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Tetsu-to-Hagané
Vol. 54 (1968), No. 6

Tetsu-to-Hagané Vol. 54 (1968), 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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Tetsu-to-Hagané Vol. 54 (1968), No. 6

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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

Abstract

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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Article Title

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

Bibtex

Ris

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

Tohei OTOTANI, Yasuzi KATAURA, Takashi SATO

pp. 673-678

Abstract

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

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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 Temperature Rise during Hot 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 Development of Cold-Rolling Textures in α-Iron

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On the Quench-Aging of Steel

Genjiro MIMA

pp. 691-709

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On the Quench-Aging of Steel

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Strength of Quenched and Tempered Structures of Steel

Tatsuro KUNITAKE

pp. 710-722

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Strength of Quenched and Tempered Structures of Steel

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抄録

pp. 723-727

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Tetsu-to-Hagané Vol. 54 (1968), No. 6

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Tetsu-to-Hagané Vol. 54 (1968), No. 6

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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

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On the Quench-Aging of Steel

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Strength of Quenched and Tempered Structures of Steel

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抄録

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Article Access Ranking

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

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Integrated Steelworks that Reduce CO2 Emissions by More Than 80% — Challenge for Carbon-Neutral Integrated Steelworks —

Factors affecting generation of iron fines in cold sheet rolling of steel

Effect of BN surface segregation on coatability in hot-dip galvanizing of B-added steel

Effects of alloying-element addition on hydrogen diffusion and hydrogen absorption in Ni

New Electromagnetic Flow Control System for Optimization of Molten Steel Flow in Continuous Casting Mold

Micromechanical characterization of nano-bainite steel

Experimental Study on Heat Transfer Characteristics of a Moving Single-Nozzle Jet Impingement

Surface Cracking in Hot Rolling Process of Cu Bearing Steel Bar

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