High-strength composite structure steel with excellent burring properties in the low temperature range and its manufacturing method

摘要

The present invention relates to a high strength multi-phase steel having excellent burring properties at low temperature, and a method for producing the same. More specifically, the present invention relates to a high strength multi-phase steel having excellent burring properties at low temperature, and a method for producing the same, wherein the multi-phase steel can be appropriately used as a member, a lower arm, a reinforcement material, a connection material, or the like for a vehicle chassis component.