Patent ID: 6588494
Filing Date: 2003-07-08
Classification: B22D,C21D,C22C

Abstract:
A process for the casting of thin strip having a thickness of less than 10 mm, made of ferritic stainless steel, directly from liquid metal between two rotating cooled rolls having parallel horizontal axes, said method comprising the steps of:providing said ferritic stainless steel with a content, in percentages by weight, from 11 to 18% chromium, less than 1% manganese, less than 1% silicon and less than 2.5%, but greater than 0%, molybdenum; providing said ferritic stainless steel with carbon and nitrogen contents, the sum of the contents not exceeding 0.05%; providing said ferritic stainless steel with contents of at least one of stabilizing elements titanium, niobium, zirconium and aluminium so that the sum of their contents is between 0.05 and 1%; providing other elements in the form of iron and the usual impurities resulting from melting; choosing the &ggr;p index of said ferritic stainless steel to be greater than or equal to 30%, where: &ggr;p=420C%+470N%+23Ni%+9Cu%+7Mn%âˆ’11.5Cr%+11.5Si%âˆ’12Mo%23V%âˆ’47Nb%âˆ’49Ti%âˆ’52A1%+189; and,after casting, coiling the thin strip at a temperature of less than 600Â° C.