US3962897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal working apparatus and methods of piercing
Assignee: Columbiana Foundry Co
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Filing: 1970-05-11
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Granted: 1976-06-15
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Expires: 1990-05-11
Abstract
Abstract A method and apparatus are provided for piercing metal members at high temperatures, particularly members containing slag inclusions, by the steps of urging said member, over a piercer point by rolling whereby said point passes through and forms an axial opening in the ingot, said point being formed of an alloy comprising 0.015% to 2% Carbon, about 5% to 65% Cobalt, about 15% to 35% Chromium and up to about 30% iron.
Inventors
- 👤 Lewis A. Way
- 👤 Robert C. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:11
CPC Classifications
B; B21; B21B; B21B19/00; B21B19/02; B21B19/04; B21B25/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
77 words
A method of piercing metal members, particularly members containing slag inclusions comprising the steps of urging said member at a temperature above about 1750°F over an as formed cast piercer point by rolling whereby said point passes through and forms an axial opening in the ingot, said point being formed of an alloy consisting essentially of about 0.015% to 2% carbon, about 5% to 65% cobalt, about 15% to 35% chromium and about up to 30% iron.
Claim 2
Independent Claim
77 words
A method of piercing metal members, particularly members containing slag inclusions comprising the steps of urging said member at a temperature above about 1750°F over an as formed cast piercer point by rolling whereby said point passes through and forms an axial opening in the ingot, said point being formed of an alloy consisting essentially of about 0.015% to 2% carbon, about 5% to 65% cobalt, about 15% to 35% chromium and about up to 30% iron.
Claim 3
Dependent Claim
35 words
A method of piercing metal as claimed in claim 1 wherein the alloy consists essentially of 0.03% to 1.5% carbon, about 40% to 65% cobalt, about 18% to 28% chromium and up to 12% iron.
Claim 4
Dependent Claim
36 words
A method of piercing metal as claimed in claim 1 wherein the alloy consists essentially of about 0.6% to 0.8% carbon, about 58% to 62% cobalt, about 18% to 28% chromium and up to 12% iron.
Claim 5
Dependent Claim
67 words
In a metal piercing apparatus for piercing elongated metal members at elevated temperatures the combination of at least two spaced apart cooperating rolls and a generally conical piercer point generally between said spaced rolls, said point being composed of an as formed cast alloy, consisting essentially of about 0.015% to 2% carbon, about 5% to 65% cobalt, about 15% to 35% chromium and up to 30% iron.
Claim 6
Dependent Claim
67 words
In a metal piercing apparatus for piercing elongated metal members at elevated temperatures the combination of at least two spaced apart cooperating rolls and a generally conical piercer point generally between said spaced rolls, said point being composed of an as formed cast alloy, consisting essentially of about 0.015% to 2% carbon, about 5% to 65% cobalt, about 15% to 35% chromium and up to 30% iron.
References Cited (Backward Citations)
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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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |