US4038067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon-free casting powder for ingot casting and continuous casting
Assignee: Nippon Steel Corp
•
Filing: 1976-06-08
•
Granted: 1977-07-26
•
Expires: 1996-06-08
Abstract
Abstract A casting powder to be used for ingot casting and continuous casting of steel which contains substantially no carbon particles. It contains, instead of carbon particles, BN or other nitrides as an agent for adjusting fusion rate of the casting powder so as to fully prevent carburization and carbon pick-up caused by the carbon particles which has heretofore been added to the powder for control of the fusion rate. This new casting powder may contain a reducing agent in addition to the nitride.
Inventors
- 👤 Hidemaro Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:20
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/10; B22D11/11
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
54 words
A casting composition for preventing carburization of steel during the casting thereof, said composition comprising a powdery basic material, and particles of a nitride material contained in said basic material as a skeleton therefor, said nitride material being in particle size of 50 mesh or finer, said basic materials containing substantially no carbon particles.
Claim 2
Dependent Claim
54 words
A casting composition for preventing carburization of steel during the casting thereof, said composition comprising a powdery basic material, and particles of a nitride material contained in said basic material as a skeleton therefor, said nitride material being in particle size of 50 mesh or finer, said basic materials containing substantially no carbon particles.
Claim 3
Dependent Claim
28 words
The casting composition according to claim 1 in which said nitride material is included in an amount of 2 to 10% by weight based on the casting composition.
Claim 4
Dependent Claim
36 words
The casting composition according to claim 1 in which the nitride material is selected from the group consisting of BN, Si 3 N 4 , MnN, Cr 2 N, Fe 4 N, AlN, TiN, and ZrN.
Claim 5
Dependent Claim
36 words
The casting composition according to claim 2 in which the nitride material is selected from the group consisting of BN, Si 3 N 4 , MnN, Cr 2 N, Fe 4 N, AlN, TiN and ZrN.
Claim 6
Dependent Claim
24 words
The casting composition according to claim 1 further including a reducing agent, said reducing agent being in particle size of 50 mesh or finer.
Claim 7
Dependent Claim
27 words
The casting composition according to claim 5 in which said reducing agent is present in an amount of 1 to 10% by weight of the casting composition.
Claim 8
Dependent Claim
30 words
The casting composition according to claim 5 in which the reducing agent is selected from the group consisting of Al metal, Ca metal, Si metal, Ca alloy and Si alloy.
Claim 9
Dependent Claim
30 words
The casting composition according to claim 6 in which the reducing agent is selected from the group consisting of Al metal, Ca metal, Si metal, Ca alloy and Si alloy.
Claim 10
Dependent Claim
46 words
The casting composition according to claim 1 in which the relation of the skeleton particles mixing ratio (C%) with the diameter ratio (D/d) of the basic material particles to the skeleton particles is defined by the formula: log C ≧ - 0.9 log D/d + 1.1
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |