Patent ID: 9234255
Filing Date: 2016-01-12
CPC Classification: C21D,C22C

Claim Text:
1. A process for continuous annealing of a continuous steel strip providing mechanical properties that differ over two or more width zones defined over the width of the strip, said continuous annealing comprising: heating the respective width zones of the strip to a respective top temperature, keeping the respective width zones of the strip at the respective top temperature for a respective top temperature holding time, and cooling the heated strip after the respective top temperature holding time, and wherein over-ageing temperature is the same across the width of the strip and at least one of the following parameters in the process differs for said respective width zones over the width of the continuous strip to achieve the mechanical properties that differ over two or more width zones defined over the width of the strip: over-aging temperature holding time lowest cooling temperature before over-aging re-heating rate to over-aging temperature.