PROCESSING OF THE BIMODAL ULTRAFINE GRAINED MICROALLOYED DUAL PHASE STEEL SHEETS

摘要

The present invention relates to processing of the bimodal ultrafine grained microalloyed dual phase steel sheets with high ultimate tensile strength (1200 - 1900 MPa), high uniform elongation (16-25 %) and high toughness (200 - 230 MJ/m3), for automotive applications by method such as warm rolling and intercritical annealing. The method of the invention has the advantages of simple working procedure and industrially scalable prospect.