Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information最新文献

{"title":"Thermodynamic investigations of steel deoxidation process with calcium and barium","authors":"L. Makrovets, I. V. Bakin","doi":"10.32339/0135-5910-2023-6-465-475","DOIUrl":"https://doi.org/10.32339/0135-5910-2023-6-465-475","url":null,"abstract":"The use of alloys with alkaline earth metals (AEM) it possible to optimize the processes of deoxidation and refining of steel from non-metallic inclusions. The technologies of ladle treatment of the melt with the use of AEM complexes to obtain high-quality metal products even if it is impossible to use expensive equipment (vacuumers, tribe apparatus, etc.), which is often typical for small steel foundries. At the same time, a number of issues related to the mechanisms implemented during the refining of liquid steel with calcium and barium require further study. In the course of this work, the authors constructed state diagrams of double (CaO–BaO) and ternary (FeO–CaO–BaO) oxide systems and carried out thermodynamic modeling of equilibria in the Fe–Ca–Ba–C–O system. It is noted that in this system there is an extensive equilibrium region of the oxide melt with solid solutions of CaO-based oxides. The solubility surfaces of components for the temperatures of steel ladle treatment (1550–1600 °С) and for different carbon contents (0; 0,1; 0,4 % С) are constructed for the studied system. A comparative analysis of the constructed diagrams suggests that a change in the carbon content within the indicated limits does not significantly affect the type of the diagrams. It follows that the revealed patterns will be maintained in the production of a wide range of economically alloyed low-carbon steels. It is shown that during the deoxidation of steel without aluminum, and with a calcium content typical for real production processes (about 30 ppm), the expected active oxygen content is about 30 ppm (log[O] = –2.5), which does not meet modern requirements for purity become. At the same time, a change of the barium content has practically no effect on the degree of deoxidation of the metal. Thus, it is shown that the main role of calcium and, especially, barium in the processing of liquid steel is modification and removal of non-metallic inclusions from the melt","PeriodicalId":429631,"journal":{"name":"Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139353520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of blast furnace production using digital technology","authors":"A. N. Dmitriev, M. Zolotykh, G. Y. Vit’kina","doi":"10.32339/0135-5910-2023-6-455-464","DOIUrl":"https://doi.org/10.32339/0135-5910-2023-6-455-464","url":null,"abstract":"The role of mathematical models in the improvement of the blast furnace smelting technology is shown. Examples include the new developments of the Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences in the field of digital models of blast furnace production, in particular, two-dimensional and three-dimensional mathematical models of the thermal state of various zones of the blast furnace, including analysis and forecast of phe-nomena of gas dynamics, heat exchange, recovery in blast furnace using a complex of mathematical models; monitoring of refractory lining state and hearth filling using three-dimensional mathematical model of thermal processes; forecast of silicon content and other elements in cast iron and slag based on neural network technologies; optimization of the composition and improvement of metallurgical characteristics of iron ore agglomerate and coke in order to increase the efficiency of blast furnace melting and analysis of the efficiency of blast furnaces based on the calculation of the minimum consumption of coke. These models are based on the consideration of physical, chemical and thermal phenomena occurring in the blast furnace, taking into account their two-dimensional nature implicit in the problem statement. The developed complex of models includes balance (equilibrium) model, models of gas dynamics, heat exchange, reduction, cohesion zone. New developments in the field of analysis and control of thermophysical and physicochemical phenomena occurring in different zones of the blast furnace allow to raise the technology and methods of blast furnace melting to a fundamentally new level, which saves fuel and energy resources. The possibility of using a digital model in tempo with a process using sensor readings through the blast furnace department management system of the enterprise is shown.","PeriodicalId":429631,"journal":{"name":"Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139353078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Core mixture based on modified lignosulfonate.","authors":"A. P. Firstov, O. I. Shevchenko","doi":"10.32339/0135-5910-2023-5-401-405","DOIUrl":"https://doi.org/10.32339/0135-5910-2023-5-401-405","url":null,"abstract":"Technical lignosulfonates (LST) are a by-product in the production of cellulose by the sulfite method. Lignosulphonates are the third most widely used binder in foundries (after clay and liquid glass). They are used for rawforming, dryforming, making rods in heated tooling, non-stick paints, etc. Molding mixtures with only one LST are not used, as they have low strength due to the occurrence of stresses and cracks in the films of this binder. In addition, LST, like all water-soluble binders, have a suspended hygroscopicity, which reduces thestrength of the rod (mold) during storage. However, when hydrophobic additives are introduced into the LST, the latter disadvantage decreas-es.Previously, calcium hydrosulfate (cooking acid with a calcium base) was used for sulfite cooking of cellulose and calcium lignosulfanates were in the LST. Now mainly cooking acids with sodium mixed with Ca–Na are used, and an-yway, the strength properties for mixtures are insufficient. In order to eliminate these disadvantages, plasticisers and modifiers are added to LST. For forming raw, dry and making rods, LST with a sodium base is used, lignosulfonate modified with hexavalent chromium (CrO3) is used, clay mixtures are introduced, LST is used with other binders, as a combined binder (for example, USK). The aim of the work is to develop a modifying additive based on the binder LST-USK, a component of the core mixture used at JSC “NTKRZ”, which is not inferior to the known core compositions, with its subsequent possible use in production. As a second additive, and the possibility of introducing it in production, the composition of the core mixture with sunflower oil was tested on the casting radiator MS-140-M2-500.","PeriodicalId":429631,"journal":{"name":"Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information","volume":"214 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139368443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of technological heating used in the manufacture of parts on the initial structure of 10G2FBYu steel after controlled rolling","authors":"N. T. Kareva","doi":"10.32339/0135-5910-2023-5-381-390","DOIUrl":"https://doi.org/10.32339/0135-5910-2023-5-381-390","url":null,"abstract":"Modern pipe steels for the main pipelines belong are of the high-strength class of X70 and higher. The steels must simultaneously still have sufficient viscosity at low operating temperatures, hardenability and good weldability. This set of properties is achieved by combining the optimal material composition and the method of manufacturing a sheet billet using controlled rolling. Subsequent operations for the manufacture of pipes, connecting parts of oil and gas pipelines (welding, heat treatment, etc.), accompanied by inevitable high-temperature heating, can significantly affect the initial structure of the sheet and the level of its properties. In this case, the possible growth of austenite and ferrite grains, as well as the loss of hot work hardening, should negative effect the mechanical properties of pipe steel. However, taking into account the peculiarities of the chemical composition and structure of sheet pipe steels subjected to controlled rolling, containing hardly soluble fine particles of carbides and carbonitrides based on vanadium, niobium, titanium, which inhibit recrystallization, one can expect the preservation of a fine-grained structure and a part of hot work hardening with a rational scheme for manufacturing parts. The article presents data on the study of the structure and hardness of low-carbon low-alloy steel 10G2FBYu of strength class K60 after repeated normalization from temperatures of 850, 880, 910 and 940°C. Structural studies performed using metallographic and electron microscopes Carl Zeiss Axio Observer and JEOL JSM-7001F showed that after additional heating at the indicated temperatures, the grain sizes increase, but not significantly. The hardness of steel is reduced by 20% or less, depending on the normalization mode","PeriodicalId":429631,"journal":{"name":"Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139368422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pages of the enterprise chronicle ‒ engineering solutions","authors":"A. P. Laverchenko, V. G. Litvinov, V. E. Ryzhkov, A. Biryukov, V. A. Sidorov","doi":"10.32339/0135-5910-2023-5-406-414","DOIUrl":"https://doi.org/10.32339/0135-5910-2023-5-406-414","url":null,"abstract":"The history of the Makeevka Metallurgical Plant is considered on the examples of the most important and striking technical decisions made by the engineers of the enterprise within the framework of the blast furnace, open-hearth and rolling industries. With regard to blast furnace production following developments are noted: enlarged assembly of blast furnaces and auxiliary units; the launch in 1929 of the largest blast furnace in the USSR with a volume of 842 m3, which served as a prototype for the design and construction of large furnaces at other enterprises; achievement of the best indicators in the country in terms of the useful volume utilization factor; launch in 1957 of blast furnace No. 5 with a volume of 1400 m3, the largest at that time in the USSR; realization of industrial use of coke oven gas in blast-furnace production. With regard to open-hearth production following achievements are noted: the first experience in the USSR in mastering a floor filling machine; the complex of solutions that ensured victory in the All-Union competition of metallurgists for the best quality and low cost of products; leadership in the development of chromium-magnesite domes and evaporative cooling of furnace elements; establishing of the world record for steel smelting at a 200-ton unit. In the field of rolling production, the development of the first Soviet blooming is noted. The current struc-ture of the plant is presented, which is currently based on the production of wire and long products on unique aggre-gates: a wire mill 150 and long products rolling mill 390. The role of the Donetsk National Technical University in the training of engineering personnel for the Makeevka Metallurgical Plant, from 1921 to the present, is noted","PeriodicalId":429631,"journal":{"name":"Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information","volume":"127 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139368521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deforming 20K I-beam rolling in a universal mill and evaluation of different polar stresses level.","authors":"V. Rubtsov, D. A. Poluektov, O. I. Shevchenko, V. V. Tyuterev, R. I. Nuriev","doi":"10.32339/0135-5910-2023-5-367-374","DOIUrl":"https://doi.org/10.32339/0135-5910-2023-5-367-374","url":null,"abstract":"When rolling I-sections in universal mills, workpiece is captured by horizontal rolls, while vertical rolls in that time passive, but they are directly involved in reduction process. Studied literary sources describe effect of stresses on forces arising during rolling, as on impact resistance of vertical rolls rolling mills. However, issues of gripping and braking workpiece and effect of vertical rolls passive rotation on the quality characteristics of rolled products, including thickness variation, require more attention and detailed consideration. The results of simulation of rolling I-beam 20K1 in DEFORM-3D program are given, taking into account effect of vertical rolls passive rotation and its experimental rolling with further rolled product 3D scanning along 12 control sections. In course of modeling, influence of multipolar stresses arising in process of gripping workpiece on formed profile elements geometry was evaluated. It is shown that capture of strip occurs unevenly by right and left rolls. The vertical rolls do not rotate at moment of capture, which leads to formation of metal thickening at beginning of workpiece rolling. After their begin rotation, process stabilizes and metal begins to deform evenly along the wall, which leads to decrease in load on the vertical rolls. It has been established that uneven compression, both over cross section and along length of strip, leads not only to increased loads during I-beam rolling, but also to a change in geometric dimensions of section and curvature of strip. Adequacy of model is confirmed by high convergence of simulation results and production experiment","PeriodicalId":429631,"journal":{"name":"Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139368549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"History of blast furnace blowers.","authors":"G. S. Klyagin, А. B. Biryukov, V. A. Sidorov","doi":"10.32339/0135-5910-2023-5-415-430","DOIUrl":"https://doi.org/10.32339/0135-5910-2023-5-415-430","url":null,"abstract":"The development of blowers is inextricably linked with the stages of the history of technology and blast furnace production. The amount of blast is one of the main parameters of cast iron production, determining the size and performance of the blast furnace. Consideration of the issues of changing the design and drive of blowers starts from the natural draft and wedged leather bellows. The use of a horse-drawn drive or a water co-scaffold made it possible to increase the amount of air supplied to the furnace. The important event in the development of blowers was the advent of a steam engine, which made it possible to ensure industrial steel production in the middle of the XIX century. A fundamental change in the design of blowers occurred during the transition from reciprocating machines to centrifugal machines ‒ turboblowers powered by a steam turbine drive. Various design solutions of blowers of the transition period of the beginning of the XX century are considered, on the example of the technical equipment of the blower station of the Donetsk Metallurgical Plant (the plant of the Novorossiysk Society). Modern blower machine designs and characteristics are shown. It is noted that the cessation of the increase in the volume of created blast furnaces is associated with the achievement of the capacity limit of blowers. It is noted that in a number of cases, on the basis of technical and economic calculations, the possibility of obtaining a higher level of energy efficiency of the process of supplying blast to a blast furnace is substantiated when gas-tubine installations operating on blast-furnace gas are used to drive a turboblower. Some increase in the efficiency of the blast furnace process can be obtained, by considering the operation of a complex of devices: a turbo blower, an air heater, an air piping system.","PeriodicalId":429631,"journal":{"name":"Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information","volume":"238 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139368410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improvement of tool calibration in cold pilligrim rolling mill","authors":"M. V. Golovacheva, G. A. Orlov, M. A. Vedernikov","doi":"10.32339/0135-5910-2023-5-375-380","DOIUrl":"https://doi.org/10.32339/0135-5910-2023-5-375-380","url":null,"abstract":"In the manufacture of cold rolled tubes, the process performance of the rolling mill and the deformed metal is determined by tool calibration. The method of calibration calculation, the method and equipment of its reproduction significantly affect the deformability and quality of pipes, the cost of rolling tools, productivity, and in general the efficiency of cold (warm) rolling of pipes. Tool calibration is the distribution of individual compressions along the length of the working stroke of the rolls, determined by the shape and size of the grooves and the mandrel. The need to improve the calibration of rolling tools is determined by the ever-increasing requirements for pipe production products. In this article, it is proposed to set the function of relative reductions as a product of elementary functions. In the course of the work, the coefficients of the proposed function were determined from the condition of the minimum load on the gauge at the pre-calibration section to ensure the minimum longitudinal difference in the thickness of the pipes. Calibration and forces during rolling of stainless thin-walled pipes of size 95×2 mm by the improved method have been calculated using MS Excel. The force parameters of rolling, calculated using the improved method, are compared with the forces calculated using other well-known calibration calculation methods. It is shown that the proposed technique provides lower values of force on most of the crimping section, which allows reducing longitudinal variation of pipes and increasing durability of calibers. To assess the accuracy of rolled pipes, the calculation of the elastic deformation of the stand was carried out depending on the force in the pre-calibrating section. The calculated value shows that the proposed improved method of tool calibration allows rolling pipes of increased accuracy. The developed procedure involves the use of size 95×2 mm pipes made of 12X18H10T steel for rolling in order to produce from a two-pass scheme to a single-pass scheme while ensuring the required high cost of pipes.","PeriodicalId":429631,"journal":{"name":"Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139368466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study of the properties of the metal deposited with flux-cored wire of the Fe‒C‒Si‒Мn‒Сr‒W‒V system.","authors":"R. Kryukov, A. A. Usol’tsev, N. Kozyrev, A. V. Zhukov, N. Kibko","doi":"10.32339/0135-5910-2023-5-391-400","DOIUrl":"https://doi.org/10.32339/0135-5910-2023-5-391-400","url":null,"abstract":"Alloys of the Fe‒C‒Si‒Мn‒Сr‒W‒V system widely used for hot-rolling roll repairs provide high resistance of the deposited layer against abrasion, but its thermal endurance is relatively low. It is shown that in order to ensure the quality of roll repair, it is necessary to improve the composition of the flux-cored wire charge and the technology of their use. It is proposed to reduce the structural heterogeneity of the deposited metal the use of flux-cored wire of the type PP-Np-35V9X3SF. The influence of the introduction of carbon-fluorinated elements and titanium on hydrogen concentration, microstructure, level of pollution by non-metallic inclusions, grain size, hardness and rate of wear of the deposited metal layer was evaluated. The data on the chemical composition of the deposited layer, the content of non-metallic inclusions in it, the microstructure of the deposited metal, depending on the content of titanium in the flux-cored wire, are presented. It was found that an increase the concentration of titanium increases the hardness of the deposited layer and reduces the rate of wear (abrasion) of samples. The effect on the level of contamination of the studied fused layers with oxide inclusions was not revealed. Increasing the hydrogen content in the deposited layer re-duces its hardness and increases the rate of wear of the deposited layer. Increasing the content of titanium in the depos-ited layer helps to reduce the size of the martensite needles, as well as the size of the former austenite grain. The de-pendencies of HRC hardness and wear resistance on the content of titanium and hydrogen in the deposited layer were established","PeriodicalId":429631,"journal":{"name":"Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139368517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sludge conditioning after pipe-rolling mill aggressive sewage waters neutralization","authors":"N. Tsarev, E. M. Тат’yannikova, V. Mozgovoy","doi":"10.32339/0135-5910-2019-12-1392-1396","DOIUrl":"https://doi.org/10.32339/0135-5910-2019-12-1392-1396","url":null,"abstract":". Many sewage treatment facilities of metallurgical plants are physically obsolescent. Frequent practice is joint neutralization of spent pickling solutions (SPS) and rinsing waters (RW) by lime mortar followed by discharge of such “neutralized” aggressive sewage water in collectors of wastes. Therefore, implementation of modern equipment and technologies for cleaning of aggressive sewage water is an extremely actual task. The purpose of the work – to select a scientifically based type of flocculants and their optimal dozes for sludge, formed at the SPS and RW neutralization, processing. Results of the studies of flocculants processing of existing sewage treatment facilities (neutralization stations) sludge of one of pipe-producing plant of Ural quoted. Really formed sludge of two types were studied: the sludge after neutralization of pickling solutions and the sludge of rinsing water. In the course of the work, the effectiveness of application of high-molecular flocculants of cation, anion and non-ion types was estimated for conditioning of the sludge. As the criteria of the flocculants effectiveness the minimal time of capillary water suction from the processed by flocculants sludge, determined by special timer of capillary suction and chromatographic paper Whatman 17 Chr. As a result of the studies carried out, it was determined that for conditioning of a sludge of SPS neutralization, the non-ion flocculants Praestol 2500 (the doze 5 kg/t) was most effective. For a sludge of RW neutralization the anion flocculants Praestol 2540 (the doze 2 kg/t) was found to be most effective. After proposed flocculants, processing the sludge can be directed for concentration and mechanical dewatering. The conditioning of the sludge by flocculants will enable to increase the productivity of dewatering equipment.","PeriodicalId":429631,"journal":{"name":"Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114273903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}