Development of 340MPa Grade Galvanized Automotive HSLA Sheet of Shougang

In the paper, development of 340MPa galvanized grade HSLA sheet of Shougang is introduced. The effects of annealing parameters on the precipitates, microstructures and mechanical properties were investigated. According to the experiment, it was indicated that the fine microstructures and disperse carbide of Nb caused high strength of the steel. And now, the product has been used to the reinforced inner panel.