US4357397A
Expired / Lapsed
US
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Brazing fin stock for use in aluminum base alloy heat exchanger
Assignee: Sumitomo Light Metal Industries Ltd
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Filing: 1980-07-28
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Granted: 1982-11-02
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Expires: 2000-07-28
Abstract
Abstract A sacrificial brazing fin stock for use in an aluminum base alloy heat exchanger comprises an aluminum base alloy core having a grain size of 100 mu m or more and consisting essentially of 0.5 to 2 wt. % manganese plus iron, said manganese being more than iron, 0.1 to 0.7 wt. % zinc, 0.001 to less than 0.02 wt. % tin, and balance aluminum and a cladding consisting of one material selected from an Al-Si base alloy and an Al-Si-Mg base alloy. The above fin stock protected a main tube of the heat exchanger from a pitting corrosion and led to a greatly expanded use of the aluminum base alloy heat exchanger.
Inventors
- 👤 Yoshio Baba
- 👤 Zenichi Tanabe
- 👤 Toshiyasu Fukui
- 👤 Hiroshi Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:05
CPC Classifications
F; F28; F28F; F28F21/00; F28F21/08; F28F21/081; F28F21/084; B; B23; B23K; B23K1/00; B23K1/19; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/286; B32; B32B; B32B15/00; B32B15/01; B32B15/016; C; C23; C23F; C23F13/00; C23F13/02; C23F13/06; C23F13/08; C23F13/10; C23F13/12; C23F13/14; F28F1/00; F28F1/10; F28F1/12; C23F2213/00; C23F2213/30; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12764
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A brazing fin stock comprising a core clad with a cladding layer, said core having a grain size of 100 μm or more and being made of an aluminum base alloy consisting essentially of from 0.5 to 2 wt.% of manganese plus iron, wherein the amount of said manganese is greater than the amount of said iron and the amount of said iron being an amount effective to increase the strength of said core and to provide a grain size of said core of 100 μm or more, from 0.1 to 0.7 wt.% of zinc, from 0.001 to less than 0.02 wt.% of tin and the balance is aluminum, said cladding layer being made of an alloy consisting essentially of from 5 to 15 wt.% of silicon and the balance is aluminum.
Claim 2
Dependent Claim
132 words
A brazing fin stock comprising a core clad with a cladding layer, said core having a grain size of 100 μm or more and being made of an aluminum base alloy consisting essentially of from 0.5 to 2 wt.% of manganese plus iron, wherein the amount of said manganese is greater than the amount of said iron and the amount of said iron being an amount effective to increase the strength of said core and to provide a grain size of said core of 100 μm or more, from 0.1 to 0.7 wt.% of zinc, from 0.001 to less than 0.02 wt.% of tin and the balance is aluminum, said cladding layer being made of an alloy consisting essentially of from 5 to 15 wt.% of silicon and the balance is aluminum.
Claim 3
Dependent Claim
34 words
A brazing fin stock comprising a core clad with a cladding layer, said core having a grain size of 100 μm or more and being made of an aluminum base alloy consisting essentially of
Claim 4
Dependent Claim
34 words
A brazing fin stock comprising a core clad with a cladding layer, said core having a grain size of 100 μm or more and being made of an aluminum base alloy consisting essentially of
Claim 5
Dependent Claim
105 words
from 0.5 to 2 wt.% of manganese plus iron, wherein the amount of said manganese is greater than the amount of said iron and the amount of said iron being an amount effective to increase the strength of said core and to provide a grain size of said core of 100 μm or more, from 0.1 to 0.7 wt.% of zinc, from 0.001 to less than 0.02 wt.% of tin and the balance is aluminum, said cladding layer being made of an alloy consisting essentially of from 5 to 15 wt.% of silicon, from 0.1 to 2 wt.% of magnesium and the balance is aluminum.
Claim 6
Dependent Claim
105 words
from 0.5 to 2 wt.% of manganese plus iron, wherein the amount of said manganese is greater than the amount of said iron and the amount of said iron being an amount effective to increase the strength of said core and to provide a grain size of said core of 100 μm or more, from 0.1 to 0.7 wt.% of zinc, from 0.001 to less than 0.02 wt.% of tin and the balance is aluminum, said cladding layer being made of an alloy consisting essentially of from 5 to 15 wt.% of silicon, from 0.1 to 2 wt.% of magnesium and the balance is aluminum.
Claim 7
Dependent Claim
144 words
A brazing fin stock comprising a core clad with a cladding layer, said core having a grain size of 100 μm or more and being made of an aluminum base alloy consisting essentially of from 0.5 to 2 wt.% of manganese plus iron, wherein the amount of said manganese is greater than the amount of said iron and the amount of said iron being an amount effective to increase the strength of said core and to provide a grain size of said core of 100 μm or more, from 0.1 to 0.7 wt.% of zinc, from 0.001 to less than 0.02 wt.% of tin and the balance is aluminum, said cladding layer being made of an alloy consisting essentially of from 5 to 15 wt.% of silicon, from 0.001 to 0.2 wt.% of bismuth, from 0.001-0.1 wt.% of beryllium and the balance is aluminum.
Claim 8
Dependent Claim
144 words
A brazing fin stock comprising a core clad with a cladding layer, said core having a grain size of 100 μm or more and being made of an aluminum base alloy consisting essentially of from 0.5 to 2 wt.% of manganese plus iron, wherein the amount of said manganese is greater than the amount of said iron and the amount of said iron being an amount effective to increase the strength of said core and to provide a grain size of said core of 100 μm or more, from 0.1 to 0.7 wt.% of zinc, from 0.001 to less than 0.02 wt.% of tin and the balance is aluminum, said cladding layer being made of an alloy consisting essentially of from 5 to 15 wt.% of silicon, from 0.001 to 0.2 wt.% of bismuth, from 0.001-0.1 wt.% of beryllium and the balance is aluminum.
Claim 9
Dependent Claim
29 words
A brazing fin stock according to claim 1, claim 2 or claim 3, in which said aluminum base alloy for said core contains at least 0.25 wt.% of iron.
Claim 10
Dependent Claim
30 words
A brazing fin stock according to claim 1, claim 2 or claim 3, in which said aluminum base alloy for said core contains from 0.25 to 0.45 wt.% of iron.
Claim 11
Dependent Claim
65 words
A brazing fin stock as claimed in claim 1, claim 2 or claim 3, in which said core has been prepared by hot rolling said aluminum base alloy at a temperature of from 450° to 550° C. and then recrystallization annealed by heating to a temperature of at least 300° C. for 30 minutes or more until the grain size is 100 μm or more.
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) | 1985-11-01 | 1986-05-03 | 1986-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-01 | 1990-05-03 | 1990-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-01 | 1994-05-03 | 1994-11-02 | $7700.00 | Window Closed / Lapsed |