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Tetsu-to-Hagané
Vol. 108 (2022), No. 6

Tetsu-to-Hagané Vol. 108 (2022), No. 6

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

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Vol. 110 (2024)
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Tetsu-to-Hagané Vol. 108 (2022), No. 6

Reduction of CO₂ Emissions from Blast Furnace Applying Reactive Coke Agglomerate and Hydrogen Reduction

Hirokazu Yokoyama, Eiki Kasai, Masaaki Naitou

pp. 335-342

DOI:

10.2355/tetsutohagane.TETSU-2021-118

Abstract

The annual CO₂ emissions in Japan is approximately 1.1 Gt and the steel industry section accounts for its about 14%. The ratio of the blast furnace (BF) ironmaking process occupies about 70% of the emissions of the steel industry. Therefore, reduction of CO₂ emissions from the BF process is an important issue. In order to reduce CO₂ emissions from the BF, it is necessary to reduce its carbon consumption. Two plausible methods can be pointed out: One is the utilization of hydrogen as a reducing agent instead of carbon, and another is the improvement of the efficiency of CO gas reduction. It is effective to lower the reduction equilibrium point temperature of CO and CO₂ determined by the gasification start temperature of the carbonaceous materials for an increase in the efficiency of CO gas reduction. Utilization of the agglomerates prepared by the mixture of fine ore and fine coke, namely “Reactive Coke Agglomerate (RCA)” is also effective for a decrease in the reduction equilibrium point temperature.The purpose of this study is to clarify the effect of RCA utilization on the thermal reserve zone temperature and reduction efficiency under hydrogen enriched conditions. A series of the evaluation experiments was conducted using the Blast-furnace Inner-reaction Simulator (BIS). The results show that the use of RCA gives the effect to reduce CO₂ emissions from the blast furnace in the range of H₂ concentration of Bosh gas up to 20%.

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Reduction of CO₂ Emissions from Blast Furnace Applying Reactive Coke Agglomerate and Hydrogen Reduction

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Ris

Effects of Carbon Content and Austenite Grain Size on Retained Austenite Fraction in Stir Zone of Friction Stir Welded 6%Ni Carbon Steels

Takuya Miura, Hidetoshi Fujii, Kohsaku Ushioda

pp. 343-353

DOI:

10.2355/tetsutohagane.TETSU-2021-109

Abstract

Friction stir welding (FSW) was performed under the two welding conditions (rotation speed - traveling speed) of 150 rpm - 100 mm/min and 200 rpm - 400 mm/min using 6 mass%Ni steels with different carbon contents from 0.14 mass%C to 0.63 mass%C. The slightly lower peak welding temperature and the higher cooling rate were predicted under the condition of 200 rpm - 400 mm/min. The effects of carbon content and prior austenite grain size on retained austenite fraction in the stir zones were evaluated. When carbon content was 0.30 mass% or more, a fine microstructure consisting of lath martensite and retained austenite was formed in the stir zone. Irrespective of welding conditions, the amount of retained austenite increased with the increase of carbon content. More retained austenite was obtained at the stir zone under the 200 rpm - 400 mm/min condition, which resulted from rapid cooling and finer prior austenite grains compared with the condition of 150 rpm - 100 mm/min. The effect of the prior austenite grain size on the amount of retained austenite was successfully extracted, and the finer austenite grain size was concluded to play an important role to stabilize austenite by analyzing the difference in the martensitic start temperatures predicted based on the chemical composition and the retained austenite fraction based on Koistinen-Marburger equation.

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Effects of Carbon Content and Austenite Grain Size on Retained Austenite Fraction in Stir Zone of Friction Stir Welded 6%Ni Carbon Steels

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Extension of Treatable Area in Atmospheric-Pressure Plasma-Jet Nitriding

Ryuta Ichiki, Noritake Yagawa, Takashi Furuki, Seiji Kanazawa

pp. 354-359

DOI:

10.2355/tetsutohagane.TETSU-2021-124

Abstract

A unique nitriding technique using the atmospheric-pressure plasma jet has been upgraded by extending the treatable area. The previous manner to heat up a steel sample was spraying the thermal plasma jet onto the sample surface, which could maintain the treatment temperature only within a limited area of sample to restrict the treatable area to ca. 300 mm². Here, we first introduced an external heating system to the plasma-jet nitriding to control the treatment temperature of a larger sample. As a result, the treatable area is successfully extended to ca. 6300 mm². Moreover, the lifetime of NH radicals produced by the plasma chemical reaction is found to be long enough to cover the relevant area, implying the importance of NH for plasma-jet nitriding.

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Extension of Treatable Area in Atmospheric-Pressure Plasma-Jet Nitriding

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In-situ Measurement of Bainitic Transformation Process using Digital Holographic Microscope

Chengrong Lin, Kenji Sekido, Ho-Heok Kim, Junya Inoue

pp. 360-369

DOI:

10.2355/tetsutohagane.TETSU-2021-128

Abstract

A novel 3D in-situ measurement method was developed to clarify the bainitic transformation process of medium carbon steel. To achieve enhanced accuracy in 3D in-situ measurement by a digital holographic microscopy, the Gabor Wavelet transformation is introduced instead of the conventional reconstruction method based on the fast Fourier transformation. The effectiveness of the proposed method is first verified by comparison with the conventional reconstruction method as well as the other 3D measurement methods, such as atomic force microscopy and confocal laser microscopy. 3D in-situ observations were conducted to reveal the surface relief effect induced by the bainitic transformation behavior during continuous cooling. The results demonstrated that the measured shape deformation induced by the bainitic transformation corresponds well with the prediction by the phenomenological theory of martensite crystallography.

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In-situ Measurement of Bainitic Transformation Process using Digital Holographic Microscope

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Effects of Distributions of Constituent Phases on Mechanical Properties of C–Si–Mn Dual-phase Steel

Tatsuya Nakagaito, Takako Yamashita, Takeshi Yokota, Yoshihiro Terada, Masanori Kajihara

pp. 370-382

DOI:

10.2355/tetsutohagane.TETSU-2022-002

Abstract

Two kinds of ferrite were produced due to slow cooling after intercritical annealing, one being intercritically-annealed ferrite (α_a phase), and the other transformed ferrite (α_c phase). The effects of distributions of the α_a and α_c phases on the mechanical properties of a Fe–0.17C–1.5Si–1.7Mn dual-phase steel were examined experimentally at room temperature. Two types of intercritical annealing (IA) were conducted to control the distribution. The IA temperature and time are T_a = 800°C (1073 K) and t_a = 0.5 h (1.8 ks), respectively, for the first type, and T_a = 740°C (1013 K) and t_a = 4 h (14.4 ks), respectively, for the second one. For both types of IA, the steel was slowly cooled to 400°C (673 K) at a cooling rate of 10°C/s, followed by water quenching. While the total volume fraction fα of the α_a and α_c phases is close to 0.68–0.69 for both T_a = 800 and 740°C (1073 and 1013 K), the combination of the volume fraction of each α phase is different for T_a = 800 and 740°C (1073 and 1013 K). The volume fraction fα_a of the α_a phase and fα_c of the α_c phase is 0.33 and 0.36 for T_a = 800°C (1073 K), respectively, and 0.68 and 0 for T_a = 740°C (1013 K), respectively. The ultimate tensile strength s_u is about 970 MPa for fα = 0.68–0.69 independent of combination of fα_a and fα_c values. Thus, the effect of the α phase on s_u is close to each other between the α_a and α_c phases. In contrast, both the uniform strain e_u and the local strain e_l increase with increasing volume fraction fα_c of the α_c phase. Such increase in e_u is attributed to larger values of the strain hardening rate dσ/dε in the large strain region. Misfit strain stored at the boundary between the α_a and α_c phases causes to the larger values of dσ/dε. On the other hand, suppression of void formation deduces the increase in e_l. Acceleration of dynamic recovery of the α phase adjacent to martensite (M phase) and decrease in the hardness of the M phase adjacent to the α phase due to formation of the α_c phase can suppress void formation. Consequently, formation of the α_c phase contributes to improvement of the mechanical properties of the dual-phase steel.

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Effects of Distributions of Constituent Phases on Mechanical Properties of C–Si–Mn Dual-phase Steel

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Tetsu-to-Hagané Vol. 108 (2022), No. 6

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establishment of evaluation and prediction system of comprehensive state based on big data technology in a commercial blast furnace

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Tetsu-to-Hagané Vol. 108 (2022), No. 6

Reduction of CO2 Emissions from Blast Furnace Applying Reactive Coke Agglomerate and Hydrogen Reduction

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Effects of Carbon Content and Austenite Grain Size on Retained Austenite Fraction in Stir Zone of Friction Stir Welded 6%Ni Carbon Steels

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Extension of Treatable Area in Atmospheric-Pressure Plasma-Jet Nitriding

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In-situ Measurement of Bainitic Transformation Process using Digital Holographic Microscope

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Effects of Distributions of Constituent Phases on Mechanical Properties of C–Si–Mn Dual-phase Steel

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Contents

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Cover

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Editorial Board and Copyright Page

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Article Access Ranking

Interactions between interstitial and substitutional elements of solute diatomic and triatomic clusters in α-Fe from first-principles calculations

Effect of Wettability on Droplet Agglomeration in Two Immiscible Liquids

Thermodynamic Analysis on Slag/Metal Reactions in Steelmaking Process Using Direct Reduced Iron and Steel Scraps

The Crystal Structure of As-quenched Fe–C Martensite

Comparison between the Lüders and Portevin–Le Chatelier bands in the low-strain-rate tensile testing of ultralow-carbon ferritic steel

Molecular dynamics of solidification

Production of silicon by microwave heating

Large Eddy Simulation on Flow Structure in Centrifugal Flow Tundish

Basic Study on Flow Behavior of Molten Steel in a Continuous Casting Machine in the Presence of Static Magnetic Field Parallel to the Slab Width Direction

Attitude Control of a 2-wheel Satellite by Using a Time-State Control Form

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仁井谷冷却 camp-isij

Reduction of CO₂ Emissions from Blast Furnace Applying Reactive Coke Agglomerate and Hydrogen Reduction