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Zhao Y.-Q.,Northeastern University China | Zhao Y.-Q.,Jinan Iron and Steel Group Co | Lan L.-Y.,Northeastern University China | Li C.-M.,Northeastern University China | And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2013

The alloy components of NM400 steel were determined by adding micro-V in Cr-B series wear resistant steel according to the low cost design ideas. Detailed research on different quenching temperatures and tempering temperatures shows the influence of different parameters on the microstructure and mechanical properties of the NM400 steel. The optimal parameters of heat treatment process are obtained, which are suitable for industrial production. Through the observation and analysis by optical microscope, SEM and TEM, the evolution law of fine structure in the lath martensite is obtained after tempering through different temperatures. The results show that the steel has high hardenability. The fine lath martensite which is distributed uniformly can be obtained after quenching at 900-930°C and tempering at 250°C for 90 minutes. The results analysed by TEM show that the lath martensite tempered is in width of 0.1-0.2μm and the fine carbides (mainly V(C, N) in size of 10-20nm) are distributed uniformly, which improve the comprehensive mechanical properties of the steel.

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.

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.

Xia D.,University of Science and Technology Beijing | Xia D.,Jinan Iron and Steel Group Co | 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;.

Li H.-F.,University of Science and Technology Beijing | Li H.-F.,Jinan Iron and Steel Group Co | Wen Y.-M.,Jinan Iron and Steel Group Co | Sun D.-M.,Jinan Iron and Steel Group Co
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.

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