Patent ID: 7367378
Filing Date: 2008-05-06
Classification: B22D,Y10T

Abstract:
1. A method of producing thin cast strip with low surface roughness and low porosity by continuous casting comprising the steps of: 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 oxide inclusions formed therein are in a 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 form steel strip free of crocodile surface roughness; and d. forming solidified thin steel strip through the nip between the casting rolls from said solidified shells with low surface roughness.