CN103526086A - Magnesium alloy for steelmaking, manufacturing method thereof and steelmaking deoxidation method - Google Patents
Magnesium alloy for steelmaking, manufacturing method thereof and steelmaking deoxidation method Download PDFInfo
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- CN103526086A CN103526086A CN201310545877.4A CN201310545877A CN103526086A CN 103526086 A CN103526086 A CN 103526086A CN 201310545877 A CN201310545877 A CN 201310545877A CN 103526086 A CN103526086 A CN 103526086A
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Abstract
The invention provides magnesium alloy for steelmaking, a manufacturing method of the magnesium alloy and a steelmaking deoxidation method. The manufacturing method comprises the following steps that a magnesium ingot is melted; an aluminum ingot is added to completely-melted magnesium liquid, and the weight ratio of the aluminum ingot to the magnesium liquid is 55-85:15-45; heat preservation melting is carried out at 700-750 DEG C, and stirring and standing are carried out; pouring is carried out at 670-700 DEG C to obtain a magnesium alloy ingot. The steps are carried out in the ambience of protective gas. The magnesium alloy comprises, by weight, 55%-85% of Al, 15%-45% of Mg and a small number of inevitable impurities. The steelmaking deoxidation method comprises the step of carrying out deoxidation treatment on molten steel with the magnesium alloy for the steelmaking. The magnesium alloy for the steelmaking, the manufacturing method of the magnesium alloy and the steelmaking deoxidation method have the advantages that the deoxidation is carried out on the molten steel, meanwhile, strong desulfuration capacity is achieved, most of occluded foreign substances generated after the deoxidation is carried out on the molten steel can be transformed into composite occluded foreign substances, and the quality of the molten steel can be effectively improved.
Description
Technical field
The invention belongs to steelmaking technical field, specifically, relate to magnesium alloy and preparation method thereof for a kind of steel-making, and a kind of deoxidation in steel making method of using this magnesium alloy.
Background technology
Conventionally, in steelmaking process, deoxidation is to utilize deoxidant element to reduce the process of molten steel oxygen level, comprises the floating and the eliminating that there are the deoxidation products producing in the deoxidant element of strong avidity and the deoxygenation of oxygen generation and reaction process with oxygen.The height of oxygen content in steel directly has influence on the quality and performance of final steel.High oxygen level can cause in molten steel condensation process, due to carbon and oxygen segregation dense poly-, will make carbon again be oxidized, make to produce in steel bubble, and have influence on the quality of steel; In addition, oxygen also can be with FeO, Fe
3o
4and other oxide form separates out, be distributed on crystal boundary surface, the plasticity of steel, mechanical property are declined, and produce hot-short, cold shortly, the quality product of special purpose steel is brought to a series of harm.
In modern STEELMAKING PRODUCTION, conventional method of deoxidation mainly contains three kinds: diffusive deoxidation, vacuum deaeration and bulk deoxidation.Because aluminium has that deoxidizing capacity is strong, efficiency is high, inclusion floating speed is fast, residue in steel can crystal grain thinning etc. advantage, so aluminium occupies important role in STEELMAKING PRODUCTION as reductor always.But, with aluminium deoxidation, also there are some problems: the density of aluminium is little, cause aluminium scaling loss in molten steel serious, utilization ratio is lower; After aluminium deoxidation, generate dystectic A1
2o
3inclusion causes continous casting sprue dross, causes continuous casting to interrupt; The A1 that aluminium deoxidation generates
2o
3once inclusion remains in steel the transverse mechanical performance to steel is produced to detrimentally affect; Bauxite resource is day by day poor, causes aluminium price high, thereby steel-making cost is improved.
And although conventional calcium treatment technology can make A1
2o
3with Mns inclusion modification, effectively solved continous casting sprue dross, and generated relatively little calcium aluminate and the CaS inclusion of steel quality harm, and calcium processing also has some improvement to the tissue of steel and performance.But calcium treatment technology is also with serving disadvantageous problem: calcium is dealt with improperly and easily made the erosive velocity at the mouth of a river accelerate, and causes molten steel to pollute; Low and the easy gathering of calcium aluminate fusing point, grow up, get rid of, once but be trapped in and in steel, just become oarse-grained inclusion; Indeformable after the common rolling of calcium aluminate inclusion, become point-like inclusion.
Therefore, develop low aluminium, without calcium series steel making deoxidant, there is very important effect.
Document number be CN90101571.7 Patent Application Publication a kind of magnalium of used as heat generating agent, its composition is (weight percent): in Al24～36% and Si5～7%, Re0.5～1% or Si5.5～7.5%, Mn2～3% or Mn4.5～6.5, Re0.5～1%, Cu3～7%, at least and one group at the most, surplus is Mg and inevitable impurity.Document number be CN201110399553.5 Patent Application Publication a kind of magnalium and preparation method thereof, the composition of described alloy and mass percent thereof are: magnesium 60%～80%, aluminium 8%～10%, manganese 0.5%～2.0%, lanthanum 0.1%～1.0%, cerium 0.1%～1.0%, praseodymium 0.05%～0.5%, yttrium 0.1%～1.0%, zinc 0.1%～0.5%, strontium 0.5%～2.0%, impurity element 0.001%～0.5%, its preparation process is for adopting shielding gas that the metal of above-mentioned each component is prepared into alloy in High Temperature Furnaces Heating Apparatus, wherein smelting temperature is 600 ℃～800 ℃, teeming temperature is 650 ℃～750 ℃.Document number be CN200710052635.6 Patent Application Publication its core alloy powder of a kind of magnesium-aluminum alloy core-spun yarn chemical composition be by mass percentage: Mg5～13%, Al11～14%, surplus is Fe and inevitable impurity.Document number be CN200610096511.3 Patent Application Publication a kind of rare-earth contained Mg-Al alloy and melting technology thereof, Al:1～6wt% in this alloy, Zn:0.6～2wt%, Ce:0.1～2wt%, Fe :≤0.010wt%, Ni: < 0.001wt%.Its method for making is: first pure magnesium is put in crucible for smelting stove, be warming up to 700～750 ℃, then put into successively aluminium ingot and zinc ingot metal, at 690～740 ℃, add rare earth magnesium cerium master alloy, stir and standing 10～40 minutes, then at 680～740 ℃, pour into a mould, obtain ingot casting; Whole fusion process, adopts SF<sub TranNum="91">6</sub>, CO<sub TranNum="92">2</sub>and the mixed gas protected melt that forms of pressurized air.Document number be CN200910028340.4 Patent Application Publication a kind of magnalium and preparation method thereof, the quality percentage composition of this magnalium is: 7～10%Al, 0.5～2%Zn, 0.5～3%Sn, 0.05～3.5%Pb, all the other are Mg.The preparation method of this tough magnesium alloy: by the above-mentioned pure Al ingot preparing, Mg ingot, pure Sn bar, pure Pb piece, Zn ingot at N<sub TranNum="93">2</sub>/ CO<sub TranNum="94">2</sub>/ SF<sub TranNum="95">6</sub>heat fused together in hybrid protection atmosphere, N in hybrid protection atmosphere<sub TranNum="96">2</sub>, CO<sub TranNum="97">2</sub>and SF<sub TranNum="98">6</sub>volume ratio be 8: 16: 76.When temperature rises to 700～725 ℃, be incubated 4～8 minutes after the cooling tough magnesium alloy that obtains.
Summary of the invention
The object of the invention is to solve at least one in above-mentioned prior art problem.
One of object of the present invention is to provide a kind of low aluminium, without magnesium alloy and preparation method thereof and the deoxidation in steel making method for steel-making of calcium.
Another object of the present invention is to provide a kind of can avoid because forming bunch shape/strip A1 after steel-making aluminium deoxidation
2o
3be mingled with and affect the magnesium alloy and preparation method thereof and deoxidation in steel making method of steel quality.
Another object of the present invention is to provide a kind of magnesium alloy and preparation method thereof and deoxidation in steel making method that can avoid causing easily stopping up because of calcium deoxidation the problems such as the mouth of a river.
An aspect of of the present present invention provides a kind of preparation method who makes steel with magnesium alloy.Described preparation method is included in and under shielding gas atmosphere, carries out following steps: fusing magnesium ingot; Aluminium ingot is added and melted completely in magnesium liquid, and the weight ratio of aluminium ingot and magnesium liquid is 55～85:15～45; With 700～750 ℃ of insulation fusings, stir also standing; At 670～700 ℃, pour into a mould, obtain magnesium alloy ingot.
Another aspect of the present invention provides a kind of steel-making magnesium alloy.The composition of described magnesium alloy is by weight percentage by Al55%～85%, Mg15%～45%, and a small amount of inevitably impurity forms.
Another aspect of the present invention provides a kind of deoxidation in steel making method.Described deoxidation in steel making method comprises: adopt steel-making as above, with magnesium alloy, molten steel is carried out to deoxidation treatment.
Compared with prior art, beneficial effect of the present invention comprises: when molten steel is carried out to deoxidation, have stronger sweetening power, the inclusion after deoxidation of molten steel can be converted into complex inclusion mostly, can effectively improve steel quality.
Embodiment
Hereinafter, in connection with exemplary embodiment, describe magnesium alloy and preparation method thereof and deoxidation in steel making method for steel-making of the present invention in detail.
In one exemplary embodiment of the present invention, steel-making is included in and under shielding gas atmosphere, carries out following steps by the preparation method of magnesium alloy: melt magnesium ingot; Aluminium ingot is added and melted completely in magnesium liquid, and the weight ratio of aluminium ingot and magnesium liquid is 55～85:15～45; With 700～750 ℃ of insulation fusings, stir also standing; At 670～700 ℃, pour into a mould, obtain magnesium alloy ingot.Here, shielding gas can be by N
2, CO
2and pressurized air forms.
In another exemplary embodiment of the present invention, steel-making with the composition of magnesium alloy by weight percentage by Al55%～85%, Mg15%～45%, and a small amount of inevitably impurity forms.Preferably, the composition of this magnesium alloy can comprise by weight percentage: Al63%～77% and Mg23%～37%.
For the ease of use and obtain good deoxidation effect when deoxidation operates, in the present invention, magnesium alloy can be made to the alloy block with 50～100mm granularity; Or, magnesium alloy first can be crushed to the granularity of 2～5mm, then carry out cored operation, make cored-wire.
In another exemplary embodiment of the present invention, deoxidation in steel making method comprises: with magnesium alloy, the molten steel after to aluminium deoxidation carries out deoxidation treatment in the steel-making that adopts composition as mentioned above.The add-on of magnesium alloy can require to add according to molten steel composition and deoxidation.
In one exemplary embodiment of the present invention, deoxidation in steel making method can realize in the following manner: first described magnesium alloy is broken into the alloy block that granularity is 50～100mm, then in tapping process, after the 30s that taps, this alloy block is joined in ladle; Or first described magnesium alloy to be broken into granularity be the particle of 2～5mm and make cored-wire, then after finishing, tapping by feeding wire machine, described cored-wire is joined in molten steel.
The present invention makes steel has stronger sweetening power by magnesium alloy and preparation method thereof and deoxidation in steel making method in to deoxidation of molten steel, and after deoxidation of molten steel, inclusion is converted into complex inclusion, wherein A1 mostly
2o
3inclusion mainly changes MgOA1 into
2o
3deng, FeS and MnS sulfides are mingled with part and are transformed into the complex sulfides such as MgS and are mingled with, and effectively improve, improved steel quality, can form bunch shape/strip A1 after solving steel-making aluminium deoxidation
2o
3be mingled with, easily stop up after calcium deoxidation the problems such as the mouth of a river.
Below in conjunction with concrete example, describe exemplary embodiment of the present invention in detail.
Example 1
The magnesium alloy of this example is prepared in the following ways: fusing magnesium ingot; Aluminium ingot is added and melted completely in magnesium liquid, and the weight ratio of aluminium ingot and magnesium liquid is 55:45; With 700 ± 10 ℃ of insulation fusings, stir and standing 45 minutes; At 680 ± 10 ℃, pour into a mould, obtain magnesium alloy ingot, whole fusion process and casting process all adopt by N
2, CO
2and the mixed gas that pressurized air forms is done shielding gas.
In this example, the composition of the magnesium alloy of preparation is by weight percentage: Al54%, Mg45.6% and content are no more than 0.5% impurity.
Certain steel oxygen content in water is 1200ppm, S content is 0.010%, this magnesium alloy is broken into the alloy block that granularity is 70～90mm left and right, in the tapping process of above-mentioned molten steel, after the 30s that taps, add the alloy block of 4.5kg/tFe in ladle, molten steel is carried out deoxidation and inclusion is carried out to modification.
After testing, after this example deoxidation treatment, the oxygen level in molten steel is 180ppm, and desulfurization degree is 38%.
Example 2
The magnesium alloy of this example is prepared in the following ways: fusing magnesium ingot; Aluminium ingot is added and melted completely in magnesium liquid, and the weight ratio of aluminium ingot and magnesium liquid is 85:15; With 740 ± 10 ℃ of insulation fusings, stir and standing 45 minutes; At 690 ± 10 ℃, pour into a mould, obtain magnesium alloy ingot, whole fusion process and casting process all adopt by N
2, CO
2and the mixed gas that pressurized air forms is done shielding gas.
In this example, the composition of the magnesium alloy of preparation is by weight percentage: Al86.1%, Mg13.8% and content are no more than 0.1% impurity.
Certain steel oxygen content in water is 800ppm, S content is 0.008%, this magnesium alloy is broken into the particle that granularity is 3～4mm left and right and makes cored-wire through cored operation, after tapping finishes, by feeding wire machine, the cored-wire of 3kg/tFe is joined in molten steel to, molten steel is carried out deoxidation and inclusion is carried out to modification.
After testing, after this example deoxidation treatment, the oxygen level in molten steel is 160ppm, and desulfurization degree is 30%.
Example 3
The magnesium alloy of this example is prepared in the following ways: fusing magnesium ingot; Aluminium ingot is added and melted completely in magnesium liquid, and the weight ratio of aluminium ingot and magnesium liquid is 67:33; With 725 ± 10 ℃ of insulation fusings, stir and standing 45 minutes; At 690 ± 10 ℃, pour into a mould, obtain magnesium alloy ingot, whole fusion process and casting process all adopt by N
2, CO
2and the mixed gas that pressurized air forms is done shielding gas.
In this example, the composition of the magnesium alloy of preparation is by weight percentage: Al66.4%, Mg33.1% and content are no more than 0.5% impurity.
Certain steel oxygen content in water is 1000ppm, S content is 0.011%, this magnesium alloy is broken into the particle that granularity is 3～4mm left and right and makes cored-wire through cored operation, after tapping finishes, by feeding wire machine, the cored-wire of 4kg/tFe is joined in molten steel to, molten steel is carried out deoxidation and inclusion is carried out to modification.
After testing, after this example deoxidation treatment, the oxygen level in molten steel is 150ppm, and desulfurization degree is 36%.
Steel-making of the present invention comprises by the advantage of magnesium alloy and deoxidation in steel making method: can when molten steel is carried out to deoxidation, have stronger sweetening power, for example, deoxidation rate can reach more than 80%, and desulfurization degree can reach more than 30%; Can effectively improve steel quality.
Although described the present invention in conjunction with exemplary embodiment above, those of ordinary skills should be clear, in the situation that do not depart from the spirit and scope of claim, can carry out various modifications to above-described embodiment.
Claims (10)
1. a preparation method who makes steel with magnesium alloy, is characterized in that, described preparation method is included in and under shielding gas atmosphere, carries out following steps:
Fusing magnesium ingot;
Aluminium ingot is added and melted completely in magnesium liquid, and the weight ratio of aluminium ingot and magnesium liquid is 55～85:15～45;
With 700～750 ℃ of insulation fusings, stir also standing;
At 670～700 ℃, pour into a mould, obtain magnesium alloy ingot.
2. the preparation method of magnesium alloy for steel-making according to claim 1, is characterized in that, described shielding gas is by N
2, CO
2and pressurized air forms.
3. a steel-making magnesium alloy, is characterized in that, the composition of described magnesium alloy is by weight percentage by Al55%～85%, Mg15%～45%, and a small amount of inevitably impurity forms.
4. steel-making magnesium alloy according to claim 3, is characterized in that, the composition of described magnesium alloy comprises by weight percentage: Al63%～77% and Mg23%～37%.
5. steel-making magnesium alloy according to claim 3, is characterized in that, described magnesium alloy is the alloy block with 50～100mm granularity.
6. steel-making magnesium alloy according to claim 3, is characterized in that, described magnesium alloy has the granularity of 2～5mm and is made into cored-wire.
7. a deoxidation in steel making method, is characterized in that, described deoxidation in steel making method comprises: adopt the steel-making as described in any one in claim 3 to 6, with magnesium alloy, molten steel is carried out to deoxidation treatment.
8. deoxidation in steel making method according to claim 7, is characterized in that, described deoxidation in steel making method is first broken into described magnesium alloy the alloy block that granularity is 50～100mm, then in tapping process, after the 30s that taps, this alloy block is joined in ladle.
9. deoxidation in steel making method according to claim 7, it is characterized in that, described deoxidation in steel making method is first broken into described magnesium alloy granularity to be the particle of 2～5mm and to make cored-wire, then after tapping finishes, by feeding wire machine, described cored-wire is joined in molten steel.
10. deoxidation in steel making method according to claim 7, is characterized in that, described molten steel is molten steel or the molten steel after calcium deoxidation after aluminium deoxidation.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112501488A (en) * | 2020-10-22 | 2021-03-16 | 福建三宝钢铁有限公司 | Preparation process of H08A steel |
| CN114686737A (en) * | 2022-04-09 | 2022-07-01 | 五台云海镁业有限公司 | High-quality magnesium-based master alloy and production method thereof |
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| CN1908198A (en) * | 2006-08-18 | 2007-02-07 | 沈阳东北大学冶金技术研究所有限公司 | Aluminum-magnesium alloy deoxidizer for smelting steel and preparation method thereof |
| CN101265527A (en) * | 2008-05-06 | 2008-09-17 | 福州大学 | Smelting flame-proof protection method for magnesium alloy |
| CN102719714A (en) * | 2011-03-31 | 2012-10-10 | 宝山钢铁股份有限公司 | Alloy for refining precipitates in steel production process and application method thereof |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1908198A (en) * | 2006-08-18 | 2007-02-07 | 沈阳东北大学冶金技术研究所有限公司 | Aluminum-magnesium alloy deoxidizer for smelting steel and preparation method thereof |
| CN101265527A (en) * | 2008-05-06 | 2008-09-17 | 福州大学 | Smelting flame-proof protection method for magnesium alloy |
| CN102719714A (en) * | 2011-03-31 | 2012-10-10 | 宝山钢铁股份有限公司 | Alloy for refining precipitates in steel production process and application method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112501488A (en) * | 2020-10-22 | 2021-03-16 | 福建三宝钢铁有限公司 | Preparation process of H08A steel |
| CN114686737A (en) * | 2022-04-09 | 2022-07-01 | 五台云海镁业有限公司 | High-quality magnesium-based master alloy and production method thereof |
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Application publication date: 20140122 |