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

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Journal of iron and steel Research International 2011年第S1期18卷 300-305页

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) Inst Struct Mat CISRI Beijing 100081 Peoples R China Wuhan iron & steel Grp Corp Ctr Res & Dev Wuhan 430080 Hubei Peoples R China benxi iron & steel Grp Ltd Co Benxi 117000 Liaoning Peoples R China CITIC CBMM Microalloying Technol Ctr Beijing 100081 Peoples R 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

Effect of Ce on the cleanliness, microstructure and mechanical properties of high strength low alloy steel Q690E in industrial production process

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International Journal of Minerals,Metallurgy and Materials 2019年第11期26卷 1372-1384页

作者： Hao wang yan-ping Bao ming Zhao Min wang Xiao-ming yuan Shuai gao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Technical center of Inner Mongolia Baotou steel Union Co. Ltd.Baotou 014010China The Rare Earth steel Plates Plant of Baotou iron and steel Co. Ltd.Baotou 014010China

In order to improve the strength and toughness of Q690 E steel sheets,the effect of rare earth element Ce on the strength and toughness of Q690 E steel was studied by means of transmission electron microscopy,scanning electron microscopy,and metallographic *** results showed that the addition of Ce in steel limited the combination of S with Mn and Ca,transformed Al2O3 inclusion into spherical CeAlO3 inclusion,and modified the precipitate form of some composite inclusions of TiN and sulfide oxides into TiN precipitation *** inclusions were *** size of inclusions was decreased from 3–5μm to 1–2μm,and the distribution was *** played a role in purifying molten steel through desulphurization and ***,the addition of Ce in steel effectively increased the nucleation particles in the liquid phase,improved the nucleation rate,enlarged the equiaxed grain refinement area,and limited the development of columnar *** average grain size of slab decreased from 45.76 to 35.25μm,and the proportion of large grain size(>50μm)decreased from 40.41%to 23.74%.The macrostructural examination of slab was improved from B0.5 to C2.0,which realized the refinement of the solidified structure and reduced the banded structure of hot rolled *** addition,due to the inheritance of refined structure in the upstream,the recrystallization of deformed austenite and the growth of grain after recrystallization were restrained,and a refined tempered sorbite structure was *** rare earth element Ce was added,the width of the martensite lath bundle was narrowed from about 500 nm to about 200 nm,which realized a remarkable grain refinement strengthening and toughening *** properties such as tensile,yield,and low-temperature impact toughness were significantly improved.

关键词： rare earth HSLA steel inclusion structure grain refinement strengthening

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...

Effect of coiling and annealing temperatures on yield point behavior of low-carbon steel

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

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Journal of iron and steel Research International 2020年第3期27卷 325-333页

作者： Zhi-ming li Xiang li Lei yang Zheng-yan Shen Bi-lei wang Shun-li Zhao gao-fei liang Chang-jiang Song State Key Laboratory of Advanced Special steel School of Materials Science and EngineeringShanghai UniversityShanghai 200072China technology center of Baoshan iron&steel Co. Ltd.Shanghai 201900China

Low-carbon steel is widely used for household appliance and automotive panel steel because of its excellent ***,yield point phenomena easily appear in the low-carbon steel produced by a continuous annealing process and cause degradation to the surface quality during *** effect of the coiling temperature(600-750℃)and annealing temperature(740-820℃)on the yield point behavior is *** tests show that coiling temperature has a greater effect on yield point elongation(YPE)and aging index(AI)than the annealing *** observations show that coiling temperature at 750℃would make the micron-sized carbides appearing at the grain boundary disappear and a number of dispersed nanoscale carbides precipitate in grain interior,corresponding to the highest solid solution carbon content in the matrix of 750℃coiled *** experimental results suggest that AI rather than YPE has a positive relationship with the solid solution carbon content of the low-carbon *** YPE has a positive relationship with the upper/lower yield strength.

关键词： Low-carbon steel Carbide Yield point elongation Coiling temperature Annealing temperature

Effect of increased nitrogen content on continuous cooling transition of γ→α in hot-deformed low-C Mo-V-Ti steels

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Journal of iron and steel Research International 2019年第7期26卷 733-742页

作者： Xin-ping Xiao Gen-hao Shi Shu-ming Zhang yu-wei gao Qing-feng wang Fu-cheng Zhang State Key Laboratory of Metastable Materials Science and technology Yanshan University Qinhuangdao 066004 Hebei China Qinhuangdao Vocational and Technical College Qinhuangdao 066100 Hebei China National Engineering Research center for Equipment and technology of Cold Strip Rolling Yanshan University Qinhuangdao 066004 Hebei China

The two-stage controlled rolling and cooling at 0.5-50℃/s of low-carbon Mo-V-Ti steels with the increasing nitrogen content from 0.0032 to 0.0081 and 0.0123 wt.% were simulated through a Gleeble 3500 system. The continuous cooling transition (CCT) of γ→α in each steel was estimated via microstructure characterization and CCT diagram. The results indicated that CCT diagram for each steel was divided into three regions of γ→ferrite,γ→pearlite and γ→ bainite, and the increasing N content elevated all the starting temperatures for γ→α. Consequently, the polygonal ferrite (PF) and pearlite formed in each steel cooled at 1℃/s and, however, the increasing N content led to slightly coarser ferrite grain and pearlite colony. With the increased cooling rate to 10 and 30℃/s, a mixed microstructure of acicular ferrite (AF), granular bainite (GB) and lath bainite (LB) formed in 32N steel and in contrast, the mixture of PF+AF+GB in 8IN and 123N steels. The increasing N content promoted (Ti,V)(C,N) precipitation, enhanced the intragranular PF/AF nucleation, increased martensite/austenite constituent and depressed LB. In addition, the mechanisms dominating the effect of increasing N on this CCT of γ→α were discussed.

关键词： V-N microalloyed steel Continuous cooling transition Microstructure Precipitation Intragranular ferrite

High cycle rotating bending fatigue performance and fracture behavior in a pearlite-ferrite dual-phase steel

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Journal of iron and steel Research International 2022年第3期29卷 519-528页

作者： Xin-bo Ji Si-xin Zhao li-ming Fu Jian Peng Jia-qiang gao Da-jiang yu Zong-ze Huang Ai-dang Shan School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China Baosteel Research Institute Baoshan Iron and Steel Co.Ltd.Shanghai201900China

To clarify the effects of ferrite morphologies and contents on high-cycle fatigue property of pearlite-ferrite dual-phase(DP)steel used for fabrication of commercial vehicle crankshafts,two types of DP steels with different ferrite grain sizes(S10:13.1μm and S30:21.4μm)and ferrite contents(S10:~9.5 vol.%and S30:~30.4 vol.%)were *** amplitude-logarithm of number of high cycles to failure fatigue of the two DP steels was *** results showed a fatigue strength of 510 and 400 MPa for S10 and S30 steels,respectively,at 10^(7) *** cracks in S10 steel extended preferentially along the grain boundary,but it was easy for crack propagation to extend within a pearlite colony to form a zigzag crack *** roughness was enhanced and high stress was introduced to the crack surface due to this kind of crack propagation behavior,which has positive effects on slowing down crack ***,the crack propagation in S30 steel mainly occurred inside the soft equiaxed coarse ferrite *** revealed that little stress was introduced to the crack *** results show that it is possible to improve high cycle fatigue strength of pearlite-ferrite DP steel by appropriately manipulating the volume fraction and microstructure morphology of ferrite phase.

关键词： Pearlite-ferrite steel Ferrite morphology Ferrite content Fatigue perfomance Fracture characteristics

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南芬红铁矿选矿工艺研究

本钢技术 2008年第6期 4-7页

作者：张红高秋爽本钢技术中心

介绍了南芬红铁矿工艺矿物学特征和选矿试验研究情况,以及采用阶段磨矿—弱磁—强磁—阴离子反浮选工艺流程的扩大连选试验结果。连选试验获得品位65.84%,回收率91.13%的铁精矿,为红铁矿综合利用和选厂工业设计提供了可靠的依据。

关键词：红铁矿弱磁选强磁选阴离子反浮选

Biocorrosion induced by red-tide alga-bacterium symbiosis and the biofouling induced by dissolved iron for carbon steel in marine environment

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Journal of Materials Science & technology 2022年第33期128卷 107-117页

作者： yuqiao Dong Guang-ling Song Jiawei Zhang yahui gao Zi ming wang Dajiang Zheng center for Marine Materials Corrosion and Protection College of MaterialsXiamen UniversityXiamen 361005China School of life Sciences and Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems Xiamen UniversityXiamen 361102China Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen 518055China The University of Queensland School of Mechanical and Mining EngineeringDivision of Materials EngineeringSt LuciaQld 4072Australia

The assemblages of unicellular microalgae and bacteria in phytoplankton communities can generally result in biodeterioration of metals in marine *** this study,the self-promoted biofouling mechanism underneath red-tide alga Phaeodactylum tricornutum and its symbiotic bacterium Bacillus altitudinis was systematically *** mutualistic interaction of the bacteria and algae quadrupled the corrosion rate in comparison to the individual effect of the bacterium or algal strain ***,the corroded metal appeared to be an accelerator that can stimulate the activity of the *** and aggravate the biological pollution based on the result of 62.3%up-regulation of the key photosynthesis *** corrosion-biofouling-accelerated corrosion-deteriorated biofouling formed a vicious cycle.

关键词： Algal-bacterial symbiosis Marine biofouling Carbon steel Corrosion products

150 mm×150 mm小方坯结晶器内流场及凝固行为模拟

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连铸 2024年第2期 56-63页

作者：贾进高飞罗霄邹铭周文浩张华方庆湖南华菱湘潭钢铁有限公司科技质量部湖南湘潭411101 武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室湖北武汉430081

结晶器是整个连铸过程的核心环节,其内钢液流动、传热及初始凝固行为直接影响着铸坯质量,而拉速和过热度等工艺条件是影响结晶器冶金行为的关键参数。以某厂150 mm×150 mm小方坯结晶器为研究对象,建立耦合数学模型,分析过热度及拉速对... 详细信息

结晶器是整个连铸过程的核心环节,其内钢液流动、传热及初始凝固行为直接影响着铸坯质量,而拉速和过热度等工艺条件是影响结晶器冶金行为的关键参数。以某厂150 mm×150 mm小方坯结晶器为研究对象,建立耦合数学模型,分析过热度及拉速对结晶器内钢液流动与传热行为的影响。结果表明,当拉速由2.4 m/min增至3.0 m/min时,结晶器出口处铸坯角部温度与面部温度分别由960 K、1 050 K增至1 040 K、1 200 K;结晶器出口处坯壳厚度由11.21 mm降至8.71 mm,计算域出口处坯壳由16 mm降至14 mm;当过热度由15 K增至35 K时,铸坯表面和中心温度相应升高,幅度大致为5~10 K,结晶器出口坯壳厚度由10.45 mm降至9.01 mm,计算域出口处坯壳厚度由15 mm降至13 mm。研究结果可为冷镦钢小方坯连铸结晶器制定合理的工艺参数提供理论指导。

关键词：结晶器流场初始凝固拉速过热度