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Abstract

Disclosed in the present invention are a hot stamped steel plate with Al—Zn—Mg—Si plating and a hot stamping method therefor; before hot stamping, the initial structure of the Al—Zn—Mg—Si plating is composed of a Zn-rich phase, an Al-rich phase, a MgZn₂ phase, an MgSi₂ phase, and a Fe—Al—Si alloy layer; after hot stamping, when the heat preservation time of the plating structure is t≤3 min, the plating is composed of an upper and lower layer, the structure of the first layer being composed of an Al-rich phase, a Zn-rich phase, and an MgZn₂ phase, and the volume percentage ratio of the sum of the Zn phase and the MgZn₂ phase is between 20% and 80%; the structure of the second layer is composed of an FeAl₃ phase and a Zn-rich phase, and the volume percentage ratio of the Zn-rich phase does not exceed 5%; when the heat preservation time is t>3 min, the plating is composed of a single-layer alloy layer, and the alloy layer is mostly composed of a FeAl₃ phase, wherein a Zn-rich phase and an MgZn₂ phase are present between the FeAl₃ phase, and the volume percentage ratio of the sum of the Zn phase and the MgZn₂ phase is 5-50%; and also relating to a hot stamping method. In the steel plate of the present invention, after hot stamping the plating has good corrosion resistance, and cracks on the substrate caused by liquid metal brittleness can be avoided.

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