US4177326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for coating stainless steel with a lead-based alloy and article
Assignee: Vallourec Usines a Tubes de Lorraine Escaut SA
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Filing: 1977-12-16
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Granted: 1979-12-04
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Expires: 1997-12-16
Abstract
Abstract The invention relates to a process and installation for making stainless els coated with a lead-based alloy and having undergone annealing. The surface of the product is first prepared by mechanical treatment, then the product is pre-coated by known techniques such as hot tin-plating, after which the annealing treatment is effected, followed by the final coating. Such products may be used, inter alia, in the manufacture of car radiators.
Inventors
- 👤 Bernard A. M. Windal
- 👤 Edmond Lobry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:59
CPC Classifications
C; C23; C23C; C23C2/00; C23C2/003; C23C2/0038; C23C2/02; C23C2/022; C23C2/0222; C23C2/04; C23C2/10; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12701
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
92 words
Process for manufacturing a strip of annealed stainless steel having a lead-based alloy coating, comprising (a) mechanically preparing the surface of a stainless steel strip by cold rolling to remove oxide therefrom; (b) pre-coating said strip in a lead-based alloy bath; (c) heat treating the pre-coated strip by passing it through a second bath of the same alloy at an annealing temperature suifficient to render it deformable; and (d) finally coating said strip by passing it through a third bath of the same alloy at a temperature lower than said annealing temperature.
Claim 2
Dependent Claim
92 words
Process for manufacturing a strip of annealed stainless steel having a lead-based alloy coating, comprising (a) mechanically preparing the surface of a stainless steel strip by cold rolling to remove oxide therefrom; (b) pre-coating said strip in a lead-based alloy bath; (c) heat treating the pre-coated strip by passing it through a second bath of the same alloy at an annealing temperature suifficient to render it deformable; and (d) finally coating said strip by passing it through a third bath of the same alloy at a temperature lower than said annealing temperature.
Claim 3
Dependent Claim
21 words
The process of claim 1, wherein the mechanical preparation of said surface of said strip comprises polishing provoking a superficial cold-rolling.
Claim 4
Dependent Claim
31 words
The process of claim 1, wherein the mechanical preparation of said surface of said strip comprises a cold operation reducing the thickness of said strip and provoking cold-rolling in the mass.
Claim 5
Dependent Claim
12 words
The process of claim 1, wherein said steel is alloyed with chromium.
Claim 6
Dependent Claim
11 words
The process of claim 4, wherein said alloy contains 17% chromium.
Claim 7
Dependent Claim
15 words
The process of claim 1, wherein the coating alloy contains 80% lead and 20% tin.
Claim 8
Dependent Claim
40 words
The process of claim 6, wherein the temperature of the pre-coating bath and of the final coating bath is between 340° and 380° C., and the temperature of the bath for the annealing operation is between 700° and 800° C.
Claim 9
Dependent Claim
25 words
A product made of annealed stainless steel, the surface of which is coated with a protective lead-based alloy, obtained by the process of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |