Precipitation hardened martensitic stainless steel, manufacturing method therefor, and turbine moving blade and steam turbine using the same
US-2015315921-A1 · Nov 5, 2015 · US
Process for producing precipitation strengthening martensitic steel
US9777355B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9777355-B2 |
| Application number | US-201314402180-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 19, 2013 |
| Priority date | Sep 27, 2012 |
| Publication date | Oct 3, 2017 |
| Grant date | Oct 3, 2017 |
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.
There are provided a precipitation strengthening type martensitic steel having both a tensile strength of a 1500 MPa class and a high Charpy absorption energy of 30 J or higher, and a manufacturing process thereof. The precipitation strengthening type martensitic steel includes, in terms of mass %, 0.05% or less of C, 0.2% or less of Si, 0.4% or less of Mn, 7.5 to 11.0% of Ni, 10.5 to 13.5% of Cr, 1.75 to 2.5% of Mo, 0.9 to 2.0% of Al, less than 0.1% of Ti, and a remainder of Fe and impurities, and contains 0.1 to 6.0% of austenite in terms of a volume fraction.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for producing a precipitation strengthening martensitic steel comprising, in terms of mass %, 0.05% or less of C, 0.2% or less of Si, 0.4% or less of Mn, 7.5 to 11.0% of Ni, 10.5 to 13.5% of Cr, 1.75 to 2.5% of Mo, 0.9 to 2.0% of Al, less than 0.1% of Ti, and a remainder of Fe and impurity elements, an amount of each impurity element being less than 0.05%, wherein solution treatment is performed at 800 to 950° C. followed by aging treatment performed on the precipitation strengthening martensitic steel containing 0.1 to 5.0% of austenite in terms of a volume fraction, to obtain the precipitation strengthening martensitic steel having an austenite volume fraction of 2.0 to 6.0%, a tensile strength of 1500 MPa or higher, and an absorption energy obtained by a Charpy impact test of 30 J or higher. 2. The process for producing the precipitation strengthening martensitic steel according to claim 1 , wherein the aging treatment is performed at 490 to 540° C. 3. The process for producing the precipitation strengthening martensitic steel according to claim 1 , wherein the aging treatment is performed for more than 6 hours. 4. The process for producing the precipitation strengthening martensitic steel according to claim 2 , wherein the aging treatment is performed for more than 6 hours. 5. The process for producing the precipitation strengthening martensitic steel according to claim 1 , wherein the solution treatment is performed, followed by the aging treatment performed on the precipitation strengthening martensitic steel containing 1.0 to 5.0% of austenite in terms of a volume fraction. 6. The process for producing the precipitation strengthening martensitic steel according to claim 2 , wherein the solution treatment is performed, followed by the aging treatment performed on the precipitation strengthening martensitic steel containing 1.0 to 5.0% of austenite in terms of a volume fraction. 7. The process for producing the precipitation strengthening martensitic steel according to claim 3 , wherein the solution treatment is performed, followed by the aging treatment performed on the precipitation strengthening martensitic steel containing 1.0 to 5.0% of austenite in terms of a volume fraction. 8. The process for producing the precipitation strengthening martensitic steel according to claim 4 , wherein the solution treatment is performed, followed by the aging treatment performed on the precipitation strengthening martensitic steel containing 1.0 to 5.0% of austenite in terms of a volume fraction.
Assignees
Inventors
Classifications
containing Si · CPC title
containing Mn · CPC title
Austenite · CPC title
- C22C38/50Primary
with titanium or zirconium · CPC title
containing Cr and Ni · 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 US9777355B2 cover?
- There are provided a precipitation strengthening type martensitic steel having both a tensile strength of a 1500 MPa class and a high Charpy absorption energy of 30 J or higher, and a manufacturing process thereof. The precipitation strengthening type martensitic steel includes, in terms of mass %, 0.05% or less of C, 0.2% or less of Si, 0.4% or less of Mn, 7.5 to 11.0% of Ni, 10.5 to 13.5% of …
- Who is the assignee on this patent?
- Hitachi Metals Ltd
- What technology area does this patent fall under?
- Primary CPC classification C22C38/50. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Oct 03 2017 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).