Cr-containing austenitic alloy tube and method for producing the same
US9255319B2 · kind B2 · utility
2Cited by
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8Claims
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Key dates
| Filing date | Aug 12, 2011 |
| Grant date | Feb 9, 2016 |
| Priority date | — |
| Expiry date | Jan 25, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E30/30
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
There is provided a Cr-containing austenitic alloy tube, wherein a chromium oxide film with a thickness of 0.05 to 1.5 μm having the relationship defined by Formula (i) is formed on the inner surface of the tube, wherein the average concentration of C in the depth range of 5 to 10 μm from the inner surface is lower than the concentration of C in a base metal;0.4≦δ1/δ2≦2.5 (i)wherein δ1 and δ2 are thicknesses (μm) of the chromium oxide film at both ends of tube, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.