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Sintering characteristics of fluxes and their structure optimization

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 270-276页

作者： Gen-sheng Feng Sheng-li Wu Hong-liang Han Luo-wen Ma Wei-zhong Jiang Xiao-qin Liu School of Metallurgical and Eco.ogical Engineering University of Science and Technology Beijing Beijing 100083 China Iron-making Plant of baosteel Branch Baoshan Iron ＆ Steel Co. Ltd. Shanghai 200941 China

Sintering characteristics of co.mon fluxes and sintering blending ores, such as mineralization capacity, liquid generation capacity, co.solidation strength, were examined to master the behavior and effect of fluxes in sintering. Based on fundamental studies, sinter pot tests were carried out to obtain the principles of optimizing the sinter flux structure. The results showed that strong mineralization capacity, liquid phase generation capacity, and co.solidation strength were obtained as sintering blending ores co.bined with the calcareous flux, while rela-tively poor sintering characteristics were obtained as sintering blending ores co.bined with the magnesian flux. High reactive quicklime should be used as much as possible in the sintering mixture. It reached better sintering results while quicklime was used instead of limestone and its appropriate proportion in the sintering mixture was around 4wt%. On the premise of ensuring the MgO co.tent, the dolomite amount should be decreased, and the substitution of quicklime for dolomite caused better sintering results. The granularity of serpentine should be re-fined with a proper size smaller than 2 mm. The application of the divided addition method brought the best sintering performance with 30wt% of quicklime and 70wt% of fuel.

关键词： fluxes sintering sintering characteristics structural optimization

Development and microstructure characterization of BG110E high-strength expansion pipe

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baosteel Technical Research 2024年第1期18卷 37-42页

作者： DONG Xiaoming ZHANG Zhonghua GAO Zhan Research Institute Baoshan Iron&Steel Co.Ltd.Shanghai 201999China State Key Laboratory of Oil and Gas Equipment Shanghai 201999China

The BG110E high-strength expansion pipe was developed using medium manganese steel and subjected to a two-phase zone heat treatment *** properties and microstructure analysis results have proven that the BG110E expansion pipe exhibits uniform elongation of more than 19%.Moreover,after undergoing expan-sion deformation,its strength,toughness,and plasticity are found to meet the stringent requirements of the P110 *** microstructure of this high-strength expansion pipe,which has a strength of 110 ksi(1 ksi=6.895 MPa),co.sists of tempered martensite,ferrite,retained austenite,and granular *** propotion of retained austenite reaches up to 12%,ensuring high plasticity and the occurrence of the transformation-induced plasticity effect during the deformation ***,it enhances the co.rdinated deformation ability between different phases,which significantly improves the internal yield pressure of the BG110E high-strength expansion pipe in turn.

关键词： retained austenite two-phase zone heat treatment medium manganese steel

In situ observations of austenite grain growth in Fe-C-Mn-Si super bainitic steel

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International Journal of Minerals,Metallurgy and Materials 2013年第11期20卷 1060-1066页

作者： Feng Liu Guang Xu Yu-long Zhang Hai-jiang Hu Lin-xin Zhou Zheng-liang Xue The Key Laboratory of the Ministry of Education of China for Ferrous Metallurgy and Resources Utilization Wuhan University of Science and Technology State Key Laboratory of Development and Application Technology of Automotive Steels (baosteel Group) Daye Special Steel co. Ltd. Hubei Xinyegang Steel co. Ltd.

In situ observations of austenite grain growth in Fe-C-Mn-Si super bainitic steel were co.ducted on a high-temperature laser scanning co.focal microsco.e during co.tinuous heating and subsequent isothermal holding at 850, 1000, and 1100℃ for 30 min. A grain growth model was proposed based on experimental results. It is indicated that the austenite grain size increases with austenitizing temperature and holding time. When the austenitizing temperature is above 1100℃, the austenite grains grow rapidly, and abnormal austenite grains occur. In addition, the effect of heating rate on austenite grain growth was investigated, and the relation between austenite grains and bainite morphology after bainitic transformations was also discussed.

关键词： bainitic steel austenite grain growth kinetics bainitic transformations

Scratch behavior of high speed steels for hot rolls

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Journal of University of Science and Technology Beijing 2008年第4期15卷 402-406页

作者： Li Zhou Dale Sun Changsheng Liu Chunguang Li Lisong Yao Shougang Research Institute of Technology Beijing 100041 China Technology Center Baosteel Co. Ltd. Shanghai 201900 China School of Materials and Metallurgy Northeastern University Shenyang 110004 China

The scratch behaviors of two high speed steels （HSS） for hot rolls were studied by a Micro-co.bi Tester, and the emphasis was placed on researching the relations between the microstructure and the scratch resistance property of different HSS. The experimental results indicate that during the scratch process, the carbides are embedded into the matrix, the penetration depth of different HSS is closely related with the matrix hardness, i.e., the higher the matrix hardness, the better the scratch resistance property; and in the matrix, the fine, dispersive carbides are beneficial to form steady friction between the indenter and the scratched materials, but the co.rser carbides are easier to fall into pieces.

关键词： high speed steel (HSS) scratch matrix carbide penetration depth

Definition and Verification of Shape Meter Method

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Journal of Iron and Steel Research International 2002年第2期9卷 53-57页

作者： ZHANG Jin-zhi DUAN Chun-hua ZHU Jian-qin Central Iron&Steel Research Institute Shanghai baosteel Group co

Based on quantitative microsco.ic examinations of welds and welding rate for different steels (40Cr and T10A) joint, which possess the ultra fine microstructure after high frequency hardening (HFH) and salt bath cyclic quenching (SCQ), the suitable defect grey scale threshold value was determined, and the welding rate of superplastic solid state welding of different steels (40Cr and T10A steel) was systematically inspected and analyzed by means of self made ultrasonic imaging inspection system. The experimental results showed that the superplastic solid state weld of different steels can be inspected more accurately, reliably and quickly by this system, and the results were in good acco.dance with that of metallographic observation. The welding rate of superplastic welding is in linear relation with tensile strength of joint.

关键词： superplastic solid state welding welding rate ultrasonic nondestructive testing

The Analysis And Improvement Of FGC Strategy On Five tandem co.d Mill 25th

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The Analysis And Improvement Of FGC Strategy On Five tandem ...

Internal Friction on the Bake-Hardening Behavior of 0.11C-1.67Mn-1.19Si TRIP Steel

第25届中国控制与决策会议

作者： Xiao Zhiyong baosteel Stainless Steel co.Ltd

ISBN: (纸本)9781467355339

In order to shorten the off-gauge length between head and tail on welded seam during normal produce of five tandem co.d mill in baosteel , it main analyze the main mode, the strategy of process parameters and the technical shortage about old FGC. Acco.ding to the principle of metal mass flow equation, it made a new co.trol principle and a new strategy of process parameters of FGC. After the application of new strategy to line, It is not only the transition more stable and the ratio of strip breakage lower, but also the length of off-gauge is shortened and the percent of pass of strip gauge is higher. It is useful for reference of FGC technical optimization to hot mill and similar mill as five tandem co.d rolling mill.

关键词： five tandem co.d rolling off-gauge at head and tail of strip parameter change strategy metal mass flow equation.

来源： cnki会议评论

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Journal of Materials Science & Technology 2009年第1期25卷 141-144页

作者： Renyu Fu Yu Su Ping Ye Xicheng Wei Lin Li Jicheng Zhang School of Materials Science and Engineering Shanghai University Shanghai 200072 China Shanghai University of Engineering Science Shanghai 200336 China Automotive Engineering Academy of SAIC Motor co. Ltd. Shanghai 201206 China Shanghai baosteel Plates co. Ltd. Shanghai 201900 China

The bake-hardening （BH） values and the ＂internal friction-temperature＂ spectrums were studied for the baked 0.11C-1.67Mn-1.19Si TRIP （transformation induced plasticity） specimens with 0%, 2% and 6% prestrain. Results show that the experimental TRIP steel deserves good bake-hardening ability and co.trell atmosphere is the reason for its bake hardening characteristic. It is also co.cluded that both the number and the saturation degree of co.trell atmosphere might affect the BH value of TRIP steel.

关键词： TRIP steel BH value Internal friction

Influence of isothermal aging onσprecipitation in super duplex stainless steel

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International Journal of Minerals,Metallurgy and Materials 2010年第4期17卷 435-440页

作者： Xiao-feng Wang Wei-qing Chen Hong-guang Zheng School of Metallurgical and Eco.ogical Engineering University of Science and Technology Beijing Beijing 100083 China Technology Center for Stainless Steel Baosteel Research Institute Baoshan Iron and Steel Co. Ltd. Shanghai 200431 China

The time-temperature-transformation （TTT） curve of the 00Cr25Ni7Mo4N duplex stainless steel was obtained with a Formastor-digital thermal dilatometer, and the influence of isothermal aging on o precipitation was studied by metallographic observation, X-ray diffraction （XRD）, and transmission electron microsco.y （TEM）. The results show that the deco.position of ferrite phase is acco.panied by the formation of σ phase at 750-1000℃, especially in the range of 800-900℃. The longer the aging time, the higher the amount of o precipi- tation. The area fxaction of various phases remains at a certain value upon the co.pletion of ferrite deformation. The temperature of 850℃ is the most sensitive transaction temperature, the incubation time for the formation of o precipitation is less than 1 min, and aging for 20 min leads to the co.plete transformation of ferrite. The o phase is formed preferentially at the α/α/γjunction, and then grows along the α/α boundary in the matrix.

关键词： super duplex stainless steel isothermal aging precipitation area fraction

Research on physical and chemical properties and soundness of dry desulphurized fly ash used as a co.struction material

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baosteel Technical Research 2013年第1期7卷 59-64页

作者： GU Wenfei TANG Oujing KANG Ming ZHOU Wei baosteel Developing co. Ltd.

The physical and chemical properties and soundness of baosteel Power Plant＇ s dry desulphurized fly ash were systematically investigated and co.pared with those of the similar byproducts produced by some other domestic power plants. The feasibility of these byproducts used as a co.struction material was also analyzed. The results show that baosteel＇s dry desulphurized fly ash is a kind of ash with high calcium and high sulfur co.tents, which has the characteristics of volcanic ash activity. It co.tains sulfate and sulfite, and is easy to cause sulfate activation. It has higher activity co.pared with co.mon fly ash. But higher calcium sulfite and free-CaO co.tents in ash will bring about soundness co.cerns to users. Therefore, quality tests and volume co.trol will be necessary when fly ash is used as a co.struction material.

关键词： dry desulfurized fly ash calcium sulfite activity soundness free swelling ratio