Plant Engineering and Facility Management Center

Plant, Japan

Plant Engineering and Facility Management Center

Plant, Japan

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Yamamura H.,Process Technology Center | Yamasaki N.,Plant Engineering and Facility Management Center | Kajitani T.,Technical Development Planning Div. | Mineta S.,Process Technology Center | Nakashima J.,Process Technology Center
Nippon Steel Technical Report | Year: 2013

The heat transfer phenomena in the mold and the strand of continuous casting machine were examined and control technologies were considered. The heat transfer phenomenon through the mold flux film in the mold was examined by the heat transfer measurement experimental apparatus. The cold model experiment that simulate the infiltration of mold flux and the numerical analysis model using the Reynolds equation was developed, and the mechanism of the mold flux infiltration that give the great influence to the heat transfer and the lubrication in the mold was considered. In addition, the mechanism of the hydrogen induced break out was clarified by measurement of the content of OH- radical in mold flux by 1H solid NMR device, and the countermeasures were considered. Furthermore, the FEM model which analyzed the deformation behavior of the solidification shell was developed, and the influence of the mold shape to uniformity of the solidification shell was studied. The numerical analysis model that simulate the behavior of the water in the secondary cooling of strand was developed using a particle method, and the influence of the leak water from the gap between the bearing of sprit roll and the cast slab and the stagnant water in the wedge-shaped space formed by the roll and the slab was examined.


Tani M.,Yawata Steel Works | Zeze M.,Yawata Steel Works | Toh T.,Mathematical Science and Technology Research Laboratory | Tsunenari K.,Plant Engineering and Facility Management Center | And 4 more authors.
Nippon Steel Technical Report | Year: 2013

In the electromagnetic casting (EMC) technique, an electromagnetic field is imposed by a solenoidal coil and a Lorentz force is generated at a meniscus. Consequently, a smooth cast surface without defects can be expected. So far concerning with EMC, the billet casting plant test, the slab casting bench scale test on pilot caster and the numerical simulation have been conducted. Finally the slab casting plant tests with the EMC technique were conducted. The castings were very stable and produced without any major difficulties. The qualities of slab cast were greatly improved by the EMC technique.


Horii K.,Chiyoda Corporation | Tsutsumi N.,Technical Development Planning Div. | Kitano Y.,Plant Engineering and Facility Management Center | Kato T.,Environment Research Laboratory
Nippon Steel Technical Report | Year: 2013

About 40 million tons of steel slag a year, which is the by-product of iron and steel manufacture, is generated in Japan and the almost all the slag is reused for the materials, e.g. cement raw material, road base course material and civil engineering material, by effectively utilizing its characteristics such as chemical components and mechanical properties. Most of its purposes of uses are to replace the functions of the newly mined raw materials from nature and promoting the use of steel slag is an effort to contribute to environmental conservation in this regard. On the other hand, due to the changes in social situation, supply-demand structure in the steel slag market is changing and Nippon Steel Corporation is developing the technologies to create new features of steel slag and to utilize them, especially in the field of Basic Oxigen Furnace (BOF) slag. In this report, the current production and sales status, processing and reusing technologies of BOF steelmaking slag are mentioned.


Harada T.,Nippon Steel & Sumitomo Metal Corporation | Hirata H.,Nippon Steel & Sumitomo Metal Corporation | Arai T.,Plant Engineering and Facility Management Center | Fukumura H.,Plant Engineering and Facility Management Center | And 3 more authors.
Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015 | Year: 2015

The closed type DC arc furnace was investigated as a smelt reduction furnace for reducing steelmaking slag, especially molten hot slag. The reduction capability and its characteristics in DC arc furnace were clarified through the experiments of slag reduction in closed type pilot scale DC arc furnace and in open type commercial scale DC arc furnace. For further comprehension of the reaction mechanism flow pattern in slag and metal phases was examined by numerical analysis. Moreover the effectiveness of using hot slag was shown by estimating the heat balance of the typical test operation using cold slag.


Haga T.,Plant Engineering and Facility Management Center | Katoh K.,Plant Engineering and Facility Management Center | Ibaraki T.,Ironmaking Technical Div.
Nippon Steel Technical Report | Year: 2012

High quality iron ore and coal resources for the steel industry are gradually being depleted. Given this problem, Nippon Steel Corporation has developed technologies to effectively utilize low quality resources. This paper focuses on coal drying methods (DAPS and SCOPE21) that enable the use of large quantities of non- or slightly-caking coals for cokemaking, the selective granulation of limonitic ores, and dust recycling using rotary hearth furnaces (RHF). It also describes the problems encountered during the initial investigation and commercial application of these methods and the measures taken to overcome these problems, as well as outlines some of the future prospects for these technologies. When coal is dried to less than 5% moisture, the pseudo-grains disintegrate, and the fine particles begin to act as individual grains, causing increased dust emissions. It thus became clear that, to suppress coal dust emissions, it was necessary to dry the coal to about 2% moisture so that the pseudo-grains would disintegrate completely; the resulting grains could then be classified by size, and the fine grains could be granulated.


Seto A.,A-D Technologies | Yamamoto T.,Plant Engineering and Facility Management Center | Yoshida Y.,A-D Technologies | Kanoko S.,A-D Technologies
Nippon Steel Technical Report | Year: 2013

Application of high strength steel sheets to automotive bodies requires evaluation technologies of fatigue and noise-and-vibration properties with high accuracy. Automobile partial models were used instead of real bodies for investigation of evaluation methods of those properties. Structural stress concentration parameters gave good estimation of fatigue lives to both of spot-welded and arc-welded models. New analysis methods were proposed for better understanding of vibration phenomena in lowand mid-frequency ranges using bonded models of panel-frame and two panels.


Goto K.,Plant Engineering and Facility Management Center | Hanagiri S.,Plant Engineering and Facility Management Center | Kohno K.,Plant Engineering and Facility Management Center | Matsui T.,Plant Engineering and Facility Management Center | Ikemoto T.,Plant Engineering and Facility Management Center
Nippon Steel Technical Report | Year: 2013

Efforts have been made to enhance refractory technology to support stable production of high-quality steel at low costs. This is true especially in the field of steelmaking, where refractories are used heavily. The service life of MgO-C bricks for converters has been extended by use of high-purity materials and new additives and the development of a low-graphite type excellent in spalling resistance. For secondary refining vessels and molten steel ladles, monolithic refractories have come to be used widely. In continuous casting, measures to prevent the clogging of submerged entry nozzles (SENs) have been developed on the basis of a study of its mechanisms, and anticorrosion material for the powder line of SEN has advanced. New refractory repair methods suitable for different applications, combined with diagnosis systems, have been developed to enhance the quality and accuracy of repair work.


Goto K.,Plant Engineering and Facility Management Center | Hanagiri S.,Plant Engineering and Facility Management Center | Kohno K.,Plant Engineering and Facility Management Center | Tsutsui Y.,Plant Engineering and Facility Management Center | Nitta M.,Plant Engineering and Facility Management Center
Nippon Steel Technical Report | Year: 2012

Refractory technology plays an essential role in the steel industry. Nippon Steel Corporation has strengthened the foundation for steel production by continuously reviewing and improving the development, selection, installation, maintenance and disposal of refractory materials with the perspective of a major user. Nippon Steel began to use carbon blocks as the refractory for blast furnace hearths in 1951. For good corrosion resistance and easy formation of a protective surface layer through cooling, a high thermal conductivity is essential for carbon blocks. Based on the examination of carbon blocks after use, appropriate measures were investigated and adopted to prevent penetration of molten iron into the blocks and to improve their corrosion resistance and thermal conductivity. Conventionally, the refractory materials for the inner lining of iron- and steelmaking facilities were mostly bricks of different kinds, but the use of monolithic refractories has increased due to advantages, such as energy and labor saving through the use of machines.


Oishi N.,Plant Engineering and Facility Management Center | Shia Y.,Plant Engineering and Facility Management Center | Kurisu Y.,Plant Engineering and Facility Management Center | Wada K.,Plant Engineering and Facility Management Center | Ishimori Y.,Plant Engineering and Facility Management Center
Nippon Steel Technical Report | Year: 2012

The underlying concept of equipment diagnosis technology is to build diagnostic logic by verifying the causal relation between the symptom of deterioration and the signal detected for each of the mechanical parts' elements. Sensors, signal processors, which are required for that purpose might seem to be combinations of technologies in the field of instrumentation. At Nippon Steel, however, the Mechanical Engineering Department has engaged itself in the development and assurance of those technologies, since equipment diagnosis technology is intended basically to monitor the operating condition, determine the mechanisms of deterioration, and manage the operational trends of mechanical equipment. The three-dimensional laser scanning method is also used in combination with FEM to speedily diagnose the yield strength of structural members whose thickness has been reduced by corrosion so as to prioritize repairs or renewal of damaged or obsolescent machines. The above technology has already been applied to many structures and outdoor machines.


Kawahito K.,Plant Engineering and Facility Management Center | Yamamoto Y.,Plant Engineering and Facility Management Center | Enokita T.,Plant Engineering and Facility Management Center | Ishii K.,Plant Engineering and Facility Management Center | Kanemori N.,Plant Engineering and Facility Management Center
Nippon Steel Technical Report | Year: 2012

The article describes the development history of civil engineering, building and water treatment technology at Nippon Steel Corporation since 1980. Relining a blast furnace affords a good opportunity to increase the capacity (inner volume) of the blast furnace, although it entails a decrease in output of hot metal during the relining work. From the standpoint of engineering, therefore, planning to expand the furnace inner volume at that time and reduce the duration of furnace relining is strongly preferred. In the steel production process, the boundary conditions change from moment to moment. Therefore, they often require a non-steady analysis. Besides, since the space to be analyzed is wide, the computing load is comparatively large. Today, however, numerical airflow analysis has become an indispensable tool in our studies to improve the working environment in plant buildings.

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