Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/111593
Title: Hydrogen Removal in Circulating Vacuum Degasser under Conditions of PJSC “NLMK”
Authors: Pleshivtsev, K. N.
Sheshukov, O. Y.
Metelkin, A. A.
Shevchenko, O. I.
Issue Date: 2021
Publisher: Pleiades journals
Allerton Press
Citation: Hydrogen Removal in Circulating Vacuum Degasser under Conditions of PJSC “NLMK” / K. N. Pleshivtsev, O. Y. Sheshukov, A. A. Metelkin et al. // Steel in Translation. — 2021. — Vol. 51. — Iss. 8. — P. 491-495.
Abstract: For high-quality steel smelting, stagebystage production is required, which has a complex of metallurgical units capable for producing products with high performance properties and low content of harmful impurities. One of the harmful impurities is hydrogen, so it is important to limit its content in the metal. To ensure the specified hydrogen content, the metal in the steel outoffurnace treatment at Converter Shop No. 2 (CS2) of PJSC “Novolipetsk Metallurgical Plant” (“NLMK”) is subjected to vacuum treatment in a circulating vacuum degasser. Despite the prevalence of circulating vacuum degassers, theoretically, mechanism of hydrogen removal in these metallurgical units has been insufficiently studied. To increase efficiency of hydrogen removal, theoretical calculations were performed to remove it from the metal. There are several mechanisms for hydrogen removing: direct transfer of hydrogen from metal to the surrounding space; formation of gas bubbles in metal and their direct ascent; nucleation of hydrogen bubbles at the border of refractory wall and metal; and removal of hydrogen by metal blowing with neutral gas (argon). It is shown that the main ways of hydrogen removal in a circulating vacuum degasser are direct transfer of hydrogen from metal to the surrounding space and blowing of melt with transporting gas. In the CS2 of PJSC “NLMK”, both ways are implemented at a circulating vacuum degasser. Vacuum pumps provide pressure in a vacuum chamber of less than 101.3 Pa (0.001 atm). It promotes intensive removal of hydrogen from the metal surface. To ensure circulation of metal, transporting gas argon is supplied to the inlet pipe of the RH degasser, which also takes part in removal of dissolved gases by transferring hydrogen to neutral gas bubbles. Additionally, performed calculations have shown that the main way of degassing in conditions of CS2 of PJSC “NLMK” is removal of hydrogen into the bubbles of carrier gas. © 2021, Allerton Press, Inc.
Keywords: CIRCULATING VACUUM DEGASSER
DEGASSING
HYDROGEN REMOVAL
OUTOFFURNACE STEEL TREATMENT
ARGON
BUBBLES (IN FLUIDS)
REFRACTORY MATERIALS
REFRACTORY METALS
CIRCULATING VACUUM DEGASSER
CONDITION
CONVERTER SHOP
DIRECT TRANSFER
HARMFUL IMPURITIES
HYDROGEN REMOVAL
METALLURGICAL UNITS
OUTOFFURNACE STEEL TREATMENT
STEEL TREATMENT
VACUUM DEGASSERS
DEGASSING
URI: http://hdl.handle.net/10995/111593
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85120845605
PURE ID: 29141315
ISSN: 0967-0912
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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