Martensitic Cr-containing steel and oil country tubular goods
US-10246765-B2 · Apr 2, 2019 · US
Martensitic stainless steel sheet
US11072837B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11072837-B2 |
| Application number | US-201716341450-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 6, 2017 |
| Priority date | Oct 18, 2016 |
| Publication date | Jul 27, 2021 |
| Grant date | Jul 27, 2021 |
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- Title
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Abstract
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A martensitic stainless steel sheet comprises a chemical composition containing, in mass %, C: 0.035% to 0.090%, Si: 0.01% to 1.0%, Mn: 0.01% to 0.90%, P: 0.050% or less, S: 0.050% or less, Cr: 10.0% to 14.0%, Ni: 0.01% to 0.40%, Al: 0.001% to 0.50%, V: 0.05% to 0.50%, and N: 0.050% to 0.20%, with the balance being Fe and inevitable impurities, wherein a content of C and a content of N in the chemical composition satisfy C %+N % 0.10% and N % C %, the number of precipitates with a major axis length of 200 nm or more in a surface layer of the martensitic stainless steel sheet is 25 or less per 100 μm2, and the martensitic stainless steel sheet has a tensile strength of 1300 MPa or more, a proof stress of 1100 MPa or more, and an elongation of 8.0% or more.
First claim
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The invention claimed is: 1. A martensitic stainless steel sheet comprising a chemical composition containing, in mass %, C: 0.035% to 0.090%, Si: 0.01% to 1.0%, Mn: 0.01% to 0.90%, P: 0.050% or less, S: 0.050% or less, Cr: 10.0% to 14.0%, Ni: 0.01% to 0.40%, Al: 0.001% to 0.50%, V: 0.05% to 0.50%, and N: 0.050% to 0.20%, with the balance being Fe and inevitable impurities, wherein a content of C and a content of N in the chemical composition satisfy the following Formulas (1) and (2): C % +N % ≥0.10% (1) N % ≥C % (2) where C % and N % respectively denote the content of C and the content of N in steel in mass %, the number of precipitates with a major axis length of 200 nm or more in a surface layer of the martensitic stainless steel sheet is 25 or less per 100 μm 2 , and the martensitic stainless steel sheet has a tensile strength of 1300 MPa or more, a proof stress of 1100 MPa or more, and an elongation of 8.0% or more. 2. The martensitic stainless steel sheet according to claim 1 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of Mo: 0.01% to 0.50%, Cu: 0.01% to 0.15%, and Co: 0.01% to 0.50%. 3. The martensitic stainless steel sheet according to claim 1 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of Ti: 0.01% to 0.15%, Nb: 0.01% to 0.15%, and Zr: 0.01% to 0.15%. 4. The martensitic stainless steel sheet according to claim 1 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of B: 0.0002% to 0.0100%, Ca: 0.0002% to 0.0100%, and Mg: 0.0002% to 0.0100%. 5. The martensitic stainless steel sheet according to claim 2 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of Ti: 0.01% to 0.15%, Nb: 0.01% to 0.15%, and Zr: 0.01% to 0.15%. 6. The martensitic stainless steel sheet according to claim 2 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of B: 0.0002% to 0.0100%, Ca: 0.0002% to 0.0100%, and Mg: 0.0002% to 0.0100%. 7. The martensitic stainless steel sheet according to claim 3 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of B: 0.0002% to 0.0100%, Ca: 0.0002% to 0.0100%, and Mg: 0.0002% to 0.0100%. 8. The martensitic stainless steel sheet according to claim 5 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of B: 0.0002% to 0.0100%, Ca: 0.0002% to 0.0100%, and Mg: 0.0002% to 0.0100%.
Assignees
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Classifications
during manufacturing of plates or strips (C21D8/12 takes precedence) · CPC title
- C21D8/04Primary
to produce plates or strips for drawing, e.g. for deep-drawing · CPC title
Handling in a vacuum · CPC title
following hot rolling · CPC title
Cold rolling · CPC title
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Frequently asked questions
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- What does patent US11072837B2 cover?
- A martensitic stainless steel sheet comprises a chemical composition containing, in mass %, C: 0.035% to 0.090%, Si: 0.01% to 1.0%, Mn: 0.01% to 0.90%, P: 0.050% or less, S: 0.050% or less, Cr: 10.0% to 14.0%, Ni: 0.01% to 0.40%, Al: 0.001% to 0.50%, V: 0.05% to 0.50%, and N: 0.050% to 0.20%, with the balance being Fe and inevitable impurities, wherein a content of C and a content of N in the c…
- Who is the assignee on this patent?
- Jfe Steel Corp
- What technology area does this patent fall under?
- Primary CPC classification C21D8/04. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 27 2021 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 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).