For manufacturing billets for power generation equipment components with prolonged service life at elevated temperatures, especially pure steel 08Kh18N10T is required. The technology of melting steel grade 08Kh18N10T-VO with thorough vacuum decarburization makes it possible to prepare large forging ingots at 70°C above the liquidus temperature. A study of billet metal shows that titanium carbonitride and carbosulfide make up 85–100% of nonmetallic inclusions in steel grade 08Kh18N10T-VO. With sulphur content reduced from 0.006 to 0.0026%, the amount of carbosulfide decreases by a factor of seven. With a sulphur content of 0.0026% there is no extensive titanium carbosulfide (Ti4C2S2). The grain size in component workpieces corresponds to points 3–5 according to GOST 5639. Mechanical properties at 20 and 350°C are better than specified in technical documents.
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Translated from Metallurg, No. 7, pp. 72–76, July, 2017.
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Khlyamkov, N.A., Petrov, S.N., Berezhko, B.I. et al. Steel 08Kh18N10T-VO for Power Generation Equipment Components. Metallurgist 61, 585–590 (2017). https://doi.org/10.1007/s11015-017-0537-2
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DOI: https://doi.org/10.1007/s11015-017-0537-2