Patent ID: 7299856
Filing Date: 2007-11-27
Classification: B22D,Y10T

Abstract:
1. A thin cast steel strip having low surface roughness and low porosity made by the steps comprising: a. assembling a pair of cooled casting rolls having a nip between them and with confining closure adjacent the ends of the nip; b. introducing molten steel having a total oxygen content of at least 100 ppm between the pair of casting rolls to form a casting pool between the casting rolls at a temperature such that a majority of the oxide inclusions formed therein are in liquidus state, and producing in the steel strip MnO.SiO c. counter-rotating the casting rolls and transferring heat from the molten steel to form metal shells on the surfaces of the casting rolls such that the shells grow to include oxide inclusions relating to the total oxygen content of the molten steel; and d. forming solidified thin steel strip through the nip between the casting rolls from said solidified shells, the thin steel strip through the nip between the casting rolls from said roughness.