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Development of 340MPa Grade Galvanized Automotive HSLA Sheet of shougang

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Journal of Iron and Steel research International 2011年第S1期18卷 990-993页

作者： QI Chun-yu 1,LIN Li-bin 2,ZHOU Jian 2,LIU Guang-ming 2,YIN Xian-dong 1 (1.beijing shougang Cold Rolling Company,Ltd.,beijing 101304,china 2.shougang research institute of technology,beijing 100041,china) beijing shougang Cold Rolling Co Ltd Beijing 101304 Peoples R China shougang Res Inst Technol Beijing 100041 Peoples R China

In the paper,development of 340MPa galvanized grade HSLA sheet of shougang is *** effects of annealing parameters on the precipitates,microstructures and mechanical properties were *** to the experiment,it was indicated that the fine microstructures and disperse carbide of Nb caused high strength of the *** now,the product has been used to the reinforced inner panel.

关键词： HSLA microstructure property precipitation galvanizing

Thermal , Microstructural and Mechanical Coupling Analysis Model for Flatness Change Prediction During Run-Out Table Cooling in Hot Strip Rolling

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Journal of Iron and Steel research International 2012年第9期19卷 43-51页

作者： WANG Xiao-dong 1 , 2 , LI Fei 1 , JIANG Zheng-yi 2 ( 1.shougang research institute of technology , shougang Group , beijing 100043 , china 2.Faculty of Engineering , University of Wollongong , Wollongong NSW 2522 , Australia ) shougang research institute of technology Shougang Group Beijing China Faculty of Engineering University of Wollongong Wollongong Australia

Non-uniformity of temperature distribution across strip width direction is the ultimate reason why the flatness defect occurs on the strip after cooling process although the strip is flat at the exit of finishing *** thermal , microstructural and mechanical coupling analysis model for predicting flatness change of steel strip during the run-out table cooling process was established using ABAQUS finite element software.K Esaka phase transformation kinetics model was employed to calculate the phase transformation , and coupled with temperature calculation using the user subroutine program ***-plasticity constitutive equations of steel material , in which conventional elastic and plastic strains , thermal strain , phase transformation strain and transformation induced plastic strain were considered , were derived and programmed in the user subroutine program *** conclusion that flatness of steel strip will develop to edge wave defect under the functions of the differential thermal and microstructural behaviors across strip width during the run-out table cooling procedure was acquired through the analysis results of this *** results of this analysis model agree well with the actual measurements and observation.

关键词： hot rolled strip internal stress phase transformation run-out table cooling flatness

Level 2 Automatic Control System of LF

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Journal of Iron and Steel research International 2011年第S2期18卷 172-175页

作者： LIU Dan-mei, QIU Cheng-guo, LIAO Hui ( beijing shougang Automation Information technology Company, beijing 100041, china ) beijing shougang Automat Informat Technol Co Beijing 100041 Peoples R China

research on level 2 control system of 100 tons LF furnace was carried out. According to the principle of energy conservation and principle of mass conservation, the LF temperature prediction model and the composition prediction model were established. At the same time, the set value calculated by heating model and addition model could be sent to PLC. The results show that the technical indexes of LF furnace level 2 control system reach the demand and the system realizes automatic control.

关键词： ladle furnace mathematical model level 2 control system

Final Temperature Prediction Model of Molten Steel in RH-TOP Refining Process for IF Steel Production

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Journal of Iron and Steel research International 2012年第3期19卷 1-5页

作者： WANG Yu-nan1, BAO Yan-ping1, CUI Heng2, CHEN Bin3, JI Chen-xi3 (1. State Key Laboratory of Advanced Metallurgy, University of Science and technology beijing, beijing 100083, china 2. Engineering research institute, University of Science and technology beijing, beijing 100083, china 3. shougang research institute of technology, beijing 100041, china) State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing China Engineering research institute University of Science and Technology Beijing Beijing China shougang research institute of technology Beijing China

In order to precisely control the final temperature of molten steel in RH （Ruhrstahl Heraeus）-TOP blowing refining, the final temperature prediction models of molten steel in RH-TOP blowing refining process for Interstitial Free （IF） steel production were established under the condition of oxygen blowing and non-oxygen blowing respec- tively. The results show that the beginning molten steel temperature of refining and the amount of added scrap were influential factors, the baking temperature in vacuum chamber was a factor that had small influence. When the model was operated, the hitting probability was above 95%（under the condition of both oxygen blowing and non-oxygen blo- wing） of prediction deviation ±10℃. The accuracy is analyzed.

关键词： RH-TOP molten steel temperature prediction model

Texture Evolution of 440 MPa Grade Nb-bearing High Strength IF Steel during Rolling and Annealing Process

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Journal of Wuhan University of technology(Materials Science) 2011年第6期26卷 1157-1161页

作者：陈银莉 Engineering research institute University of Science and Technology Beijing

The texture evolution from rolling process to annealing process of 440 MPa grade Nb-bearing high strength IF steel （IF-HSS） was studied. Moreover, the texture of different section in thickness direction of steel sheet after annealing was investigated. Macro-texture measurements using XRD shows that hot rolling texture in Nb-bearing IF-HSS includes a weak γ-fiber and α-fiber, of which main texture components are {001}〈110〉,{111}〈110〉 and {111}〈112〉. It is worthy of note that the γ-fiber skeleton line formed after hot rolling. During cold rolling, the absolute maximum shifts to {111}〈112〉 along the γ-fiber and the maximum along the α-fiber shifts to {112} 〈110〉. During recrystallization annealing process, the weaker α-fiber and stronger γ-fiber cold rolling texture transformed to a very strong γ-fiber annealing texture. After annealing the main components from surface to mid-section along thickness display the same character for both α-fiber and γ-fiber, while textures intensity at 1/4 section is higher than that of surface and mid-section.

关键词： textures recrystallization high strength IF steel

Experimental research of Vanadium-Microalloyed X100 Pipeline Steels

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Journal of Iron and Steel research International 2011年第S1期18卷 920-923页

作者： LI Shao-po,JIANG Zhong-hang,MA Qing-shen,WANG Wen-jun (shougang research institute of technology,beijing 100043,china) shougang Res Inst Technol Beijing 100043 Peoples R China

In order to develop X100 pipeline steels with high strength and low temperature toughness,the steel bearing vanadium has been studied in the *** continuous cooling phase transformation behavior of the steel under deforming condition was *** microstructure of the steel at different cooling rates was observed by ***,by proper producing processes,the X100 pipeline steel was developed successfully in *** composition,processes,microstructure and properties have been analyzed and *** research results showed that the strength of X100 steel can be improved by reducing the cooling stop *** tempering treatment after TMCP can improve the strength of vanadium-microalloyed X100 steel too,without change of the impact toughness.

关键词： X100 microstructure vanadium-microalloyed tempering

Application HTP Process to Produce X80 Strip for 2nd West-East Gas Pipeline Project

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Journal of Iron and Steel research International 2011年第S1期18卷 471-477页

作者： LI Yong-dong 1,LI Ming 2,ZHANG Yong-qing 1,JIN Wei 2,LIU Jian-hui 2,LI Fei 1 (1.shougang research institute of technology,beijing100043,china 2.Qian’an Iron and Steel Company of shougang Group,Qian’an 064400,Hebei,china) shougang Res Inst Technol Beijing 100043 Peoples R China Qianan Iron & Steel Co shougang Grp Qianan 064400 Hebei Peoples R China

HTP practice,alloyed with low-carbon (less than 0.06%) and high-niobium (up to 0.11%),has been developed to produce large-wall X80 hot rolled strip for 2nd West-East Gas Pipeline project *** this paper,existing status of niobium at different rolling stage,such as reheating,rough rolling and final product and strengthening effects have been presented and analyzed *** technological questions concerrned,such as the mixed grain occurred on the delay table,dynamic recrystallization during the finish rolling course,γ→αtransformation and final microstructure obtained at low coiling temperature,have been explored *** results presented increased recrystallization stop temperature due to high niobium contents can provide the requisite to remove waiting-temperature operation of transfer bar before finish rolling to ensure controlled effect of traditional low-temperature,which is benificial not only to production efficiency,but also to uniformity of austenite ***,dynamic-recrystallization occurred during finish rolling may reduce the density of dislocation,but will better the grain gradient along the thickness because the dynamic recrystallization proceeds instantly,which is beneficial to reduce the appearance of separation of impact ***,the lower coiling temperature than traditional TMCP practice,up to 300℃,is a key factor to obtain low-carbon bainite microstructure composed of acicular ferrite and small amount M/A component,which results in high strength and excellent low-temperature toughness.

关键词： 2nd west-east gas pipeline project X80 hot rolled strip HTP high-niobium

The Effect of Microstructure of Hot Rolled Alloy Steel Wire Rods on Cold Heading Annealing Process

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Journal of Iron and Steel research International 2011年第S1期18卷 437-441页

作者： DENG Su-huai 1,WANG Li-ping 1,LI Su-jia 1,XIAO Shu-yong 2 (1.shougang research institute of technology,china 2.shougang High Speed Wire Mill,china)

Cold heading carbon steels for 8.8 grade fasteners are mostly produced by pouring reel or spooler ***,with improvement of cold heading equipment,the 10.9 grade fasteners produced by cold heading have replaced most of hot forged fasteners *** well known,wire rod coil has been used to produce alloy *** properties and microstructures of medium carbon alloy steels,such as B7,ML40Cr and SCM435,produced by wire rod coils under hot rolled condition and after spheroidization,have been *** this paper,the effect of microstructure of hot rolled steel wire rods on cold heading annealing process was *** results show that the hardness of wire rod coil products is generally lower than that of bar products by 5 ～ 10 HRB and the ferrite fraction in wire rod coil products is *** spheroidization treatment,the hardness value and spheroidization grade of wire rod coil products are relatively *** steels of wire rod coils can be directly drawn slightly and the annealing time can be reduced at the same *** practice is much helpful for energy conservation.

关键词： wire rod coil alloy steel cold heading annealing

Influencing Factors on Center Segregation in Continuously Cast Pipeline Steel Slabs

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Journal of Iron and Steel research International 2011年第S2期18卷 352-357页

作者： LIU Yang1, WANG Xin-hua2, WANG Wen-jun1, JIANG Zhong-hang1 (1.shougang research institute of technology beijing 100043 china 2.University of Science and technology beijing 100083, china) shougang Res Inst Technol beijing Beijing 100043 Peoples R China Univ Sci & Technol beijing Beijing 100083 Peoples R China

The factors which influence center segregation of continuously cast slabs are obtained through analyzing the database of macrostructrue. It indicates that center segregation becomes severer with the increasing content of carbon, phosphorus and sulfur; Center segregation will be reduced obviously if the content of manganese is higher than 1.5% and the ratio of Mn/S is higher than 300; High degree of superheat , high casting speed and increasing width of slabs will increase the degree of center segregation. Since center segregation below class B has little effect on the property of steel, hence, in order to low the ratio of center segregation of class B-1.0 down to 10%, several control strategies are presented as follows: the contents of carbon, phosphorus and sulfur must be focalized in lower range of steel grade demanded, but manganese upper operating range control. The referenced contents of the elements in molten steel are required like this: [C]1.5%,[Mn]/[S]>300; The degree of superheat should be lower than 24℃ and the casting speed should be defined to 1.0-1.1 m·min-1. At the same time, proper secondary cooling system of water distribution should be developed and the precision of continuous caster should be also improved.

关键词： continuous casting slab, center segregation, microalloy steel