| 摘要 |
<p>The invention concerns a method for making a low carbon and low manganese cold rolled steel strip for deep-drawing whereby a steel strip hot rolled in the austenistic region coiled at the end of the high temperature hot rolling process (680 °C < T < 750 °C) is subjected to a cold rolling process with a reduction rate between 65 and 80 %, and finally subjected to an annealing and overageing heat treatment. It consists in heating the steel strip at a heating rate Vh ranging between 150 °C/s and 1000 °C up to the annealing temperature Ta ranging between 650 °C and 750 °C, and in maintaining it at said annealing temperature for a time interval between 1 and 20 seconds, then in cooling it at a cooling rate Vc between 100 °C/s and 500 °C/s up to an overageing temperature Toa ranging between 150 °C and 450 °C.</p> |
