US3766962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of continuously casting a slab
Assignee: Individual
•
Filing: 1971-02-01
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Granted: 1973-10-23
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Expires: 1991-02-01
Abstract
Abstract A method of continuous casting steel into a wide-faced continuous slab is disclosed wherein the oppositely disposed wide faces of the outer shell of the cast slab are concavely arched to resist outward bulging due to the ferrostatic head of the molten core. The cast strip is passed between spaced pairs of guide rollers which bear against only the opposite edges of the strip and also buttress the strip against the internal ferrostatic head of the molten core. Therefore, the necessity of guide rollers that bear against the wide surfaces of the strip is eliminated, allowing uniform application of coolant liquid to the wide surfaces, thus greatly enhancing the rate of solidification of the strip.
Inventors
- 👤 I Rossi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:33
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/04; B22D11/043; B22D11/14; B22D11/142
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
150 words
The method of continuous metal casting which comprises: casting said metal from a molten state into a continuous slab comprising a thin walled shell of solidified metal and a core of molten metal, said shell having a width which is substantially greater than its thickness and having formed across its width, oppositely-disposed concavely arched and relatively wide sidewalls, and having formed across its thickness oppositely disposed and relatively narrow end walls, subjecting said shell as cast to inwardly directed restraining pressure applied to its opposite end walls to prevent medial outward bulging of the sidewalls of said shell due to ferrostatic pressure of said molten core while leaving the corresponding arched surfaces of said sidewalls substantially free of mechanical engagement thereby permitting continuous surface cooling of said slab throughout the length and width of said concavely arched surfaces, until said slab is solidified, and while concurrently directionally feeding said slab.
Claim 2
Independent Claim
150 words
The method of continuous metal casting which comprises: casting said metal from a molten state into a continuous slab comprising a thin walled shell of solidified metal and a core of molten metal, said shell having a width which is substantially greater than its thickness and having formed across its width, oppositely-disposed concavely arched and relatively wide sidewalls, and having formed across its thickness oppositely disposed and relatively narrow end walls, subjecting said shell as cast to inwardly directed restraining pressure applied to its opposite end walls to prevent medial outward bulging of the sidewalls of said shell due to ferrostatic pressure of said molten core while leaving the corresponding arched surfaces of said sidewalls substantially free of mechanical engagement thereby permitting continuous surface cooling of said slab throughout the length and width of said concavely arched surfaces, until said slab is solidified, and while concurrently directionally feeding said slab.
Claim 3
Dependent Claim
69 words
The method according to claim 1 wherein said slab is cast with edge portions of said slab contiguous to said concave surfaces which are bevelled substantially normal thereto, and wherein at least a portion of said restraining pressure is applied substantially normal to said bevelled edge portions for buttressing said arched sidewalls against bulging due to ferrostatic pressure and for controlling the degree of concavity of said arched sidewalls.
Claim 4
Dependent Claim
60 words
The method according to claim 2 wherein said shell is cast with the termination portions of the arched sidewalls of the shell homogeneous with said end walls which are so shaped to take the thrust of the arched sidewalls and wherein said end walls are normal to a transverse axis through the slab and are supported by roLling restraining pressure.
Claim 5
Dependent Claim
81 words
The method according to claim 1 wherein rolling pressure is additionally applied to bend and direct said continuous slab into tangency at a given location, with a predetermined direction of traverse, continually so controlling the cooling of said slab that at said given location, said slab is in a hot and relatively plastic state thereby facilitating straightening said slab while moving the same from the point of liquid metal supply in the mold to a point of discharge of said slab.
Claim 6
Dependent Claim
30 words
The method according to claim 4 wherein said slab is straightened by rolling pressure applied between the upper and lower edges thereof as it is continuously to said discharge position.
Claim 7
Dependent Claim
96 words
The method according to claim 1 wherein said molten metal is so cast into said continuous slab as to impart to said solidified shell first formed thereof, a plurality of concavely arched sidewalls from a mold correspondingly formed transversely of said shell on each of its said oppositely disposed sidewalls, and wherein said shell is subjected to restraining pressure applied vertically at the junctions between said arched sidewalls on each face of said shell in addition to said pressure applied between the opposite edges of said shell in order to maintain said previously formed arched sidewalls.
Claim 8
Independent Claim
45 words
The method according to 1 wherein the distance transversely of the slab between which edge rolling pressure is applied is increased, to permit the ferrostatic pressure of said molten core to widen said slab and reduce the degree of concavity of the arched sidewalls thereof.
Claim 9
Independent Claim
45 words
The method according to 1 wherein the distance transversely of the slab between which edge rolling pressure is applied is increased, to permit the ferrostatic pressure of said molten core to widen said slab and reduce the degree of concavity of the arched sidewalls thereof.
Claim 10
Independent Claim
22 words
The method according to 7 wherein slabs of different widths can be so produced from a cast slab of constant initial width.
Claim 11
Independent Claim
22 words
The method according to 7 wherein slabs of different widths can be so produced from a cast slab of constant initial width.
Claim 12
Independent Claim
58 words
The method according to 7 in which the distance between the concave surfaces of said arched sidewalls at their median points is thus increased thereby permitting liquid metal to flow into the gap created by such increased distance, and thus avoiding pipes or bridging and other defects in the center of the slab caused by intensely concentrated cooling.
Claim 13
Independent Claim
58 words
The method according to 7 in which the distance between the concave surfaces of said arched sidewalls at their median points is thus increased thereby permitting liquid metal to flow into the gap created by such increased distance, and thus avoiding pipes or bridging and other defects in the center of the slab caused by intensely concentrated cooling.
Claim 14
Dependent Claim
45 words
The method according to claim 4, wherein said metal is cast at temperature of about 2,800* to 2,900* F. and the cast slab cooled at a rate such that at said point given location of tangency the slab temperature is about 2,000* to 2,200* F.
Claim 15
Independent Claim
120 words
A method of continuously casting a slab comprising the steps of pouring molten metal into a cooled tubular mold and continuously withdrawing an elongated slab from beneath said mold, said slab comprising an outer shell surrounding an internal molten core, shaping said outer shell to provide a pair of oppositely disposed relatively wide sidewalls inwardly arched toward each other and interconnected at their edges by a pair of oppositely disposed relatively narrow end walls, guiding said slab away from said mold by contacting said slab solely at said end walls and subjecting said slab to buttressing forces directed along the width sidewalls to maintain their arched configuration while leaving the arched surfaces of said sidewalls substantially free of mechanical engagement.
Claim 16
Independent Claim
120 words
A method of continuously casting a slab comprising the steps of pouring molten metal into a cooled tubular mold and continuously withdrawing an elongated slab from beneath said mold, said slab comprising an outer shell surrounding an internal molten core, shaping said outer shell to provide a pair of oppositely disposed relatively wide sidewalls inwardly arched toward each other and interconnected at their edges by a pair of oppositely disposed relatively narrow end walls, guiding said slab away from said mold by contacting said slab solely at said end walls and subjecting said slab to buttressing forces directed along the width sidewalls to maintain their arched configuration while leaving the arched surfaces of said sidewalls substantially free of mechanical engagement.
Claim 17
Dependent Claim
20 words
The method according to claim 1 wherein said arched sidewalls are formed during casting of the molten metal with chilling.
Claim 18
Dependent Claim
27 words
The method according to claim 1 wherein the arched sidewalls of said slab as continuously cast are subjected to coolant sprays for progressively solidifying said slab throughout.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |