Girth welded joint of steel pipe
US-2024353033-A1 · Oct 24, 2024 · US
High-strength stainless steel for oil well and high-strength stainless steel pipe for oil well
US9303296B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9303296-B2 |
| Application number | US-201213607957-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 10, 2012 |
| Priority date | Apr 28, 2010 |
| Publication date | Apr 5, 2016 |
| Grant date | Apr 5, 2016 |
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.
A high-strength stainless steel for oil well having corrosion resistance excellent in a high-temperature environment, having excellent SSC resistance at normal temperature, and having better workability than 13% Cr steels has a chemical composition containing, by mass percent, C: at most 0.05%, Si: at most 1.0%, Mn: at most 0.3%, P: at most 0.05%, S: less than 0.002%, Cr: over 16% and at most 18%, Mo: 1.5 to 3.0%, Cu: 1.0 to 3.5%, Ni: 3.5 to 6.5%, Al: 0.001 to 0.1%, N: at most 0.025%, and O: at most 0.01%, the balance being Fe and impurities, a microstructure containing a martensite phase, 10 to 48.5%, by volume ratio, of a ferrite phase and at most 10%, by volume ratio, of a retained austenite phase, yield strength of at least 758 MPa and uniform elongation of at least 10%.
First claim
Opening claim text (preview).
The invention claimed is: 1. A high-strength stainless steel for oil well, having a chemical composition consisting of, by mass percent, C: at most 0.05%, Si: at most 1.0%, Mn: at most 0.17%, P: at most 0.05%, S: less than 0.002%, Cr: over 16% and at most 18%, Mo: 1.5 to 3.0%, Cu: 1.0 to 3.5%, Ni: 3.5 to 6.5%, Al: 0.001 to 0.1%, N: at most 0.025%, and O: at most 0.01%, the balance being Fe and impurities, a microstructure comprising a martensite phase, 10 to 48.5%, by volume ratio, of a ferrite phase and at most 10%, by volume ratio, of a retained austenite phase, yield strength of at least 758 MPa and uniform elongation of at least 10%. 2. A high-strength stainless steel pipe for oil well manufactured using the stainless steel according to claim 1 . 3. A high-strength stainless steel for oil well, having a chemical composition consisting of, by mass percent, C: at most 0.05%, Si: at most 1.0%, Mn: at most 0.17%, P: at most 0.05%, S: less than 0.002%, Cr: over 16% and at most 18%, Mo: 1.5 to 3.0%, Cu: 1.0 to 3.5%, Ni: 3.5 to 6.5%, Al: 0.001 to 0.1%, N: at most 0.025%, and O: at most 0.01, and at least one selected from the group consisting of V: at most 0.30%, Nb: at most 0.30%, Ti: at most 0.30%, and Zr: at most 0.30%, the balance being Fe and impurities, a microstructure comprising a martensite phase, 10 to 48.5%, by volume ratio, of a ferrite phase and at most 10%, by volume ratio, of a retained austenite phase, yield strength of at least 758 MPa and uniform elongation of at least 10%. 4. A high-strength stainless steel pipe for oil well manufactured using the stainless steel according to claim 3 . 5. A high-strength stainless steel for oil well, having a chemical composition consisting of, by mass percent, C: at most 0.05%, Si: at most 1.0%, Mn: at most 0.17%, P: at most 0.05%, S: less than 0.002%, Cr: over 16% and at most 18%, Mo: 1.5 to 3.0%, Cu: 1.0 to 3.5%, Ni: 3.5 to 6.5%, Al: 0.001 to 0.1%, N: at most 0.025%, and O: at most 0.01, and at least one selected from the group consisting of Ca: at most 0.005%, Mg: at most 0.005%, and B: at most 0.01%, the balance being Fe and impurities, a microstructure comprising a martensite phase, 10 to 48.5%, by volume ratio, of a ferrite phase and at most 10%, by volume ratio, of a retained austenite phase, yield strength of at least 758 MPa and uniform elongation of at least 10%. 6. A high-strength stainless steel pipe for oil well manufactured using the stainless steel according to claim 5 . 7. A high-strength stainless steel for oil well, having a chemical composition consisting of, by mass percent, C: at most 0.05%, Si: at most 1.0%, Mn: at most 0.17%, P: at most 0.05%, S: less than 0.002%, Cr: over 16% and at most 18%, Mo: 1.5 to 3.0%, Cu: 1.0 to 3.5%, Ni: 3.5 to 6.5%, Al: 0.001 to 0.1%, N: at most 0.025%, and O: at most 0.01, at least one selected from the group consisting of V: at most 0.30%, Nb: at most 0.30%, Ti: at most 0.30%, and Zr: at most 0.30%, and at least one selected from the group consisting of Ca: at most 0.005%, Mg: at most 0.005%, and B: at most 0.01%%, the balance being Fe and impurities, a microstructure comprising a martensite phase, 10 to 48.5%, by volume ratio, of a ferrite phase and at most 10%, by volume ratio, of a retained austenite phase, yield strength of at least 758 MPa and uniform elongation of at least 10%. 8. A high-strength stainless steel pipe for oil well manufactured using the stainless steel according to claim 7 .
Assignees
Inventors
Classifications
- C21D8/10Primary
during manufacturing of tubular bodies · CPC title
Workpiece with longitudinal passageway or stopweld material [e.g., for tubular stock, etc.] · CPC title
containing manganese · CPC title
with titanium or zirconium · CPC title
Ferrite · CPC title
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 US9303296B2 cover?
- A high-strength stainless steel for oil well having corrosion resistance excellent in a high-temperature environment, having excellent SSC resistance at normal temperature, and having better workability than 13% Cr steels has a chemical composition containing, by mass percent, C: at most 0.05%, Si: at most 1.0%, Mn: at most 0.3%, P: at most 0.05%, S: less than 0.002%, Cr: over 16% and at most 1…
- Who is the assignee on this patent?
- Ohe Taro, Amaya Hisashi, Takabe Hideki, and 3 more
- What technology area does this patent fall under?
- Primary CPC classification C21D8/10. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 05 2016 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).