Abstract
Thermo-gravimetric method was used to determine the temperature of crystallization onset of alloys of the Fe – Ni – Cr – C – Si system depending on concentration of chromium and nickel. It was shown that complex ferroalloys containing 0.2 – 21.0 % Ni (at Cr = 25 – 28 %); 0.5 – 45.0 % Cr (at Ni = 10 – 11 %); 2.0 % C and 0.3 % Si, iron, and impurities belong to the category of low-melting alloys and have rational values (1320 – 1400 °C) of crystallization temperatures in terms of their use for steel processing in the ladle. An increase of the chromium content to more than 45 % in these alloys is accompanied by an intense increase of their temperatures of the crystallization onset.
Highlights
Thermo-gravimetric method was used to determine the temperature of crystallization onset of alloys of the Fe – Ni – Cr – C – Si system depending on concentration of chromium and nickel
It was shown that complex ferroalloys containing 0.2 – 21.0 % Ni; 0.5 – 45.0 % Cr; 2.0 % C and 0.3 % Si, iron, and impurities belong to the category of low-melting alloys and have rational values (1320 – 1400 °C) of crystallization temperatures in terms of their use for steel processing in the ladle
An increase of the chromium content to more than 45 % in these alloys is accompanied by an intense increase of their temperatures of the crystallization onset
Summary
Термогравиметрическим методом определены температуры начала кристаллизации сплавов системы Fe – Ni – Cr – С – Si в зависимости от концентрации хрома и никеля. Эти ферросплавы относятся к категории легкоплавких сплавов и обладают рациональными (1320 – 1400 °С) температурами кристаллизации с точки зрения применения для обработки стали в ковше. По данным работы [5] оптимальная температура начала кристаллизации ферросплавов, предназначенных для обработки стали, не должна превышать 1400 °С. Температуру кристаллизации сплавов определяли методом фиксирования температурных кривых при охлаждении расплавов [6] на высокотемпературной. Что при увеличении концентрации никеля во всем рассмат риваемом интервале (0,2 – 21,0 %) наблюдается стабильное снижение (от 1387 до 1318 °С) температуры начала кристаллизации образцов с интенсивностью примерно 3,3 °С/% Ni
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