Patent US3915666A successfully refreshed from Google Patents.
US3915666A
Expired / Lapsed
US
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Steel composite having resistance to carbon diffusion
Assignee: Voestalpine AG
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Filing: 1974-08-09
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Granted: 1975-10-28
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Expires: 1994-08-09
Abstract
Abstract The invention relates to a clad moulded body comprising a base body of carbon containing steel and a carbon diffusion inhibiting a layer joining to said base body and representing an intermediate layer to a cladding layer of highly alloyed, preferably corrosion resistant steel, or being such cladding layer itself, wherein the improvement resides in that such layer joining said base body is made of a steel comprising 0.05 %, 1.0 to 6 % Si, 1.0 to 12 % Mn, and 0 to 0.8 % N. The main advantage gained by employing such steel lies in avoiding an excessive decarburization at the transition from the base material to the intermediate layer, and an excessive carburization immediately in the area of the bonding plane.
Inventors
- 👤 Giswalt Veitl
- 👤 Herbert Zitter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:30
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; B32B15/011; C; C22; C22C; C22C38/00; C22C38/04; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9335; Y10S428/941; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12965
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
175 words
A COLD-SHAPABLE COMPOSITE BODY HAVING INCREASED RESISTANCE TO CARBON DIFFUSION ACROSS THE BODY AT ELEVATED TEMPERATURES WHICH CONSIST ESSENTIALLY OF A CARBON-CONTAINING STEEL BASE BODY, AN INTERMEDIATE CARBON DIFFUSION INHIBITING STEEL LAYER BONDED TO SAID STEEL BASE, SAID INTERMEDIATE LAYER CONSISTING ESSENTIALLY OF UP TO 0.05 % C, 1.0 TO 6 % SI, 1.0 TO 12 % MN, 0 TO 0.8 % N, 0 TO 0.025 % P, 0 TO 0.020 % S, 12 TO 25 % CR, 8 TO 25 % NI, BALANCE FE, AND A CLADDING LAYER BONDED TO SAID INTERMEDIATE LAYER, SAID CLADDING LAYER CONSISING ESSENTIALLY OF A LOW CARBON-CONTAINING, HIGHLY ALLOYED, CORROSION RESISTANT STEEL, WHEREIN SAID INTERMEDIATE LAYER SUBSTANTIALLY PREVENTS CARBON DIFFUSION FROM THE BASE BODY TO THE CLADDING LAYER AND CARBIDE ENRICHMENT IN SAID INTERMEDIATE LAYER, THE CARBON CONTENT OF THE BASE BODY AND THE CLADDING LAYER BEING SUCH THAT CARBON WOULD TEND TO DIFFUSE FROM THE BASE BODY INTO THE CLADDING LAYER AT A BONDING THEREBETWEEN AT ELEVATED TEMPERATURE IN THE ABSENCE OF THE SAID INTERMEDIATE CARBON DIFFUSING LAYER.
Claim 2
Dependent Claim
175 words
A COLD-SHAPABLE COMPOSITE BODY HAVING INCREASED RESISTANCE TO CARBON DIFFUSION ACROSS THE BODY AT ELEVATED TEMPERATURES WHICH CONSIST ESSENTIALLY OF A CARBON-CONTAINING STEEL BASE BODY, AN INTERMEDIATE CARBON DIFFUSION INHIBITING STEEL LAYER BONDED TO SAID STEEL BASE, SAID INTERMEDIATE LAYER CONSISTING ESSENTIALLY OF UP TO 0.05 % C, 1.0 TO 6 % SI, 1.0 TO 12 % MN, 0 TO 0.8 % N, 0 TO 0.025 % P, 0 TO 0.020 % S, 12 TO 25 % CR, 8 TO 25 % NI, BALANCE FE, AND A CLADDING LAYER BONDED TO SAID INTERMEDIATE LAYER, SAID CLADDING LAYER CONSISING ESSENTIALLY OF A LOW CARBON-CONTAINING, HIGHLY ALLOYED, CORROSION RESISTANT STEEL, WHEREIN SAID INTERMEDIATE LAYER SUBSTANTIALLY PREVENTS CARBON DIFFUSION FROM THE BASE BODY TO THE CLADDING LAYER AND CARBIDE ENRICHMENT IN SAID INTERMEDIATE LAYER, THE CARBON CONTENT OF THE BASE BODY AND THE CLADDING LAYER BEING SUCH THAT CARBON WOULD TEND TO DIFFUSE FROM THE BASE BODY INTO THE CLADDING LAYER AT A BONDING THEREBETWEEN AT ELEVATED TEMPERATURE IN THE ABSENCE OF THE SAID INTERMEDIATE CARBON DIFFUSING LAYER.
Claim 3
Dependent Claim
49 words
The composite body of claim 1 wherein said intermediate layer consists essentially of 0 to 0.03 % C, 3.5 to 4.5 % Si, 1 to 2 % Mn, 0 to 0.025 % P, 0 to 0.020 % S, 17 to 19 % Cr, and 14 to 16 % Ni.
Claim 4
Dependent Claim
19 words
The composite body of claim 2 wherein said intermediate layer has a thickness of at least about 0.02 mm.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |