The present invention relates to a plated steel sheet for hot stamping comprising a steel sheet and a Zn—Ni plating layer formed on at least one surface of the steel sheet, wherein the Zn—Ni plating layer has an Ni concentration of 8 mass % or more, a plating deposition amount of 10 g/m.sup.2 or more and 90 g/m.sup.2 or less per surface, and an average grain size of 50 nm or more, and a difference between a diffraction peak of the Zn—Ni plating layer after heat treating the plated steel sheet for hot stamping at 200° C. for 1 hour, and a diffraction peak of the Zn—Ni plating layer before heat treating it, is 0.3° or less.

A high-strength cold-rolled steel sheet which is a steel sheet having a tensile strength of 980 MPa or more has a predetermined chemical component composition, a metallographic microstructure of the steel sheet contains, by area ratio, ferrite and granular bainite: 10% or more and 50% or less in total, one or both of upper bainite and lower bainite: 10% or more and 50% or less in total, tempered martensite: more than 0% and 30% or less, retained austenite: 5% or more, and one or more of pearlite, cementite, and martensite: 0% to 10% in total, and an area ratio of the ferrite with respect to a total area ratio of the ferrite and the granular bainite is 25% or less.

Provided is a multilayer zinc alloy plated steel material comprising a base steel material and multiple plating layers formed on the base steel material, wherein each of the multiple plating layers includes one of a Zn plating layer, a Mg plating layer, and a Zn—Mg alloy plating layer, and the ratio of the weight of Mg contained in the multiple plating layers to the total weight of the multiple plating layers is from 0.13 to 0.24.

Provided is a multilayer zinc alloy plated steel material comprising a base steel material and multiple plating layers formed on the base steel material, wherein each of the multiple plating layers includes one of a Zn plating layer, a Mg plating layer, and a Zn—Mg alloy plating layer, and the ratio of the weight of Mg contained in the multiple plating layers to the total weight of the multiple plating layers is from 0.13 to 0.24.

Provided are a single layer zinc alloy plated steel material and a fabrication method therefor, the single layer zinc alloy plated steel material comprising a base iron and a zinc alloy plating layer formed on the base iron, wherein the zinc alloy plating layer contains 13-24 wt % of Mg, and the adhesion amount of the zinc alloy plating layer is at most 40 g/m.sup.2 (excluding 0 g/m.sup.2).

A high-strength steel sheet having a tensile strength of 1,180 MPa or more, and specified chemical composition. The steel sheet includes a steel structure in which an area fraction of martensite having a carbon concentration of more than 0.7×[% C] and less than 1.5×[% C] is 55% or more, an area fraction of tempered martensite having a carbon concentration of 0.7×[% C] or less is 5% or more and 40% or less, a ratio of a carbon concentration in retained austenite to a volume fraction of retained austenite is 0.05 or more and 0.40 or less, and the martensite and the tempered martensite each have an average grain size of 5.3 μm or less, where [% C] represents the content, by mass %, of compositional element C in steel.

Provided is a zinc alloy-plated steel material used in automobiles, building materials, home appliances, or the like, and more specifically, to a zinc alloy-plated steel material having excellent corrosion resistance and surface quality, and a method for producing same.

Provided are a zinc alloy plated steel and a method for manufacturing same, the zinc alloy plated steel comprising: a base iron; a Zn plated layer formed on top of the base iron; and a Zn—Mg alloy layer formed on top of the Zn plated layer and obtained through mutual diffusion of Zn and Mg, wherein the ratio of the weight of Mg contained in the Zn—Mg alloy layer with respect to the total weight of the Zn plated layer and the Zn—Mg alloy layer is 0.13 to 0.24, and the sum of the adhesion quantity of the Zn layer and the Zn—Mg alloy layer is no more than 40 g/m.sup.2 (more than 0 g/m.sup.2).

A hot-dip-coated, non-skin-passed, cold-rolled metal strip is provided. The metal coating of the metal strip includes a waviness Wa.sub.0.8 of less than or equal to 0.70 μm, 0.2 to 8% by weight of aluminum and magnesium, and up to 0.3% by weight of additional elements, the balance being zinc and inevitable impurities. Metal parts are also provided.

A hot-dip-coated, non-skin-passed, cold-rolled metal strip is provided. The metal coating of the metal strip includes a waviness Wa.sub.0.8 of less than or equal to 0.70 μm, 0.2 to 8% by weight of aluminum and magnesium, and up to 0.3% by weight of additional elements, the balance being zinc and inevitable impurities. Metal parts are also provided.