CN1021641C - Synthetic protector for ingot casting - Google Patents
Synthetic protector for ingot casting Download PDFInfo
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- CN1021641C CN1021641C CN 90107646 CN90107646A CN1021641C CN 1021641 C CN1021641 C CN 1021641C CN 90107646 CN90107646 CN 90107646 CN 90107646 A CN90107646 A CN 90107646A CN 1021641 C CN1021641 C CN 1021641C
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Abstract
The present invention relates to a synthetic protective agent for casting steel, which is suitable for lubrication in the demoulding process, heat preservation and heat insulation in the cooling process when steel ingots are cast in steel plants. The synthetic protective agent for casting steel is made from low-carbon graphite powder(or raw ore graphite), fluorite and acidized graphite. The present invention is characterized in that artificial overlapped graphite (or medium-carbon and high-carbon graphite) is used as the heat-preservation and heat-insulation raw material, and silicon-iron powder (or aluminum power) is used as the heating raw material so as to strengthen the frame and enhance the persistent heat insulation performance and the persistent heat preservation performance, so that the synthetic protective agent for casting steel has favorable lubricating property and favorable heat preservation performance; a heat insulation board in the casting technique with two processes is not needed in the casting process; the quality of the riser and the body of the steel ingot is superior to that of the prior art.
Description
The invention belongs to metallurgy and use insulation material, insulation in lubrication sdemoulding and the cooling when being applicable to steel mill teeming is to replace the insulation material of " two one ".
When China casts the clean steel ingot in town at present; formed the protection casting process form of demoulding insulation of " two one " of " Trinity " and heat-insulating shield, the composite slag of heat-insulating shield, covering slag, exothermic mixture; but these two kinds of process forms all be unable to do without heat-insulating shield, have therefore all brought problem from several aspects.From operation, it seems, and operation is loaded down with trivial details, and labor strength is big, and casting also needs during large steel ingot hang the cap muzzle of several tons of weights so that lay heat-insulating shield with equipment, accounts for equipment, consumed power; From the stock, auxiliary material are wide in variety, heat-insulating shield rapid wear particularly, and Yi Chao gives to store and transportation has all brought very big difficulty; From equipment, press down the clean mould rimmed ingot (mould can not how with) of can not casting, can only be respectively to water mold and cast with different, depositing of mould occupies large stretch of area, and mould takies many funds.
The lubricated insulation material of " Trinity " technology is grouped into by following one-tenth:
Heat-insulating shield: lubricant: exothermic mixture:
Straw fibrid low-carbon-content graphite powder aluminium powder
Magnesia fluorite aluminium ash
Resin waterglass wood chip
Sodium nitrate
Acidifying graphite
Iron scale
They in use lubricant must water in the mold prior to the exothermic mixture input, treat could throw in exothermic mixture after molten steel is full of.Generally, the workman inevitably has inhomogeneities in feeding intake, and exothermic mixture mineral assemblage is unreasonable, exothermic mixture throwing spreadability behind molten steel surface is bad, can not sprawl out the uniform heat-insulation layer that can guarantee ingot quality at molten steel surface, causes the ingot head opening inhomogeneous cooling even, head has shrinkage cavity, material is loose, and the cap mouth need cut many when steel rolling, has influenced lumber recovery.
Along with the development of society, " Trinity " adapts to ingot casting protection usefulness far from, begins to seek to reduce the shrinkage cavity of ingot casting head since 85 years universities and colleges and smelter, improves ingot surface quality, with the desirable covering slag of the minimizing cap mouth amount of cutting.The casting process that has selected " two one " is created in logical effort in a few years finally, and covering slag and exothermic mixture are modified into composite slag.The lubricated insulation material composition of " two one " technology is as follows:
Heat-insulating shield: composite slag:
Straw fibrid low-carbon-content graphite powder
The magnesia fluorite
Resin acid fossil China ink
Waterglass
Silica flour
Composite slag waters in the mold prior to the molten steel input in the use, saved once and to have dropped into operation, and molten steel when filling with mold composite slag can form uniform heat-insulation layer at the rapid drawout of molten steel surface, the shrinkage cavity that significantly reduces the cap mouth has improved lumber recovery.But it still will use heat-insulating shield because its later stage to ingot head additional heat this respect deficiency, the insulation persistence is also relatively poor, mineral assemblage of this explanation composite slag still needs further to improve, so that remove the heat-insulating shield that brings many inconvenience and trouble.
The objective of the invention is to overcome the deficiency of insulation material in existing " two one " casting process, a kind of new synthetic protector for ingot casting is provided, remove heat-insulating shield, reduce labor intensity saving fund, place and equipment to simplify the operation.
Synthetic protector for ingot casting provided by the invention selects for use artificial overlapping graphite to make the heat-insulation and heat-preservation base-material and ferrosilicon powder is made heating material, strengthens its skeleton and the lasting performance of adiabatic heat-insulation.Protective agent includes low-carbon-content graphite powder (or raw ore graphite); fluorite, acidifying graphite is characterized in that making the heat-insulation and heat-preservation base-material with artificial overlapping graphite (or middle and high carbon graphite); make heating material with ferrosilicon powder (or aluminium powder), its weight proportion following (sum total is not equal to 100):
Low-carbon-content graphite powder (or raw ore graphite) 20-50
Fluorite 8-20
Acidifying graphite 8-18
Artificial overlapping graphite (or middle and high carbon graphite) 8-20
Ferrosilicon powder (or aluminium powder) 4-10
In protective agent mineral assemblage provided by the present invention, the low-carbon-content graphite powder plays function of heat insulation.It is poor that consumption is lower than the heat insulating ability of prescribing a time limit down, and it is slow to be higher than molten speed in limited time;
The fluorite powder plays fluxing action.Consumption is lower than down fusing point height in limited time, and it is low that consumption is higher than the fusing point of prescribing a time limit;
Acidifying graphite plays the expanded by heating insulation effect.It is poor that consumption is lower than the heat insulating ability of prescribing a time limit down, and consumption is higher than cost height in limited time;
Artificial overlapping graphite plays important function heat insulation and insulation.It is poor that consumption is lower than the heat insulating ability of prescribing a time limit down, and it is too high that consumption is higher than the protective agent cost of prescribing a time limit;
Ferrosilicon powder (or aluminium powder) plays a part to generate heat in the fusion to replenish cap mouth heat.It is not enough that consumption is lower than the additional heat of prescribing a time limit down, the cost costliness of prescribing a time limit on the consumption.
Except making protective agent by above-mentioned prescription, can also make protective agent have higher expansion multiple, activity and lubricity by following prescription manufacturing to substitute " two one ":
Low-carbon-content graphite powder (or raw ore graphite) 30-40
Fluorite 8-12
Acidifying graphite 10-14
Artificial overlapping graphite (or middle and high carbon graphite) 5-15
Ferrosilicon powder (or aluminium powder) 4-10
Portland clinker 20-30
Soda ash (or waterglass, receive feldspar) 6-10
Silica flour 8-12
In this prescription, Portland clinker plays and increases activity, makes protective agent fusing point, molten fast all permanent, the effect that surface of steel ingot is smooth.Consumption is lower than down in limited time, poor lubrication, and surface of steel ingot is rough, and it is soft that consumption is higher than the skeleton of prescribing a time limit, and it is poor to be incubated;
Soda ash (waterglass, the feldspar of receiving) plays a part enhanced activity.Consumption is lower than that down in limited time viscosity is big, and molten speed is slow, and the easy accumulated slag of surface of steel ingot and pockmark occurs, consumption are higher than that viscosity is rare in limited time, and molten speed is fast, and it is big to consume dosage, and it is poor to be incubated;
Silica flour plays a part to adjust acid-base value.Consumption is lower than alkaline down big in limited time, and alkalescence is little in limited time on the consumption height;
Protective agent has formed the mineral characteristics of layering fusing by stages in fusion process, making in its process of setting after molten steel waters completely has enough uniform thermal insulating warm-keeping layers, makes the molten steel of cap mouth be complemented at the ingot body fully, gets at 2.34 tons of steel ingots
Fall the heat-insulating shield not show of back 80 minutes protective agent top of casting, does not solidify in the middle of the steel ingot, from setting time and insulation adiabatic condition, the steel ingot internal structure does not have any problem.After the steel ingot cooling and demolding, head shrinks and shows " dish " shape, and is very smooth smooth, and the recessed slightly shallower in depth of contraction is in the steel ingot of heat-insulating shield, composite slag casting.
Protectant physical and chemical performance is as follows:
Physical property
Fusing point (℃) molten speed (1350 ℃) expansion multiple unit weight g/m
3Angle of rest (repose) (degree) moisture granularity (order)
1070-1190 34″-2′30″ ≥2.8 ≤0.95 ≤45 ≤0.75 -100-90
Heat waste value (J/cm
2.s)
≤15500
Chemical property
SiO
2CaO Al
2O
3Fe
2O
3MgO C F R
2O
36±12 17±9 7±3 3±1 6±2 20±5 ≤8 ≤7
Specific embodiments of the invention are as follows:
Low-carbon-content graphite powder (or raw ore graphite) 20 35 50 30 35 40
Fluorite 8 14 20 8 10 12
Acidifying graphite 8 13 18 10 12 14
Artificial overlapping graphite (or middle and high carbon graphite) 8 14 20 5 10 15
Ferrosilicon powder (or aluminium powder) 47 10 47 10
Portland clinker 20 25 30
Soda ash (or waterglass, the feldspar of receiving) 68 10
Silica flour 8 10 12
Its fusing point height of the protective agent of embodiment one, four, molten speed is slow; Its fusing point of protective agent of embodiment three, six is low, and molten speed is fast, and consumption is big, the cost height; Its fusing point of protective agent of embodiment two, five and molten speed are between embodiment one, four and three, six, and the surface smoothness of ingot casting and the recessed degree of depth of cap mouth are the best, and consumption dosage is little, and cost is also lower, and effect is ideal.
Synthetic protector of the present invention is pressed the preparation of technological process shown in the figure:
Protective agent provided by the invention is without heat-insulating shield; replaced " two one " casting process; the big or small ingot shape that is fit to various conditions, boiling steel; pressing down clean steel can general a kind of ingot mould, and this protective agent spreadability is good; cover evenly active; can on steel ingot, form melt cinder rapidly; three layers of lubricated insulation construction of fusion and bisque, adiabatic heat-insulation is good, and the cap mouth shrinks and shows " dish " shape; it is recessed less than " two one " technology; ingot casting does not have shrinkage cavity, no rarefied zone, low power densification; surface of steel ingot is smooth; reduce the reconditioning expense, improve lumber recovery, save the place; mould; material is convenient to the stock and is used; large-sized casting ingot need not lift the cap muzzle, does not need to adorn heat-insulating shield; asbestos cord, simple to operation; obviously improve labor strength, reduce dust pollution.
Claims (2)
1, a kind of synthetic protector for ingot casting; lubricating release and cooling insulation when being applicable to steel mill teeming; it includes low-carbon-content graphite powder (or raw ore graphite); fluorite; acidifying graphite; it is characterized in that it also has artificial overlapping graphite (or middle and high carbon graphite) and ferrosilicon powder (or aluminium powder), its weight proportion following (sum total is not equal to 100):
Low-carbon-content graphite powder (or raw ore graphite) 20-50
Fluorite 8-20
Acidifying graphite 8-18
Artificial overlapping graphite (or middle and high carbon graphite) 8-20
Ferrosilicon powder (or aluminium powder) 4-10
2, a kind of synthetic protector for ingot casting, lubricating release and cooling insulation when being applicable to steel mill teeming is characterized in that it makes (sum total is not equal to 100) by following weight proportion:
Low-carbon-content graphite powder (or raw ore graphite) 30-40
Fluorite 8-12
Acidifying graphite 10-14
Artificial overlapping graphite (or middle and high carbon graphite) 5-15
Ferrosilicon powder (or aluminium powder) 4-10
Portland clinker 20-30
Soda ash (or waterglass, receive feldspar) 6-10
Silica flour 8-12
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90107646 CN1021641C (en) | 1990-09-10 | 1990-09-10 | Synthetic protector for ingot casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90107646 CN1021641C (en) | 1990-09-10 | 1990-09-10 | Synthetic protector for ingot casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1059680A CN1059680A (en) | 1992-03-25 |
| CN1021641C true CN1021641C (en) | 1993-07-21 |
Family
ID=4880646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90107646 Expired - Fee Related CN1021641C (en) | 1990-09-10 | 1990-09-10 | Synthetic protector for ingot casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1021641C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039522C (en) * | 1994-05-09 | 1998-08-19 | 杨明海 | Compounded painkilling and anti inflammatory cream |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103042182A (en) * | 2012-07-06 | 2013-04-17 | 山国强 | Heat preservation covering agent |
| CN102825224A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Composite heat generating agent for weathering steel |
-
1990
- 1990-09-10 CN CN 90107646 patent/CN1021641C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039522C (en) * | 1994-05-09 | 1998-08-19 | 杨明海 | Compounded painkilling and anti inflammatory cream |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1059680A (en) | 1992-03-25 |
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| C14 | Grant of patent or utility model | ||
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