Sumikin Iron and Steel Corporation

Wakayama-shi, Japan

Sumikin Iron and Steel Corporation

Wakayama-shi, Japan
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Ohno K.-I.,Kyushu University | Nishioka K.,Kyushu University | Nishioka K.,Nippon Steel & Sumitomo Metal Corporation | Munesue K.,Kyushu University | And 3 more authors.
ISIJ International | Year: 2012

When practical utilization of hydrogen in blast furnace will be tried, mass transfer behavior of hydrogen under the upward gas flow should be correctly understood. The purpose of this study is to clarify that diffusion behavior of several kinds of gases in air flow through packed bed in order to understand diffusion behavior of hydrogen in blast furnace. Cold model experiments at room temperature were carried out to investigate the diffusion behavior of He and CH 4 gases in air flow through the packed bed. Experimental results were analyzed by R. W. FAHIEN's method and following conclusion was obtained. Effect of molecular species difference on gas diffusion behavior was appeared clearer in the condition of smaller air flow velocity than bigger one from this comparison. In other words, gas diffusion behavior could ignore difference of molecular species under enough large gas flow condition. © 2012 ISIJ.


Miyazawa T.,Nippon Steel & Sumitomo Metal Corporation | Endo T.,Nippon Steel & Sumitomo Metal Corporation | Yamazoe H.,Sumikin Iron and Steel Corporation | Hamaogi K.,Nippon Steel & Sumitomo Metal Corporation
Iron and Steel Technology | Year: 2012

A new spike nozzle has been developed to prevent spitting even if oxygen blowing speed is increased, because inner pressure can be controlled by adjusting the gap between the spike and the nozzle opening. As a result, oxygen flowrate is increased and lower vessel life is extended.


Tsukaguchi Y.,Nippon Steel & Sumitomo Metal Corporation | Tsukaguchi Y.,Sumikin Iron and Steel Corporation | Hanao M.,Nippon Steel & Sumitomo Metal Corporation | Hanao M.,Sumikin Iron and Steel Corporation | And 6 more authors.
Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan | Year: 2011

Synopsis: Two characteristics, high basicity and high viscosity, are required for the anti-entrapment mould flux. However, it had been difficult to apply the high basicity and high viscosity mould flux for a round billet casting because of heat flux fluctuations in the mould. We supposed that the heat flux fluctuations were caused by unstable crystallization of the flux film between the mould and the solidified shell. Assuming that the contaminating constituents which do not compose the main crystal phase bring the unstable crystallization of the flux film, we have researched an adequate main crystal for the high basicity and high viscosity mould flux which has proper composition and melting point. As a result, there was no proper single crystal, but we have found an adequate combination of two crystals, gehlenite and akermanite. These two crystals have similar constructions each other to make a solid solution, melilite. Melilite behaves as a single phase crystal as well as it can take any compositions between gehlenite and akermanite. These properties of melilite diminish restraints on mould flux design. Consequently, we have successfully developed the anti-entrapment mould flux for the round billet casting, achieving a result to reduce mould flux defects effectively.


Yamaguchi Y.,Nippon Steel & Sumitomo Metal Corporation | Kamijo C.,Nippon Steel & Sumitomo Metal Corporation | Matsumura M.,Nippon Steel & Sumitomo Metal Corporation | Kawaguchi T.,Nippon Steel & Sumitomo Metal Corporation | And 3 more authors.
6th Int. Congress on the Science and Technology of Ironmaking 2012, ICSTI 2012 - Including Proceedings from the 42nd Ironmaking and Raw Materials Seminar, and the 13th Brazilian Symp. on Iron Ore | Year: 2012

In order to increase the permeability of the sintering bed for sinter ore productivity, the RF-Mebios (Return Fine - Mosaic Embedding Iron Ore Sintering) process, in which dry particles are added to granulated raw materials and then they are charged into a sintering machine, is proposed. In RF-Mebios, it is demonstrated by pot tests that sinter productivity increases at the same moisture content in sinter mixture at charging. This productivity increase is caused by higher permeability due to two major phenomena. One is by increasing the pseudo-particle size at granulation and the other is by decreasing the bulk density of the sinter packed bed after charging. The former is achieved by a higher moisture content in the raw materials at granulation. The latter is achieved by higher friction in the packed bed composed of dry and wet particle compounds. In the development of RF-Mebios, return fines were chosen as the dry particle because it is dry when produced by the sintering machine. The sinter productivity increases with the increase of the quantity of the return fines added after granulation. Moreover, RF-Mebios method is installed on three commercial sintering machines (Kashima, Wakayama, and Kokura) belonging to Sumitomo Metals. In all three sinter plants, increasing productivity has been confirmed. Therefore, introducing RF-Mebios has been demonstrated to cause a universal improvement of sinter productivity.


Adachi M.,Sumikin Iron and Steel Corporation | Murakata Y.,Sumikin Iron and Steel Corporation | Hanao M.,Nippon Steel & Sumitomo Metal Corporation | Tsukaguchi Y.,Nippon Steel & Sumitomo Metal Corporation | Kawamoto M.,Nippon Steel & Sumitomo Metal Corporation
AISTech - Iron and Steel Technology Conference Proceedings | Year: 2011

A high viscosity and high basicity mold flux has been successfully developed for the round billet caster at Wakayama steel works. This new mold flux effectively prevents blow hole defects with stable heat flux fluctuation. The stable heat flux fluctuation is achieved by the adoption of melilite crystal in the mold flux.


Tsukaguchi Y.,Nippon Steel & Sumitomo Metal Corporation | Hayashi H.,Sumikin Iron and Steel Corporation | Kurimoto H.,Japan Steel Works | Yokoya S.,KTH Royal Institute of Technology | And 2 more authors.
ISIJ International | Year: 2010

We began development of swirling-flow submerged entry nozzles in 1997 as a fundamental and effective measure for controlling the flow pattern in continuous casting molds. As a first step, we developed a swirling-flow submerged entry nozzle for round billet casting at the Wakayama works. We then began developing swirling-flow submerged entry nozzles for slab casting. The main purpose of the present work was to demonstrate that the formation of swirling flow in submerged entry nozzle improves productivity and the quality of products in continuous casting. We examined swirling-flow submerged entry nozzles with a swirl blade in these main bodies because such an arrangement is the easiest way to apply swirling flow to submerged entry nozzles in continuous casters without investment by facilities. We had only to change the submerged entry nozzle in the experiment. Swirling-flow submerged entry nozzles for slab casting were developed and their operation examined at the Wakayama and Kashima works. It was found that the proposed submerged entry nozzles increased the casting speed and improved the surface quality of slabs and steel sheets. © 2010 ISIJ.


Adachi M.,Sumikin Iron and Steel Corporation | Hayashi H.,Sumikin Iron and Steel Corporation | Hirata A.,Sumitomo Metal Ind. Ltd. | Okada N.,Sumitomo Metal Ind. Ltd. | Kawamoto M.,Sumitomo Metal Ind. Ltd.
SEAISI Quarterly (South East Asia Iron and Steel Institute) | Year: 2010

The low carbon steel slabs, which are supplied to other companies in large lot size, have been cast at the No.3 slab caster in Wakayama Steel Works since 2002. In order to increase the productivity of casting these high quality slabs, techniques to increase the casting sequences were investigated. As a result, electro magnetic brakes have been applied in the mold for the prevention of surface defects on the slabs in high speed casting. The sliding plate and the submerged nozzle have also been improved for the prevention of nozzle clogging. Due to these changes, the number of casting sequences have been increased dramatically.


Sato T.,Sumikin Iron and Steel Corporation | Adachi M.,Sumikin Iron and Steel Corporation | Hayashi H.,Sumikin Iron and Steel Corporation | Yamazoe H.,Sumikin Iron and Steel Corporation | Tani J.-I.,Sumikin Iron and Steel Corporation
SEAISI Quarterly (South East Asia Iron and Steel Institute) | Year: 2013

Synopsis: The advanced round billet casting technologies have been developed at Wakayama Steel Works. The round billet casting is efficient in comparison with bloom one, because round billets are directly supplied to seamless pipe mill without blooming (billeting or rolling) process. In the round-shaped billet, transverse surface cracks and centerline cracks tend to appear especially in case of low alloy steel containing Cr or Nb. As-casting billets could not be sent to seamless pipe mill directly because of these defects. Transverse cracks are caused because hot ductility of the low alloy steel remarkably deteriorates. These cracks were reduced by SSC (Surface Structure Control cooling), developed secondary cooling of the round billet caster. SSC prevented film-like ferrite of the round billet surface and improved surface ductility. The centerline cracks are caused by brittle ferrite structure at the billet center. By strong secondary cooling, equiaxed crystal zone ratio increased and centerline cracks could not get large. Applying these technologies, as-casting low alloy round billets could be sent to seamless pipe mill directly, and seamless pipe production was increased.


Kato R.,Sumikin Iron and Steel Corporation | Fujiwara M.,Sumikin Iron and Steel Corporation | Tahjiri Y.,Sumikin Iron and Steel Corporation | Fujiwara K.,Sumikin Iron and Steel Corporation
Steel Research International | Year: 2011

Sumikin Iron and Steel Corporation (SISC) is the main manufacturing base of seamless tube materials in Sumitomo Metals group, and stainless steel making plant is in charge of semi-manufactured special steel products such as stainless and high alloy steel. Total manufacturing costs of these special steels are heavily dependent on the price of raw material. Therefore, reduction of its usage and optimizing operation process in order to absorb influence of its unstable price are important issues. In this report, we introduce three cases as following: yield improvement in order to reduce raw material usage, optimization of the steel dust usage, and active use of low-price raw material through dividing refining process. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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