US3798027A
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US
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Gray iron
Assignee: CENTRE RECH SCIENTIFIQUES L IND FABRICATIONS METALLIQUES BE
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Filing: 1971-12-15
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Granted: 1974-03-19
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Expires: 1991-12-15
Abstract
Abstract High strength low hardness gray iron consisting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1% silicon and the balance iron, said gray iron having been inoculated with a minimum of 0.3 percent of an inoculant alloy, the active inoculant of which is selected from the group consisting of calcium, barium and strontium.
Inventors
- 👤 C Defranco
- 👤 Eeghem J Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:36
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
93 words
A high strength low hardness gray iron consisting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1 percent silicon, up to 0.7 percent manganese, and the balance iron, said gray iron having been inoculated with 1 to 2 percent of an inoculant alloy, the active inoculant of which is selected from the group consisting of calcium, barium and strontium, said active inoculant being present in the alloy in an amount effective to reduce the Brinell Hardness of the as cast alloy by about 50 Brinell units.
Claim 2
Dependent Claim
103 words
A high strength low hardness gray iron consisting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1 percent silicon, up to 0.7 percent manganese, up to 0.05 percent sulfur, up to 0.1 percent phosphorus, and the balance iron, said gray iron having been inoculated with 1 to 2 percent of an inoculant alloy, the active inoculant of which is selected from the group consisting of calcium, barium and strontium, said active inoculant being present in the alloy in an amount effective to reduce the Brinell Hardness of the as cast alloy by about 50 Brinell units.
Claim 3
Dependent Claim
94 words
A high strength low hardness gray iron having a flake graphite structure and consisting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1 percent silicon and the balance iron, said gray iron having been inoculated with 1 to 2 percent of an inoculant alloy, the active inoculant of which is selected from the group consisting of calcium, barium and strontium, said active inoculant being present in the alloy in an amount effective to reduce the Brinell Hardness of the as cast alloy by about 50 Brinell units.
Claim 4
Dependent Claim
80 words
A high strength low hardness gray iron consisting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1 percent silicon and the balance iron, said gray iron having been inoculated with 1 to 2 percent of an inoculant alloy selected from the group consisting of SiCa consisting essentially of about 33 percent calcium and the balance being silicon and FeAlCa consisting essentially of about 40 percent iron, 40 percent aluminum and 20 percent calcium.
Claim 5
Dependent Claim
85 words
A high strength low hardness gray iron consIsting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1 percent silicon, up to 0.7 percent manganese and the balance iron, said gray iron having been inoculated with 1 to 2 percent of an inoculant alloy selected from the group consisting of SiCa consisting essentially of about 33 percent calcium and the balance being silicon and FeAlCa consisting essentially of about 40 percent iron, 40 percent aluminum and 20 percent calcium.
Claim 6
Dependent Claim
95 words
A high strength low hardness gray iron consisting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1 percent silicon, up to 0.7 percent manganese, up to 0.05 percent sulfur, up to 0.1 percent phosphorus and the balance iron, said gray iron having been inoculated with 1 to 2 percent of an inoculant alloy selected from the group consisting of SiCa consisting essentially of about 33 percent calcium and the balance being silicon and FeAlCa consisting essentially of about 40 percent iron, 40 percent aluminum and 20 percent calcium.
Claim 7
Dependent Claim
86 words
A high strength low hardness gray iron having a flake graphite structure and consisting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1 percent silicon and the balance iron, said gray iron having been inoculated with 1 to 2 percent of an inoculant alloy selected from the group consisting of SiCa consisting essentially of about 33 percent calcium and the balance being silicon and FeAlCa consisting essentially of about 40 percent iron, 40 percent aluminum and 20 percent calcium.
Claim 8
Dependent Claim
101 words
In a cast gray iron article having a chill depth in mm. of between about 0.5 and 2, said article consisting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1 percent silicon and the balance iron, said gray iron having been inoculated with 1 to 2 percent of an inoculant alloy, the active inoculant of which is selected from the group consisting of calcium, barium and strontium, said active inoculant being present in the alloy in an amount effective to reduce the Brinell Hardness of the as cast alloy by about 50 Brinell units.
Claim 9
Dependent Claim
106 words
In a cast gray iron article having a chill depth in mm. of between about 0.5 and 2, said article consisting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1 percent silicon, up to 0.7 percent manganese, and the balance iron, said gray iron having been inoculated with 1 to 2 percent of an inoculant alloy, the active inoculant of which is selected from the group consisting of calcium, barium and strontium, said active inoculant being present in the alloy in an amount effective to reduce the Brinell Hardness of the as cast alloy by about 50 Brinell units.
Claim 10
Dependent Claim
116 words
In a cast gray iron article having a chill depth in mm. of between about 0.5 and 2, said article consisting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1 percent silicon, up to 0.7 percent manganese, up to 0.05 percent sulfur, up to 0.1 percent phosphorus, and the balance iron, said gray iron having been inoculated with 1 to 2 percent of an inoculant alloy, the active inoculant of which is selected from the group consisting of calcium, barium and strontium, said active inoculant being present in the alloy in an amount effective to reduce the Brinell Hardness of the as cast alloy by about 50 Brinell units.
Claim 11
Dependent Claim
106 words
In a cast gray iron article having a flake graphite structure and a chill depth in mm. of between about 0.5 and 2, said article consisting essentially of about 1 - 3 percent aluminum, 2 - 4 percent carbon, up to 1 perceNt silicon and the balance iron, said gray iron having been inoculated with 1 to 2 percent of an inoculant alloy, the active inoculant of which is selected from the group consisting of calcium, barium and strontium, said active inoculant being present in the alloy in an amount effective to reduce the Brinell Hardness of the as cast alloy by about 50 Brinell units.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |