Patent ID: 8002908
Filing Date: 2011-08-23
Classification: B22D,C21D,C22C,Y10T

Abstract:
1. A steel product with a high austenite grain coarsening temperature made from a steel strip produced by continuous casting by steps comprising: assembling a pair of cooled casting rolls having a nip between them and with confining closures adjacent the ends of the nip; introducing molten low carbon steel having a total oxygen content of at least 100 ppm and a free oxygen content between 30 and 50 ppm between the pair of casting rolls to form a casting pool between the casting rolls; counter rotating the casting rolls and solidifying the molten steel to form metal shells on the surfaces of the casting rolls with levels of oxide inclusions reflected by the total oxygen content of the molten steel to promote the formation of thin steel strip; and forming solidified thin steel strip through the nip between the casting rolls from said solidified shells.