Cold work tool material and method of manufacturing cold work tool
US-2017204486-A1 · Jul 20, 2017 · US
QT heat treated high carbon hot rolled steel sheet, high carbon cold rolled steel sheet, QT heat treated high carbon cold rolled steel sheet, and manufacturing methods thereof
US12595539B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12595539-B2 |
| Application number | US-202118268511-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 10, 2021 |
| Priority date | Dec 21, 2020 |
| Publication date | Apr 7, 2026 |
| Grant date | Apr 7, 2026 |
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Abstract
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Provided are a QT heat treated high carbon hot rolled steel sheet, a high carbon cold rolled steel sheet, a QT heat treated high carbon cold rolled steel sheet, and manufacturing methods thereof, wherein the QT heat treated high carbon hot rolled steel sheet comprises, in weight %, C: 1.0-1.4%, Si: 0.1-0.4%, Mn: 0.1-0.8%, Cr: 0.3-11%, W: 0.05-2.5%, P: 0.03% or less, S: 0.03% or less, Al: 0.02% or less, and the balance being Fe and other inevitable impurities, the average size of carbides being 0.1-20 μm.
First claim
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The invention claimed is: 1 . A QT heat treated high carbon hot rolled steel sheet, comprising: in weight %, C: 1.0 to 1.4%, Si: 0.1 to 0.4%, Mn: 0.1 to 0.8%, Cr: 0.3 to 11%, W: 0.05 to 2.5%, P: 0.03% or less, S: 0.03% or less, Al: 0.02% or less, and a balance of Fe and other inevitable impurities, wherein a microstructure contains, in area %, carbide: 0.1 to 20% and the balance being tempered martensite, an average size of the carbide is 0.1 to 20 μm, and wherein the hot-rolled steel sheet has a wear reduction of 35 mg or less when a reheating temperature before OT is 800° C., a wear reduction of 27 mg or less when the reheating temperature before QT is 850° C., and a wear reduction of 25 mg or less when the reheating temperature before QT is 900° C. 2 . The QT heat treated high carbon hot rolled steel sheet of claim 1 , wherein the hot-rolled steel sheet further includes one or more selected from the group consisting of V: 0.8% or less (excluding 0%), Mo: 2.5% or less (excluding 0%), and Nb: 1.5% or less (excluding 0%). 3 . The QT heat treated high carbon hot rolled steel sheet of claim 1 , wherein the hot-rolled steel sheet has a hardness of 350 Hv or more. 4 . A QT heat treated high carbon cold rolled steel sheet, comprising: in weight %, C: 1.0 to 1.4%, Si: 0.1 to 0.4%, Mn: 0.1 to 0.8%, Cr: 0.3 to 11%, W: 0.05 to 2.5%, P: 0.03% or less, S: 0.03% or less, Al: 0.02% or less, and a balance of Fe and other inevitable impurities, wherein a microstructure contains, in area %, carbide: 0.1 to 20% and the balance being tempered martensite, an average size of the carbide is 0.1 to 20 μm, and wherein the cold-rolled steel sheet has a wear reduction of 25 mg or less when the reheating temperature before QT is 900° C. 5 . The QT heat treated high carbon cold rolled steel sheet of claim 4 , wherein the cold-rolled steel sheet further includes one or more selected from the group consisting of V: 0.8% or less (excluding 0%), Mo: 2.5% or less (excluding 0%), and Nb: 1.5% or less (excluding 0%). 6 . The QT heat treated high carbon cold rolled steel sheet of claim 4 , wherein the cold-rolled steel sheet has a hardness of 350 Hv or more.
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- What does patent US12595539B2 cover?
- Provided are a QT heat treated high carbon hot rolled steel sheet, a high carbon cold rolled steel sheet, a QT heat treated high carbon cold rolled steel sheet, and manufacturing methods thereof, wherein the QT heat treated high carbon hot rolled steel sheet comprises, in weight %, C: 1.0-1.4%, Si: 0.1-0.4%, Mn: 0.1-0.8%, Cr: 0.3-11%, W: 0.05-2.5%, P: 0.03% or less, S: 0.03% or less, Al: 0.02% …
- Who is the assignee on this patent?
- Posco Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C22C38/22. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 07 2026 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).