Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
STUDIES ON COMPOSITION AND PROCESS OF FORMATION OF NON-METALLIC INCLUSIONS IN STEEL INGOTS
Takeo AoTaneki Tokuda
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1958 Volume 44 Issue 12 Pages 1360-1365

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Abstract

The present report is an outcome of the results obtained during the study of the composition and process of formation of the so-called sand marks produced in steel ingots by thepresence of non-metallic substances. The results are summarized as follows:
1. Scum patches are produced by the corrosion and spalling of the runner bricks.
2. α-Alumina aggregates are produced by oxidization of the aluminum deoxidizer during formation of steel ingots by pouring. Such aggregates are never produced if aluminum is not used.
3. Non-metallic inclusions produced in bearing steel, when extracted by dissolving the steel with hot sulfuric acid, are found to consist mainly of Spinel and a little amount of α-Alumina and Quartz.

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© The Iron and Steel Institute of Japan
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