Method for continuous casting of highly ductile ferritic stainless steel strips between rolls, and resulting thin strips

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 γp index of said ferritic stainless steel to be greater than or equal to 30%, where:
• γp=420C%+470N%+23Ni%+9Cu%+7Mn%−11.5Cr%+11.5Si%−12Mo%23V%−47Nb%−49Ti%−52A1%+189;
• and,
• after casting, coiling the thin strip at a temperature of less than 600° C.