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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

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. Source

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

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. Source

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

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. Source

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

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. Source

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

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. Source

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