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Gao Z.,University of Science and Technology Beijing | Dai J.,University of Science and Technology Beijing | Zhang J.,University of Science and Technology Beijing | Luan J.,Jinan Iron and Steel Group Co. | And 3 more authors.
AISTech - Iron and Steel Technology Conference Proceedings | Year: 2015

On line laser detector for burden surface profile measurement has been used at 3# BF (1750m3) of Jinan Iron & Steel Co. and 8# BF (3200m3) of Handan Iron & Steel Co. Laser beams are used to scan the furnace burden and images of the burden surface taken by special camera can be obtained in real-time. With this technology, burden surface profile curves can be also obtained, so BF burden distribution can be well understood. With this real time burden surface profile, the on-line BF Burden Distribution Computer Simulation Model has been developed. It is very beneficial to improve furnace operation with better technical and economical indexes. AISTech 2015 Proceedings © 2015 by AIST.


Zheng X.-F.,University of Science and Technology Beijing | Kang Y.-L.,University of Science and Technology Beijing | Meng D.-L.,University of Science and Technology Beijing | An S.-Y.,Jinan Iron and Steel Group Co | Xia D.-X.,Jinan Iron and Steel Group Co
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2011

The finish rolling temperature was determined at 830, 800 and 775°C to investigate its effect on the microstructure and mechanical properties of high deformability pipeline steel. The grain size and volume fraction of ferrite and M/A islands in the steels were measured by metallographic microscopy and image processing software. Electron backscatter diffraction (EBSD) analysis was conducted to ascertain the effective grain size and the volume fraction of high angle grain boundaries. The M/A island forms were observed by transmission electron microscopy (TEM). A quasi-static tensile testing machine was used to test the yield strength, tensile strength and uniform elongation of the three steels. It is indicated that when the finish rolling temperature is 800°C, the steel has the best mechanical properties and can meet the requirements of X80 high deformability pipeline steel.


Li G.,Jinan Iron and Steel Group Co. | Tian S.,Jinan Iron and Steel Group Co. | Wang Y.,Jinan Iron and Steel Group Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2012

Effect of Cr on microstructure and mechanical properties of the low carbon alloy steel containing Cr was investigated under different holding time tempered at 650°C after quenching at 950°C and compared with that of the steel with similar chemical composition without adding Cr. The results show the mechanical properties of the steel containing Cr are lower than that of the steel without Cr when the tempering time calculated by 2.5 min/mm. Cr can improve the hardenability of the steel obviously, as a result, the center of steel can obtain bainite structure preparing for tempering, but Cr can form carbide as M 7C 3or M 23C 7 in tempering process. These carbides are unstable and easily coarsening, their strip shapes destroy the continuity of steel, which resulting the decrease of strength and toughness. Precipitation behavior of carbides in the steel containing Cr was investigated under different tempering time. Carbides in the steel containing Cr is not observed when temper holding time calculated by 1 min/mm, however, they precipitate and grow up quickly with the increase of holding time, and the size of carbides grows up to 300 nm when holding time calculated by 3 min/mm. So a suitable quenching and tempering process should be adopted for the low carbon alloy steel containing Cr through controlling the tempering time in order to restrain aggregation and growth of carbides and prevent the decrease of strength and toughness after tempering.


Hou Z.,Northeastern University China | Xu Y.,Northeastern University China | Wu D.,Northeastern University China | Sun W.,Jinan Iron and Steel Group Company | And 2 more authors.
Materials Science Forum | Year: 2011

Good combination of high strength and high toughness has been considered as a critical factor of ultra-high strength steel plates. In this paper, a novel high strength steel plate of HSLA type containing Cu with 910MPa yield strength and 1163MPa tensile strength has been developed using an advanced TMCP (thermo-mechanical control processing) technology. The steel plates provide excellent combination of high strength, toughness and deformability. Microstructural evolution and mechanical properties of this steel during hot-working have been investigated. It is demonstrated that, at the relatively higher finish rolling temperature and cooling rate, the microstructure consists of acicular and granular bainite structures and a small amount of low bainite /martensite whose lath width is approximately 200∼300nm. For the as-rolled conditions, despite the high strength and so low yield ratio, impact energy about 154J and fully ductility fracture at -90°C can still be obtained as documented for as-hot rolled plates. © (2011) Trans Tech Publications.


Bai Y.-L.,Pangang Group Co. | You D.-Y.,Pangang Group Co. | Lu G.-Q.,Pangang Group Co. | Liu C.-X.,Jinan Iron and Steel Group Co.
Applied Mechanics and Materials | Year: 2012

Stress-strain is commonly used in engineering; however the real stress-strain is more used in the test and exploitation of new product. ANSYS finite element software is adopted in this study, stress-strain of the tensile sample of the sheet in different stage is calculated under the 10mm displacement load, stress-strain curve is obtained, and the engineering and the real stress-strain are analyzed. The results show that simulation data are in accordance with the measured ones, the error is less than 3%, which proves that the model is the rational.


Li H.,CAS Institute of Process Engineering | Li H.,University of Science and Technology Beijing | Li H.,Jinan Iron and Steel Group Ltd. | Bao W.,CAS Institute of Process Engineering | Cang D.,University of Science and Technology Beijing
Science China Technological Sciences | Year: 2010

The typical features for an integrated iron & steelmaking industry are high energy consumption and CO2 emission. The traditional BF-BOF process in an integrated Iron and steelmaking enterprise produces a large amount of residual heat and energy, which has great potential for recovery and abatement potential of CO2 emissions. In this paper, for an integrated Iron & steelmaking enterprise of 10 million tons per year in capacity, the residual heat and energy recovery analysis was conducted. It is indicateded that the residual heat and energy can be recovered as electric power by using present advanced process technology. By means of the distributed power generation, the residual heat and energy can be recovered, with a power generation capacity of 419.5 kWh per ton steel product. Accordingly, the abatement potential of CO2 emissions for an integrated iron & steel-making enterprise was also evaluated, which indicated that about 398.5 kg CO2 could be reduced per ton steel product. © 2010 Science in China Press and Springer Berlin Heidelberg.


Li H.-F.,University of Science and Technology Beijing | Li H.-F.,Jinan Iron and Steel Group Ltd. | Wen Y.-M.,Jinan Iron and Steel Group Ltd. | Sun D.-M.,Jinan Iron and Steel Group Ltd.
Kang T'ieh/Iron and Steel (Peking) | Year: 2010

Owing to the typical BF-BOF process in an integrated iron and steel enterprise, it produces large plenty of residual heat and energy, which has great potential for recovery. The energy flow as well as the recoverable residual heat and energy resource in a typical iron and steel manufacture process, had been systematically analyzed. It suggests that the residual heat and energy can be recovered as electric power by using present advanced process technology. By building the distributed power generation, the residual heat and energy can be recovered, transported, and reused as close as possible, and so as to make the electric power self-support in iron and steel enterprise. Based on an integrated steel plant of 10 million tons per year in capacity, the residual heat and energy can be recovered by distributed generation system, and the power generation capacity can reach to 4195000 MW · h with the average of 419.5 kW · h per ton steel. It can be concluded that the electric power self-support or even outer supply in iron and steel enterprise can be completely realized through the residual heat and energy recovered by distributed power generation.


Liu G.-M.,Taiyuan University of Science and Technology | Di H.-S.,Northeastern University China | Zhou C.-L.,Taiyuan University of Science and Technology | Li H.-C.,Jinan Iron and Steel Group Co Ltd | Liu J.,Jinan Iron and Steel Group Co Ltd
Journal of Iron and Steel Research International | Year: 2012

In order to lucubrate the rolling characteristic of the two stands reversible cold rolling mill and establish the tension and thickness control strategy, the steady-state characteristic simulating program was established using the steady-state continuous rolling theory. The influences of each factor on exit thickness under different tension control methods were analyzed. The results show that, the influence of the entry stand gap on exit thickness is significant and it changes little with different tension control methods. As a result, the entry stand gap can be used as the main control method of exit thickness, whereas rolling speed of any stand and roll gap of the exit stand can be used to adjust the inter-stand tension. The results are beneficial for thickness and tension control of the two stands reversible cold rolling mill. © 2012 Central Iron and Steel Research Institute.


Xue S.-H.,China Jiliang University | Li W.-J.,China Jiliang University | Li F.-H.,Jinan Iron and Steel Group Co. | Tian Y.-N.,Jinan Iron and Steel Group Co.
Jiliang Xuebao/Acta Metrologica Sinica | Year: 2010

Three techniques are chosen to measure the temperature of a slab by sweeping view point with a high-pressure air, viewing its edge and bottom. A calibration technique is applied to modulate the emissivity setting of the infrared thermometers with a thermocouple. The results show that the spectral emissivity at the vicinity of 1um is approximately 0.84 and the full-wavelength emissivity is about 0.85 of a steel slab with a heavily oxidized skin. If an infrared thermometer with a working wavelength of 1um and an emissivity setting between 0.81 to 0.87 and a total radiation infrared thermometer with an emissivity setting between 0.83 to 0.87, the deviations of temperature from fluctuations of emissivities for a steel target at 1000°C are less than 4°C and 7.5°C.


Xia D.,University of Science and Technology Beijing | Xia D.,Jinan Iron and Steel Group Company | Wang X.,University of Science and Technology Beijing | Wang X.,Control Iron and Steel Research Institute, China | And 3 more authors.
Jinshu Xuebao/Acta Metallurgica Sinica | Year: 2013

The mechanical properties and microstructure of the TG (third generation) X90 pipeline steels which have been industrially trial-produced were investigated. The results showed that the microstructure of the 18.4 mm thick X90 pipeline steels consist of quasi-polygonal ferrite, lath bainite and M/A (martenite/austenite) island. The yield strength was between 615 and 660 MPa, and the tensile strength was above 720 MPa, and the yield ratio was below 0.9, the impact absorbed energy at -30°C was over 200 J, and the shearing area of drop-weight tear test (DWTT) at -15°C was more than 80%. The ratio of the soft phase (quasi-polygonal ferrite) and the hard phase (lath bainite) was about 3:2, and the dislocation density in the lath bainite was higher, while that in the quasi-polygonal ferrite was lower. The EBSD results showed that the lath of the hard phase met the shear transformation characteristics, indicating that the effect of microstructure control on hard and soft phase has been achieved. © Copyright;.

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