Patent US3956809A successfully refreshed from Google Patents.
US3956809A
Expired / Lapsed
US
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Pressure bonded composite material with low yield strength
Assignee: Allegheny Ludlum Corp
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Filing: 1974-05-01
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Granted: 1976-05-18
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Expires: 1994-05-01
Abstract
Abstract A composite material which has a substantially reduced incidence of defects after drawing, and a method of producing it. The composite material is comprised of at least one layer of plain carbon steel containing up to 1.5% of carbide former present in a carbide former-to-carbon ratio of from about 1.5 to about 25 and at least one layer of stainless steel. It is formed by pressure bonding carbon steel containing carbide former to stainless steel.
Inventors
- 👤 Joseph A. Chivinsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:33
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/227; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/94; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965; Y10T428/12972; Y10T428/12979
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
A pressure bonded composite material comprising a first layer bonded to at least one layer of stainless steel along a joining interface which is substantially free from enriched carbide areas; said first layer consisting essentially of plain carbon steel containing up to 0.75% of carbide former from the group consisting of titanium and columbium, said carbide former being present in a carbide former-to-carbon ratio of from 5 to 15; said composite material having a 0.2% yield strength of less than 50,000 pounds per square inch.
Claim 2
Dependent Claim
85 words
A pressure bonded composite material comprising a first layer bonded to at least one layer of stainless steel along a joining interface which is substantially free from enriched carbide areas; said first layer consisting essentially of plain carbon steel containing up to 0.75% of carbide former from the group consisting of titanium and columbium, said carbide former being present in a carbide former-to-carbon ratio of from 5 to 15; said composite material having a 0.2% yield strength of less than 50,000 pounds per square inch.
Claim 3
Dependent Claim
13 words
A composite material according to claim 1 wherein said carbide former is titanium.
Claim 4
Dependent Claim
21 words
A composite material according to claim 1 wherein at least one layer of said stainless steel is Type 304 stainless steel.
Claim 5
Dependent Claim
20 words
A composite material according to claim 1 wherein said first layer has an ASTM grain size of at least 3.
Claim 6
Dependent Claim
24 words
A composite material according to claim 1 comprising two layers of stainless steel with a layer of said steel containing carbide former sandwiched therebetween.
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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |