US3997338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gray cast iron
Assignee: Centre de Recherches Scientifiques et L'industrie
•
Filing: 1975-03-20
•
Granted: 1976-12-14
•
Expires: 1995-03-20
Abstract
Abstract A gray cast iron is inoculated with 0.3 to 2% inoculating alloy, said inoculating alloy containing from 20 to 70% rare earths.
Inventors
- 👤 Jan Van Eeghem
- 👤 Charles Defrancq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:46
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/08; C21C1/10; C21C1/105
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
83 words
A high strength, low hardness, gray cast iron having a flake graphite structure having a composition consisting essentially of about 1- 3% 2- 4% carbon, up to 1% silicon, up to 0.7% manganese, up to 0.05% sulfur, up to 0.1% phosphorus and the balance iron, said gray iron having been inoculated with 0.3 to 2% of inoculant alloy, comprising rare earths as active inoculant component in a percentage which corresponds to the addition of 0.015 to 1.5% of rare earths to said composition.
Claim 2
Dependent Claim
83 words
A high strength, low hardness, gray cast iron having a flake graphite structure having a composition consisting essentially of about 1- 3% 2- 4% carbon, up to 1% silicon, up to 0.7% manganese, up to 0.05% sulfur, up to 0.1% phosphorus and the balance iron, said gray iron having been inoculated with 0.3 to 2% of inoculant alloy, comprising rare earths as active inoculant component in a percentage which corresponds to the addition of 0.015 to 1.5% of rare earths to said composition.
Claim 3
Dependent Claim
46 words
An iron according to claim 1, wherein said active inoculant component being present in the alloy in an amount effective to reduce the Brinell hardness of the as cast alloy by about 50 Brinell units in relation to normal silicon containing iron having the same strength.
Claim 4
Dependent Claim
26 words
An iron according to claim 1 wherein the percentage of active inoculant corresponds to the addition of 0.06 to 1.4% of rare earth to said composition.
Claim 5
Dependent Claim
26 words
An iron according to claim 3, wherein the percentage of active inoculant corresponds to the addition of 0.066 to 1.32% of rare earth to said composition.
Claim 6
Dependent Claim
15 words
An iron according to claim 1, wherein the inoculant alloy is comprised of misch metal.
Claim 7
Dependent Claim
15 words
An iron according to claim 2, wherein the inoculant alloy is comprised of misch metal.
Claim 8
Dependent Claim
37 words
An iron according to claim 1, having been inoculated with 0.3 to 0.8% of the inoculant alloy wherein the percentage of rare earths corresponds to the addition of 0.015 to 0.6% of rare earths to said composition.
Claim 9
Dependent Claim
26 words
An iron according to claim 1, wherein the inoculant alloy comprises a further active inoculant component selected from the group consisting of calcium, barium and strontium.
Claim 10
Dependent Claim
26 words
An iron according to claim 2, wherein the inoculant alloy comprises a further active inoculant component selected from the group consisting of calcium, barium and strontium.
Claim 11
Dependent Claim
78 words
A high strength, low hardness, gray cast iron having a flake graphite structure having a composition consisting essentially of about 1-3% aluminium, 2-4% carbon, up to 1% silicon, up to 0.7% manganese, up to 0.05% sulfur, up to 0.1% phosphorus and the balance iron, said gray iron having been inoculated with an inoculant alloy comprising rare earths as active inoculant component, in a percentage which corresponds to addition of 0.11 to 1.5% of rare earth to the composition.
Claim 12
Dependent Claim
78 words
A high strength, low hardness, gray cast iron having a flake graphite structure having a composition consisting essentially of about 1-3% aluminium, 2-4% carbon, up to 1% silicon, up to 0.7% manganese, up to 0.05% sulfur, up to 0.1% phosphorus and the balance iron, said gray iron having been inoculated with an inoculant alloy comprising rare earths as active inoculant component, in a percentage which corresponds to addition of 0.11 to 1.5% of rare earth to the composition.
Claim 13
Dependent Claim
46 words
An iron according to claim 10, wherein said active inoculant component being present in the alloy in an amount effective to reduce the Brinell hardness of the as cast alloy by about 50 Brinell units in relation to normal silicon containing iron having the same strength.
Claim 14
Dependent Claim
25 words
An iron according to claim 10, wherein the percentage of active inoculant corresponds to addition of 0.11 to 1.4% of rare earth to said composition.
Claim 15
Dependent Claim
25 words
An iron according to claim 12, wherein the percentage of active inoculant corresponds to addition of 0.11 to 1.32% of rare earth to said composition.
Claim 16
Dependent Claim
15 words
An iron according to claim 10, wherein the inoculant alloy is comprised of misch metal.
Claim 17
Dependent Claim
15 words
An iron according to claim 11, wherein the inoculant alloy is comprised of misch metal.
Claim 18
Dependent Claim
25 words
An iron according to claim 10, wherein the percentage of active inoculant corresponds to addition of 0.11 to 0.6% of rare earth to said composition.
Claim 19
Dependent Claim
26 words
An iron according to claim 10, wherein the inoculant alloy comprises a further active inoculant component selected from the group consisting of calcium, barium and strontium.
Claim 20
Dependent Claim
26 words
An iron according to claim 11, wherein the inoculant alloy comprises a further active inoculant component selected from the group consisting of calcium, barium and strontium.
References Cited (Backward Citations)
US2622022A
Cited
US2750284A
Cited
US3726670A
Cited
US3295963A
Cited
US3392013A
Cited
US3492118A
Cited
BE710679A
Cited
US3798027A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-12-14 | 1980-06-14 | 1980-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-14 | 1984-06-14 | 1984-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-14 | 1988-06-14 | 1988-12-14 | $7700.00 | Window Closed / Lapsed |