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US4013425A
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Thermometric bimetallic structure of high strength at high temperature
Assignee: GEA Group AG
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Filing: 1976-06-22
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Granted: 1977-03-22
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Expires: 1996-06-22
Abstract
Abstract A thermometric bimetallic structure of high strength at elevated temperatures of, say, 500° C to 700° C, comprises an active component and a passive component secured together, the active component having a coefficient of thermal expansion of about 19 × 10 - 6 °C - 1 to 22 × 10 - 6 ° C - 1 while the passive component has a coefficient of expansion of 3 × 10 - 6 ° C - 1 to 12 × 10 - 6 ° C - 1 . The active component, which expands to a substantially greater extent than the passive component upon heating, consists of 0.4 to 0.9% by weight carbon, 0.03 to 0.1% by weight nitrogen, 10 to 14% by weight nickel, 3 to 7% by weight manganese, 0.2 to 1% by weight niobium and/or tantalum, 0.5 to 1.5% by weight vanadium, up to 1.5% by weight molybdenum, up to 1.5% by weight tungsten, up to 3.5% by weight chromium, up to 0.5% by weight silicon and the balance iron and unavoidable impurities resulting from the melting of the ingredients to form the alloy. The laminate of the two components can be cold worked to improve its hardness.
Inventors
- 👤 Horst Muhlberger
- 👤 Manfred Ruhle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:47
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/08; G; G12; G12B; G12B1/00; G12B1/02; H; H01; H01H; H01H37/00; H01H37/02; H01H37/32; H01H37/52; H01H2037/526; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/125; Y10T428/12521
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
162 words
A thermometric bimetallic structure having high strength at elevated temperature and comprising an active component and a passive component secured together, said active component consisting of an iron-nickel alloy having a coefficient of expansion of about 19 × 10 - 6 ° C - 1 to 22 × 10 - 6 × ° C - 1 and composed by weight of ______________________________________
0.4% to 0.9% carbon,
0.03% to 0.10%
nitrogen,
10.0% to 14.0%
nickel,
3.0% to 7.0% manganese,
0.2% to 1.0% niobium and/or tantalum,
0.5% to 1.5% vanadium,
up to 1.5% molybdenum,
up to 1.5% tungsten,
up to 3.5% chromium,
up to 0.5% silicon, and
balance iron with impurities which are due
to the melting conditions,
______________________________________ the total of vanadium, molybdenum and tungsten being at most 2%; the passive component being metallic and having a coefficient of expansion of about 3 × 10 - 6 ° C - 1 to 12 × 10 - 6 × ° C - 1 .
Claim 2
Dependent Claim
162 words
A thermometric bimetallic structure having high strength at elevated temperature and comprising an active component and a passive component secured together, said active component consisting of an iron-nickel alloy having a coefficient of expansion of about 19 × 10 - 6 ° C - 1 to 22 × 10 - 6 × ° C - 1 and composed by weight of ______________________________________
0.4% to 0.9% carbon,
0.03% to 0.10%
nitrogen,
10.0% to 14.0%
nickel,
3.0% to 7.0% manganese,
0.2% to 1.0% niobium and/or tantalum,
0.5% to 1.5% vanadium,
up to 1.5% molybdenum,
up to 1.5% tungsten,
up to 3.5% chromium,
up to 0.5% silicon, and
balance iron with impurities which are due
to the melting conditions,
______________________________________ the total of vanadium, molybdenum and tungsten being at most 2%; the passive component being metallic and having a coefficient of expansion of about 3 × 10 - 6 ° C - 1 to 12 × 10 - 6 × ° C - 1 .
Claim 3
Dependent Claim
63 words
The thermometric bimetallic defined in claim 1, wherein the active component is composed by weight of ______________________________________
0.60% to 0.75%
carbon,
0.05% to 0.08%
nitrogen,
11.5% to0 12.5%
nickel,
4.5% to 5.5% manganese,
0.2% to 0.5% tungsten and/or tantalum,
0.9% to 1.2% vanadium,
2.5% to 3.5% chromium,
less than 0.3%
silicon,
less than 0.02%
phosphorus,
less than 0.02%
sulfur, and
balance iron.
______________________________________
Claim 4
Dependent Claim
74 words
The thermometric bimetallic structure defined in claim 1 wherein the passive component has a coefficient of expansion of about 5 × 10 - 6 × ° C - 1 and is composed by weight of ______________________________________
less than 0.5%
manganese,
less than 0.03%
carbon,
less than 0.2%
silicon,
16 to 20% cobalt,
27 to 31% nickel,
up to 0.5% molybdenum, and the
balance iron with impurities which are due
to the melting conditions.
______________________________________
Claim 5
Dependent Claim
29 words
The thermometric bimetallic structure defined in claim 3 wherein the molybdenum is present in said passive component in an amount ranging between 0.1% by weight to 0.5% by weight.
Claim 6
Dependent Claim
25 words
The thermometric bimetallic structure defined in claim 3 wherein said cobalt is present in an amount of about 18% by weight in said passive component.
Claim 7
Dependent Claim
24 words
The thermometric bimetallic structure defined in claim 3 wherein said nickel is present in an amount of 29% by weight of said passive component.
Claim 8
Dependent Claim
100 words
A thermometric bimetallic structure as defined in claim 1 wherein the passive component has a coefficient of expansion of 11 × 10 - 6 ° C - 1 to 12 × 10 - 6 × ° C - 1 and is composed by weight of ______________________________________
less than 0.5%
carbon,
less than 1% manganese,
less than 1.5%
silicon,
less than 2% aluminum
12% to 25% chromium,
up to 3.5% titanium
up to 6.0% niobium and/or tantalum,
up to 2% molybdenum and/or tungsten,
up to 1% vanadium, and the
balance iron with impurities which are due
to the melting conditions.
______________________________________
Claim 9
Dependent Claim
49 words
A thermometric bimetallic structure as defined in claim 1 wherein the passive component is composed by weight of ______________________________________
less than 0.10%
carbon,
less than 1.0%
silicon,
less than 1.0%
manganese,
15.5% to 17.5%
chromium, and the
balance iron with impurities which are due
to the melting conditions.
______________________________________
Claim 10
Dependent Claim
39 words
A thermometric bimetallic structure as defined in claim 1 wherein the passive component consists of titanium or of a titanium alloy having a coefficient of expansion of about 10 × 10 - 6 × ° C - 1 .
Claim 11
Dependent Claim
54 words
The thermometric bimetallic structure defined in claim 1 wherein the passive component consists of molybdenum or a molybdenum alloy which contains at least 98% molybdenum and has a coefficient of expansion of 4 × 10 - 6 × ° C - 1 to 6 × 10 - 6 × ° C - 1 .
Claim 12
Dependent Claim
30 words
The thermometric bimetallic structure defined in claim 1 wherein an electrically conductive interlayer consisting of nickel or copper or of an alloy of both metals is interposed between said components.
Claim 13
Dependent Claim
25 words
The thermometric bimetallic structure defined in claim 1 wherein the surface of at least the active metal component has a scale-resisting metallic or non-metallic coating.
Claim 14
Dependent Claim
18 words
The thermometric bimetallic structure defined in claim 1 which has been cold formed to a deformation of 20-90%.
Claim 15
Dependent Claim
15 words
The thermometric bimetallic structure defined in claim 13 wherein said deformation is 30 to 60%.
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |