US5277228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welded pipe with excellent corrosion resistance inner surface
Assignee: Usui Kokusai Sangyo Kaisha Ltd
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Filing: 1991-11-01
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Granted: 1994-01-11
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Expires: 2011-11-01
Abstract
Abstract Disclosed are a welded pipe with an excellent corrosion resistance, having two plate layers on the inner surface thereof, and a method of manufacturing it. The inner surface is coated with the plate layers even on the bead part and other steel foundation-exposed parts. A first plate layer of at least one of Ni, Co and Ni- or Co-base alloys is formed on at least one surface of a steel strip, then a second plate layer made of a metal or alloy having a lower melting point than the metal or alloy of forming the first plate layer is formed over the first plate layer. The thus plated steel strip is formed into a pipe and then heat-treated to give a welded pipe having no exposed steel foundation. The welded pipe has excellent corrosion resistance and workability.
Inventors
- 👤 Hiroshi Yamanashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:20
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/28; C23C10/34; C23C10/52; C25; C25D; C25D7/00; C25D7/04; C25D5/00; C25D5/10; F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/08; Y; Y10; Y10S; Y10S138/00; Y10S138/06; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49885
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A welded pipe, having excellent corrosion resistance at least on an inner surface thereof, comprising: metal strip welded together to form said pipe comprising a welding bead; a first plated layer, comprising Ni, Co and Ni- or Co-base alloys, disposed on the inner surface of said welded metal strip; and a second plated layer, comprising a single metal or alloy having a lower melting point than said first layer, disposed over said first layer and substantially covering said bead.
Claim 2
Dependent Claim
79 words
A welded pipe, having excellent corrosion resistance at least on an inner surface thereof, comprising: metal strip welded together to form said pipe comprising a welding bead; a first plated layer, comprising Ni, Co and Ni- or Co-base alloys, disposed on the inner surface of said welded metal strip; and a second plated layer, comprising a single metal or alloy having a lower melting point than said first layer, disposed over said first layer and substantially covering said bead.
Claim 3
Dependent Claim
30 words
The welded pipe having an excellent inner surface corrosion resistance as claimed in claim 1, further including a diffusion layer between said first plated layer and said second plated layer.
Claim 4
Dependent Claim
35 words
The welded pipe having an excellent inner surface corrosion resistance as claimed in claim 1 or 2, in which the second plated layer comprised at least one of sn, Sn-Zn, Sn-Ni, Ni-P, Ni-B and Ni-Zn.
Claim 5
Dependent Claim
35 words
The welded pipe having an excellent inner surface corrosion resistance as claimed in any one of claims 1 to 3, further comprising a subbing plate layer between said inner surface and said first plated layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-01-10 | 1997-07-12 | 1998-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-10 | 2001-07-12 | 2002-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-10 | 2005-07-12 | 2006-01-11 | $7700.00 | Window Closed / Lapsed |