Patent ID: 7690417
Filing Date: 2010-04-06
Classification: B22D,C22C

Abstract:
1. A method for making a thin cast strip with reduced meniscus marks comprising the steps of: a. assembling a pair of casting rolls laterally positioned to form a nip therebetween; b. preparing molten steel having a carbon content in the range of about 0.01 to about 0.3% by weight, a manganese content between about 0.1 and about 2.0% by weight, a silicon content between about 0.05 and about 0.5% by weight, a calcium content between about 8 ppm and about 40 ppm, an aluminum content between about 2 ppm and about 90 ppm by weight, a chromium content up to about 10.0% by weight, having a free oxygen content below about 50 ppm at about 1600° C.; c. forming a casting pool of the molten steel supported on casting surfaces of the casting rolls above the nip; and d. counter-rotating the casting rolls to cause thin strip to be casted downwardly from the nip.