980MPa-grade hot-dip galvanized complex-phase steel with high hole expansion property and preparation method thereof

The invention provides 980MPa-grade hot-dip galvanized complex-phase steel with high hole expansion performance and a preparation method, and belongs to the field of steel preparation. The hot galvanizing complex phase steel comprises a steel matrix and a zinc coating attached to at least part of the surface of the steel matrix, and the steel matrix comprises the following chemical components in percentage by mass: 0.03%-0.3% of C, 0.1%-1.0% of Si, 0.2%-3.0% of Mn, less than or equal to 0.01% of P, less than or equal to 0.006% of S, 0.05%-1.0% of Cr, 0.01%-0.1% of Nb, 0.01%-0.1% of Ti and the balance of Fe and inevitable impurities; the metallographic structure of the steel matrix comprises the following components in percentage by volume: 10%-20% of bainite, 30%-50% of martensite and 20%-30% of ferrite. 本发明提供了一种高扩孔性的980MPa级热镀锌复相钢及制备方法，属于钢材制备领域。热镀锌复相钢包括钢基体和附着于所述钢基体至少部分表面的镀锌层，以质量分数计，所述钢基体的化学成分包括：C：0.03％～0.3％，Si：0.1％～1.0％，Mn：0.2％～3.0％，P≤0.01％，S≤0.006％，Cr：0.05％～1.0％，Nb：0.01％～0.1％，Ti：0.01％～0.1％，余量为Fe及不可避免杂质；以体积分数