducted with turbine inlet temperature simplified as the variable and exergy efficiency or power output as the objective function by means of Penalty Function and Golden Section Searching algorithm based on the formulation of the optimization problem. The power generated by the optimized ORC unit can be nearly as twice as that generated by a non-optimized ORC unit. In addition, cycle parametric analysis was performed to examine the effects of thermodynamic parameters on the cycle performances such as thermal efficiency and exergy efficiency. It is proven that performance of ORC unit is mainly affected by the thermodynamic property of working fluid, the waste heat temperature, the pinch point temperature of the evaporator, the specific heat capacity of the heat carrier and the turbine inlet temperature under a given environment temperature. © 2012 Central Iron and Steel Research Institute. Source

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