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US 2026/0218362 A1Published application
Member and method for manufacturing same
AssigneePosco
InventorsKang-Min LEE, Hyeo-Seok HWANG, Kkoch-Nim OH, Ji-Eun OH, Yong-Kyun CHO
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Abstract
The present invention relates to a member and a method for manufacturing same, and more specifically, to a hot press molded member having excellent chemical treatment properties and a method for manufacturing same.
Claims11
A member, comprising:
- a base steel sheet;
- and
- a plating layer formed on the base steel sheet,
- wherein the plating layer comprises a first alloy layer, a second alloy layer, a third alloy layer, and a fourth alloy layer, sequentially formed from the base steel sheet,
- wherein the fourth alloy layer has an R value of 1200 to 4500 as defined in the following Relational Expression 1,
- R
- =
- [
- Rpc
- ]
- *
- [
- Zn
- ]
- in Expression above, [Rpc] is surface roughness indicating the number of peaks per 10 mm, and [Zn] is a weight % of an element.
12 more elements
A method for manufacturing a member, comprising:
- preparing a base steel sheet;
- plating by immersing the base steel sheet in a plating bath comprising, by weight %, 26.0 to 30.0% of Zn, 6.0 to 9.0% of Si, with a remainder of Al and inevitable impurities;
- skin pass milling the plated steel sheet;
- heating the skin pass-milled steel sheet to a temperature within a range of Ac3 to 950° C. and maintaining the same for 1 to 1000 seconds;
- and
- hot press forming the heated and maintained steel sheet.
3 more elements
Dependencies are inferred from the claim text.