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US 12,644,170 B2Granted
Al—Fe-alloy plated steel sheet for hot forming, having excellent TWB welding characteristics, hot forming member, and manufacturing methods therefor
AssigneePosco
InventorsSeong-Woo Kim, Jin-Keun Oh, Yeol-Rae Cho, Hyeon-Jeong Shin
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Abstract
Provided is an Al—Fe-alloy plated steel sheet for hot forming, having excellent TWB welding characteristics since excellent hardness uniformity of a TWB weld zone after hot forming is obtained by suitably controlling a batch annealing condition, after plating Al, such that an Al—Fe-alloy layer is formed; a hot forming member; and manufacturing methods therefor.
Claims20
A hot press formed part comprising:
- a base steel;
- and
- an Al—Fe alloy layer disposed on the base steel,
- wherein the Al—Fe alloy layer comprises a diffusion layer disposed on the base steel and an intermediate layer disposed on the diffusion layer,
- wherein the diffusion layer comprises, by weight percentage, Si in an amount of 0.5 to 12.0%,
- wherein the intermediate layer comprises, by weight percentage, Si in an amount of 3.0 to 20.0%, and
- wherein a sum of average thicknesses of the diffusion layer and the intermediate layer is 1.0 to 9.3 μm.
4 more elements
A hot press formed part comprising:
- a base steel;
- an Al—Fe alloy layer disposed on the base steel;
- and
- an welding zone,
- wherein the Al—Fe alloy layer comprises a diffusion layer disposed on the base steel and an intermediate layer disposed on the base steel,
- wherein the diffusion layer comprises, by weight percent, Si in an amount of 0.5 to 12.0%,
- wherein the intermediate layer comprises, by weight percent, Si in an amount of 3.0 to 20.0%,
- wherein a sum of average thicknesses of the diffusion layer and the intermediate layer is 1.0 to 9.3 μm, and
- wherein a hardness deviation of the welding zone is 100 Hv or less.
6 more elements
Dependencies are inferred from the claim text.