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A Special TMCP Used to Develop a 800MPa Grade hsla steel

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Journal of University of Science and Technology Beijing 2001年第3期8卷 224-228页

作者： Chengjia Shang,Xuemin Wang, Xinlai He, Shanwu Yang, Yi Yuan Material Science and Engineering School, University of Science and Technology Beijing, Beijing, 100083, China Material Science and Eng. School Univ. of Sci. and Technol. Beijing Beijing 100083 China

The effect of relaxation after finished rolling on structures and properties of four microalloyed steel with different content of Nb and Ti was investigated. By alloy designing and control rolling + relaxation-precipitation-control phase trail storm ati on (RPC) process, a new 800 MPa grade hsla plate steel could be obtained, the microstructure is composite ultra-fine lath bainite/martensite. The tempering process and mechanical properties of this kind of hsla steel were investigated. The yield strength can achieve 800 MPa, and the ductility and impact toughness is satisfied.

关键词： hsla steel microstructure and mechanical properties TMCP (thermomechanical control process) RPC

Continuous Casting of Demanding hsla steel Grades for Heavy Plate Application

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Journal of Iron and steel Research International 2011年第S1期18卷 535-540页

作者： Bernhard Hoh Process Technology steel Eichenweg 2546569 HuenxeGermany

Continuous casting has evolved as the most important production process in the steel *** it counts for about 95% of the world’s steel *** to its rising significance,the process technologies have been enhanced in yield,productivity and-in particular quality of semi-finished products has been improved close to the realm of *** optimizing the product quality beyond the present status has to put the whole manufacturing route from hot metal and/or steel melting through refining to continuous casting under integrated *** for the production of hsla steel grades of the highest standard are clean steel,internal soundness and defect-free slab *** this context a brief look is cast on the recent trend of process technology in casting "thick slabs" for extra-heavy plate production.

关键词： hsla steel integrated process control clean steel heavy slab surface cracking segregation heavy plate

Effect　of　boron　on　microstructure　and　toughness　of　simulated　CGHAZ　of　hsla　steel

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China Welding 1995年第1期4卷 37-43页

作者： Tian Dewei Qian Bainian Si Zhongyao and Yang Haixue(Institute of Metal Research,Academia Sinica)

Effect of boron on microstructure and toughness of simulated CGHAZ of 790 MPa grade hsla steel was *** the CGHAZ,boron improved the toughness of granular bainite(Bg),but deteriorated that of *** major reason of boron improving toughness of Bg was to reduce *** of M-A *** reasons of martensitic brittleness in microstructure were discussed in *** experimental results proved that the order state of dislocations was an important factor of martensitic brittleness caused by boron, and the higher the order degree of dislocations was, the more brittle the martensite was.

关键词： martensitic brittleness boron hsla steel simulated CGHAZ microstructure

Effects of B and Ti on the Toughness of hsla steel Weld Metals

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Journal of Materials Science & Technology 1992年第4期8卷 294-298页

作者：斯重遥王兆清刘鹏虞德华刘磊 Institute of Metal Research Academia SinicaShenyang110015China Capital Iron and steel Company Beijing100053China

Effects of microalloying Ti and B on the microstructures and low temperature toughness of manual metal arc (MMA) deposits were investi- *** metals containing 200-300 ppm Ti and 29-60 ppm B deposited by manual coated elec- trodes provided an optimum low temperature *** addition of B in weld metals low- ered the γ→α transformation temperature which promoted the acicular ferrite (AF) transformation. Solid solutioned B suppressed grain boundary ferrite as well as side plate ferrite formation and benefited the acicular ferrite *** protected B from oxidizing as well as nitriding and formed Ti-Mn silicate ***-high volt- age electron microscope analyses showed that TiO structure in the Ti-Mn silicate inclusions was the favorable nucleation site for acicular ferrite forma- tion.

关键词： toughness acicular ferrite hsla steel weld metals addition of B and Ti

Static and Dpoamic Coarsening of Niobium Carbide in hsla steel

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Journal of Modern Transportation 1995年第2期12卷 149-156页

作者： Yang Liu (Department of Materials Engineering,Southwest Jiaolong University,)Chengdu 61 003 1, China

An experinientally quantitative inveetisation has been made on the precipitationand coarsening behaviors of niobium carbide in a high strength low alloy(hsla) steel. The results suggest that the static coarsening processes duringisothermal reaction in (α+γ) two phase region and during isothermal stay aftercertain amount of deformation of austenite are principally controlled by thediffusion of niobium atoms along dislocation pipes, and the volume fraction ofthe precipitates exerts sisnificant influence on the coarsening *** the dynamic coarsening process during hot deformation of austeniteappoars to be dominated by the carbide/matrix interphase reaction.

关键词： precipitation coaroening niobium carbide hsla steel

Ausforming effects on anisotropy of mechanical properties in hsla martensitic steel

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Science China(Technological Sciences) 2012年第7期55卷 1806-1813页

作者： LI ZhaoDong SUN XinJun CAO WenQuan YONG QiLong YANG ZhiGang DONG Han WENG YuQing Institute for Structural Materials Central Iron and Steel Research InstituteBeijing 100081China Department of Materials Science and Engineering Tsinghua UniversityBeijing 100084China The Chinese Society-for Metals Beijing 100711China

In order to clarify effects of prior pancaked austenitic structure on microstructure and mechanical properties of transformed martensite in ausformed steel,a super-thin pancaked austenite was processed by multi-pass rolling in a 0.03-2.6Mn0.06Nb-0.01Ti(wt%) low alloy *** evolution of prior pancaked austenite grain during multi-pass rolling was studied using Ni-30Fe model *** with the structure and texture in the prior super-thin pancaked austenite in Ni-30Fe alloy,the texture and anisotropy of mechanical properties of transformed martensite in the studied ausformed steel were focused *** were mainly three kinds of rolling texture components in the super-thin pancaked austenite:Goss {110} 001,copper {112} 111 and brass {110} *** were further transformed into the weak {001} 110 and strong {112} 110,{111} 112 texture components in the martensitic *** orientation relationship(OR) of lath martensite transformation from pancaked austenite in the ausformed steel deviated larger from the exact Kurdjumov-Sachs(K-S) OR than in the case of equiaxed austenite without *** tensile and yield strengths of the ausformed martensitic steel first decreased and then increased as the angle between tension direction and rolling direction *** main reason for the anisotropy of strength was considered as the texture component {112} 110 in ***,the anisotropy of impact toughness was more complex and the main reasons for it are unknown.

关键词： pancaked austenite lath martensite texture strength and toughness hsla steel

MODELING OF ISOTHERMAL PRECIPITATION KINETICS IN hsla steelS AND ITS APPLICATION

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Acta Metallurgica Sinica(English Letters) 2004年第6期17卷 902-906页

作者： X.M.Zhao D.Wu L.Z.Zhang Z.Y.Liu TheStateKeyLab.ofRollingandAutomation NortheastemUniversityShenyang110004China

Microalloying elements in high-strength low-alloy steels, such as Nb, Ti and V, precipitate during hot-rolling processes. On the basis of classical theory of nucleation and growth, quanti- tative modeling of isothermal precipitation was developed, which was tested by the stress rela- xation method, the calculated precipitation-time-temperature curve is in good agreements with the measured results, then the model was applied to predict the precipitation behavior during continuous cooling.

关键词： isothermal precipitation kinetics hsla steel

Effect of Heat Input on Microstructure and Toughness of Coarse Grain Heat Affected Zone in Nb Microalloyed hsla steels

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Journal of Iron and steel Research International 2009年第5期16卷 73-80页

作者： ZHANG Ying-qiao ZHANG Han-qian LI Jin-fu LIU Wei-ming Department of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 200030 China Research Institute for Advanced Structural steel Research and Development Center Baoshan Iron and Steel Limited Company Shanghai 201900 China

The influence of Nb on microstructure, mechanical property and the transformation kinetics of the coarse grain heat affected zone （CGHAZ） in hsla steels for different heat inputs, has been investigated. When welded at higher heat inputs （100-60 kJ/cm）, impact toughness values of the steel without Nb are much higher than those of the steel with Nb, and the lowest span is 153 J at 60 kJ/cm. But only a little higher values are observed at lower heat inputs （40-30 kJ/cm）, and the highest span is 68 J at 30 kJ/cm. Dilatation studies indicate that continuous cooling transformation starting temperatures （Ts） of CGHAZ for the steel with Nb are approximately 15-30℃ which are lower than those of the steel without Nb at all heat inputs. For higher heat inputs, Nb in solid solution suppresses ferrite transformation and promotes the formation of granular bainite which has detrimental effect on impact toughness. For lower heat inputs higher Charpy impact energy values in the steel with Nb are associated with the formation of low carbon self-tempered martensite.

关键词： hsla steel coarse grain heat affected zone heat input Niobium impact toughness

The State-of-Art and Development Trends of hsla steels in China

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Journal of Iron and steel Research International 2011年第S1期18卷 1-13页

作者： WENG Yu-qing 1,YANG Cai-fu 2,SHANG Cheng-jia 3 (1.The Chinese Society for Metals,Beijing,PR China 2.Centre Iron and steel Research Institute,Beijing,PR China 3.University of Science and Technology Beijing,Beijing,PR China) Chinese Soc Met Beijing Peoples R China Ctr Iron & steel Res Inst Beijing Peoples R China Univ Sci & Technol Beijing Beijing 100083 Peoples R China

During the last decade,the adjustment of product segments always is a very important task of iron industry,and upgrading of steel products has been impelled actively by Chinese iron and steel *** rapidly increasing of iron & steel production,a series of research achievements have been made in the technology area of high strengthtoughness steel,and also have been applied successfully in the actual production,*** technology of fine grain and ultra-fine grain steels,the technology for the control of microalloying ***,It is an important strategic goal of "Twelfth Five-year Plan" for Chinese iron and steel industry that the adjustment of steel product segments and meeting the requirements for upgrading of domestic and oversea equipment manufactory *** hsla steel with better performance,instead of plain steel,could save steel consumption largely,and also release pressures from resource,energy and *** doubt,it is the only way to realize the sustained development of Chinese iron and steel industry by popularizing the application of hsla steels vigorously.

关键词： hsla steel microalloying technology Chinese iron and steel industry