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US3871926A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for producing a composite metallic article

Assignee: Pulse Electronics Corp
•
Filing: 1974-02-04
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Granted: 1975-03-18
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Expires: 1994-02-04
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Abstract

Abstract A process is disclosed for producing a composite strip consisting essentially of a stainless steel layer and a brazing alloy layer metallurgically bonded together along a common interface. The process comprises heating under pressure a package consisting of a plate of stainless steel and a plate of the primary brazing alloy containing a thin foil of a second brazing alloy at the mutual interface of the stainless steel and primary brazing alloy to a temperature above the melting point of the second brazing alloy but below the melting point of the primary brazing alloy and below the recommended hot working temperature of the stainless steel, lowering the temperature of the package while still under pressure below the melting point of the second brazing alloy, removing the pressure and further lowering the temperature of the now bonded package below 900*F and above the martensitic transformation temperature, reducing the thickness of the package to a strip at temperatures above the martensitic transformation, and cooling the strip to ambient temperature. Alternatively, the process can comprise heating the steel alone to a temperature above its recommended solution heat treatment temperature, lowering the temperature to slightly above the melting point of the primary brazing alloy, applying under pressure a plate of the primary brazing alloy without the second lower melting brazing alloy lowering the temperature of the package under pressure after partial melting of the brazing alloy at the interface below the melting point of the brazing alloy, removing the pressure and further lowering the temperature of the new bonded package below 900*F and above the martensitic transformation temperature, reducing the thickness of the package to a strip at temperatures above the martensitic transformation, and cooling the strip to ambient temperature.

Inventors

  • 👤 James Q Steigelman

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-02 12:59
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/19; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 114 words
A PROCESS FOR PRODUCING A STRIP OF LAMINATED MATERIAL COMPRISING: A. HEATING A RELATIVELY THICK LAYER OF A STAINLESS STEEL ALLOY T A FIRST TEMPERATURE SUFFICIENT TO SOLUTION TREAT THE STAINLESS STEEL ALLOY, B. COOLING SAID ALLOY TO A SECOND TEMPERATURE FROM ABOUT 50*F TO ABOUT 200*F BELOW SAID FIRST TEMPERATURE, C. APPLYING A LAYER OF A BRAZING ALLOY TO ONE SURFACE OF SAID STAINLESS STEEL TO ACHIEVE A BOND ALONG A COMMON INTERFACE, D.COOLING THE RESULTINGLAMINATE TO A THIRD TEMPERATURE BELOW ABOUT 900*F AND ABOVE THE MARTENSITIC TRANSFORMATION TEMPERATURE, E. REDUCING THE THICKNESS OF THE LAMINATE WHILE AT SAID THIRD TEMPERATURE TO PRODUCE A STRIP AND F. COOLING SAID STRIP TO AMBIENT TEMPERATURE.
Claim 2
Dependent Claim 114 words
A PROCESS FOR PRODUCING A STRIP OF LAMINATED MATERIAL COMPRISING: A. HEATING A RELATIVELY THICK LAYER OF A STAINLESS STEEL ALLOY T A FIRST TEMPERATURE SUFFICIENT TO SOLUTION TREAT THE STAINLESS STEEL ALLOY, B. COOLING SAID ALLOY TO A SECOND TEMPERATURE FROM ABOUT 50*F TO ABOUT 200*F BELOW SAID FIRST TEMPERATURE, C. APPLYING A LAYER OF A BRAZING ALLOY TO ONE SURFACE OF SAID STAINLESS STEEL TO ACHIEVE A BOND ALONG A COMMON INTERFACE, D.COOLING THE RESULTINGLAMINATE TO A THIRD TEMPERATURE BELOW ABOUT 900*F AND ABOVE THE MARTENSITIC TRANSFORMATION TEMPERATURE, E. REDUCING THE THICKNESS OF THE LAMINATE WHILE AT SAID THIRD TEMPERATURE TO PRODUCE A STRIP AND F. COOLING SAID STRIP TO AMBIENT TEMPERATURE.
Claim 3
Dependent Claim 20 words
A process according to claim 1 wherein the original thickness of said stainless steel is greater than about 0.5 inches.
Claim 4
Dependent Claim 35 words
A process according to claim 2 wherein said first temperature is above about 1900*F, said second temperature is from about 1700*F to about 1850*F and said third temperature is from about 300*F to about 900*F.
Claim 5
Dependent Claim 15 words
A process according to claim 3 wherein said stainless steel is a martensitic stainless steel.
Claim 6
Dependent Claim 16 words
A process according to claim 4 wherein said stainless steel is a precipitation hardened stainless steel.
Claim 7
Dependent Claim 166 words
A process for producing a strip of laminated materials comprising: forming a laminated package consisting essentially of a plate of a stainless steel alloy, a primary brazing alloy and a thin foil of a secondary brazing alloy between the interfaces of said stainless steel alloy plate and said primary brazing alloy plate by inserting said foil between said interfaces, heating said package to a predetermined temperaturE above the melting point of the secondary brazing alloy and below the melting point of the primary brazing alloy and below the recommended hot working temperature of the stainless steel alloy while said package is under pressure, lowering the temperature of the package, while still under pressure to below the melting point of the secondary alloy, removing the pressure and further lowering the temperature of the now bonded package below about 900*F and above the martensitic transformation temperature, reducing the thickness of the package to a strip at temperatures above the martensitic transformation, and cooling the strip to ambient temperature.
Claim 8
Dependent Claim 166 words
A process for producing a strip of laminated materials comprising: forming a laminated package consisting essentially of a plate of a stainless steel alloy, a primary brazing alloy and a thin foil of a secondary brazing alloy between the interfaces of said stainless steel alloy plate and said primary brazing alloy plate by inserting said foil between said interfaces, heating said package to a predetermined temperaturE above the melting point of the secondary brazing alloy and below the melting point of the primary brazing alloy and below the recommended hot working temperature of the stainless steel alloy while said package is under pressure, lowering the temperature of the package, while still under pressure to below the melting point of the secondary alloy, removing the pressure and further lowering the temperature of the now bonded package below about 900*F and above the martensitic transformation temperature, reducing the thickness of the package to a strip at temperatures above the martensitic transformation, and cooling the strip to ambient temperature.
Claim 9
Dependent Claim 30 words
A process according to claim 6 wherein said secondary brazing alloy has a melting point below about 1800*F and said primary brazing alloy has a melting point below about 1900*F.
Claim 10
Dependent Claim 15 words
A process according to claim 7 wherein said stainless steel is a martensitic stainless steel.

References Cited (Backward Citations)

US2267342A Cited
US2718690A Cited
US2845365A Cited
US3173813A Cited
US3224088A Cited
US3615290A Cited
US3652344A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-03-17 1978-09-16 1979-03-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-03-17 1982-09-16 1983-03-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-03-17 1986-09-16 1987-03-18 $7700.00 Window Closed / Lapsed

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