CN102020476B - Method for molding cast lughole of dozzle of large steel ingot - Google Patents
Method for molding cast lughole of dozzle of large steel ingot Download PDFInfo
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- CN102020476B CN102020476B CN201010533932A CN201010533932A CN102020476B CN 102020476 B CN102020476 B CN 102020476B CN 201010533932 A CN201010533932 A CN 201010533932A CN 201010533932 A CN201010533932 A CN 201010533932A CN 102020476 B CN102020476 B CN 102020476B
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- steel ingot
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- lughole
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Abstract
The invention discloses a method for molding a dozzle and a cast lughole of a large steel ingot and a novel refractory material used by the same. The molding characteristics of the cast lughole can be increased. The method for molding the dozzle and the cast lughole of the large steel ingot comprises the following steps of: (1) building the cast lughole in a dozzle shell by using the novel refractory material, wherein the novel refractory material comprises the following components in percentage by mass: not less than 65% and not more than 75% of Al2O3 and not more than 1.0% of Fe2O3, the volume density is 0.65-0.8 g/cm3, the cold compressive strength is 3-8 MPa, the refractoriness is greater than 1600 DEG C, and the coefficient of heat conductivity (at 1100 DEG C) is not less than 0.35 W/m.k; and (2) drying the built and molded cast lughole for later use. The novel refractory material can resist the high temperature action of liquid steel at high temperature, has relatively low strength, can be crushed by solidified steel ingot lugs, and can ensure that the cast lug and the dozzle shell of the steel ingot do not produce cracks.
Description
Technical field
The present invention relates to the product of a kind of refractory materials and preparation thereof, be specifically related to a kind of formative method of large-scale steel ingot cap mouth casting earhole and the novel refractory of employing thereof.
Background technology
In the production of heavy casting and forging; The weight of large-scale steel ingot is usually all between 200 ~ 600t; Owing to receive the restriction of weight handling equipment ability; In order to lift by crane the needs of steel ingot, often need in the hot topping housing, directly to cast out hanger during the cast steel ingot cutting out hanger on the hot topping housing of steel ingot or in steel ingot hot topping housing, reserving the casting earhole.Great majority are the methods that adopt the casting hanger at present.
The moulding of the earhole of large-scale steel ingot cap mouth casting at present; It mainly is the method moulding of adopting the foundry sand knotting; Because in use there is following problem in foundry sand intensity and refractoriness is lower and limit by the characteristics of large-scale steel ingot pouring technology: 1. in the moulding of casting earhole or the preceding ingot mold set-up procedure of cast, owing to overturning, transport steel ingot hot topping housing etc.; Cause collapsing of molding sand easily, casting earhole difficult forming.For the large-scale steel ingot more than the 300t, because size is big, the moulding of casting earhole is more difficult, and production efficiency is low; 2. in the casting process of steel ingot, because the duration of pouring of steel ingot is long, annotate the low characteristics of speed, the molding sand on the casting earhole is come off by molten steel scouring easily, gets in the steel ingot and forms inclusion, influences the quality of steel ingot; Collapsing of molding sand can occur when serious, cause the casting ear to be shaped; 3. need spread the thick steel plate of one deck 10mm on the surface of molding sand, coming off easily at the steel pouring process light plate gets in the steel ingot, forms inclusion metallic; The refractoriness of 4. casting the earhole molding sand is low, and the scab of casting ear is serious, the cleaning difficulty of hanger, and clearance time reaches more than 10 hour sometimes, and production efficiency is low; 5. if adopt common refractory brick to build the casting earhole by laying bricks or stones; Because the intensity of common refractory brick is big, refractory materials does not have deformability in the solidifying of steel ingot, can not be defeated and dispersed automatically; Can cause the suspension of cast steel ingot; Make steel ingot hot topping housing produce transverse fissure and casting basal part of the ear portion crackle, influence the quality of steel ingot and cause the potential safety hazard in steel ingot lifting, the transportation, build the method for casting earhole with common refractory brick by laying bricks or stones and in the production of large-scale steel ingot, do not use.
Adopt foundry sand knotting cap mouth casting earhole technology, two casting earholes of a hot topping of knotting need two day time, when hot topping is installed, the phenomenon that molding sand collapses often occurs, and the casting earhole of knotting 450t ingot head opening is more difficult.After steel ingot was raised one's hat, the scab of casting ear was serious, and clearance time generally needs 7 ~ 8 hours, also often occurred causing the casting ear to hang because molding sand comes off, and needed the situation with oxygen machining shaping hanger.
Summary of the invention
Technical problem to be solved by this invention provides a kind of large-scale steel ingot cap mouth that improves casting earhole shaping characteristic and casts the formative method of earhole and the novel refractory of employing thereof.
The technical solution adopted for the present invention to solve the technical problems is: the formative method of large-scale steel ingot cap mouth casting earhole comprises:
A, employing novel refractory are built the casting earhole by laying bricks or stones in the hot topping housing, this novel refractory is: Al
2O
3Mass percent be: 65%≤Al 2O3≤75%, Fe
2O
3Mass percent be: Fe
2O
3≤1.0%, volume density 0.65 ~ 0.8g/cm
3, cold crushing strength 3 ~ 8MPa, refractoriness＞1600 ℃, thermal conductivity (1100 ℃)≤0.35W/m.k;
B, make the casting earhole dried for standby of building by laying bricks or stones after the moulding.
As preferred version, in step b, adopt little fire will cast earhole and dry for use.
Novel refractory, Al
2O
3Mass percent be: 65%≤Al
2O
3≤75%, Fe
2O
3Mass percent be: Fe
2O
3≤1.0%, volume density 0.65 ~ 0.8g/cm
3, cold crushing strength 3 ~ 8MPa, refractoriness＞1600 ℃, thermal conductivity (1100 ℃)≤0.35W/m.k.
The invention has the beneficial effects as follows: the novel refractory that the present invention adopts; Make material under hot conditions; Can resist the high temperature action of molten steel, material at a lower temperature, intensity is relatively low; Steel ingot hanger crushing after being solidified can guarantee that the casting ear of steel ingot and hot topping housing do not crack.After adopting formative method of the present invention, build two casting earholes of a hot topping by laying bricks or stones, only need time half a day; The phenomenon that the casting earhole collapses does not appear in the hot topping process is installed; The clearance time of casting ear only needed about 2 hours after steel ingot was raised one's hat, and had greatly improved labour productivity, had alleviated working strength of workers; Solve molding sand simultaneously and got into the problem that steel ingot forms inclusion, had important effect to improving the quality of products.
Description of drawings
Fig. 1 is for building the structural representation of novel refractory by laying bricks or stones in the hot topping housing;
Fig. 2 be among Fig. 1 A to structural representation.
Be labeled as among the figure: hot topping housing 1, novel refractory 2, casting earhole 3.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Like Fig. 1 and shown in Figure 2, the formative method of large-scale steel ingot cap mouth casting earhole of the present invention comprises the steps:
A, employing novel refractory are built the casting earhole by laying bricks or stones in the hot topping housing, this novel refractory is: Al
2O
3Mass percent be: 65%≤Al
2O
3≤75%, Fe
2O
3Mass percent be: Fe
2O
3≤1.0%, volume density 0.65 ~ 0.8g/cm
3, cold crushing strength 3 ~ 8MPa, refractoriness＞1600 ℃, thermal conductivity (1100 ℃)≤0.35W/m.k; B, make the casting earhole dried for standby of building by laying bricks or stones after the moulding.
This material belongs to aluminosillicate refractory, Al in the material
2O
3Effect, be to make material have higher refractoriness and hot strength, be enough to bear the etch of long period high-temperature molten steel and in use do not peel off, do not ftracture, do not melt; But Al
2O
3Content is unsuitable too high or too low, Al
2O
3Too high, bursting or peeling phenomenon may appear in material in steel pouring process; Al
2O
3Cross lowly, the refractoriness of material can not reach requirement.Fe
2O
3Be to be present in the material as impurity element, it is present in the material, can reduce the fusing point of material greatly, therefore should its quality percentage composition be controlled at Fe
2O
3≤1.0%.
And in the process of building the casting earhole by laying bricks or stones, the hot topping housing of preferably building needs by laying bricks or stones the casting earhole is placed on the ingot mold circle or on the smooth base plate, and the situation that contacts of inspection hot topping housing lower edge flange and base plate will be guaranteed to contact tight.To clean out the residual brick that is reserved in the hot topping housing in the casting earhole cavity, pug etc. simultaneously.
Like Fig. 1 and shown in Figure 2, can carry out from lower to upper when building the casting earhole by laying bricks or stones, the brickwork joint width is preferably smaller or equal to 2mm, and pug is full, and the brick face is smooth.The pug that brickwork joint is extruded will in time be wiped off, guarantees the workplace cleaning.
Key point of the present invention is the best collocation that will guarantee the material physical and chemical index; Make material under hot conditions; Can resist the high temperature action of molten steel, material at a lower temperature, intensity is relatively low; Steel ingot hanger crushing after being solidified can guarantee that the casting ear of steel ingot and hot topping housing do not crack.After adopting formative method of the present invention, build two casting earholes of a hot topping by laying bricks or stones, only need time half a day; The phenomenon that the casting earhole collapses does not appear in the hot topping process is installed; The clearance time of casting ear only needed about 2 hours after steel ingot was raised one's hat, and had greatly improved labour productivity, had alleviated working strength of workers; Solve molding sand simultaneously and got into the problem that steel ingot forms inclusion, had important effect to improving the quality of products.
In addition, in step b, can adopt all means such as seasoning to make the casting earhole dry,, in step b, adopt little fire will cast earhole and dry for use as optimal way.
Use Al
2O
3Content 68%, Fe2O3 content 0.3%, volume density 0.80g/cm3; The material of cold crushing strength 8MPa is built the casting earhole by laying bricks or stones, cast 450t large-scale steel ingot, and naturally cooling is 70 hours behind the ingot steel casting; Ear is cast in the cleaning of raising one's hat, and the casting ear is cleared up easily, the phenomenon of sticking brick; The casting slap on the face is clean, around the inspection casting ear, does not find crackle.Lift by crane, transport steel ingot smoothly.
Use Al
2O
3Content 65%, Fe2O3 content 0.20%, volume density 0.70g/cm3; The material of cold crushing strength 6MPa is built the casting earhole by laying bricks or stones, cast 550t large-scale steel ingot, and naturally cooling is 80 hours behind the ingot steel casting; Ear is cast in the cleaning of raising one's hat, and the casting ear is cleared up easily, the phenomenon of sticking brick; The casting slap on the face is clean, around the inspection casting ear, does not find crackle.Lift by crane, transport steel ingot smoothly.
Use Al
2O
3Content 70%, Fe2O3 content<1%, volume density 0.68gcm3, the material of cold crushing strength 5MPa is built the casting earhole by laying bricks or stones, cast 550t large-scale steel ingot; Naturally cooling is 80 hours behind the ingot steel casting, the cleaning casting ear of raising one's hat, and the casting ear is cleared up easily, not the phenomenon of sticking brick; The casting slap on the face is clean, around the inspection casting ear, does not find crackle.Lift by crane, transport steel ingot smoothly.
Embodiment 4
Use Al
2O
3Content 75%, Fe2O3 content<1%, volume density 0.65gcm3, the material of cold crushing strength 3MPa is built the casting earhole by laying bricks or stones, cast 450t large-scale steel ingot; Naturally cooling is 70 hours behind the ingot steel casting, the cleaning casting ear of raising one's hat, and the casting ear is cleared up easily, not the phenomenon of sticking brick; The casting slap on the face is clean, around the inspection casting ear, does not find crackle.Lift by crane, transport steel ingot smoothly.
Claims (2)
1. large-scale steel ingot cap mouth is cast the formative method of earhole, it is characterized in that:
A, employing refractory materials are built the casting earhole by laying bricks or stones in the hot topping housing, this refractory materials is: Al
2O
3Mass percent be: 65%≤Al
2O
3≤75%, Fe
2O
3Mass percent be: Fe
2O
3≤1.0%, volume density 0.65 ~ 0.8g/cm
3, cold crushing strength 3 ~ 8MPa, refractoriness＞1600 ℃, the thermal conductivity≤0.35W/m.k in the time of 1100 ℃;
B, make the casting earhole dried for standby of building by laying bricks or stones after the moulding.
2. the formative method of large-scale steel ingot cap mouth casting earhole as claimed in claim 1 is characterized in that: in step b, adopt little fire will cast earhole and dry for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010533932A CN102020476B (en) | 2010-11-05 | 2010-11-05 | Method for molding cast lughole of dozzle of large steel ingot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010533932A CN102020476B (en) | 2010-11-05 | 2010-11-05 | Method for molding cast lughole of dozzle of large steel ingot |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102020476A CN102020476A (en) | 2011-04-20 |
| CN102020476B true CN102020476B (en) | 2012-10-10 |
Family
ID=43862301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010533932A Active CN102020476B (en) | 2010-11-05 | 2010-11-05 | Method for molding cast lughole of dozzle of large steel ingot |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102020476B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4250946A (en) * | 1979-07-12 | 1981-02-17 | United States Steel Corporation | Method for producing ingot mold stools |
| CN1039984A (en) * | 1988-08-03 | 1990-02-28 | 鞍山钢铁公司 | Totally casting compound lift-liquid pipe and manufacturing method thereof |
| CN101265118A (en) * | 2008-04-26 | 2008-09-17 | 孝义市京山耐火材料有限公司 | Micro-pore mullite lightweight aggregate and preparation method thereof |
-
2010
- 2010-11-05 CN CN201010533932A patent/CN102020476B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4250946A (en) * | 1979-07-12 | 1981-02-17 | United States Steel Corporation | Method for producing ingot mold stools |
| CN1039984A (en) * | 1988-08-03 | 1990-02-28 | 鞍山钢铁公司 | Totally casting compound lift-liquid pipe and manufacturing method thereof |
| CN101265118A (en) * | 2008-04-26 | 2008-09-17 | 孝义市京山耐火材料有限公司 | Micro-pore mullite lightweight aggregate and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN102020476A (en) | 2011-04-20 |
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Effective date of registration: 20180315 Address after: 618013 Deyang Pearl River West Road, Sichuan, No. 460 Patentee after: Double (Deyang) heavy equipment Co., Ltd. Address before: 618013 Deyang Pearl River West Road, Sichuan, No. 460 Patentee before: Erzhong Group (Deyang) Heavy Equipment Co., Ltd. |
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