Improvement of the technological process of manufacturing bearing grades of steel at the 370/150 mill.

Puteev, V. S.; Savchenko, S. A.; Pankovets, I. A.; Voznaja, V. I.; Астапенко, И. В.

doi:10.21122/1683-6065-2021-3-65-73

Litʹë metall.

2021

DOI: 10.21122/1683-6065-2021-3-65-73

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Improvement of the technological process of manufacturing bearing grades of steel at the 370/150 mill.

V. S. Puteev¹,

S. A. Savchenko²,

I. A. Pankovets³

et al.

Abstract: The actual problem of obtaining long products from bearing steel grades with specified microstructure characteristics is considered. The analysis of the capabilities of the existing equipment – a heating furnace and a rolling mill 370/150 of OJSC “BSW – Management Company of the Holding “BMC” was carried out in order to introduce technical measures aimed at reducing carbide heterogeneity in products made of bearing steel grades on the example of steel grade 100Cr6.The influence of different modes of preliminar… Show more

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Development of technology and development of production of reinforcement no. 6 of strength class A500S form 2f in coils according to the requirements of GOST 34028–2016

Savchenko,

Volosovich,

Kuchkov

et al. 2024

Litʹë metall.

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The article presents the results of research on the development and mastery of the technological process of rolling reinforcement in coils with a nominal diameter of 6 mm of strength class A500C of a double‑sided periodic profile of the 2f form, ensuring the required mechanical properties, improving complex quality indicators based on improving the chemical composition and technological modes of two‑stage cooling on the Stelmor line taking into account its cooling and transporting abilities. A method of hot rolling of reinforcement with a double‑sided crescent (2f) profile is proposed; technological factors influencing the strength, plastic and operational properties of reinforcing bars through the formation of its effective microstructure are considered. The chemical composition of steel was proposed and modes of thermomechanical hardening of reinforcement with rolling heating were developed, providing high consumer properties. The results of mechanical tests of rolled reinforcing bars in coils and comparative data on the mechanical properties and geometric parameters of the reinforcement are also presented.

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Development of technology and development of production of reinforcement no. 6 of strength class A500S form 2f in coils according to the requirements of GOST 34028–2016

Savchenko,

Volosovich,

Kuchkov

et al. 2024

Litʹë metall.

View full text Add to dashboard Cite

show abstract

Influence of initial structure of rolled sections in coils of bearing steel grade on uniformity of obtained structure after spheroidizing annealing.

Savchenko,

Kovaleva,

Guzova

et al. 2023

Černaâ metallurgiâ. Bûlletenʹ naučno-tehničeskoj informacii

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The article presents the results of the study of the effect of the initial metal microstructure in the surface layer of bunched rolling at the existing technology of rolling in the low-temperature range from bearing steel grades ШХ15 on the formation of decarburized layer after spheroidizing annealing. To meet the customer’s requirements for the metal quality, some studies of the microstructure of the subsurface zone of coiled steel have been carried out. There is a description of the developed process for cooling coiled steel made of bearing steel on an air-cooled roller table for wire rod. The effect of temperature-speed modes of coiled steel cooling on the size of the decarburized layer after spheroidizing annealing has been determined. The microstructure of coiled steel samples with a diameter of 16.5 mm, rolled according to the standard and experimental modes, as well as after spheroidizing annealing, has been studied. The causes of incomplete spheroidization of coiled steel in the subsurface layer have been revealed. The microstructure of hot-rolled samples rolled according to standard conditions has been evaluated and the effect of pearlite dispersion in the subsurface layer, which leads to overestimated values of the depth of the decarburized layer after spheroidizing annealing, has been established. An effective mode of cooling of coiled steel made of a bearing steel grade for subsequent spheroidizing annealing has been determined, which ensures the minimization of the decarburized layer and the uniformity of the microstructure along the entire coil length. The experimental mode, which consists in shifting the initial cooling temperature (in the laying coiler zone) by 30 °C, to the temperature range of 840‒860 °C, with 4 fans involved and the switching-on power of 30%, allowed to obtain a uniform structure in the surface zone (subsurface), both in the hot-rolled state (sorbite-like, fine-lamellar perlite) and in the annealed state (spheroidized), as well as to determine directions of further improvement of the technology

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Improvement of the technological process of manufacturing bearing grades of steel at the 370/150 mill.

Cited by 2 publications

References 2 publications

Development of technology and development of production of reinforcement no. 6 of strength class A500S form 2f in coils according to the requirements of GOST 34028–2016

Development of technology and development of production of reinforcement no. 6 of strength class A500S form 2f in coils according to the requirements of GOST 34028–2016

Influence of initial structure of rolled sections in coils of bearing steel grade on uniformity of obtained structure after spheroidizing annealing.

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