Patent ID: 7425240
Filing Date: 2008-09-16
Classification: C21D,C22C

Abstract:
1. A Process for manufacturing a steel product made of copper-rich carbon steel, wherein: a liquid steel is produced, which has the following composition, expressed as percentages by weight: 0.1% ≦C≦1% 0.5≦Cu≦10% 0≦Mn≦2% 0≦Si≦5% 0≦Ti≦0.5% 0≦Nb≦0.5% 0≦Ni≦5% 0≦Al≦2% the remainder being iron and impurities resulting from production; this liquid steel is cast directly into the form of a thin strip having a thickness less than or equal to 10 mm; the strip is cooled rapidly to a temperature less than or equal to 1000° C. by spraying with water or a water/air mixture; the thin strip is subjected to hot-rolling at a reduction rate of at least 10%, the end-of-rolling temperature beina such that, at this temperature, all the copper is still in a solid solution in the ferrite and/or austenite matrix; the strip is subjected to forced cooling so as to keep the copper in a supersaturated solid solution in the ferrite and/or austenite matrix; and the strip thus cooled is coiled at a temperature higher than the temperature M