A disturbance dynamic evaluation method for steelmaking-continuous casting scheduling based on converter processing time prediction and disturbance influence process analysis
Xin Shao, Qing Liu, Bailin Wang, Tieke Li, Jiangshan Zhang
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オンライン版ISSN: | 1347-5460 |
冊子版ISSN: | 0915-1559 |
発行機関: | The Iron and Steel Institute of Japan |
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Xin Shao, Qing Liu, Bailin Wang, Tieke Li, Jiangshan Zhang
Ayano Yamamura, Hideyuki Yasuda, Tomohiro Takaki
Akinori Nakayama, Hodaka Aoki, Yutaka Yanaba, Kazuki Morita
Takumi Hoshika, Takayuki Iwama, Elizaveta Cheremisina, Ryo Inoue, Shigeru Ueda
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Oluwatosin Adekunle Aladejebi, Subhasish Mitra, Tejbir Singh, David J. Pinson, Sheng Chew, Tom Honeyands
Kento Nakanishi, Takumi Kami, Takehiro Sumita, Noritaka Saito, Kunihiko Nakashima
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Minami Maeda, Nobuo Uehara, Arinori Inagawa
Yasuo Takeichi, Yasuhiro Niwa, Reiko Murao, Masao Kimura
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Luca Chiari, Riki Mizukami, Tsukasa Nishiwaki
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Yue Tian, Hantao Hu, Zhigang Ma, Xiaofang Jiang, Hiroyuki Matsuura, Han Zhang, Ke Liu, Zhangfu Yuan
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ISIJ International Vol.65(2025), No.3
ISIJ International Vol.65(2025), No.3
Naibing Lyu, Yi Zhao, Shixin Xu, Tao Li, Jing Li, Jianqiao Hao
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ISIJ International Vol.65(2025), No.3
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ISIJ International Vol.65(2025), No.3
Raja Ankit Anand, Neelakantan Nurni Viswanathan, Manish Marotrao Pande
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Takumi Aibara, Masayoshi Kamai, Yoshiaki Morisada, Kohsaku Ushioda, Hidetoshi Fujii
Toshihiro Tsuchiyama, Ayumi Morimatsu, Tianze Ma, Yuxiong Zhou, Takuro Masumura
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ISIJ International Vol.65(2025), No.1
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Kazuhira Ichikawa, Yusuke Kashihara, Akinori Murao, Toshiyuki Hirosawa, Jun Ishii
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Naoto Yasuda, Hiroshi Mio, Kaoru Nakano, Kenichi Higuchi
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Qing Guo, Min Chen, Nan Wang, Lei Xu
Koki Momma, Daisuke Maruoka, Eiki Kasai, Taichi Murakami
Guang Wang, Zhi-wei Yang, Di Hao, Xu Wang, Jing-song Wang, Qing-guo Xue
Tongyuan Zhang, Shuang Liao, Hongmin Liu
Qiu Zheng, Tsuyoshi Furushima
Motomichi Koyama, Takahiro Sawaguchi
Kenichi Nakayama
Jiaheng Sui, Songtao Yang, Qi Wang, Changyu Sun, Xining Zhao, Dongpo Niu, Jiankang Huang
Yuki Tanaka, Ryohei Nishino, Kazunori Kamimiyada, Kohei Morishita, Hirofumi Miyahara
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ISIJ International Vol.65(2025), No.2
Benchao Su, Yuuki Mochizuki, Kenichi Higuchi, Naoto Tsubouchi
Norihiko L. Okamoto, Hayato Kobayashi, Tetsu Ichitsubo
Taichi Murakami, Yuki Motomura, Daisuke Maruoka, Kohei Sunahara, Takeshi Sato, Eiki Kasai
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鉄と鋼 早期公開
鉄と鋼 早期公開
鉄と鋼 Vol.111(2025), No.3
Taiki Iwanaga, Koki Terui, Kazuhira Ichikawa, Toshiyuki Hirosawa, Takashi Matsui, Tetsuya Yamamoto, Shungo Natsui, Hiroshi Nogami
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Yuewen Fan, Quan Yang, Hiroyuki Matsuura, Xiaojun Hu
Zhang Linfeng, Kazuhiro Matsugi, Zhefeng Xu, Yongbum Choi
Zhihua Ma, Kai Zeng, Bo Chen, Pengcheng Xiao, Liguang Zhu
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ISIJ International Vol.65(2025), No.2
ISIJ International Vol.64(2024), No.8
ISIJ International Vol.64(2024), No.8
Takumi Hoshika, Takayuki Iwama, Takashi Watanabe, Hirokazu Konishi, Ryo Inoue, Shigeru Ueda
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ISIJ International 早期公開
ISIJ International 早期公開
ISIJ International 早期公開
Koki Momma, Daisuke Maruoka, Eiki Kasai, Taichi Murakami
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ISIJ International 早期公開
ISIJ International 早期公開
ISIJ International Vol.65(2025), No.3
Ryusho Honda, Shungo Natsui, Jeong-In Kim, Hiroshi Nogami
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ISIJ International 早期公開
ISIJ International 早期公開
ISIJ International Vol.65(2025), No.3
Ryusho Honda, Shungo Natsui, Hiroshi Nogami
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ISIJ International 早期公開
ISIJ International Vol.65(2025), No.3
Yuri Sugiyama, Kenichi Takai
Peiyao Guo, Shiyan Jiao, Feichi Chen, Yi Min, Chengjun Liu
抄録
In order to analyze the structural behavior of Mg2+ in the slag and the difference of structural behavior with Ca2+, this paper examines the variation rule of microstructure of SiO2-CaO-Al2O3-MgO slag system with the increase of MgO/CaO ratio by molecular dynamics simulation. The results indicate that in the system, Mg2+ can exist can exist in three coordination forms when combined with oxygen: 4, 5, and 6. It can form ionic bonds with anions to exist as a network modifier, and it can also participate in network formation by forming [MgO4] tetrahedra through Mg-O covalent bonds. Under the condition of constant SiO2 and Al2O3 content, as the MgO/CaO ratio increases, the proportion of MgIV in the slag first increases and then decreases, with a turning point at 30.25%. In contrast, the MgVI ratio shows a decrease followed by an increase, with a minimum value of 17.33%. Ca2+ in the system mainly exists as a network modifier, and its modifying effect first decreases and then increases with the increase of MgO/CaO ratio. The stability of the Si-O and Mg-O tetrahedral structures changes little with the increase in Mg2+ content, while the stability of the Al-O tetrahedral structure decreases, and AlIV gradually transforms into higher coordinated Al. The content of bridge oxygen and the high polymerization degree structural units increase with the addition of Mg2+, leading to an increase in the melt polymerization degree.
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Behnaz Rahmatmand, Salman Khoshk Rish, Hannah Lomas, Lauren North, Tom Honeyands, Arash Tahmasebi
抄録
Introducing hydrogen gas into the blast furnace to partially substitute pulverised coal or coke, is a promising solution to decrease CO2 emissions of ironmaking process. However, increased H2O concentration alters the thermal and chemical conditions in the furnace, impacting the gasification reaction rate and degradation mechanism of coke. This research developed a modified random pore model (RPM) to integrate internal diffusion and interfacial chemical reaction processes, aiming to study reaction mechanisms and structural changes in coke under simulated conventional and H2-enriched blast furnace conditions. High-temperature thermogravimetric analysis was used to evaluate the gasification of coke lumps with varying initial quality. The experiments were performed isothermally between 1173-1473 K. Results indicated that coke reactivity in an H2-rich environment is up to 1.5 times higher than the conventional case. Moreover, low CRI coke exhibited a lower reaction rate in the H2-rich case, indicating the importance of coke quality for modified blast furnace operations. Modelling results showed that in the conventional blast furnace case, reactions occur more uniformly across the coke radius, indicating that chemical reaction is the dominant mechanism. In contrast, in the H2-rich blast furnace case, gas diffusion becomes the dominant rate limiting factor at higher temperatures (i.e., 1473 K), leading to higher mass loss near the coke surface and leaving a less-reacted core. These effects are more pronounced in low CRI coke due to its lower diffusivity coefficient. The results suggest that low CRI coke in an H2-rich blast furnace helps minimise coke degradation and maintain structural integrity.
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ISIJ International Vol.65(2025), No.3
ISIJ International Vol.65(2025), No.3
Zhenjie Zheng, Yasuaki Ueki, Ichiro Naruse
抄録
The efficiency of blast furnaces is adversely affected by coke degradation via gasification. Considering the utilization of hydrogen-enriched blast furnaces, it is essential to investigate the reaction and degradation behaviors of coke at different temperatures. In this study, coke gasification experiments were conducted under CO2 and H2O atmospheres at different temperatures to prepare cokes with a conversion ratio of 0.2. The reaction rate of the H2O gasification reaction was higher than that of the CO2 gasification reaction at the same temperature. The activation energies for CO2 and H2O gasification were 150.2 and 126.0 kJ/mol, respectively. After gasification, the shrinkage ratio was low by H2O gasification at 1273 K and increased with increasing temperature, indicating that the surface reaction became the control factor that consumed the coke matrix with increasing temperature. On the other hand, the shrinkage ratio by CO2 gasification tended to be stable from 1273 to 1673 K. Furthermore, the increase in the porosity of coke by H2O gasification was lower than that by CO2 gasification at higher temperatures. In addition, the strength of the coke via H2O gasification was higher than that of the coke via CO2 gasification.
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ISIJ International 早期公開
ISIJ International Vol.65(2025), No.3
ISIJ International Vol.65(2025), No.3
Qiang Li, Jing Song Wang, Guang Wang, Xue Feng She, Qing Guo Xue, Hai Bin Zuo
抄録
Blast furnace blowing break and re-blowing is a regular operation in the smelting process, However, some blast furnace conditions fluctuate for a long time due to improper operation of blast furnace blowing break and re-blowing, and preventing rapid attainment of production capacity. This paper first analyzes the influence of hydrogen-rich on the cohesive zone. Subsequently, it simulates the conditions of ferrous burden during partial and complete tuyere blowing break under hydrogen-rich conditions, followed by re-blowing. The study explores the influence of these operational changes on the softening and melting behaviors of the ferrous burden. The results indicate that with a 10% hydrogen enrichment, the melting range of ferrous burden narrows and shifts to higher temperatures, improving the permeability of the burden. During partial tuyere blowing break, this promotes the reduction of the ferrous burden and the carburization of metallic iron, increasing the melting start temperature and decreasing the dropping temperature by 29°C, thereby narrowing the cohesive zone. Both maximum pressure difference (ΔPmax) and permeability index (S) values decrease. In contrast, with a complete tuyere blowing break, the dropping temperature of the ferrous burden gradually increases from 1459°C to 1478°C as the isothermal duration extends, widening the melting interval and leading to an increase in both ΔPmax and S values.
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ISIJ International Vol.64(2024), No.14
ISIJ International Vol.64(2024), No.14
ISIJ International Vol.65(2025), No.2
Kento Nakanishi, Takumi Kami, Takehiro Sumita, Noritaka Saito, Kunihiko Nakashima
抄録
Gas permeability in a blast furnace is maintained via a layered structure comprising iron ore and a coke bed. High temperatures may induce a breakdown of this layered structure, and hence, an understanding of the transition from solid-like deformation to liquid-like deformation is crucial for preventing the breakdown. In this study, the flow behavior analogous to that of a layered structure comprising iron ore and a coke bed with derived melts was examined using polyethylene beads and silicone oil. Oscillation and creep tests were conducted on analogous samples of polyethylene beads and silicone oil with viscosities similar to that of the slag melt. The samples were prepared by mixing at liquid-phase to solid-phase volume ratios of 10/90, 25/75, and 40/60. Air was present in the samples used herein. The transition between the solid-like and liquid-like flow was investigated via oscillation testing, and the flow behavior on long timescales was investigated via creep testing. The results of oscillation testing indicated that a larger strain is required for flow at an intermediate liquid fraction or greater liquid viscosity. The results of creep testing revealed that the sample deformation changes from decelerating to accelerating as the applied stress increases at higher or lower liquid-phase fractions. In contrast, at an intermediate liquid fraction, the sample deformation decelerated at a relatively higher stress. The number of liquid bridges may be the highest at an intermediate liquid fraction, and the force between the particles generated by the liquid bridges is expected to be the most significant.
Kento Nakanishi, Takehiro Sumita, Noritaka Saito, Kunihiko Nakashima
抄録
Knowledge of the viscoelastic properties of suspensions is essential for many industrial processes. Although oscillation and creep testing are widely used to measure the viscoelastic properties of complex fluids, few studies on the correlation between the viscoelastic properties measured using these methods have been published. This study aims to provide insights into the differences between these methods and determine which method is better suited for a particular application. The room-temperature viscoelastic properties of a suspension composed of polyethylene beads dispersed in a silicone oil matrix were measured by oscillation and creep testing and compared. The results of oscillation testing indicated that the suspension showed weakly elastic deformation, whereas the results of creep testing revealed that the suspension was relatively elastic, with the liquid phase showing lower viscosity. In addition, the viscosity measured by oscillation testing was lower than that measured by creep testing. When the imposed flow causes microstructural changes, such as when the shear flow and particle‒particle contact induce aggregation, the analyzed flow property considerably differs between testing methods.
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ISIJ International Vol.64(2024), No.11
ISIJ International Vol.64(2024), No.11
ISIJ International Vol.64(2024), No.11
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