Melting of complex austenitic-ferritic steel of grade EI654-Sh (15Kh18N12S4TYu-Sh) with rigid limitation of the ferrite content, due to customer specification, is difficult as a result of the lack of phase composition monitoring and unstable assimilation of aluminum, silicon, and titanium. A new production scheme has been developed in order to improve the prescribed composition of the steel with respect to Si, Al, and Ti, i.e., a triplex process using steel melting units of extra-furnace refining EAF → VTU → CSTU. The final treatment in the CSTU makes it possible to perform extreme adjustment of chemical composition (within limited narrow concentration ranges) and to provide the minimum chromium-nickel equivalent. The set of production measures for optimizing chemical composition of the steel and metal heating temperature for forging provides fulfilment of an order for steel EI654-Sh with a ferrite grain size at point 3 of the scale.
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References
I. Ya. Sokol, Two-Phase Steels [in Russian], Metallurgiya, Moscow (1974).
V. D. Potapov and A. A. Zubareva, “Improvement of production technology for the 15Kh18N12S4TYu-Sh steel,” Stal, No. 7, 73–76 (1985).
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Translated from Metallurg, No. 4, pp. 50–52, April, 2011.
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Burgacheva, O.B., Shelgaev, Y.N., Kostyleva, N.V. et al. Production of steel of grade EI654-Sh with a limitation of the ferrite content. Metallurgist 55, 251 (2011). https://doi.org/10.1007/s11015-011-9419-1
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DOI: https://doi.org/10.1007/s11015-011-9419-1