Improvement in the Resistance to Wear of Work-Rolls Used in Finishing Stands of the Hot Strip Mills

Work-rolls manufactured through the Indefinite Chill Double Poured (ICDP) method present an exterior work layer manufactured in a martensitic white cast iron alloyed with 4.5 %Ni, 1.7 %Cr, and 0.7 %Nb (wt.%). In its microstructure, there are abundant carbides of the type M<sub>3</sub>C a...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Alberto Cofiño-Villar, Florentino Alvarez-Antolin, Carlos Hugo Alvarez-Perez
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	hot strip mills white cast iron hot wear graphite Fe<sub>3</sub>C and NbC carbides Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/6bcb5be2094a4a2eb4450dce9bef5f55
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:6bcb5be2094a4a2eb4450dce9bef5f55
record_format	dspace
spelling	oai:doaj.org-article:6bcb5be2094a4a2eb4450dce9bef5f552021-11-25T18:22:34ZImprovement in the Resistance to Wear of Work-Rolls Used in Finishing Stands of the Hot Strip Mills10.3390/met111118732075-4701https://doaj.org/article/6bcb5be2094a4a2eb4450dce9bef5f552021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1873https://doaj.org/toc/2075-4701Work-rolls manufactured through the Indefinite Chill Double Poured (ICDP) method present an exterior work layer manufactured in a martensitic white cast iron alloyed with 4.5 %Ni, 1.7 %Cr, and 0.7 %Nb (wt.%). In its microstructure, there are abundant carbides of the type M<sub>3</sub>C and MC, which give high resistance to wear, and graphite particles which improve the service behaviour of the rolls against thermal cycling. The core of the rolls is manufactured in grey cast iron of pearlitic matrix and spheroidal graphite. These work-rolls are used in the finishing stands in Hot Strip Mills for rolling slabs proceeding from continuous casting at 1200 °C. Through the application of a Design of Experiments (DoE), an attempt has been made to identify those manufacturing factors which have a significant effect on resistance to wear of these rolls and to find an optimal combination of levels of these factors which allow for improvement in resistance to wear. To increase resistance to wear, it is recommended to situate, simultaneously, the liquidus temperature and the percentage of Si in the respective ranges of 1250–1255 °C and 1.1–1.15 (wt.%). Higher liquidus temperatures favour the presence of the pro-eutectic constituent rather than the eutectic constituent. The outer zone of the work layer, in contact with the metal sheet, which is being rolled, does not show the graphitising effect of Si (0.8–1.15 wt.%). On the contrary, it confirms the hardening effect of the Si in solid solution of the ferrite. The addition of 0.02% of Mg (wt.%) and the inoculation of 6 kg/T of FeB tend to eliminate the graphitising effect of the Si, thus favouring that the undissolved carbon in the austenite is found to form carbides in contrast to the majority formation of graphite.Alberto Cofiño-VillarFlorentino Alvarez-AntolinCarlos Hugo Alvarez-PerezMDPI AGarticlehot strip millswhite cast ironhot weargraphiteFe<sub>3</sub>C and NbC carbidesMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1873, p 1873 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hot strip mills white cast iron hot wear graphite Fe<sub>3</sub>C and NbC carbides Mining engineering. Metallurgy TN1-997
spellingShingle	hot strip mills white cast iron hot wear graphite Fe<sub>3</sub>C and NbC carbides Mining engineering. Metallurgy TN1-997 Alberto Cofiño-Villar Florentino Alvarez-Antolin Carlos Hugo Alvarez-Perez Improvement in the Resistance to Wear of Work-Rolls Used in Finishing Stands of the Hot Strip Mills
description	Work-rolls manufactured through the Indefinite Chill Double Poured (ICDP) method present an exterior work layer manufactured in a martensitic white cast iron alloyed with 4.5 %Ni, 1.7 %Cr, and 0.7 %Nb (wt.%). In its microstructure, there are abundant carbides of the type M<sub>3</sub>C and MC, which give high resistance to wear, and graphite particles which improve the service behaviour of the rolls against thermal cycling. The core of the rolls is manufactured in grey cast iron of pearlitic matrix and spheroidal graphite. These work-rolls are used in the finishing stands in Hot Strip Mills for rolling slabs proceeding from continuous casting at 1200 °C. Through the application of a Design of Experiments (DoE), an attempt has been made to identify those manufacturing factors which have a significant effect on resistance to wear of these rolls and to find an optimal combination of levels of these factors which allow for improvement in resistance to wear. To increase resistance to wear, it is recommended to situate, simultaneously, the liquidus temperature and the percentage of Si in the respective ranges of 1250–1255 °C and 1.1–1.15 (wt.%). Higher liquidus temperatures favour the presence of the pro-eutectic constituent rather than the eutectic constituent. The outer zone of the work layer, in contact with the metal sheet, which is being rolled, does not show the graphitising effect of Si (0.8–1.15 wt.%). On the contrary, it confirms the hardening effect of the Si in solid solution of the ferrite. The addition of 0.02% of Mg (wt.%) and the inoculation of 6 kg/T of FeB tend to eliminate the graphitising effect of the Si, thus favouring that the undissolved carbon in the austenite is found to form carbides in contrast to the majority formation of graphite.
format	article
author	Alberto Cofiño-Villar Florentino Alvarez-Antolin Carlos Hugo Alvarez-Perez
author_facet	Alberto Cofiño-Villar Florentino Alvarez-Antolin Carlos Hugo Alvarez-Perez
author_sort	Alberto Cofiño-Villar
title	Improvement in the Resistance to Wear of Work-Rolls Used in Finishing Stands of the Hot Strip Mills
title_short	Improvement in the Resistance to Wear of Work-Rolls Used in Finishing Stands of the Hot Strip Mills
title_full	Improvement in the Resistance to Wear of Work-Rolls Used in Finishing Stands of the Hot Strip Mills
title_fullStr	Improvement in the Resistance to Wear of Work-Rolls Used in Finishing Stands of the Hot Strip Mills
title_full_unstemmed	Improvement in the Resistance to Wear of Work-Rolls Used in Finishing Stands of the Hot Strip Mills
title_sort	improvement in the resistance to wear of work-rolls used in finishing stands of the hot strip mills
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/6bcb5be2094a4a2eb4450dce9bef5f55
work_keys_str_mv	AT albertocofinovillar improvementintheresistancetowearofworkrollsusedinfinishingstandsofthehotstripmills AT florentinoalvarezantolin improvementintheresistancetowearofworkrollsusedinfinishingstandsofthehotstripmills AT carloshugoalvarezperez improvementintheresistancetowearofworkrollsusedinfinishingstandsofthehotstripmills
_version_	1718411263624609792

Improvement in the Resistance to Wear of Work-Rolls Used in Finishing Stands of the Hot Strip Mills

Ejemplares similares