State Key Laboratory of Advanced Metallurgy

Beijing, China

State Key Laboratory of Advanced Metallurgy

Beijing, China
SEARCH FILTERS
Time filter
Source Type

Yao D.,State Key Laboratory of Advanced Metallurgy | Yao D.,University of Science and Technology Beijing | Li J.,State Key Laboratory of Advanced Metallurgy | Li J.,University of Science and Technology Beijing | Li J.,Yangjiang Shibazi Group
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

Microstructure, carbides and mechanical properties of 7Cr17MoV stainless steel used as cutlery material produced by hot rolling and cold rolling were studied. The experimental results demonstrate that the microstructure of the rolled steel consists of spheroidal pearlite and carbides. During hot rolling process, the carbides will aggregate obviously and the size of carbides is almost above 2 μm. Then after cold rolling, the aggregation of carbides disappear, and the carbides become fine and uniformly distributed, at the same time, there are some nanoscale carbides. During cold rolling process, the vanadium carbides and molybdenum carbides will decrease and disappear and the carbides mainly consist of (Fe, Cr)23C6. Tensile strength of the cold rolled thin strip (0.7 mm) is about 690 MPa. The dimples and the second phase particles can be easily seen in the tensile fracture, and the second phase particles are identified to be mainly carbides and inclusions.


Dai W.B.,State Key Laboratory of Advanced Metallurgy | Li Y.,State Key Laboratory of Advanced Metallurgy | Zhou Y.Y.,State Key Laboratory of Advanced Metallurgy | Cang D.Q.,State Key Laboratory of Advanced Metallurgy | Fan Y.,Tohoku University
Advanced Materials Research | Year: 2014

Directly recycling residual iron element in modified BOF slag after reduction and manufacturing glass-ceramics from these remaining inorganic slag materials is an effective way to reuse the waste heat and slag materials of hot BOF slag. In the glass-ceramics, the Al2O3 has an important influence on the slag viscosity and the physical and chemical properties of glass-ceramics. In this paper, glass-ceramics with a basicity of 0.7 and a MgO content of 9~12% were prepared by using chemically pure reagents according to the CaO-SiO2-MgO phase diagram, and the effect of different Al2O3 content on the parent glass crystallization and glass-ceramic performances was studied. Results show that the flexural strength of glass-ceramics is mainly affected by the sintering shrinkage. When the weight content of Al2O3 exceeds 15%, both the flexural strength and the shrinkage rate reached the maximum, and dense microstructure was obtained. In addition, the original dominant crystal structure is affected while Al2O3>12%, with the anorthite crystal phase appearing consequently. © (2014) Trans Tech Publications, Switzerland.


Zuo Q.-W.,University of Science and Technology Beijing | Zuo Q.-W.,State Key Laboratory of Advanced Metallurgy | An X.,Tangshan Iron and Steel Co. | Yang J.-B.,Tangshan Iron and Steel Co. | And 2 more authors.
Advanced Materials Research | Year: 2014

In order to improve the quality of the billets, the whole test proceedings by the comparison of the two casting conditions which one is over heat 20°C-30°C under casting speed 0.4m/min-0.6m/min and the other is over heat 10°C -15 °C under casting speed 1.3m/min-1.6m/min are checked during the produce process of GCr15 in some domestic steel-making plant. The results show that the average grade of general porosity decreases 1.0, the average grade of center porosity down 0.5, the average grade of center segregation fall 0.5 and the samples tested in hot upset forging perform better than before. According to the results, the latter is determined to be accepted. © (2014) Trans Tech Publications, Switzerland.


Zuo Q.-W.,Beijing University of Technology | Zuo Q.-W.,State Key Laboratory of Advanced Metallurgy | Cang D.-Q.,Beijing University of Technology | Cang D.-Q.,State Key Laboratory of Advanced Metallurgy | An X.,Tangshan Iron and Steel Co.
Open Fuels and Energy Science Journal | Year: 2015

The combustion characteristics of pulverized coal when using blast furnace slag charged with iron ore containing rare earth elements as a composite catalyst were investigated by thermo gravimetric analysis. The results show that the combustion char acteristics of pulverized coal loaded with 21.3% by weight of blast furnace slag containing 15% rare earth ore are better than those of others. It is also indicated that the composite catalyst promotes combustion of volatiles and also performs well for carbon residue. The mechanism of promotion by the composite catalyst was explored. The kinetic parameters calculated by the Coats-Redfern model show that the activation energy(E) was reduced by10 kJ/mol, the time of combustion was shortened by 3min, pre-exponential factor(A) reached 2.7×104/min and general combustion characteristic index (S)was 1.09. © Zuo et al.; Licensee Bentham Open.


Liu Q.,State Key Laboratory of Advanced Metallurgy | Liu Q.,University of Science and Technology Beijing | Wang Z.,State Key Laboratory of Advanced Metallurgy | Wang Z.,University of Science and Technology Beijing | And 4 more authors.
Kang T'ieh/Iron and Steel | Year: 2013

As the key procedure during steelmaking process, the production in steelmaking plant involving four processes: hot metal pretreatment, steelmaking, secondary refining and continuous casting. Such as steelmaking process, the fine production in steel manufacturing process was described. Fine production for steelmaking process is elaborated from the fine control of productive technology, the fine configuration and operation of process facilities, the fine control of production process. Meanwhile, recent research progress concerning fine production for steelmaking process was reviewed. Fine production for steelmaking process was of great importance to the high quality, high efficiency, low cost, and energy saving production in steel manufacturing process.


Liu Y.,University of Science and Technology Beijing | Liu Y.,State Key Laboratory of Advanced Metallurgy | Zhang Y.-L.,University of Science and Technology Beijing | Zhang Y.-L.,State Key Laboratory of Advanced Metallurgy | And 2 more authors.
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2014

The morphology of the reduction products of Fe-Cr-O systems by C at different temperatures and time intervals was studied in this paper. The samples include two systems of FeCr2O4+C and Fe2O3+2Cr2O3+C. It is found that the reduction degrees of the two samples increase with increasing temperature, and the reduction degree can be above 90% when the reaction is close to balance. The reduction processes of FeCr2O4 and Fe2O3-Cr2O3 are similar and the final reduction products are composed of Fe-Cr-C alloys and metal carbides (mainly Cr7C3). A method was proposed to estimate the contents of Fe-Cr-C alloys and metal carbides in the final reduction products, and the estimated results agree with the calculated data. It is shown that the content of Fe-Cr-C alloys increases while the content of metal carbides decreases with increasing temperature, and the composition of Fe-Cr-C alloys varies with temperature.


Shan K.,State Key Laboratory of Advanced Metallurgy | Shan K.,University of Science and Technology Beijing | Guo X.-M.,State Key Laboratory of Advanced Metallurgy | Guo X.-M.,University of Science and Technology Beijing
Materials Letters | Year: 2014

A single phase perovskite, YxSr1-xTi 0.6Fe0.4O3-δ (x=0.07, 0.08, 0.09), was synthesized at 1350 C by the sol-gel method. The effects of Y-doping on the electronic and ionic conductivities of YxSr1-xTi 0.6Fe0.4O3-δ were investigated. The ionic conductivity of SrTiO3-based materials can be significantly improved by Y-doping on the A-site and Fe-doping on the B-site. We report in this paper a remarkable enhancement of ionic conductivity of Y, Fe co-doped SrTiO 3 by the increase in Y-doping amount on the A-site. The total electrical conductivity and ionic conductivity were 0.135 S/cm and 0.017 S/cm for Y0.07Sr0.93Ti0.6Fe0.4O 3-δ at 800 C, respectively, while were 0.056 S/cm and 0.02 S/cm for Y0.09Sr0.91Ti0.6Fe0.4O 3-δ. © 2014 Elsevier B.V.


Zhi X.,University of Science and Technology Beijing | Guo Z.C.,State Key Laboratory of Advanced Metallurgy
Applied Mechanics and Materials | Year: 2013

This research through the study on the properties of silicon dust, put forward in combination with lime kiln tail gas recycling carbon dioxide, preparation of precipitated silica (Nano White Carbon Black) of high value utilization technology, and studied and summarized process of the dissolution and precipitation by carbon dioxide. The silica fume is in amorphous form, and it has some special powder properties such as ultra fine grain size and high specific surface area and high chemical activity, these provide favorable foundation for low energy consumption process of recycling the powder. In the dissolution stage, the optimization reaction time is about 40 minutes, this time to complete the process of the reaction more than 90%. And the reaction is the fastest in the first 20 minutes, complete response 75% of the reaction. In the stage of carbonization, with increase of the concentration of the precursor, the particle diameter becomes larger, but the specific surface area of the powder will reduce, the porosity and the surface activity of it will reduce corresponding. © (2013) Trans Tech Publications, Switzerland.


Li Y.-L.,University of Science and Technology Beijing | Li Y.-L.,Beijing Key Laboratory of Green Recycling and Extraction of Metal GREM | Li Y.-L.,State Key Laboratory of Advanced Metallurgy | Cheng S.-S.,University of Science and Technology Beijing | And 2 more authors.
Kang T'ieh/Iron and Steel | Year: 2014

The mathematical models of blast furnace (BF) hearth were established and the masonry structures of large carbon blocks and small carbon bricks for hearth were discussed from the view of heat transfer. The temperature of these two hearth structures during BF drying process were calculated as well as after blow-in. It is found that the filling between staves and carbon bricks can not be dried effectively at present BF drying conditions and the thermal conductivity of filling can not reach the designed value. Moreover, with the existing of filling, the hot face temperature of lining is higher which results in more serious erosion. Therefore, the filling should be cancelled between staves and carbon bricks. It has obvious advantage of heat transfer for carbon bricks touching with staves directly. The hearth structure of small carbon bricks could be designed to touch with staves directly so that it exterminates the barriers on heat transfer of hearth. The hearth structure of large carbon blocks should be put some small carbon bricks touch with staves directly and then make the filling between the small carbon bricks and large carbon blocks. The filling moves towards center of BF more than about 200 mm. In order to dry filling completely during BF drying process, the necessary method is without utilizing cooling water. Meanwhile, some measures are discussed for keep staves safe.


Liu H.T.,State Key Laboratory of Advanced Metallurgy | Liu H.T.,University of Science and Technology Beijing | Chen W.Q.,State Key Laboratory of Advanced Metallurgy | Chen W.Q.,University of Science and Technology Beijing
Ironmaking and Steelmaking | Year: 2014

The recovery of low melting point metal bismuth in eco-friendly Bi-S based free cutting steel with different addition methods was studied in laboratory. Maximum recovery was achieved using metal Bi with Bi2O3 second, and Bi2S3 the worst. Furthermore, the recovery could be further improved significantly by mixing the metal Bi with Fe power in a specific ratio. The recovery was increased with decreasing temperature when the temperature was above 1560uC, and achieved its maximum near the boiling point of bismuth. The loss of bismuth in the molten steel mainly occurred in the first 3 min after the bismuth addition because of the high local concentration and the large local vapour pressure of bismuth in the molten steel, especially in the first minute, but the loss decreased gradually later. Covering the surface of the molten steel with a slag layer of sufficient thickness effectively reduced the evaporation loss of bismuth after 3 min. © 2014 Institute of Materials.

Loading State Key Laboratory of Advanced Metallurgy collaborators
Loading State Key Laboratory of Advanced Metallurgy collaborators