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Tetsu-to-Hagané Vol. 96 (2010), No. 3

ISIJ International
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ONLINE ISSN: 1883-2954
PRINT ISSN: 0021-1575
Publisher: The Iron and Steel Institute of Japan

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Tetsu-to-Hagané Vol. 96 (2010), No. 3

Influence of Coking Pressure and Oven Age on Oven Wall Displacement and Coke Pushing Force

Tomoyuki Nakagawa, Yukihiro Kubota, Takashi Arima, Koichi Fukuda, Kenji Kato, Yasuhiko Awa, Masato Sugiura, Kenji Mitsugi, Kazuya Okanishi, Isao Sugiyama

pp. 101-106

Abstract

Relationship between coking pressure and displacement of oven wall during carbonization in coke oven was investigated at Muroran No. 6 coke oven battery (preheated-coal charging system). Determination was performed at both a superannuated oven chamber after 26 years from start and a sturdy oven chamber after a year from replacement of oven top, entire walls and oven sole. Wall displacement was observed when the internal gas pressure of plastic layer at oven center became the maximum in both oven chambers. The wall displacement increased in proportion to the internal gas pressure of plastic layer at oven center, and the displacement at superannuated oven per maximum gas pressure was larger than the one at sturdy oven. The pushing force (maximum electric current of pushing machine) greatly changed according to gas pressure of plastic layer at superannuated oven compared with the one at sturdy oven. It was concluded that the wall displacement by coking pressure greatly influences the pushing force of coke cake at superannuated oven chamber.

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Influence of Coking Pressure and Oven Age on Oven Wall Displacement and Coke Pushing Force

Effect of Microsegregation on Porosity Formation in High Cr Steel under Pressurized Atmosphere

Fumio Takahashi, Yoshikazu Momoi, Koji Kajikawa, Hitohisa Yamada

pp. 107-116

Abstract

The effect of microsegregation on porosity formation in high nitrogen steels containing high chromium under pressurized atmosphere was investigated using pressurized directional solidification furnace. In this study, it was successful to add over 0.70 mass% nitrogen in the ingot with no porosity. Nitrogen distributions in unidirectional solidification ingots were almost homogeneous regardless of the presence of porosities. In the case of low nitrogen content and peritectic solidification, porosities were observed inside the ingot solidified under nitrogen–argon gas mixture in the total pressure below certain critical value. In the case of high nitrogen content and austenitic solidification, porosity was not observed inside the ingot solidified under nitrogen gas condition. Liquidus and solidus temperature, equilibrium partition coefficient, solid fraction and temperature at peritectic transition, the relationship between solid fraction and temperature during solidification were calculated with Thermo-calc. The microsegregation tendency of nitrogen and alloying elements was simulated using Scheil equation and the modified method of Ohnaka's microsegregation model in this study. As a result of solidification simulation, in high chromium steel, it is suggested that supersaturated solution of nitrogen caused by bubble formation during solidification is likely to occur near the peritectic transition. Defined critical pressure of porosity formation in this study would be effective to determine the pressure conditions to manufacture high nitrogen steel.

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Effect of Microsegregation on Porosity Formation in High Cr Steel under Pressurized Atmosphere

Development of Technical Module of Erosion–Corrosion in Boiler Water for Carbon Steel

Kei Ito, Jun'ichi Sakai, Shigemitsu Kihara

pp. 117-122

Abstract

RBM (Risk Based Maintenance) that is a promising technique for the maintenance of aged industrial plants. The risk here is defined as likelihood by multiplication of consequence. Likelihood is decided by means of a technical module of each damage mechanism. In each technical module, there are some damage sensitivity prediction models for several environments. Technical module is needed to determine likelihood of failure, but currently, available technical module to evaluate likelihood is limited mainly for refinery and petrochemical plants. This study is targeting to construct exhaustive technical modules. As the first step, the technical module of erosion-corrosion that is strongly required from many industries is developed. In this paper, a new corrosion rate prediction model of erosion-corrosion is proposed based on published data and the modification is done using originally collected actual plant data. Finally, it is demonstrated that the new model is adequate to predict remaining life of the plant that is damaged by erosion corrosion.

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Development of Technical Module of Erosion–Corrosion in Boiler Water for Carbon Steel

Transformation Behavior of Ferrite at Steel/B1 Compounds Interface

Keiichiro Kasai, Chanjon Lee, Shoichi Nambu, Junya Inoue, Toshihiko Koseki

pp. 123-128

Abstract

We investigated the effect of B1 compounds on ferrite transformation during continuous cooling in C–Mn steel. TiO, TiN and MgO were employed as B1 compounds of similar lattice parameters to exclude the effect of lattice matching. Single-crystalline grains of the B1 compounds were hot-pressed with steel and embedded in austenite grains by subsequent reheating in austenite region, which were then cooled at 1K/s or 5K/s. Polygonal ferrite was found at all the interface of the three compounds similarly in the case of 1K/s cooling, where the Baker–Nutting (B–N) orientation relationship was well-identified between the ferrite and all the compounds. In the case of 5K/s cooling, ferrite formed from only some parts of the interface of MgO while still from the entire interface of TiO and TiN. The portion of ferrite developed from TiO without the B–N relationship increased, while such trend was not found in ferrite from TiN and MgO. First principle calculation suggests that interfacial energy is the lowest when the B1 compounds and ferrite lie with the B–N relationship, and the energies of the interfaces of TiN and TiO are lower than that of MgO. Increase in interfacial energy is significant for the interface of TiN without the B–N relationship, while negligible for the interface of TiO. Those results are explained by electron bonding behaviors at the interface between ferrite and the B1 compounds, and are well correlated with ferrite formation from the B1 compounds observed.

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Transformation Behavior of Ferrite at Steel/B1 Compounds Interface

Illustration of Flow, Stock and Recycling of Steel in Taiwan

Yowjia Hsueh, Yasuhiro Fukushima

pp. 129-137

Abstract

To strategically discuss how steel should be produced, used and recycled, understanding of current and future flow and stock of steel is of high importance. Because steel is used in the society for many years, records in the relevant industries including import and export from the past years are crucial as well as the current up-to-date statistics when illustrating flow and stock of steel in a year. Following the pioneering national flow and stock figures developed in Japan, this paper presents Taiwanese 2006 and 2007 versions of illustration of iron and steel flow, stock, and recycling, as well as list of data sources, estimation method for missing data, prediction method for the future flow and stock and recommendation for future refinement. The methodologies were modified basing on the Japanese method, due to differences in data availability, collection methods and social background of the data. Using a bottom-up approach, stock and obsolete scrap flows are estimated for three major household appliances, i.e. washing machine, refrigerator, and air conditioner. From comparison of the 2006 and 2007 versions, increasing importance of scrap materials in Taiwanese crude steel production and increase of importance of external market can be seen. Increasing the number of steel products covered by bottom up approach and its combination with top-down approach is recommended, as well as the refinement of assumptions from accumulating recorded data to increase completeness of the future versions.

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Illustration of Flow, Stock and Recycling of Steel in Taiwan

Numerical Simulation of Two-dimensional Meniscus Surface and Its Application to Estimation of Wetting Behavior between Solid Substrate and Melt

Yosuke Tatebayashi, Manabu Tange, Yasushi Shibuta, Minoru Ikeda, Toshio Suzuki, Itaru Jimbo

pp. 138-140

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Numerical Simulation of Two-dimensional Meniscus Surface and Its Application to Estimation of Wetting Behavior between Solid Substrate and Melt

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