Aspects of a technology for obtaining semifinished products of low-carbon steel on a continuous section caster

Abstract

The Chelyabinsk Metallurgical Combine has mastered a technology for obtaining continuous-cast semifinished products of low-carbon ([C] < 0.10%) steels SAE1006 and SAE1008. These steels are cast in an open stream on a continuous section caster with 100 × 100 mm molds. It was determined that good-quality semifinished products and favorable casting conditions are assured by deoxidizing the steel with secondary aluminum during casting. The amount of aluminum used here is 1.2 kg/ton. The aluminum is introduced into the ladle before the ferroalloys. The value of the ratio [Mn]:[S] in the finished steel should be no lower than 22, while the value of [Mn]:[Si] should be at least 2.5. Casting speed is kept at or below 5.2 m/min, and the maximum pressure exerted on the semifinished product by the withdrawing rollers is 35 ton-f. Scanning electron microscopy and x-ray phase analysis were used to determine the composition of the sulfide compounds in the steels when the ratio [Mn]:[S] has the values 14.8 and 17.7.