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ISIJ International Advance Publication

ISIJ International
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Grid List Abstracts
ONLINE ISSN: 1347-5460
PRINT ISSN: 0915-1559
Publisher: The Iron and Steel Institute of Japan

Backnumber

  1. Vol. 65 (2025)

    1. No.3
    2. No.2
    3. No.1

  2. Vol. 64 (2024)

    1. No.15
    2. No.14
    3. No.13
    4. No.12
    5. No.11
    6. No.10
    7. No.9
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    13. No.3
    14. No.2
    15. No.1

  3. Vol. 63 (2023)

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    2. No.11
    3. No.10
    4. No.9
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    6. No.7
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  4. Vol. 62 (2022)

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  5. Vol. 61 (2021)

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    5. No.8
    6. No.7
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  6. Vol. 60 (2020)

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    5. No.8
    6. No.7
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  7. Vol. 59 (2019)

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    6. No.7
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  8. Vol. 58 (2018)

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  9. Vol. 57 (2017)

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  10. Vol. 56 (2016)

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    3. No.10
    4. No.9
    5. No.8
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  11. Vol. 55 (2015)

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    3. No.10
    4. No.9
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    6. No.7
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  12. Vol. 54 (2014)

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    3. No.10
    4. No.9
    5. No.8
    6. No.7
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    12. No.1

  13. Vol. 53 (2013)

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    3. No.10
    4. No.9
    5. No.8
    6. No.7
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    8. No.5
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    12. No.1

  14. Vol. 52 (2012)

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    3. No.10
    4. No.9
    5. No.8
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    12. No.1

  15. Vol. 51 (2011)

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    3. No.10
    4. No.9
    5. No.8
    6. No.7
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    12. No.1

  16. Vol. 50 (2010)

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    3. No.10
    4. No.9
    5. No.8
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    12. No.1

  17. Vol. 49 (2009)

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    3. No.10
    4. No.9
    5. No.8
    6. No.7
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    12. No.1

  18. Vol. 48 (2008)

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    3. No.10
    4. No.9
    5. No.8
    6. No.7
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    8. No.5
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  19. Vol. 47 (2007)

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    3. No.10
    4. No.9
    5. No.8
    6. No.7
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    8. No.5
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    12. No.1

  20. Vol. 46 (2006)

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    3. No.10
    4. No.9
    5. No.8
    6. No.7
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    8. No.5
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  21. Vol. 45 (2005)

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  22. Vol. 44 (2004)

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  23. Vol. 43 (2003)

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  24. Vol. 42 (2002)

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  25. Vol. 41 (2001)

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    3. No.10
    4. No.9
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    6. No.7
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  26. Vol. 40 (2000)

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    3. No.10
    4. No.9
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    6. No.7
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  27. Vol. 39 (1999)

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  28. Vol. 38 (1998)

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  29. Vol. 37 (1997)

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  30. Vol. 36 (1996)

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  31. Vol. 35 (1995)

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  32. Vol. 34 (1994)

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  33. Vol. 33 (1993)

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  34. Vol. 32 (1992)

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  35. Vol. 31 (1991)

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  36. Vol. 30 (1990)

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  37. Vol. 29 (1989)

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    5. No.8
    6. No.7
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Hydrogen embrittlement phenomena from incubation stage to fracture associated with strain-induced vacancy-hydrogen complexes in iron

Yuri Sugiyama, Kenichi Takai

DOI:

10.2355/isijinternational.ISIJINT-2024-384
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Hydrogen embrittlement phenomena from incubation stage to fracture associated with strain-induced vacancy-hydrogen complexes in iron

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Molecular Dynamics Analysis of the Mg2+ Structure Behavior in SiO2-CaO-Al2O3-MgO Slag System

Peiyao Guo, Shiyan Jiao, Feichi Chen, Yi Min, Chengjun Liu

DOI:

10.2355/isijinternational.ISIJINT-2024-286

Abstract

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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Molecular Dynamics Analysis of the Mg2+ Structure Behavior in SiO2-CaO-Al2O3-MgO Slag System

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Reaction-diffusion kinetics modelling of coke gasification in simulated H2 reduction blast furnace

Behnaz Rahmatmand, Salman Khoshk Rish, Hannah Lomas, Lauren North, Tom Honeyands, Arash Tahmasebi

DOI:

10.2355/isijinternational.ISIJINT-2024-300

Abstract

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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Reaction-diffusion kinetics modelling of coke gasification in simulated H2 reduction blast furnace

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Effect of temperature on reaction and degradation behaviors during CO2 and H2O gasification reactions of coke in same conversion ratio

Zhenjie Zheng, Yasuaki Ueki, Ichiro Naruse

DOI:

10.2355/isijinternational.ISIJINT-2024-344

Abstract

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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Effect of temperature on reaction and degradation behaviors during CO2 and H2O gasification reactions of coke in same conversion ratio

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Softening and Melting Behavior of Ferrous Burden in Hydrogen-rich Blast Furnace Blowing Break and Re-blowing

Qiang Li, Jing Song Wang, Guang Wang, Xue Feng She, Qing Guo Xue, Hai Bin Zuo

DOI:

10.2355/isijinternational.ISIJINT-2024-247

Abstract

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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Softening and Melting Behavior of Ferrous Burden in Hydrogen-rich Blast Furnace Blowing Break and Re-blowing

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Transition behavior of gas containing suspension from solid-like to liquid-like flows

Kento Nakanishi, Takumi Kami, Takehiro Sumita, Noritaka Saito, Kunihiko Nakashima

DOI:

10.2355/isijinternational.ISIJINT-2024-223

Abstract

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.

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Transition behavior of gas containing suspension from solid-like to liquid-like flows

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Comparison of the viscoelastic properties and viscosity of suspensions determined by oscillation and creep testing

Kento Nakanishi, Takehiro Sumita, Noritaka Saito, Kunihiko Nakashima

DOI:

10.2355/isijinternational.ISIJINT-2024-078

Abstract

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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Comparison of the viscoelastic properties and viscosity of suspensions determined by oscillation and creep testing

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