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Effect of Nb,Mo and Ti on the Microstructures and Mechanical Properties of 700MPa Weathering steel

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Effect of Nb,Mo and Ti on the Microstructures and Mechanical...

第六届国际低合金高强度钢会议

作者： WANG Bing~1,SONG Yu-lai~2,WEN Xiao-ming~3,WANG Hou-xin~4,LIU Qing-you~1 (1.Institute for Structural Materials of CISRI,Beijing 100081,china 2.research and development center of wuhan iron and steel(Group)corp.,wuhan 430080,hubei,china 3.Benxi iron and steel Group Limited Company Benxi 117000,Liaoning,china 4.CITIC-CBMM Microalloying Technology center,Beijing 100081,china)

Using metallurgical structure observation and measurement of mechanical properties such as micro-hardness, tensile test,cold-bend,the effect of Nb,Mo and Ti on the structure and mechanical properties of 700MPa weathering steel was studied under the same rolling *** results show the formation of M/A is promoted by Mo,while inhibited by ***,M/A island,as a hard phase,is harm to the material toughness and plasticity;high M/A island fraction will result in obvious crack during cold *** effect of Nb on increasing the strength of experiment steel is very *** Nb content of 700MPa steel must be higher than 0.05%to ensure the *** optimal mechanical properties of the experiment steel will be gained by the proper match ratio of Nb,Mo and *** industry trial production of 700MPa high-strength weathering steel for container was also developed.

关键词： weathering steel Nb Mo Ti mechanical properties M/A island

Influence of Mo Content on Microstructure and Mechanical Properties of Fire-Resistant Construction steel

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Journal of iron and steel research International 2011年第S1期18卷 903-907页

作者： TONG Ming-wei 1,2,YUAN Ze-xi 1,ZHANG Kai-guang 2,RUI Xiao-long 2 (1.School of Materials and Metallurgy,wuhan University of Science and Technology,wuhan 430081,hubei,china 2.research and development center of wuhan iron and steel (Group) corp.wuhan 430080,hubei,china) wuhan Univ Sci & Technol Sch Met & Mat Wuhan 430081 Hubei Peoples R China wuhan iron & steel Grp corp Ctr Res & Dev Wuhan 430080 Hubei Peoples R China

In order to ensure fire-resistant property of the steel under the condition of the least molybdenum content,effects of molybdenum on microstructure and properties of the fire-resistant construction steel,specially on high temperature strength were *** results show that the room temperature and high temperature strength of the steel is enhanced due to increased Mo content but the impact toughness deteriorates at the same *** fraction of bainite in the microstructure increases with increasing Mo content while the fractions of polygonal ferrite and pearlite *** with the steel of adding Nb alone,it was obvious that combined addition of Mo and Nb could provide better effect in high temperature *** of 0.25mass% Mo in the steel containing Nb could meet fire-resistant requirements of the construction steel and provide better economical effectiveness.

关键词： fire-resistant construction steel high temperature strength microstructure precipitate molybdenum

Study of the Microstructure and Properties of ER70S-6 Wire Rods

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Journal of iron and steel research International 2011年第S1期18卷 929-932页

作者： HUANG Zhi-jun,WANG Yu-tao,XIONG Yan (Products research Institute,R and D center of wuhan iron and steel (Group) corp.ration,wuhan 430080,hubei,china) wuhan iron & steel Grp corp R&D Ctr Prod Res Inst Wuhan 430080 Hubei Peoples R China

After rolling even after drawing,a fraction of martensite may occur in the microstructure of ER70S-6 wire deteriorating the ductility and drawing *** mid-products of drawing for test were heat treated at 350℃ and 500℃,deformed ferrite plus pearlite plus some unchanged martensite and deformed ferrite plus pearlite plus troostite were obtained *** bending test was carried out on both as-drawn and heat-treated *** results showed that the brittleness of the as-drawn rods is not due to defects but due to the presence of martensite in *** sample heat-treated at 500℃ and cooled in oven has the best ductility.

关键词： ER70S-6 microstructure heat treatment ductility

development of 600MPa High Aluminum Cold Rolled Dual Phase steel and Its Application

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Journal of iron and steel research International 2011年第S1期18卷 994-998页

作者： WANG Hui 1,2,LIN Cheng-jiang 1,DENG Zhao-jun 1,GONG Tao 1,TAN Yun-gang 2,YAN Fei 2,YANG Peng 2 (1.research and development center,WISCO,wuhan 430080,hubei,china 2.Cold Rolling Mill,WISCO,wuhan 430081,hubei,china) WISCO Ctr Res & Dev Wuhan 430080 Hubei Peoples R China WISCO Cold Rolling Mill Wuhan 430081 Hubei Peoples R China

An original 600MPa high aluminum dual phase steel had been successfully developed in this *** microstructure analysis showed that the microstructures of the steel mainly consist of ferrite and 16% martensite which distributed around the ferrite grain *** analysis demonstrated that there exist lots of high density dislocations in ferrite as well as an obvious twin-structure and some ribbon structures in *** tensile test and the bake-hardening test showed that the steel delivers an excellent mechanical properties of R p0.2 =350-390MPa,R m =620-660MPa,R p0.2 /R m =0.55-0.65,A 80mm =25-29%,n=0.18-0.21 and an excellent bake-hardening property of BH 2 =50-60MPa as well as an excellent of work-hardening (WH) property of WH=120MPa。The spot-welding test showed that this dual phase steel has a good welding *** to the excellent formability,the steel has been successfully used in the production of some auto parts.

关键词： dual phase steel martensite high density dislocation bake hardening welding property

A simple lattice Boltzmann scheme for low Mach number reactive flows

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Science china(Technological Sciences) 2006年第6期49卷 714-726页

作者： CHEN Sheng1,2, LIU Zhaohui2, ZHANG Chao2, HE Zhu2, TIAN Zhiwei2, SHI Baochang 2 & ZHENG Chuguang2 1. Technology center of wuhan iron and steel (Group) Company, wuhan 430080, china 2. State Key Laboratory of Coal Combustion, Hua Zhong University of Science and Technology, wuhan 430074, china Technology center of wuhan iron steel [Group] Company Wuhan 430080 China State Key Laboratory of Coal Combustion Hua Zhong University of Science Technology Wuhan 430074 China

For simulating low Mach number reactive flows, a simple and coupled lattice Boltzmann (CLB) scheme is proposed, by which the fluid density can bear significant changes. Different from the existing hybrid lattice Boltzmann (HLB) scheme and non-coupled lattice Boltzmann (NCLB) scheme, this scheme is strictly lattice Boltzmann style and the fluid density couples directly with the temperature. Because it has got rid of the constraint of traditional thought in lattice Boltzmann scheme,on the basis of the equality among the particle speed c, the time step △t and the lattice grid spacing △x held, both c and △t can be adjusted in this scheme according to a "characteristic temperature" instead of the local temperature. The whole algorithm becomes more stable and efficient besides inheriting the intrinsically outstanding strong points of conventional lattice Boltz-mann scheme. In this scheme, we also take into account different molecular weights of species, so it is more suitable for simulating actual low Mach number reactive flows than previous work. In this paper, we simulated a so-called "counter-flow" premixed propane-air flame, and the results got by our scheme are much better than that obtained by NCLB. And the more important thing is that the exploration in this work has offered a kind of brand-new train of thought for building other novel lattice Boltzmann scheme in the future.

关键词： lattice Boltzmann, low Mach number flows, reactive flows, simulation.

Study of Burden Distribution Control Based on Infrared Image Pattern Recognition and Case-Based Inference

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Study of Burden Distribution Control Based on Infrared Image...

第五届国际炼铁科技大会

作者： L K Chen (research & development center wuhan iron & steel corp.ration wuhan 430080 china)

Burden and top gas distribution is very important for the operation of blast furnace. In order to control the burden distribution, a model to estimate top gas distribution has been developed based on infrared image pattern recognition. Some cases for burden distribution control are investigated in accordance with the theory of case-based inference and experiences obtained in the condition of change of burden distribution. After that, some new rules have been added into the knowledge base of the expert system of No.1 BF at WISCO. Practice has showed that the model of top gas distribution can be used to control the burden distribution in great extent with good operating results.

关键词： blast furnace image processing top gas control case-based inference burden distribution control

A Power Harvesting System Consists of Cross-distributing Bimorphs with High Real Powerdensity

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A Power Harvesting System Consists of Cross-distributing Bim...

2011年全国压电和声波理论及器件应用研讨会

作者： HUAN XUE~(1,2) RUI GE~1 1 research and development center of wuhan iron and steel group corp.,wuhan 430080 2 Department of Mechanics,Huazhong University of Science and Technology 430074

＜正＞The traditional battery gradually can not play the role of the power source of remote micro-sensors and embedded microelectronic devices due to their rapid *** power the microelectronics by harvesting the enviro... 详细信息

关键词： piezoelectric energy harvester cross-distributing bimorph beam real powerdensity

research and Practice of Production Technology for High Performance Low Alloy steels in WISCO

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Journal of iron and steel research International 2011年第S1期18卷 99-103页

作者： FU Lian-chun,GUO Ai-ming,LIU Ji-bin,GUO Bin,CHEN Yan-tang [wuhan iron and steel (Group) corp.ration,wuhan 430080,hubei,china] wuhan iron & steel Grp corp Wuhan 430080 Hubei Peoples R China

The product system of high strength low alloy steels (HSLA) produced by wuhan iron and steel (Group) corp.ration (WISCO) was presented.A series of high performance structural steels have been developed for important construction projects around the world in different areas,such as bridge,pressure vessel,pipe line,shipbuilding,architecture,machinery and railway *** order to promote the development of large heat input welding steel,high grade thick pipeline steel and long span bridge steel,a lot of advanced production technologies have been achieved through intensive investigation,such as the control of high purity,high homogenization and free defects in steel slabs,the rules of high melting point particle formation and distribution in micro and nano scale during steel production,and the TMCP technology for ultra low carbon bainite steel for medium and heavy *** will carry on research and application of economic and weather-resistant steels and promote the developing and producing technologies of HSLA steel.

关键词： WISCO high performance low alloy steels production technology

Microstructures and Toughness in Simulated Coarse Grain Heat-affected Zones of Copper-bearing steel

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Microstructures and Toughness in Simulated Coarse Grain Heat...

第五届国际材料与热加工物理模拟及数值模拟学术会议

作者： LIU Wenyan1, 2, WANG Lai1, LIU Jibin2, LI Pinghe2, MIAO Kai2, HAN Rongdong2 (1. School of Materials Science and Engineering, Dalian Uniersity of Technology, Dalian 116024, china 2. research and development center, wuhan iron & steel (Group) corp., wuhan 430080, china)

Microstructures and toughness of simulated coarse grain heat-affected zone of hot continuously rolled copper-bearing steel were investigated using physical simulation. The results showed that brittlement is easy to happen in the region of CGHAZ with slower thermal cycles （t8/5≥45s）. Granular bainite transformed from austenite led to brittlement. The dimensions of granular martensite and austenite （M-A） constituents are main factors influencing the impact toughness. There is no visible effect on the toughness when the dimensions of M-A constituents are less than 1 μ m. However, the toughness decreases greatly once the dimensions exceed 1 μ m. Therefore, decreasing the dimensions of M-A constituents by controlling weld heat input will do good to improve the impact toughness of copper-bearing steel.

关键词： copper-bearing steel coarse grain heat-affected zone granular bainite M-A constituents