Hot-dip galvanized dual-phase steel and preparation method thereof

The invention relates to the technical field of steel manufacturing, in particular to hot-dip galvanized dual-phase steel and a preparation method thereof. A steel matrix of the hot-dip galvanized dual-phase steel comprises the following chemical components: C, Mn, Si, Al, P, S, Cr and Fe; wherein in percentage by mass, the content of C is 0.04%-0.09%, the content of Mn is 1.0%-1.5%, the content of Si is 0.1%-0.3%, the content of Al is 0.02%-0.06%, the content of P is smaller than or equal to 0.02%, the content of S is smaller than or equal to 0.003%, and the content of Cr is 0.4%-0.7%. In the chemical components of the hot-dip galvanized dual-phase steel, Mo is replaced by Cr, C-Mn-Cr system dual-phase steel is developed, the alloy cost is reduced, and then the production cost of existing hot-dip galvanized dual-phase steel is reduced. 本申请涉及钢材制造技术领域，尤其涉及一种热镀锌双相钢及其制备方法。所述热镀锌双相钢的钢基体的化学成分包括：C、Mn、Si、Al、P、S、Cr以及Fe；其中，以质量分数计，C的含量为0.04-0.09％，Mn的含量为1.0-1.5％，Si的含量为0.1-0.3％，Al的含量为0.02-0.06％，P的含量为≤0.02％，S的含量为≤0.003％，Cr