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鉄と鋼
Vol. 54 (1968), No. 6

鉄と鋼 Vol. 54 (1968), No. 6

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オンライン版ISSN:	1883-2954
冊子版ISSN:	0021-1575
発行機関:	The Iron and Steel Institute of Japan

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キーワードランキング

22 Dec. (Last 30 Days)

鉄と鋼 Vol. 54 (1968), No. 6

随想

中谷文忠

pp. 641-642

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The Effect of Ingot Size and Capping Time on the Distribution, Composition and Type of Non-Metallic Inclusion in Large Rimming Ingots

Koichi ASANO, Tetsuro OHASHI, Yoshio NURI

pp. 643-672

抄録

The following results have been obtained through the study made on the subject.
(1) Large non-metallic inclusions distribute mainly at the bottom part of an ingot. Whose compositions are (Fe, Mn) O, MnO-Al₂0₃ and Mn-Silicate. From the fact that larger inclusions have less value of MnO/FeO, coming closer to the composition of scum, it is estimated that large inclusionsstem partially from scum through rimming action. Since Ca is detected in the aluminate and silicate, they are considered to have origin in slag, refractory and deoxidation products.
(2) With the “ingot parameter” Y-which is defined as ingot width/ingot thickness+0.02 (ingot height-width), relations between ingot dimensions and inclusion distribution and its composition can be clearly shown: when Y becomes bigger, total amount of inclusions and amount of large inclusions (more than 100μ) increase and the inclusions have less value of MnO/Fe0.
The parameter Y is considered to have some relationship with thickness of viscous laver at the bottom part of ingot and with state of flow of rimming steel in the mold. Y therefore, is a good index to explain conditions of scum movement along rimming action, scum trap and precipitation of (Fe, Mn) O.
(3) With shorter capping time, increase in total amount of inclusion is observed, but the amount of large inclusions decreases.
This result is explained as follows:
When capping time becomes shorter, more oxygen, which would be otherwise eliminated through rimming action as CO, remains to react with iron and manganese which results in higher amount of nclusion.
Growth of inclusions is hindered as rimming action is terminated earlier, which results in less amount of large inclusions.

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Identification of σ-Phase in 25Cr-20Ni Heat-Resistant Cast Steel

Tohei OTOTANI, Yasuzi KATAURA, Takashi SATO

pp. 673-678

抄録

Some experiments were carried out by means of X-ray diffraction, electrolytic isolation and potentiostatic etching technique, in order to make clear the relation between precipitated carbides and σ-phase in 25Cr-20Ni heat-resistant cast steel.
The results obtained were summarized as follows:
(1) When electrolytic residues contain more than 5wt% of σ-phase, it can be identified by X-ray diffraction method.
(2) For the electrolytic isolation of σ-phase, 45wt% FeCl₃ aq. solution showed a favourable result as compared with 10vol% HCl-C₂H₅OH solution.
(3) Not only M₇C₃ is distinguishable from M₂₃C₆ carbide but also σ-phase from M₂₃C₆ by means of potentiostatic etching in 10 n-NaOH solution. At 200mV vs. Hg-HgO reference electrode M₂₃C₆ carbide is etched more rapidly than M₇C₃ carbide or σ-phase, at 500mV M₂₃C₆ and M₇C₃ carbides, or M₂₃C₆ and σ-phase are simultaneously etched, and at 600mV, σ-phase etched most rapidly.
(4) From these investigations it was found that σ-phase may be possible to precipitate even in the prolonged heat treated cast steel containing 0.35% carbon.

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On the Temperature Rise during Hot Rolling

Isao KOZASU, Hiroyuki KUBOTA

pp. 679-680

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The temperture rise due to hot rolling was qualitatively evaluated by rolling plates with inserted thermocouples. In rolling at high reductions, thermocouples were shortcircuited by oxidation scale in the vicinity of the junction. However, this was found to exert no influence on temperature readings.
The temperature rise ranged between 10°C and 45°C for the conditions studied (1150-800°C, 10-40% reduction), and showed a better correlation with mean flow stress rather than with amount of plastic work in rolling.

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On the Development of Cold-Rolling Textures in α-Iron

Taichi KAMIJO

pp. 681-690

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[in Japanese]

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On the Quench-Aging of Steel

Genjiro MIMA

pp. 691-709

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Strength of Quenched and Tempered Structures of Steel

Tatsuro KUNITAKE

pp. 710-722

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pp. 723-727

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22 Dec. (Last 30 Days)

Wettability of CaS against molten iron at 1873 K

ISIJ International 早期公開
凝固過程における溶鋼中からAl₂O₃上へのMnSの晶出挙動

鉄と鋼早期公開
Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO₂-H₂ Mixed Gas

ISIJ International 早期公開
Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

ISIJ International 早期公開
In-situ Observation of Precipitation and Growth of MnS Inclusions during Solidification of a High Sulfur Steel

ISIJ International Vol.64(2024), No.14
モデル材料を用いた凝固過程における介在物生成挙動のその場観察

鉄と鋼早期公開
Evaluation method for the three-dimensional behavior of bubbles in a liquid metal under horizontal magnetic field using ultrasonic tomography

ISIJ International 早期公開
Effect of Heating Rate on the Non-Isothermal Hydrogen Reduction of Hematite Pellets

ISIJ International 早期公開
Effects of Manganese on Microstructure and Work-hardening Behavior of Low-carbon Lath Martensitic Steel

ISIJ International 早期公開
Chemical and Mechanical Factors on Phosphorus Dissolution Behavior from P-concentrated Slag

ISIJ International Vol.64(2024), No.14

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鉄と鋼 Vol. 54 (1968), No. 6

キーワードランキング

hydrogen reduction of iron ore

gasification

characterization of coal and biomass based on kinetic parameter distributions for pyrolysis

kinetics of decarburization of liquid iron with high concentration ofcarbon

mechanisms of liquefaction and pyrolysis reaction of biomass

hydrogen reduction

steel

19al6mg

automotive wheel

deguchi

鉄と鋼 Vol. 54 (1968), No. 6

随想

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The Effect of Ingot Size and Capping Time on the Distribution, Composition and Type of Non-Metallic Inclusion in Large Rimming Ingots

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Identification of σ-Phase in 25Cr-20Ni Heat-Resistant Cast Steel

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On the Temperature Rise during Hot Rolling

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On the Development of Cold-Rolling Textures in α-Iron

SNSによる共有

On the Quench-Aging of Steel

SNSによる共有

Strength of Quenched and Tempered Structures of Steel

SNSによる共有

抄録

SNSによる共有

論文アクセスランキング

Wettability of CaS against molten iron at 1873 K

凝固過程における溶鋼中からAl2O3上へのMnSの晶出挙動

Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO2-H2 Mixed Gas

Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

In-situ Observation of Precipitation and Growth of MnS Inclusions during Solidification of a High Sulfur Steel

モデル材料を用いた凝固過程における介在物生成挙動のその場観察

Evaluation method for the three-dimensional behavior of bubbles in a liquid metal under horizontal magnetic field using ultrasonic tomography

Effect of Heating Rate on the Non-Isothermal Hydrogen Reduction of Hematite Pellets

Effects of Manganese on Microstructure and Work-hardening Behavior of Low-carbon Lath Martensitic Steel

Chemical and Mechanical Factors on Phosphorus Dissolution Behavior from P-concentrated Slag

詳細検索

凝固過程における溶鋼中からAl₂O₃上へのMnSの晶出挙動

Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO₂-H₂ Mixed Gas