High-strength cold-rolled steel sheet having excellent surface quality and low material variation, and method for manufacturing same
US-2024384366-A1 · Nov 21, 2024 · US
Cold-rolled steel plate for hot forming, having excellent corrosion-resistance and spot-weldability, hot-formed member, and method for manufacturing same
US2024301527A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2024301527-A1 |
| Application number | US-202418666200-A |
| Country | US |
| Kind code | A1 |
| Filing date | May 16, 2024 |
| Priority date | Sep 26, 2016 |
| Publication date | Sep 12, 2024 |
| Grant date | — |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
An aspect of the present invention relates to a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1 nm-100 nm on the surface thereof. Formula (1): 1.4≤ 0.4*Cr+Si≤3.2 (wherein element symbols denote measurements of respective element contents by weight %).
First claim
Opening claim text (preview).
1 . A hot-formed product, comprising: a base steel; a first oxide region comprising Si on the base steel; and a second oxide region comprising Fe on the first oxide region; wherein a first thickness of the first oxide region is smaller than a first thickness of the second oxide region. 2 . The hot-formed product of claim 1 , wherein the first oxide region comprises Mn. 3 . The hot-formed product of claim 1 , wherein the first oxide region comprises Cr. 4 . The hot-formed product of claim 1 , wherein the first oxide region comprises Fe. 5 . The hot-formed product of claim 1 , wherein the second oxide region comprises Mn. 6 . The hot-formed product of claim 1 , wherein the second oxide region comprises Cr. 7 . The hot-formed product of claim 1 , wherein the second oxide region comprises Si. 8 . The hot-formed product of claim 1 , wherein the first thickness of the first oxide region is smaller than a second thickness of the first oxide region. 9 . The hot-formed product of claim 1 , wherein the first thickness of the second oxide region is smaller than a second thickness of the second oxide region. 10 . The hot-formed product of claim 1 , wherein an amount of Cr of the first oxide region is greater than an amount of Cr of the second oxide region. 11 . A hot-formed product, comprising: a base steel; a first oxide region comprising Si on the base steel; and a second oxide region comprising Fe on the first oxide region; wherein the first oxide region is continuously or discontinuously formed on the base steel. 12 . The hot-formed product of claim 11 , wherein the first oxide region comprises Mn. 13 . The hot-formed product of claim 11 , wherein the first oxide region comprises Cr. 14 . The hot-formed product of claim 11 , wherein the first oxide region comprises Fe. 15 . The hot-formed product of claim 11 , wherein the second oxide region comprises Mn. 16 . The hot-formed product of claim 11 , wherein the second oxide region comprises Cr. 17 . The hot-formed product of claim 11 , wherein the second oxide region comprises Si. 18 . The hot-formed product of claim 11 , wherein a first thickness of the first oxide region is smaller than a second thickness of the first oxide region. 19 . The hot-formed product of claim 11 , wherein a first thickness of the second oxide region is smaller than a second thickness of the second oxide region. 20 . The hot-formed product of claim 11 , wherein an amount of Cr of the first oxide region is greater than an amount of Cr of the second oxide region.
Assignees
Inventors
Classifications
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2024301527A1 cover?
- An aspect of the present invention relates to a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and incl…
- Who is the assignee on this patent?
- Posco Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C21D8/0236. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Sep 12 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).