Abstract
The process of melting of the Si-Cr-Ni-Fe ferroalloys in the iron-carbon melt under static conditions was studied using the method of mathematical modelling. It was found that the melting process takes place in three stages. The effect of silicon concentration and the initial size of a piece of alloy on the duration of each stage of alloy melting is revealed. It was shown that an increase in the silicon content from 6 to 40 % in the complex ferroalloy of the 50 mm fraction containing ~ 27 % Cr and ~ 12 % Ni leads to a decrease in the total melting time of the alloys from 67 to 30 seconds at the iron-carbon melt temperature of 1600 ºC.
Highlights
In recent years the production of corrosion-resistant chromium-nickel steels has significantly increased in the world [1, 2]
It was shown that an increase in the silicon content from 6 to 40 % in the complex ferroalloy of the 50 mm fraction containing ~ 27 % Cr and ~ 12 % Ni leads to a decrease in the total melting time of the alloys from 67 to 30 seconds at the iron-carbon melt temperature of 1600 oС
Alloys of the Si-Cr-Ni-Fe system are characterized by a much faster melting process in steel compared to standard ferrochrome and ferronickel [9]
Summary
In recent years the production of corrosion-resistant chromium-nickel steels has significantly increased in the world [1, 2]. In Russia electrolytic nickel is mainly used for smelting of such steels, the high price of which doesn’t promote the development of steelmaking [3]. At the same time there is a shortage of relatively cheap complex nickel ferroalloys in Russia [4, 5]. The development and application of this type of ferroalloys requires awareness of their physicochemical properties [6,7,8]. One of the most important properties of the alloy intended for alloying steel is the melting time and dissolution in the iron-carbon melt that determines both the recovery and distribution of the principal alloying elements of the ferroalloy in the metal volume [9]. The melting mechanism of alloys is a fundamental factor determining the time of its melting in an iron-carbon melt. Extensive research has been carried out in this area by both domestic [10, 11] and foreign [12,13,14] metallurgists
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