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
Method for manufacturing martensite-based precipitation strengthening stainless steel
US10000830B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10000830-B2 |
| Application number | US-201515512212-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 28, 2015 |
| Priority date | Sep 29, 2014 |
| Publication date | Jun 19, 2018 |
| Grant date | Jun 19, 2018 |
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Abstract
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The present invention is to provide a method for manufacturing a martensite-based precipitation strengthening stainless steel, which effectively enables crystal grains to become finer by improving a solution treatment method. The method for manufacturing a martensite-based precipitation strengthening stainless steel containing 0.01 to 0.05 mass % of C, 0.2 mass % or less of Si, 0.4 mass % or less of Mn, 7.5 to 11.0 mass % of Ni, 10.5 to 14.5 mass % of Cr, 1.75 to 2.50 mass % of Mo, 0.9 to 2.0 mass % of Al, less than 0.2 mass % of Ti, and Fe and impurities as a remainder, which is provided by the present invention, includes performing a solid solution treatment at 845 to 895° C. once or more.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for manufacturing a martensite-based precipitation strengthening stainless steel which contains 0.01 to 0.05 mass of C, 0.2 mass or less of Si, 0.4 mass or less of Mn, 7.5 to 11.0 mass of Ni, 10.5 to 14.5 mass of Cr, 1.75 to 2.50 mass of Mo, 0.9 to 2.0 mass of Al, less than 0.2 mass of Ti, and Fe and impurities as a remainder, wherein by performing a solid solution treatment at temperatures within a range of 845 to 895° C. for 0.5 to 3 hours multiple times, a crystal grain size number after the solid solution treatment becomes 7 or more, the crystal grain size number being measured by a method defined in ASTM-E112, and all of the solid solution treatments are performed at temperatures within the range of 845 to 895° C. 2. The method for manufacturing the martensite-based precipitation strengthening stainless steel according to claim 1 , wherein an aging treatment at 500 to 600° C. is performed for 1 to 24 hours after the last solid solution treatment is performed. 3. The method for manufacturing the martensite-based precipitation strengthening stainless steel according to claim 2 , wherein a sub-zero treatment is performed at temperatures within a range of −50 to −100° C. within 24 hours after the last solid solution treatment is performed and before the aging treatment.
Assignees
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Classifications
containing Cr and Ni · CPC title
Hardening by cooling below 0 degrees Celsius · CPC title
- C22C38/44Primary
with molybdenum or tungsten · CPC title
Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62) · CPC title
with titanium or zirconium · CPC title
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- What does patent US10000830B2 cover?
- The present invention is to provide a method for manufacturing a martensite-based precipitation strengthening stainless steel, which effectively enables crystal grains to become finer by improving a solution treatment method. The method for manufacturing a martensite-based precipitation strengthening stainless steel containing 0.01 to 0.05 mass % of C, 0.2 mass % or less of Si, 0.4 mass % or le…
- Who is the assignee on this patent?
- Hitachi Metals Ltd
- What technology area does this patent fall under?
- Primary CPC classification C22C38/44. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jun 19 2018 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).