US2290305A - Ingot mold coating - Google Patents
Ingot mold coating Download PDFInfo
- Publication number
- US2290305A US2290305A US31719040A US2290305A US 2290305 A US2290305 A US 2290305A US 31719040 A US31719040 A US 31719040A US 2290305 A US2290305 A US 2290305A
- Authority
- US
- United States
- Prior art keywords
- mold
- coating
- ingot
- ingot mold
- mold coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
- Y10T428/31717—Next to bituminous or tarry residue
Definitions
- flash repelling includes such materials as tar. graphite. molasses, brine and anhydrous borax.
- Another type of coating may be termed "reducing" in nature and results in a lessening in ingot pits which, in turn, reduces the number of cracks and seams in the finished product. The most.
- a coating of the reducing type is aluminum, although there may be used other materials, such as powdered ferromanganese and powdered silicon applied as a wash with a suitable carrier, such as linseed oil and turpentine.
- Another object is the provision of a mold coat ing which is extremely eflicient in the elimination or material reduction of surface defects in ingots and one which is, at the same time, cheap and easy to manufacture and use.
- the ingot mold is first coated with a splash repelling medium, such as tar, of a composition which is conventional in the art of mold coatings.
- a splash repelling medium such as tar
- a coating of a medium which is reducing in nature such as aluminum paint
- the composition of which is entirely conventional in the art of ingot mold coatings is first coated with a splash repelling medium, such as tar, of a composition which is conventional in the art of mold coatings.
- the aluminum is the active agent for deoxidation and in the case of a "double mold coating with the aluminum as the outside coating, it is more readily available for the deoxidation of the steel which must occur almost instantaneously in order to eliminate blow holes.
- An ingot mold coating comprising an original layer of tar, and a superposed coating of aluminum paint.
Description
Patented July 21, 1942 2.290.305 moor MOLD coa'rmo Loren J. Westhaver, Worcester, Mass., assignor to The American Steel and Wire Company of New Jersey, a corporation of New Jersey No Drawing. Application February 3, 1940, Serial N0. 317,190
1 Claim.
tom of the ladle (as the case may be) and impinges upon the bottom of the mold matrix, which is either formed by the bottom of the mold itself or by a stool or other closure. This inevitably results in splashing of the molten metal against the sides of the mold matrix with the result that the surface of the ingot cast therein is characterized by an uneven condition variously known in the art as"scabs'," splashes, slivers," cracks, "pits, laps, and other descriptive names. This condition results in extremely rapid chilling of the splashed molten metal and adherence thereof to the sides of the mold matrix, whereby surface defects are formed.
Another objectionable feature in the top pouring of ingot molds is caused by an oxidizing condition resulting in an uneven ingot surface identified in the art as blow holes, tears, "seams and "alligator hide."
These surface defects are sometimes removed by chipping, which is a costly operation; but in most cases all of the surface defects cannot be completely removed. It is well understood that any surface defects in the ingot will result in surface defects in the finished product obtained therefrom.
In order to overcome the disadvantages resulting in the splashing of the teemed molten metal against the sides of the mold matrix, and in order to provide a better surface condition in general, numerous coatings have been proposed. One type which may in general be termed "splash repelling includes such materials as tar. graphite. molasses, brine and anhydrous borax. Another type of coating may be termed "reducing" in nature and results in a lessening in ingot pits which, in turn, reduces the number of cracks and seams in the finished product. The most. prevalent material used for a coating of the reducing type is aluminum, although there may be used other materials, such as powdered ferromanganese and powdered silicon applied as a wash with a suitable carrier, such as linseed oil and turpentine. I
It is believed readily apparent that each of the two types of mold costings confers definite benefits which are not inherent in the other. Some workers in the art have endeavored to obtain the joint benefits by combining materials of the two types and using it in the form of a single medium, but my investigations have definitely shown the same to be unsatisfactory.
It is among the objects of the present invention to eliminate or materially reduce surface defects which are carried from the ingot to the finished product obtained therefrom.
Another object is the provision of a mold coat ing which is extremely eflicient in the elimination or material reduction of surface defects in ingots and one which is, at the same time, cheap and easy to manufacture and use.
The invention, then, comprises the features hereinafter fully de'scribed and as particularly pointed out in the claim, the following description setting forth in detail certain illustrative embodiments of the invention, these being indicative of several of the number of ways in which the principles of the invention may be employed.
According to the teachings of the present invention, the ingot mold is first coated with a splash repelling medium, such as tar, of a composition which is conventional in the art of mold coatings. On top of this coating there is applied a coating of a medium which is reducing in nature, such as aluminum paint, the composition of which is entirely conventional in the art of ingot mold coatings.
I have found that the greater the degree of availability of the reducing medium, because of its being in direct contact with the molten steel rather than dispersed throughout a mixture, the more rapid and more efficient deoxidation of the steel at the mold surface with a resultant elimination or material decrease in small surface blow holes. The aluminum is the active agent for deoxidation and in the case of a "double mold coating with the aluminum as the outside coating, it is more readily available for the deoxidation of the steel which must occur almost instantaneously in order to eliminate blow holes.
It will be readily understood by those skilled in the art that the invention contemplates the use of an original coating which is splash repelling in nature whether tar or otherwise; and the application thereto of a coating having a reducing action is not limited to aluminum.
While I have described certain-specific embodiments of the present invention, it will be seen that I do not wish to be limited exactly thereto since various modifications may be made without departing from the scope of the invention, as defined by the following claim.
. I claim:
An ingot mold coating comprising an original layer of tar, and a superposed coating of aluminum paint.
DOREN J WES'I'HAVER.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US31719040 US2290305A (en) | 1940-02-03 | 1940-02-03 | Ingot mold coating |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US31719040 US2290305A (en) | 1940-02-03 | 1940-02-03 | Ingot mold coating |
Publications (1)
Publication Number | Publication Date |
---|---|
US2290305A true US2290305A (en) | 1942-07-21 |
Family
ID=23232529
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US31719040 Expired - Lifetime US2290305A (en) | 1940-02-03 | 1940-02-03 | Ingot mold coating |
Country Status (1)
Country | Link |
---|---|
US (1) | US2290305A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2502473A (en) * | 1946-07-30 | 1950-04-04 | Dacar Chemical Products Compan | Coating composition for molds |
US2749587A (en) * | 1949-02-21 | 1956-06-12 | Walter Macfarlane & Company Lt | Method of producing grey iron castings in preheated refractory coated male and female dies |
US2788207A (en) * | 1952-06-17 | 1957-04-09 | Earl E Riley | Movable bottom cinder pot |
DE1188766B (en) * | 1957-05-28 | 1965-03-11 | Howe Sound Co | Process for lining casting molds for metals of element group IV-B of the periodic table |
-
1940
- 1940-02-03 US US31719040 patent/US2290305A/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2502473A (en) * | 1946-07-30 | 1950-04-04 | Dacar Chemical Products Compan | Coating composition for molds |
US2749587A (en) * | 1949-02-21 | 1956-06-12 | Walter Macfarlane & Company Lt | Method of producing grey iron castings in preheated refractory coated male and female dies |
US2788207A (en) * | 1952-06-17 | 1957-04-09 | Earl E Riley | Movable bottom cinder pot |
DE1188766B (en) * | 1957-05-28 | 1965-03-11 | Howe Sound Co | Process for lining casting molds for metals of element group IV-B of the periodic table |
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