CN100506433C - Carbon-free casting powder for casting steel making die - Google Patents
Carbon-free casting powder for casting steel making die Download PDFInfo
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- CN100506433C CN100506433C CNB2006100295605A CN200610029560A CN100506433C CN 100506433 C CN100506433 C CN 100506433C CN B2006100295605 A CNB2006100295605 A CN B2006100295605A CN 200610029560 A CN200610029560 A CN 200610029560A CN 100506433 C CN100506433 C CN 100506433C
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Abstract
The invention provides a carbon-free protective slag for steel-making mould casting, the percentage by weight compositions of components in the invention are as follows: 50 to 70 percent of e basic slag charge containing CaO, SiO2 and little Al2O3, 5 to 20 percent of hollow microsphere containing SiO2 and Al2O3, 10 to 25 percent of expanded perlite containing SiO2 and Al2O3, 5 to 15 percent of calcined soda for industrial purpose. The protective slag of the invention has fewer kinds of raw materials, good melting performance, good spreadability, low volume weight, good heat-insulating property, and can effectively avoid adding carbon to ingot steel.
Description
Technical field
The ingot casting that the present invention relates to make steel is used the auxiliary material field, particularly a kind of carbon-free casting powder for casting steel making die.
Background technology
In steel-making ingot casting process; when making a bet killed steel; usually in the ingot mould bottom; or near the ingot mould bottom, place or hang covering slag; when molten steel enters ingot mould bottom and contacts with covering slag by the soup road; covering slag just floats on the molten steel face; because the fusing point of covering slag is far below liquid steel temperature; therefore on the molten steel face, formed liquid slag layer; molten steel constantly enters ingot mould; the molten steel face continues to rise, and covering slag continues fusing, has formed one deck covering slag film like this between steel ingot scull and steel ingot die wall; finish until ingot steel casting, whole surface of steel ingot is all wrapped up by one deck slag film.
The steel-making ingot casting has following effect with covering slag (being called for short the die casting covering slag): the molten slag layer secluding air prevents secondary oxidation of steel; The field trash that floats in the slag absorption molten steel; Slag film between die wall and steel ingot impels surface of steel ingot bright and clean; Granulated slag also plays insulation effect to molten steel.
Covering slag is made up of three parts usually, promptly contains CaO, SiO
2, Al
2O
3Basic slag charge Deng oxide; Regulate covering slag fusing point, viscosity, contain Na
2The flux of composition such as O, F; Regulate the carbon material of covering slag burn-off rate.
Carbon material in the covering slag is graphite, carbon black, coke powder etc., and addition is 10%～30%, and it prevents outside the covering slag sintering except regulating burn-off rate, can also improve the spreadability of covering slag, strengthens insulation effect.But the carbon material in the covering slag usually causes the local carburetting of steel ingot.Rong covering slag does not directly contact with molten steel in the ingot mould bottom; carbon dissolution in the covering slag causes carburetting in molten steel; molten steel rises to the ingot body and cap mouth intersection granulated slag is assembled and is detained at this; granulated slag contacts with red heat ingot body with molten steel and causes carburetting, the center carburetting that causes at the mass transfer of the cap portion of molten steel final set zone carbon.So the local carburetting defective of the steel ingot that covering slag causes for die casting mild steel is unavoidable often.Less than 1% steel grade, must use the privacy protection slag for those phosphorus content.
Reduce and even not add the effective way that carbon material prevents steel ingot carburetting beyond doubt, it is that the nitride of representative is to substitute carbon material that patent US4038067 has proposed to adopt BN.The nitride fusing point is higher, and its lattice is similar to graphite, can be used as the framework material in the covering slag, but cost an arm and a leg, and the spreadability of covering slag and heat insulating ability is not as the carbon-containing protective slag.The carbon-less protecting slag that patent CN92106323.7 adopts natural wollastonite, lime stone, potassic feldspar, fluorite, calcined soda for industry, vermiculite to form; this invention prevents that the effect of strand carburetting is obvious, but fusing point viscosity is low, and consumption is big; easy-sintering, heat insulating ability and spreadability are not good.
Summary of the invention
The purpose of this invention is to provide a kind of carbon-free casting powder for casting steel making die, raw material types is oversimplified, hang down unit weight and meltdown property, spreadability and heat-insulating property are improved, and can effectively avoid steel ingot carburetting.
For achieving the above object, the invention provides a kind of carbon-free casting powder for casting steel making die, its weight percentages of components is: contain CaO, SiO
2And a small amount of Al
2O
3Wollastonite be basic slag charge, addition is 50～70; Contain SiO
2, Al
2O
3The pearl of wafing, addition is 5～20; Contain SiO
2, Al
2O
3Expanded perlite, addition is 10～25; Industrial soda ash, addition are 5～15.
Preferably, the pearl of wafing is that the method for water flotation in power plant's flue dust is separated from coal ash, is a kind of hollow ball-shape thing of sealing; Expanded perlite is a kind of ultralight matter construction material, is obtained through expansion process by natural minerals, and its unit weight is 0.01 gram per centimeter
3
Preferable, the granularity of wollastonite, expanded perlite and industrial soda ash is controlled to be: be less than 1% greater than 0.25 millimeter, be no less than 50% less than 0.044 millimeter; Waft bead footpath 100% less than 0.36 millimeter.
Below be the effect and the qualification explanation thereof of key component of the present invention:
Wollastonite, addition are 50～70 (wt%)
Contain CaO, SiO
2And a small amount of Al
2O
3Wollastonite be basic slag charge because CaO, SiO
2, Al
2O
3Be the main oxides of forming the covering slag composition, and wollastonite is a kind of natural minerals, it is its main component with above-mentioned three kinds of oxides exactly, is one of good raw material of covering slag, is the main material in the covering slag of the present invention.If the wollastonite addition is greater than 70%, then the material adding of other fluxs and control unit weight, control flowability is very few, causes the combination property of covering slag not good.If addition is less than 50%, then other auxiliary agents add too much, and then cost rises, and the covering slag performance also is not suitable for, and might cause fusing point, viscosity is on the low side etc.
The pearl of wafing, addition is 5～20 (wt%)
The pearl of wafing is that the method for water flotation in power plant's flue dust (wet ash) is separated from coal ash; it is a kind of hollow ball-shape thing of sealing; can buy the commodity of the commodity pearl of wafing by name from power plant (for example Xuzhou power plant); the pearl of wafing is also referred to as the thin-walled hollow ceramic fine bead; usually with in the what building material industry heat-insulating material; there are not carbon materialses such as graphite in the carbon-less protecting slag; the flowability and the heat insulating ability of covering slag are poor; can improve its heat insulating ability and flowability after adding the pearl of wafing, float the spreadability that pearl explosion at high temperature can also strengthen covering slag.The composition that floats pearl is with SiO
2, Al
2O
3Be main, finally become the part of slag.The pearl addition of wafing is less than 5%, then can not play the raising heat-insulating property, improves the requirement of spreadability, and is too high then uneconomical.
Expanded perlite, addition are 10～25 (wt%)
Add the expanded perlite purpose for reducing the unit weight of covering slag, improve the heat-insulating property of covering slag, reduce the unit weight of covering slag.Expanded perlite is a kind of use ultralight matter construction material widely, is obtained through expansion process by natural minerals, and its unit weight only is 0.01 gram per centimeter
3, contain SiO
2, Al
2O
3Expanded perlite add constantly fusing in the molten steel as covering slag, finally become the part of slag.The fusing point of expanded perlite itself is very low, too much can reduce the fusing point of covering slag as addition, makes the covering slag fusing too fast, and molten solid-state covering slag on the molten steel face can influence the heat-insulating property of covering slag so on the contrary.
Industrial soda ash (Na
2CO
3), addition is 5～15% (wt%)
Industrial soda ash is used to regulate the fusing point and the viscosity of covering slag, with Na
2The form of O becomes the part of slag.Make the fusing point of covering slag, viscosity too high less than above-mentioned scope, then make fusing point, viscosity low excessively greater than above-mentioned scope.
The granularity of above-mentioned raw materials (floating except the pearl) is controlled at: particle diameter is greater than 1% (promptly 60 order oversizes are less than 1%) that be less than of 0.25 millimeter, and particle diameter is less than 50% (promptly 300 order screenings are no less than 50%) that be no less than of 0.044 millimeter.Waft bead footpath 100% less than 0.36 millimeter.Moisture after the raw material stoving is less than 0.5%.To be packaged into bag behind the abundant mixing of above-mentioned raw materials.Certain particle can guarantee raw material blending, and fusing back slag composition is even.Moisture after the raw material stoving is less than 0.5%, prevents that covering slag from luming because of moist, thus the spreadability when influence the covering slag use.
Compared with prior art; the invention has the advantages that: the present invention has added the hollow ball-shape thing of a kind of pearl of wafing by name; the water flotation from power plant's cigarette ash of this material obtains; it is light to have unit weight; good fluidity, explosion at high temperature promotes the characteristics that covering slag flows, and has also allocated expanded perlite into; make covering slag unit weight less than 1/2nd of common covering slag, improved heat-insulating property.It is simple that covering slag of the present invention has raw material types, and meltdown property is good, and spreadability is good, low unit weight, the characteristics of good heat insulating.Less than 1% die casting electrical sheet, the cold pier steel of die casting has all been obtained good use actual achievement on the die casting welding wire steel in phosphorus content.
The specific embodiment
Below be specifying of the embodiment of the invention 1-4.
Die casting carbon-less protecting slag of the present invention at first uses on less than 1% electrical sheet at carbon containing; on cold pier steel, welding wire steel, apply then; the billet surface quality is good, the carburetting that the unprotect slag causes, and the carbon covering slag that has of contrast all more or less has the local carburetting phenomenon of steel billet.
Other raw-material main components see Table 1 in the raw material of carbon-free casting powder for casting steel making die of the present invention and the prior art;
Covering slag of the present invention is made up of the pearl of wafing, expanded perlite, three kinds of mineral materials of wollastonite and industrial chemicals soda ash, becomes slag after the final fusing of these raw materials, and slag composition depends on the composition of these raw materials.And slag composition has determined the setting temperature (must far below liquid steel temperature) of slag and the viscosity of slag; these two performances determined solid protective slag can on the molten steel face, melt gradually ， And and slag flow into play a part lubricated between die wall and the steel ingot scull and the absorption molten steel in field trash.So composition of raw materials of the present invention is except considering the heat insulating ability of solid protective slag, the mobile outer performance that also will consider the slag that covering slag fusing back forms.Wollastonite of the present invention is meant the mineral with typical wollastonite composition (can not use mine tailing) through ore dressing, and the composition of the expanded perlite and the pearl of wafing is more stable.
Table 2 is embodiment of the invention covering slag prescription, covering slag chemical composition and physical property and results of use of example compared with the prior art;
Can see; the embodiment of the invention alleviates unit weight, improves spreadability to remedy the deficiency that does not have carbon material by waft pearl, expanded perlite of adding; the chemical composition of embodiment and comparative example, physical property are all in the normal range (NR) of die casting covering slag; the phosphorus content of comparative example also is the phosphorus content of typical die casting covering slag; but from result of use, carbon-less protecting slag does not cause strand carburetting.Embodiment granularity in the table 2 is a measured result.
Table 1 unit: wt%
Table 2
The prescription of each embodiment of covering slag of the present invention as can be seen from Table 2, physical property and result of use:
Embodiment 1
The carbon-free casting powder for casting steel making die prescription is: contain CaO, SiO
2And a small amount of Al
2O
3Wollastonite be basic slag charge, addition is 57wt%; Contain SiO
2, Al
2O
3The pearl of wafing, addition is 20wt%; Contain SiO
2, Al
2O
3Expanded perlite, addition is 15wt%; Industrial soda ash, addition are 8wt%.
The granularity of above-mentioned wollastonite, expanded perlite and industrial soda ash is controlled to be: be less than 0.9% greater than 0.25 millimeter, be no less than 57% less than 0.044 millimeter; Waft bead degree 100% less than 0.36mm.
In this embodiment, the physical property of covering slag is: fusion temperature is 1312 ℃; Viscosity (1400 ℃ of Pa.s) is 1.7; Unit weight is 0.39g/cm
3
The covering slag result of use is: meltdown property is good, no carburetting, billet surface Functionality, quality and appealing design.
Embodiment 2
The carbon-free casting powder for casting steel making die prescription is: contain CaO, SiO
2And a small amount of Al
2O
3Wollastonite be basic slag charge, addition is 50wt%; Contain SiO
2, Al
2O
3The pearl of wafing, addition is 15wt%; Contain SiO
2, Al
2O
3Expanded perlite, addition is 25wt%; Industrial soda ash, addition are 10wt%.
The granularity of above-mentioned wollastonite, expanded perlite and industrial soda ash is controlled to be: be less than 0.8% greater than 0.25 millimeter, be no less than 56% less than 0.044 millimeter; Waft bead degree 100% less than 0.35mm.
In this embodiment, the physical property of covering slag is: fusion temperature is 1310 ℃; Viscosity (1400 ℃ of Pa.s) is 1.6; Unit weight is 0.31g/cm
3
The covering slag result of use is: meltdown property is good, no carburetting, billet surface Functionality, quality and appealing design.
Embodiment 3
The carbon-free casting powder for casting steel making die prescription is: contain CaO, SiO
2And a small amount of Al
2O
3Wollastonite be basic slag charge, addition is 68wt%; Contain SiO
2, Al
2O
3The pearl of wafing, addition is 9wt%; Contain SiO
2, Al
2O
3Expanded perlite, addition is 18wt%; Industrial soda ash, addition are 5wt%.
The granularity of above-mentioned wollastonite, expanded perlite and industrial soda ash is controlled to be: be less than 0.85% greater than 0.25 millimeter, be no less than 62% less than 0.044 millimeter; Waft bead degree 100% less than 0.34mm.
In this embodiment, the physical property of covering slag is: fusion temperature is 1340 ℃; Viscosity (1400 ℃ of Pa.s) is 1.3; Unit weight is 0.37g/cm
3
The covering slag result of use is: meltdown property is good, no carburetting, billet surface Functionality, quality and appealing design.
Embodiment 4
The carbon-free casting powder for casting steel making die prescription is: contain CaO, SiO
2And a small amount of Al
2O
3Wollastonite be basic slag charge, addition is 70wt%; Contain SiO
2, Al
2O
3The pearl of wafing, addition is 9wt%; Contain SiO
2, Al
2O
3Expanded perlite, addition is 18wt%; Industrial soda ash, addition are 15wt%.
The granularity of above-mentioned wollastonite, expanded perlite and industrial soda ash is controlled to be: be less than 0.75% greater than 0.25 millimeter, be no less than 69% less than 0.044 millimeter; Waft bead degree 100% less than 0.30mm.
In this embodiment, the physical property of covering slag is: fusion temperature is 1315 ℃; Viscosity (1400 ℃ of Pa.s) is 1.1; Unit weight is 0.43g/cm
3
The covering slag result of use is: meltdown property is good, no carburetting, billet surface Functionality, quality and appealing design.
Claims (5)
1. a carbon-free casting powder for casting steel making die is characterized in that, its weight percentages of components is:
Contain CaO, SiO
2And a small amount of Al
2O
3Wollastonite be basic slag charge, addition is 50～70;
Contain SiO
2, Al
2O
3The pearl of wafing, addition is 5～20;
Contain SiO
2, Al
2O
3Expanded perlite, addition is 10～25;
Industrial soda ash, addition are 5～15.
2. carbon-free casting powder for casting steel making die according to claim 1 is characterized in that, the method that the described pearl of wafing is water flotation in power plant's flue dust is separated from coal ash, is a kind of hollow ball-shape thing of sealing.
3. carbon-free casting powder for casting steel making die according to claim 1 is characterized in that, described expanded perlite is a kind of ultralight matter construction material, is obtained through expansion process by natural minerals, and its unit weight is 0.01 gram per centimeter
3
4. carbon-free casting powder for casting steel making die according to claim 1 is characterized in that, the granularity of described wollastonite, expanded perlite and industrial soda ash is controlled to be: greater than 0.25 millimeter be less than 1%, less than 0.044 millimeter be no less than 50%.
5. carbon-free casting powder for casting steel making die according to claim 1 and 2 is characterized in that, the described bead degree 100% that wafts is less than 0.36 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100295605A CN100506433C (en) | 2006-07-31 | 2006-07-31 | Carbon-free casting powder for casting steel making die |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100295605A CN100506433C (en) | 2006-07-31 | 2006-07-31 | Carbon-free casting powder for casting steel making die |
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| Publication Number | Publication Date |
|---|---|
| CN101116906A CN101116906A (en) | 2008-02-06 |
| CN100506433C true CN100506433C (en) | 2009-07-01 |
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|---|---|---|---|
| CNB2006100295605A Expired - Fee Related CN100506433C (en) | 2006-07-31 | 2006-07-31 | Carbon-free casting powder for casting steel making die |
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| CN103567422A (en) * | 2012-07-26 | 2014-02-12 | 宝山钢铁股份有限公司 | Casting powder for producing steel ingots by utilizing mould injection process |
| CN102814490A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Method for preparing casting powder for steelmaking die-casting by using calcareous shale |
| CN102814473A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Preparation method of low-viscosity casting powder for preparing steelmaking cast ingots |
| CN102814489A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Method for preparing casting powder for steelmaking die-casting by using bentonite |
| CN102814472A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Casting powder for casting round ingots and manufacture method of casting powder |
| CN102814474B (en) * | 2012-07-31 | 2016-07-20 | 马鞍山科润冶金材料有限公司 | A kind of covering slag utilizing the steel-making molding of meerschaum system |
| CN102825246A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Covering slag for steelmaking die casting by using fly ash |
| CN102825223B (en) * | 2012-07-31 | 2016-08-03 | 马鞍山科润冶金材料有限公司 | A kind of covering slag utilizing the steel-making molding of attapulgite system |
| CN104646650A (en) * | 2015-02-03 | 2015-05-27 | 舞阳钢铁有限责任公司 | Ultra-low carbon covering slag used for 50t-level large flat ingot die casting |
| CN104889352A (en) * | 2015-05-22 | 2015-09-09 | 长兴明晟冶金炉料有限公司 | High-speed steel mould casting protection slag |
| CN104907542A (en) * | 2015-05-22 | 2015-09-16 | 长兴明晟冶金炉料有限公司 | Casting powder for stainless steel mold casting |
| CN111318676A (en) * | 2018-12-13 | 2020-06-23 | 洪江市三兴冶金炉料有限责任公司 | High-speed steel die casting covering slag and preparation method thereof |
| CN111318677B (en) * | 2018-12-13 | 2021-07-27 | 洪江市三兴冶金炉料有限责任公司 | Stainless steel mold casting covering slag |
| CN113894272A (en) * | 2021-10-08 | 2022-01-07 | 成都先进金属材料产业技术研究院股份有限公司 | Corrosion-resistant alloy die casting protective slag |
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|---|---|---|---|---|
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2006
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|---|---|---|---|---|
| US4038067A (en) * | 1975-06-13 | 1977-07-26 | Nippon Steel Corporation | Carbon-free casting powder for ingot casting and continuous casting |
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