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The research and Development of Hot Rolling Marine Sorbite Rail steel

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Journal of iron and steel research International 2011年第S1期18卷 756-761页

作者： YANG Zhong-min JI Yu china iron & steel res inst grp Cent Iron & Steel Res Inst Beijing Peoples R China Wuhan iron & steel grp Corp Wuhan Peoples R China

This article describes research and development results of the hot-rolled air-cooled fine lamellar pearlite (sorbite) rail,by the optimal regulation of chemical *** cross section of rail is fine pearlite (sorbite),whi... 详细信息

关键词： hot rolling air cooled rail steel sorbite corrosion resistance

research on Alloying Design and Process Control for X100 Hot-Rolled Strips

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Journal of iron and steel research International 2011年第S1期18卷 675-680页

作者： JIA Shu-jun 1,LIU Qing-you 1,PENG Ling-li 1,QU Peng 2 (1.china iron and steel research institute Group,Beijing 100081,china 2.Benxi steel Group Corporation,Benxi 100083,Liaoning,china) china iron & steel res inst grp Beijing 100081 Peoples R China Benxi steel grp Corp Benxi 100083 Liaoning Peoples R China

The influence of alloying design,controlled rolling technology and cooling system of X100 hot-rolled strips on microstructure and micro-hardness has been discussed in detail in this *** results show that optimal chemical composition range of X100 hot-rolled strips is obtained on the basis of X80 by increasing contents of C,Mn,Ni and Mo of *** granular bainite microstructure could be refined and the volume fraction and size of M-A islands could be controlled in a reasonable range by reasonably regulating cooling rate and coiling temperature of X100 pipeline steel,which ensure high strength and toughness of X100 pipeline steel.

关键词： alloying design deformation cooling rate final cooling temperature granular bainite

Effect of Barium-Precursors on Reaction Kinetics in Y-Ba-Cu-O System

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Journal of Rare Earths 2001年第4期19卷 241-245页

作者：王龙妹 Central iron and steel res. inst. Beijing 100081 China

The reactions of stoichiometric Y2O3, CuO, and different Ba salts or oxides (BaCO3, Ba(NO3)(2), BaO2, BaCuO2) for forming various compounds in the Y-Ba-Cu-O system (i.e., YBa2Cu3O7-delta, BaCuO2, Y2BaCuO5 and Y2Cu2O5) were systematically investigated by thermal analysis and X-ray diffractometry. The relevant activation energies were calculated from thermogravimetric data. It is found that the reaction pathway significantly depends on the thermal stability of the Ba precursors. Binary BaO-CuO phases form at low temperature (650 similar to 700 degreesC) when in presence of easy- to -decompose Ba precursors, and then slowly transform to ternary compounds. On the contrary, when Ba ions are released at temperature higher than 900 degreesC, ternary phases form directly from the components.

关键词： rare earths Y-Ba-Cu-O precursors sequencing kinetics

Effect of Aluminum and Titanium Treatment on Non-Metallic Inclusions and Microstructures of CGHAZ in HSLA steel

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Journal of iron and steel research International 2011年第S1期18卷 360-365页

作者： CHAI Feng,YANG Cai-fu,SU Hang,ZHANG Yong-quan,ZHANG Dan-dan (china iron and steel research institute,Beijing 100081,china) china iron & steel res inst Beijing 100081 Peoples R China

The Effect of A1 and Ti treatment on non-metallic inclusions and microstructures of coarse-grain HAZ in HSLA stee1 was investigated in this paper based on experiments and thermodynamic *** results showed that the inclusions in A1 treated steel were mainly aluminum oxides and titanium nitrides which could not promote the formation of acicular ferrite *** of coarse-grain HAZ in A1 treated steels consists of heavy grain boundary ferrite and ferrite side *** inclusions in Ti treated steel were A1,Ti,Mg,Ca composite oxides with size in the range of 0.5-3μm and titanium nitrides with size less than 0.3μ*** composite oxide could promote the formation of acicular ferrite and microstructures of coarse-grain HAZ in Ti treated steel consists of grain boundary ferrite,small amounts of ferrite side plate and large amounts of intragranular acicular *** size of grain boundaries ferrite was increased and the amount of ferrite side plate was decreased with the increase of soaking time at the peak *** amount of grain boundary ferrite and the size of acicular ferrite were also increased with the increase of cooling rate during ferrite phase formation.

关键词： Ti treatment A1 treatment coarse grain HAZ grain boundary ferrite acicular ferrite

Thermal Activation Analyses of Dynamic FractureToughness of High Strength Low Alloy steels

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Journal of Materials Science & Technology 2001年第2期17卷 215-218页

作者： Cunjian LI and Shaohua LI Welding research Department, Central iron & steel research institute, Beijing 100081, china Yuqing DENG State Administration of Metallurgical Industry, Beijing 100711, china Dept. of Welding res. Central Iron and Steel Res. Inst. Beijing 100081 China

A formula is derived for determining the influence of temperature and loading rate on dynamic fracture toughness of a high strength low alloy steel (HQ785C) from thermal activation analysis of the experimental results of three-point bend specimens as well as introducing an Arrhenius formula. It is shown that the results obtained by the given formula are in good agreement with the experimental ones in the thermal activation region. The present method is also valuable to describe the relationship between dynamic fracture toughness and temperature and loading rate of other high strength low alloy steels.

关键词： test GB Thermal Activation Analyses of Dynamic FractureToughness of High Strength Low Alloy steels

More Discussion on High Efficiency & Low Cost Clean steel Production Platform

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Journal of iron and steel research International 2011年第S2期18卷 1-8页

作者： YIN Rui-yu (Central iron and steel research institute, Beijing, 100081) Cent iron & steel res inst Beijing 100081 Peoples R China

The construction of high efficiency, low cost clean steel platform is one of the common key technologies concerning efficiency, quality and cost. It is basic and universal and not only applicable in the R&D and production of "high-end" products, but also in the production of bulk ordinary steel products. The platform of high efficiency, low cost clean steel is the important direction of modern steel technology progress and has great significance on the competitiveness of each steel plant. The research of high efficiency, low cost platform not only involves the production and management of the steel plant, but also the academic research field (process engineering and dynamic operation) and theories and methods innovation of engineering design (theory and method of dynamic-precision design). The integrated theory and method of high efficiency and low cost clean steel platform is the binding point of metallurgical process engineering and material engineering. Different types of high efficiency, low cost clean steel platform should combine with the corresponding rolling process and iron making process so that high efficiency, low cost clean steel manufacturing system would come into being.

关键词： more discussion high efficiency & low cost clean steel platform integration technology

Recent Development and Applications of V Microalloying Technology in china

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Journal of iron and steel research International 2011年第S1期18卷 836-842页

作者： YANG Cai-fu,SU Hang,CHAI Feng,PAN Tao,ZHANG Yong-quan (Central iron and steel research institute,Beijing 100081,china) Cent iron & steel res inst Beijing 100081 Peoples R China

This paper reviews recent developments of V microalloying technology and its applications in HSLA ***-nitrogen in V-containing steel promotes precipitation of fine V(C,N) particles,and improves markedly precipitation strengthening effectiveness of vanadium,therefore,there is a significant saving of V addition in the same strength *** can be used effectively for ferrite grain refinement by the nucleation of intragranular ferrite promoted by VN precipitates in *** combination of intragranular ferrite (IGF) on VN particles and the recrystallization controlled rolling (RCR) technology realize the grain refinement in V-containing steel.V-N process is a cost-effective way for high strength rebars,forging steels and thin slab direct rolling strips.

关键词： V microalloying precipitation strengthening intragranular ferrite recrystallization controlled rolling

Study of Origin of Shape Memory Effect for TiNi Alloy byPositron Annihilation

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Journal of Materials Science & Technology 1998年第4期14卷 368-370页

作者： Wang, JC You, FQ Qi, JL Tang, XF Shanghai iron & steel res inst Shanghai Key Lab Met Funct Mat Shanghai 200940 Peoples R China Shanghai iron & steel res inst Res Ctr Shanghai 200940 Peoples R China Tongji Univ Dept Phys Shanghai 200092 Peoples R China

A number of specimens of Ti-51Ni (at. pet) alloy showing reversible shape memory effect (RSME) have been measured as to reversibility and S-lineshape parameter of positron annihilation. It is found that the Ti-51Ni specimens showing good memory effect contain structural defects. Not all specimens including structural defects (or structural imperfection) are able to exhibit good memory effect. The structural defects have to be appropriate in density, neither too much nor too little. With no or too much structural defects a good RSME could not take place. It is fully as important that the structural defects exist as it is for the structural defects to be appropriate in density in order to obtain a good RSME.

关键词： Titanium alloys

Development of Deep Desulphurization Process for X65 HIC resistant Pipeline steel

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Journal of iron and steel research International 2011年第S2期18卷 92-97页

作者： DENG Xu-yan1, ZOU Chang-dong1, ZHOU Yan-zhao1, XIA Qi1, HUANG Zhu-ping2, DING Zhen-tao2 (1. steelmaking and Casting Group, institute of research of iron and steel of Jiangsu (Shasteel), Suzhou 215625, Jiangsu, china 2. Hongfa steelmaking Plant, Shasteel Group, Suzhou 215625, Jiangsu, china) inst res iron & steel Jiangsu Shasteel Steelmaking & Casting Grp Suzhou 215625 Jiangsu Peoples R China Shasteel grp Suzhou 215625 Jiangsu Peoples R China

The effect of ladle slag composition, bottom stirring intensity, and refining duration on desulphurization (De-S hereafter) behavior was investigated in ladle furnace (180t) through production data analysis and plant scale experiments. The results show that the ladle slag composition for deep De-S is w(CaO): 50%-55%, w(CaF2): 3%-7%, w(Al2O3): 20%-25%, w (SiO2) steelmaking trial of X65 HIC resistant steel, the sulfur content of final product was controlled to be below 10 ppm when sulfur content of the melt at BOF blowing end was kept below 60 ppm, De-S was carried out with the above mentioned slag, and 600 L/min Ar stirring for more than 20 min.

关键词： ultra low sulfur LF De-S HIC resistant