Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Development of Separation and Evaluation Technique of Non-metallic Inclusions in steel by Electron Beam Melting
Yoshio NURIKazusige UMEZAWA
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1989 Volume 75 Issue 10 Pages 1897-1904

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Abstract

In order to evaluate amount, size, shape and composition of Non-Metallic Inclusions (NMI) in metal quickly with high accuracy, an Electron Beam (EB) method was developed.
During melting of metal sample by EB, NMI floats on the top surface of the button-shape metal. Suitable irradiation energy which does not change the original form of NMI was made clear. The results by the present EB method were compared with those by conventional evaluation methods of NMI in metals, and this method was found equivalent to microscopic and oxygen analysis methods.
This method was applied to commercial grade steels, and it was found that the EB method was effective for various estimations in steel manufacturing, for example, for studying the effect of decrease of NMI during continuous casting, various phenomena by determining the size, shape and composition of NMI, and quality of ultra high purity metals. Especially, this method was of benefit to aluminum-killed steels.

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© The Iron and Steel Institute of Japan
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