Conclusions
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1.
In wire of high-carbon tool steel U10A intended for manufacturing sewing machine needles nonmetallic inclusions of two types are observed: globular and drawn-out in shape.
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2.
The inclusions have a complex composition and they are not pure graphite. They contain a high amount of carbon.
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Literature cited
G. A. Khasin, "Prevention of graphitizing for carbon tool steel", Stal', No. 1, 1020–1033 (1954).
E. Houdremont Special Steels, Vol. 1 [Russian translation], Metallurgiya, Moscow (1959).
A. A. Popov, "Effect of aluminum on graphitizing of tool steel", Stal', No. 2, 171–174 (1951).
Additional information
Leningrad Polytechnic Institute. Leningrad Institute of the Textile and Light Industries. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 11, pp. 59–61, November, 1990.
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Khoroshailov, V.G., Zhukova, L.T., Lashkova, E.G. et al. Nonmetallic inclusions in steel U10A wire. Met Sci Heat Treat 32, 881–883 (1990). https://doi.org/10.1007/BF00700074
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DOI: https://doi.org/10.1007/BF00700074