PRODUCTION OF THIN STEEL STRIP

摘要

A cast carbon steel strip (12) is prepared by continuously casting in a twin roll caster (11) and cooling to transform the strip from austenite to ferrite at a temperature range between 400°C and 850°C at cooling the strip to transform the austenite to ferrite within a temperature range between 400°C and 850°C at a cooling rate of greater than 100°C/sec without inhibiting the cooling rate to form cast strip that is less than about 1% austenite and has microstructure more than 10% of which exhibits a packet size greater than 300 mum, is either (i) a mixture of polygonal ferrite and low temperature transformation products or (ii) predominantly low temperature transformation products, and has a yield strength of at least 450 MPa. The cast strip before cooling is passed through a hot rolling mill 15 to reduce the thickness of strip by at least 15% and up to 50%.