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US 2019/0160507 A1Published application
Hot stamped steel
AssigneeNippon Steel & Sumitomo Metal Corporation
InventorsAkihiro SENGOKU, Hiroshi TAKEBAYASHI, Koji AKIOKA
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Abstract
A hot stamped steel according to one embodiment of the present invention includes a base material and a plated layer, wherein the plated layer includes an interface layer, an intermediate layer, and an oxide layer in order from a base material side to a surface side; in which compositions and thicknesses of each layer are controlled.
Claims8
A hot stamped steel comprising:
- a base material;
- and
- a plated layer,
- wherein the plated layer includes an interface layer, an intermediate layer, and an oxide layer in order from a base material side to a surface side,
- in the interface layer, a structure includes 99 area % or more in total of αFe, Fe3Al, and FeAl, an average Al content is in a range of 8.0 mass % or more and 32.5 mass % or less, an average Zn content is limited to more than a Zn content of the base material and 5 mass % or less, a remainder of a chemical composition includes Fe and impurities, and an average layer thickness is 1.0 μm or more,
- in the intermediate layer, a structure includes 99 area % or more in total of Fe(Al, Zn)2 and Fe2(Al, Zn)5, an average Al content is 30 mass % to 50 mass %, an average Zn content is 10 mass % to 40 mass %, a remainder of a chemical composition includes Fe and the impurities, and an average layer thickness is 5.0 μm or more, and
- in the oxide layer, an average layer thickness is 0.1 μm to 3.0 μm.
4 more elements
Dependencies are inferred from the claim text.