Continuous annealing process for steel sheet manufacture

Abstract From the Canadian patent

A low yield point cold-reduced steel sheet suitable for press-forming can be obtained by a full continuous annealing process when a low carbon steel is manufactured as follows: 1. The chemical composition is substantially controlled during the steel making stage as follows 02 ? 0.02% preferably 0.014%, depending upon additions of Si and Al, Si ? 0.2% preferably 0.1% to 0.02% Sol.Al ? 0.009% preferably 0.005%, 2. During the hot-rolling stage after ordinary stabbing a hot-rolled steel strip is coiled within the range of 650°C. to 800°C. 3. During the continuous annealing stage after ordinary pickling - cold-reducing, a cold-reduced steel strip is subjected to a full continuous annealing …