Advanced high strength zinc plated steel sheet having excellent surface quality and electrical resistance spot weldability and manufacturing method thereof
US-2023024115-A1 · Jan 26, 2023 · US
High-strength hot-dip galvanized steel sheet having excellent surface quality and electric resistance spot weldability, and manufacturing method therefor
US12371770B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12371770-B2 |
| Application number | US-202118267029-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 17, 2021 |
| Priority date | Dec 18, 2020 |
| Publication date | Jul 29, 2025 |
| Grant date | Jul 29, 2025 |
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Abstract
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A hot-dip galvanized steel sheet according to one aspect of the present invention comprises a base steel sheet and a hot-dip galvanized layer formed on the surface of the base steel sheet, wherein the difference between the average of the Mn/Si values of surface oxides present on a surface portion, which is the region from the interface between the hot-dip galvanized layer and the base steel sheet to a depth of 15 nm, and the average of the Mn/Si values of internal oxides, which are present in the region from the interface to a depth of 50-100 nm, can be 0.5 or more. Mn and Si of each oxide mean the amounts (wt %) of Mn and Si components in the oxide, which are measured by EDS, and the average of Mn/Si values means the averaged value of the Mn/Si values measured for each oxide.
First claim
Opening claim text (preview).
The invention claimed is: 1. A hot-dip galvanized steel sheet, comprising: a base steel sheet; and a hot-dip galvanized layer formed on a surface of the base steel sheet, wherein a difference between an average of Mn/Si values of surface oxides present on a surface portion, which is a region from an interface between the hot-dip galvanized layer and the base steel sheet to a depth of 15 nm, and an average of Mn/Si values of internal oxides, which are present in the region from the interface to the depth of 50 to 100 nm, is 0.5 or more, and Mn and Si of each oxide mean amounts (wt %) of Mn and Si components in the oxide, which are measured by EDS, and the average of the Mn/Si values means an averaged value of the Mn/Si values measured for each oxide. 2. The hot-dip galvanized steel sheet of claim 1 , wherein the difference in the average is 0.8 or more. 3. The hot-dip galvanized steel sheet of claim 1 , wherein the average of the Mn/Si values of the surface oxides is 1.5 or more. 4. The hot-dip galvanized steel sheet of claim 1 , wherein the average of the Mn/Si values of the surface oxides is 1.7 or more. 5. The hot-dip galvanized steel sheet of claim 1 , wherein the average of the Mn/Si values of the internal oxides is 1.0 or less. 6. The hot-dip galvanized steel sheet of claim 1 , wherein the average of the Mn/Si values of the internal oxides is 0.9 or less. 7. The hot-dip galvanized steel sheet of claim 1 , wherein the base steel sheet has a composition containing C: 0.05 to 1.5%, Si: 2.0% or less, Mn: 1.0 to 20%, S-Al (acid-soluble aluminum): 3% or less, Cr: 2.5% or less, Mo: 1% or less, B: 0.005% or less, Nb: 0.2% or less, Ti: 0.2% or less, V: 0.2% or less, Sb+Sn+Bi: 0.1% or less, N: 0.01% or less.
Assignees
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Classifications
during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title
- C23C2/06Primary
Zinc or cadmium or alloys based thereon · CPC title
containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur · CPC title
with more than 1.5% by weight of manganese · CPC title
with more than 1.5% by weight of silicon · CPC title
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- What does patent US12371770B2 cover?
- A hot-dip galvanized steel sheet according to one aspect of the present invention comprises a base steel sheet and a hot-dip galvanized layer formed on the surface of the base steel sheet, wherein the difference between the average of the Mn/Si values of surface oxides present on a surface portion, which is the region from the interface between the hot-dip galvanized layer and the base steel sh…
- Who is the assignee on this patent?
- Posco Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C23C2/06. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 29 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).