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Jiayuguan, China

Di Z.-G.,Jiuquan Iron and Steel Co. | Huang M.,Control Iron and Steel Research Institute, China
Journal of Iron and Steel Research | Year: 2012

In order to decrease the production costs of Inconel 718 alloy, two kinds of test programs were designed including conventional program and economical program. The conventional program was designed to smelt Inconel 718 alloy with elemental metal. The economical program was designed to smelt Inconel 718 alloy with Nb-Fe and Cr-Fe instead of metal Nb and Cr. Two heats of 718 alloy were smelted separately by two kinds of test programs in vacuum induction furnace, molten alloy were casted to two ingots. Under the same processing parameter, two ingots were carried out diffusion annealing, roll forming and heat treatment. Specimens were taken to analyze the mechanical properties and metallurgical structure. The testing results show Inconel 718 alloy by both kinds of test programs can reach domestic technical standard of superior alloy. Compared with conventional program, economical program of using Nb-Fe and Cr-Fe instead of metal Nb and Cr can decrease 18% costs of the raw material.

Zhao F.,Lanzhou Jiaotong University | Wang Q.,Lanzhou Jiaotong University | He J.,Jiuquan Iron and Steel Co.
Lecture Notes in Electrical Engineering | Year: 2013

According to the present operation of UPS in electric railway, sum up the three key problems existing in its application as follows. First, UPS performing a self-test automatically is unable to absolutely detect the failure battery. Second, in electrified railway, UPS battery keeps in the floating charge state for a long time, which reduces battery lifetime. Third, discharge time of battery is determined on the basis of battery capacity. The accurate measurement of battery capacity is getting more and more important to avoid deep discharge. However, with complex chemical properties of battery, to achieve accurate measurement of battery capacity is impossible at present. So, to solve the three problems above, an experiment has been conducted and a system has been designed on the basis of experimental data. © 2013 Springer-Verlag.

Chang C.-M.,Jiuquan Iron and Steel Co. | Chen L.-Z.,Jiuquan Iron and Steel Co.
Journal of Iron and Steel Research | Year: 2012

The defects of transverse coating ripple and longitude coating ripple on the hot-dip galvalume coating produced by thin slab continous casting-rolling process were analyzed by using OM and SEM-EDS. Comprehensively, air knife-pressure, gap of air knife, angle of air knife, the temperature of zinc liquid, the temperature of steel strip in zinc pot are the main reasons of coating ripple on the galvalume coating. Longitude coating ripple is caused by lower air knife pressure and higher temperature of zinc liquid. Higher air knife pressure and wider gap of air knife lead to transverse coating ripple. The homogeneity coating thickness, spangles and shine can be achieved by means of controlling the process parameters to ensure the shake of strip steel under 3 mm at certain temperatre.

Liu Z.-L.,Anhui University of Technology | Yan W.-F.,Anhui University of Technology | Qu F.-Q.,Jiuquan Iron and Steel Co. | Zhou H.-M.,Shandong Huimin Science and Technology Co. | And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2013

The high radiative coating technology was used in the coke oven 5 in Jiuquan Steel Co., The comparison test were conducted under different conditions in between the coke oven with and without coating. The results show that the heat transfer efficiency was increased 6.35% in coke oven 5, and the central temperature of coke cake increases 14°C, the flue gas temperature decreases 23°C and saves coke oven gas 420.48 × 104 m3/a and the energy saving rate is 3.32%. The effective thermal efficiency of coke oven is increased 1.99%. The energy consumption for the coking process decreases 81.8kJ/kg coal(with 7%H2O), and CO2 emissions reduces 132.5 × 104 m3/a. Obvious economic and social benefits can be obtained.

Fu B.-H.,University of Science and Technology Beijing | Hou H.-B.,University of Science and Technology Beijing | Cheng G.-G.,University of Science and Technology Beijing | Pan J.-X.,Jiuquan Iron and Steel Co. | And 2 more authors.
Kang T'ieh/Iron and Steel (Peking) | Year: 2011

The inclusions in the steel samples taken at different stages of AOD-LF-CC process during 409 L stainless steelmaking and casting were observed by a scanning electron microscope with an EDS X-ray analyzer. The types of inclusions from different stages of the process were analyzed and identified. The inclusions in AOD were mainly CaO-SiO 2-Al 2O 3-MgO compounds, while in LF, it was detected mainly MgO-Al 2O 3-TiO x inclusions. Both MgO-Al 2O 3-TiO x and TiN inclusions were found in tundish. The origin of the inclusions formed at different stages was also discussed.

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