Analyzing the Features of Non-Metallic Inclusion Distribution in Ø410 mm Continuously Cast Billets of Low Carbon Steel Grades

The paper reports findings on the morphology of non-metallic inclusions in low carbon pre-peritectic and peritectic steel grades used for the fabrication of seamless pipes. It is demonstrated that the distribution of non-metallic inclusions over the cross section area of continuously cast billets is of a step-like nature conditioned by the features of billet solidification. In all the steels analyzed the non-metallic inclusions are presented by oxides, sulfides and complex oxi-sulfides not larger than 2 μm.

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Analysis of Non-metallic Inclusions in Continuously Cast Low-Carbon Steel

DEStech Transactions on Engineering and Technology Research ◽

10.12783/dtetr/icace2018/25511 ◽

2018 ◽

Author(s):

Zhanshan Wei ◽

Zhuang Li ◽

Wei Lv ◽

Xijun Cui ◽

Qi Zhou

Keyword(s):

Carbon Steel ◽

Low Carbon Steel ◽

Low Carbon ◽

Metallic Inclusions ◽

Continuously Cast

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Optimization of two-stage cooling conditions for wire rod diameter 5.5–6.5 mm of low-carbon steel grades in order to ensure the required degree of descaling mechanically before its subsequent processing

Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY) ◽

10.21122/1683-6065-2018-3-63-66 ◽

2018 ◽

pp. 63-66

Author(s):

V. V. Savinkov ◽

I. A. Kovaleva

Keyword(s):

Carbon Steel ◽

Low Carbon Steel ◽

Air Cooling ◽

Low Carbon ◽

Optimal Thickness ◽

Wire Rod ◽

Mechanical Removal ◽

Cooling Conditions ◽

Steel Grades ◽

The Wire

With the aim of obtaining scale with a high degree possibility of mechanical removal under the conditions of the section rolling shop No. 1, at the mill «150» JSC «Belarusian Metallurgical Works – Management Company of Holding «BMC» developed technological modes of production of wire rods made of low-carbon steel grades.The peculiarities of scale formation were studied, namely, the factors influencing the removability, obtaining the optimal thickness and its phase components on the wire rod diameter 5.5–6.5 mm in the cooling process immediately after rolling, intended for wire production.To obtain the necessary ratio of the phase constituents of the scales on the surface of the wire rod, the following factors was taken into account: the temperature of the layout of the turns on the roller table in the air cooling line; (uniformity along the length of the turn), the cooling conditions of the helix of the turns (prevention of the 4FeO = Fe3O4-Fe decay), where the condition of cooling the wire rod from 600 to 250 °С, not exceeding 100 s, must be observed.The results of metallographic studies of scale on the wire surface are presented. The introduced technological regimes provided the optimal thickness and the FeO / Fe3O4 ratio after the experimental rolling of the metal. Exhausted cooling regimes allowed to reduce the consumption of fiber for all types of wire.

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Statistical Relation Between the Content of Non-metallic Inclusions and Plasticity Factors of Low-carbon Steel

Strength of Metals and Alloys ◽

10.1016/b978-1-4832-8412-5.50127-2 ◽

1979 ◽

pp. 749-753

Author(s):

E. Wieczorek ◽

A. Lubuśka

Keyword(s):

Carbon Steel ◽

Low Carbon Steel ◽

Statistical Relation ◽

Low Carbon ◽

Metallic Inclusions

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Deformation and Structure Difference of Steel Droplets during Initial Solidification

High Temperature Materials and Processes ◽

10.1515/htmp-2016-0113 ◽

2017 ◽

Vol 36 (4) ◽

pp. 347-357 ◽

Cited By ~ 2

Author(s):

Yang Li ◽

Jing Wang ◽

Jiaquan Zhang ◽

Changgui Cheng ◽

Zhi Zeng

Keyword(s):

Carbon Steel ◽

Continuous Casting ◽

High Carbon Steel ◽

Low Carbon Steel ◽

Carbon Steels ◽

Solidification Structure ◽

Low Carbon ◽

High Carbon ◽

Peritectic Steel ◽

Initial Solidification

AbstractThe surface quality of slabs is closely related with the initial solidification at very first seconds of molten steel near meniscus in mold during continuous casting. The solidification, structure, and free deformation for given steels have been investigated in droplet experiments by aid of Laser Scanning Confocal Microscope. It is observed that the appearances of solidified shells for high carbon steels and some hyper-peritectic steels with high carbon content show lamellar, while that for other steels show spherical. Convex is formed along the chilling direction for most steels, besides some occasions that concave is formed for high carbon steel at times. The deformation degree decreases gradually in order of hypo-peritectic steel, ultra-low carbon steel, hyper-peritectic steel, low carbon steel, and high carbon steel, which is consistent with the solidification shrinkage in macroscope during continuous casting. Additionally, the microstructure of solidified shell of hypo-peritectic steel is bainite, while that of hyper-peritectic steel is martensite.

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Objective Laws of Nitrogen Removal in the Vacuum Tank Degasser

Materials Science Forum ◽

10.4028/www.scientific.net/msf.989.381 ◽

2020 ◽

Vol 989 ◽

pp. 381-387

Author(s):

Vlasta D. Tutarova ◽

Alexey N. Shapovalov ◽

Alexander N. Kalitaev

Keyword(s):

Nitrogen Content ◽

Nitrogen Removal ◽

Low Carbon Steel ◽

Regression Equations ◽

Low Carbon ◽

Efficient Removal ◽

Vacuum Degassing ◽

Rational Combination ◽

Steel Grades ◽

Steel Treatment

This article discusses the problems of efficient removal of nitrogen in the vacuum tank degasser operating at the electric arc furnace shop of Uralskaya Stal (Ural Steel) OJSC in the course of manufacturing of high-quality low carbon steel grades by means of steel grades «2» and «T». In order to determine the reasonable and balanced treatment parameters that ensure the required level of nitrogen content in the above steel grades, an analysis of production data for the period of November-December 2016 has been carried out. This analysis is the basis for identifying the vacuum degassing parameters in compliance with the technological capabilities and well-balanced levels, which allow predicting the level of nitrogen content in steel. To assess the cumulative quantitative effect of the main parameters of vacuum degassing on nitrogen removal, there has been performed a regression analysis. As a result, there have been obtained multiple regression equations describing a rational combination of steel treatment parameters for achieving the required nitrogen removal level.

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