Development of As-Rolled Dual Phase Steel Obtained by Accelerated Cooling to Extra-Low Coiling Temperature

As-rolled dual phase steels containing small amounts of alloy elements have been developed by accelerated cooling to extra low coiling temperature on hot runout table.

This manufacturing process, called ICQ method, is characterized by three step cooling pattern together with the controls of finishing and coiling temperatures.

It is economical because of using less alloy element than other methods. The dual phase steels manufactured by this method exhibit excellent formability and high bake hard-enability with small variation in properties. They have been successful in application to most of the auto-parts, especially to wheel disc with large weight saving.