Cr-containing austenitic alloy tube and method for producing the same
US-9255319-B2 · Feb 9, 2016 · US
Chromium-containing austenitic alloy
US9493860B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9493860-B2 |
| Application number | US-201314390058-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 28, 2013 |
| Priority date | Apr 4, 2012 |
| Publication date | Nov 15, 2016 |
| Grant date | Nov 15, 2016 |
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Abstract
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There is provided a chromium-containing austenitic alloy wherein at least one surface of the surfaces of the alloy has a continuous chromium oxide film with a thickness of 5 nm or more and less than 50 nm. A maximum current density determined by a critical passivation current density method is 0.1 μA/cm 2 or less when the chromium oxide film is continuous. A chemical composition of a base metal preferably consists of, by mass percent, C: 0.15% or less, Si: 1.00% or less, Mn: 2.0% or less, P: 0.030% or less, S: 0.030% or less, Cr: 10.0 to 40.0%, Ni: 8.0 to 80.0%, Ti: 0.5% or less, Cu: 0.6% or less, Al: 0.5% or less, and N: 0.20% or less, the balance being Fe and impurities.
First claim
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What is claimed is: 1. A chromium-containing austenitic alloy wherein a chemical composition of a base metal consists of, by mass percent, C: 0.15% or less, Si: 1.00% or less, Mn: 2.0% or less, P: 0.030% or less, S: 0.030% or less, Cr: 10.0 to 40.0%, Ni: 55 to 80.0%, Ti: 0.5% or less, Cu: 0.6% or less, Al: 0.5% or less, and N: 0.20% or less, the balance being Fe and impurities, wherein at least one surface of the surfaces of the alloy has a continuous chromium oxide film with a thickness of 5 nm or more and less than 50 nm and further wherein a maximum current density determined by a critical passivation current density is 0.1 μA/cm 2 or lower. 2. The chromium-containing austenitic alloy according to claim 1 , wherein the alloy is used as a member for a nuclear plant.
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Classifications
with copper · CPC title
1 mil or less · CPC title
- C22C19/058Primary
without Mo and W · CPC title
Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title
with chromium · CPC title
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- What does patent US9493860B2 cover?
- There is provided a chromium-containing austenitic alloy wherein at least one surface of the surfaces of the alloy has a continuous chromium oxide film with a thickness of 5 nm or more and less than 50 nm. A maximum current density determined by a critical passivation current density method is 0.1 μA/cm 2 or less when the chromium oxide film is continuous. A chemical composition of a base meta…
- Who is the assignee on this patent?
- Nippon Steel & Sumitomo Metal Corp
- What technology area does this patent fall under?
- Primary CPC classification C22C19/058. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 15 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 2 related publications on this page (citations in our corpus or others sharing the same primary CPC).