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THE RESEARCH OF NONMETALLIC INCLUSIONS IN VACUUM-DEGASSED AUSTENITIC STAINLESS STEEL BY THE METHOD OF SCANNING ELECTRON MICROSCOPY

https://doi.org/10.17073/0368-0797-2015-12-891-895

Abstract

The non-metallic phases in the two grades 08Cr18Ni10Ti and 03Cr18Ni10 of evacuated austenitic stainless steel have been investigated by scanning electron microscopy and EDX. The data on the composition of nonmetallic inclusions in the metal taken from the ladle, from vacuum treating machine and from CCM, as well as samples of cold rolled sheet of same metal of 1.2 mm thickness have been presented. It has been shown that in samples of 08Cr18Ni10Ti steel taken from CCM caster tundish, the non-metallic phase consists essentially of titanium nitride clusters, located within the crystals, which contain oxides of aluminum and titanium, as well as rare small globules coated with titanium oxides. The inclusions in cold-rolled sheet are arranged substantially over the entire crosssection and consist of small (5 ... 6 microns) titanium nitride crystals. Cast metal sample of titanium-free austenitic 03Cr18Ni10 steel are clean enough from nonmetallic inclusions. Non-metallic phase is represented mainly by small inclusions of calcium aluminium silicate. In the 1.2 mm thick cold-rolled sheet the non-metallic phase is represented extremely rarely by very small globules of 2...3 micron. Results of the present study have been compared with the known composition of non-metallic phase from non-evacuated similar steel grades at the same stage of processing.

About the Authors

O. K. Tokovoi
South Ural State University
Russian Federation

Dr. Sci. (Eng.), RANS Academician, Professor of the Chair of Physical Chemistry,

76, Lenina ave., Chelyabinsk, 454080


D. V. Shaburov
JSC “Chelyabinsk Metallurgical Plant”
Russian Federation

Cand. Sci. (Eng.), Head of Technical Department,

14, 2-ya Poveletskaya str., Chelyabinsk, 454047


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Review

For citations:

Tokovoi O.K., Shaburov D.V. THE RESEARCH OF NONMETALLIC INCLUSIONS IN VACUUM-DEGASSED AUSTENITIC STAINLESS STEEL BY THE METHOD OF SCANNING ELECTRON MICROSCOPY. Izvestiya. Ferrous Metallurgy. 2015;58(12):891-895. https://doi.org/10.17073/0368-0797-2015-12-891-895

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