Abstract
The speed of billet withdrawal from a continuous caster (CC) mold has a decisive effect on the CC productivity. However, increase of the speed results in an increase of pollution of the CC metal by non-metallic inclusion and increase of surface defects of CC billet. Estimation of steel casting speed mode impact on the degree of different defects formation presented for long products CC billets, casted at a five-strand CC of radial type. Defects of CC billet from Ст3сп steel grade studied for a billet having section of 150×150 mm. The purpose of the study was to determine the degree of influence of withdrawal speed, metal chemical composition and billets cross section dimensions on billets quality. Array of industrial data of more than 550 billets studied, 80.4% of which were casted by an open stream and the balance – by a closed stream. As a result of the CC billets quality study it was confirmed, that during metal casting by an open stream the degree of evolution of form defect, like rhombic defects, internal and surface defects is higher comparing with those when casting by a closed stream. General tendency of increase of the CC metal pollution by non-metallic inclusions at the increase of billet withdrawal speed. The tendency is similar for both casting by an open and by a closed stream. However, during casting by an open stream the increase takes place rather evenly. During casting by a closed stream a sharp increase of billets with defects were observed at the billets withdrawal speed exceeding 2.4 m/min. Linear dependencies of billets withdrawal speed while casting by a closed stream on the degree of liquation cracks evolution and general strips, edge point pollutions and peripheral fine structure metal zone thickness determined. To improve the long products billets surface, casted by a closed stream, it was recommended to restrict the withdrawal speed of the billet from a carbon steel of general quality by the value of 2.4 m/min.
Highlights
В ранее проведенных исследованиях [1,2,3] авторами изучено влияние на скорость вытягивания сортовых заготовок различных параметров непрерывной разливки стали на пятиручьевой МНЛЗ радиального типа
mold has a decisive effect on the continuous caster (CC) productivity
Estimation of steel casting speed mode impact on the degree of different defects formation presented for long products CC billets
Summary
В ранее проведенных исследованиях [1,2,3] авторами изучено влияние на скорость вытягивания сортовых заготовок различных параметров непрерывной разливки стали на пятиручьевой МНЛЗ радиального типа. Увеличение перегрева стали Ст3сп на 20 °С вызывает уменьшение скорости вытягивания заготовки сечением 150×150 мм при разливке металла открытой и закрытой струей в среднем на 12 и 10 % (отн.) соответственно. Степень развития всех дефектов макроструктуры сортовой заготовки, отлитой открытой струей, сильнее, чем при разливке закрытой струей.
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