CN103540710B - Steel-making magnesium base complex deoxidization alloy and deoxidation in steel making method - Google Patents
Steel-making magnesium base complex deoxidization alloy and deoxidation in steel making method Download PDFInfo
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- CN103540710B CN103540710B CN201310545016.6A CN201310545016A CN103540710B CN 103540710 B CN103540710 B CN 103540710B CN 201310545016 A CN201310545016 A CN 201310545016A CN 103540710 B CN103540710 B CN 103540710B
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Abstract
The invention provides a kind of steel-making magnesium base complex deoxidization alloy and deoxidation in steel making method.The composition of described deoxygenated alloy is by weight percentage by Al10% ~ 20%, Mg35% ~ 50%, Ca10% ~ 25%, Si10% ~ 15%, the Fe of surplus and other inevitable impurity composition.Described deoxidation in steel making method comprises: adopt above-mentioned steel-making magnesium base complex deoxidization alloy to carry out deoxidation treatment to molten steel.Beneficial effect of the present invention comprises: while carrying out deoxidation to molten steel, have stronger sweetening power, the inclusion after deoxidation of molten steel can be converted into complex inclusion mostly, effectively can improve steel quality.
Description
Technical field
The invention belongs to steelmaking technical field, specifically, relate to a kind of steel-making by magnesium base complex deoxidization alloy and a kind of deoxidation in steel making method using this deoxygenated alloy.
Background technology
Usually, in steelmaking process, deoxidation is the process utilizing deoxidant element to reduce molten steel oxygen level, comprises floating and the eliminating of the deoxidation products produced in the deoxygenation and reaction process having the deoxidant element of strong avidity and oxygen to occur 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-, carbon will be made again to be oxidized, to make to produce bubble in steel, and have influence on the quality of steel; In addition, oxygen also can with FeO, Fe
3o
4and other oxide form is separated out, and is distributed on boundary surfaces, makes the plasticity of steel, mechanical property decline, and produce hot-short, cold short, bring a series of harm to the quality product of special purpose steel.
In modern STEELMAKING PRODUCTION, conventional method of deoxidation mainly contains three kinds: diffusive deoxidation, vacuum deaeration and bulk deoxidation.Due to aluminium have that deoxidizing capacity is strong, efficiency is high, inclusion floating speed is fast, residuing in steel can the advantage such as crystal grain thinning, so aluminium occupies important role as reductor in STEELMAKING PRODUCTION always.But also there are some problems with aluminium deoxidation: the density of aluminium is little, cause aluminium scaling loss in molten steel serious, utilization ratio is lower; Dystectic A1 is generated after aluminium deoxidation
2o
3inclusion causes continous casting sprue dross, causes continuous casting to interrupt; The A1 that aluminium deoxidation generates
2o
3inclusion is once remain in the horizontal mechanical performance generation detrimentally affect to steel in steel; Bauxite resource is day by day poor, causes aluminium price high, thus steel-making cost is improved.
And although conventional Calcium treatment technology can make A1
2o
3with Mns inclusion modification, efficiently solve continous casting sprue dross, and generate the steel quality relatively little calcium aluminate of harm and CaS inclusion, and the structure and properties of Calcium treatment to steel also has some improvement.But Calcium treatment technology is also with serving disadvantageous problem: the improper erosive velocity at the mouth of a river that easily makes of Calcium treatment is accelerated, and causes molten steel to pollute; Calcium aluminate fusing point is low and easily assemble, grow up, get rid of, but just becomes oarse-grained inclusion once be trapped in steel; Indeformable after the usual rolling of calcium aluminate inclusion, namely become point-like inclusion.
Therefore, develop low aluminium, low calcium series steel making deoxidant has very important effect.
Document number is the magnalium that application discloses a kind of used as heat generating agent of CN90101571.7, 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, and surplus is Mg and inevitable impurity.Document number be CN201110399553.5 application discloses 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 adopt 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 DEG C ~ 800 DEG C, teeming temperature is 650 DEG C ~ 750 DEG C.Document number is its core alloy powder of a kind of magnesium-aluminum alloy core-spun yarn chemical composition by mass percentage that application discloses of CN200710052635.6: Mg5 ~ 13%, Al11 ~ 14%, and surplus is Fe and inevitable impurity.Document number be CN200610096511.3 application discloses a kind of rare-earth contained Mg-Al alloy and melting technology thereof, Al:1 ~ 6wt%, Zn:0.6 ~ 2wt%, Ce:0.1 ~ 2wt% in this alloy, Fe :≤0.010wt%, Ni:<0.001wt%.Its method for making is: first put in crucible for smelting stove by pure magnesium, is warming up to 700 ~ 750 DEG C, then puts into aluminium ingot and zinc ingot metal successively, rare earth magnesium cerium master alloy is added at 690 ~ 740 DEG C, stir and leave standstill 10 ~ 40 minutes, then pouring into a mould at 680 ~ 740 DEG C, obtaining ingot casting; Whole fusion process, adopts SF
6, CO
2and the mixed gas protected melt that pressurized air forms.Document number be CN200910028340.4 application discloses a kind of magnalium and preparation method thereof, the mass percentage of this magnalium is: 7 ~ 10%Al, 0.5 ~ 2%Zn, 0.5 ~ 3%Sn, 0.05 ~ 3.5%Pb, and all the other are Mg.The preparation method of this tough magnesium alloy: the pure Al ingot prepared above-mentioned, Mg ingot, pure Sn bar, pure Pb block, Zn ingot are at N
2/ CO
2/ SF
6heat fused together in hybrid protection atmosphere, N in hybrid protection atmosphere
2, CO
2and SF
6volume ratio be 8: 16: 76.When temperature rises to 700 ~ 725 DEG C, be incubated cooling after 4 ~ 8 minutes and obtain tough magnesium alloy.
Summary of the invention
The object of the invention is to solve at least one item in above-mentioned prior art problem.
An object of the present invention is the steel-making magnesium base complex deoxidization alloy and the deoxidation in steel making method thereof that provide a kind of low aluminium, low calcium.
Another object of the present invention is to provide one can avoid because tufted/strip A1 can be formed after steel-making aluminium deoxidation
2o
3be mingled with and affect deoxygenated alloy and the deoxidation in steel making method thereof of steel quality.
Another object of the present invention is to provide a kind of deoxygenated alloy and the deoxidation in steel making method thereof that can avoid causing easily blocking 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 steel-making magnesium base complex deoxidization alloy.The composition of described deoxygenated alloy is by weight percentage by Al10% ~ 20%, Mg35% ~ 50%, Ca10% ~ 25%, Si10% ~ 15%, the Fe of surplus and other inevitable impurity composition.
Another aspect provides a kind of deoxidation in steel making method.Described deoxidation in steel making method comprises: adopt steel-making magnesium base complex deoxidization alloy as above to carry out deoxidation treatment to molten steel.
Compared with prior art, beneficial effect of the present invention comprises: while carrying out deoxidation to molten steel, have stronger sweetening power, the inclusion after deoxidation of molten steel can be converted into complex inclusion mostly, effectively can improve steel quality.
Embodiment
Hereinafter, steel-making magnesium base complex deoxidization alloy of the present invention and deoxidation in steel making method will be described in detail in conjunction with exemplary embodiment.
In one exemplary embodiment of the present invention, steel-making with the composition of magnesium base complex deoxidization alloy by weight percentage by Al10% ~ 20%, Mg35% ~ 50%, Ca10% ~ 25%, Si10% ~ 15%, the Fe of surplus and other inevitable impurity composition.Preferably, the composition of this deoxygenated alloy can comprise by weight percentage: Al13% ~ 18%, Mg39% ~ 47%, Ca13% ~ 22%, Si12% ~ 14%.
For the ease of using and obtain good deoxidation effect when deoxidation operation, in the present invention, deoxygenated alloy can be made the alloy block with 50 ~ 100mm granularity; Or, deoxygenated 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: adopt the steel-making magnesium base complex deoxidization alloy of composition described above to carry out deoxidation treatment to the molten steel after aluminium deoxidation or after calcium deoxidation.The add-on of deoxygenated alloy can require to add according to molten steel composition and deoxidation.Magnesium base complex deoxidization alloy of the present invention also can be used for directly carrying out deoxidation to common molten steel.
In one exemplary embodiment of the present invention, deoxidation in steel making method is by realizing with under type: first described deoxygenated alloy is broken into the alloy block that granularity is 50 ~ 100mm, then joins in ladle by this alloy block after tapping 30s in tapping process; Or, first described deoxygenated alloy be broken into the particle that granularity is 2 ~ 5mm and make cored-wire, then by feeding wire machine, described cored-wire being joined in molten steel after tapping terminates.
Steel-making magnesium base complex deoxidization alloy of the present invention and deoxidation in steel making method have stronger sweetening power while to deoxidation of molten steel, and after deoxidation of molten steel, inclusion is converted into complex inclusion mostly, wherein A1
2o
3inclusion is predominantly converted to MgOA1
2o
3deng, FeS and MnS sulfides is mingled with complex sulfides such as being transformed into MnS, CaS and MgS and is mingled with, and effectively improves, improves steel quality, can form tufted/strip A1 after solving steel-making aluminium deoxidation
2o
3be mingled with, after calcium deoxidation, easily block the problems such as the mouth of a river.
Exemplary embodiment of the present invention is described in detail below in conjunction with concrete example.
Example 1
In this example, the composition of steel-making magnesium base complex deoxidization alloy is by weight percentage: Al10%, Mg50%, Ca10%, Si12%, all the other are no more than 1% for Fe and content.
This deoxygenated alloy is broken into the alloy block that granularity is about 70 ~ 90mm, in the tapping process of above-mentioned molten steel, after tapping 30s, adds the alloy block of 4kg/tFe in ladle, deoxidation is carried out to molten steel and modification is carried out to inclusion.
After testing, after this example deoxidation treatment, the oxygen level in molten steel is 190ppm, FeS and MnS sulfides being mingled with the transformation efficiency that complex sulfides such as being transformed into MnS, CaS and MgS is mingled with is 45%, and desulfurization degree is 23%.
Example 2
In this example, the composition of steel-making magnesium base complex deoxidization alloy is by weight percentage: Al20%, Mg35%, Ca25%, Si15%, all the other are the impurity that Fe and content are no more than 0.5%.
This deoxygenated alloy be broken into the particle that granularity is about 3 ~ 4mm and make cored-wire through cored operation, by feeding wire machine, the cored-wire of 3kg/tFe being joined in molten steel after tapping and terminating, deoxidation is carried out to molten steel and modification is carried out to inclusion.
After testing, after this example deoxidation treatment, the oxygen level in molten steel is 185ppm, FeS and MnS sulfides being mingled with the transformation efficiency that complex sulfides such as being transformed into MnS, CaS and MgS is mingled with is 48%, and desulfurization degree is 25%.
Example 3
In this example, the composition of steel-making magnesium base complex deoxidization alloy is by weight percentage: Al16%, Mg40%, Ca21%, Si12%, all the other are the impurity that Fe and content are no more than 0.8%.
This deoxygenated alloy is broken into the alloy block that granularity is about 70 ~ 90mm, in the tapping process of above-mentioned molten steel, after tapping 30s, adds the alloy block of 5kg/tFe in ladle, deoxidation is carried out to molten steel and modification is carried out to inclusion.
After testing, after this example deoxidation treatment, 170ppm, FeS and MnS sulfides being mingled with the transformation efficiency that complex sulfides such as being transformed into MnS, CaS and MgS is mingled with is 53%, and desulfurization degree is 31%.
The advantage of steel-making deoxygenated alloy of the present invention and method of deoxidation comprises: while carrying out deoxidation to molten steel, can have stronger sweetening power, such as, after DNA vaccine, oxygen level can be controlled in below 200ppm, and desulfurization degree can reach more than 20%; Can by inclusion (such as, the tufted/strip A1 after deoxidation of molten steel
2o
3, FeS and MnS sulfides is mingled with) be mostly converted into corresponding complex inclusion, FeS and MnS sulfides is mingled with the transformation efficiency that complex sulfides such as being transformed into MnS, CaS and MgS is mingled with and can reaches more than 40%; Effectively can improve steel quality.
Although describe the present invention in conjunction with exemplary embodiment above, those of ordinary skill in the art should be clear, when not departing from the spirit and scope of claim, can carry out various amendment to above-described embodiment.
Claims (8)
1. a steel-making magnesium base complex deoxidization alloy, is characterized in that, the composition of described deoxygenated alloy is by weight percentage by Al 10% ~ 18%, Mg 35% ~ 50%, Ca 10% ~ 25%, Si 10% ~ 15%, the Fe of surplus and other inevitable impurity composition.
2. steel-making magnesium base complex deoxidization alloy according to claim 1, it is characterized in that, the composition of described deoxygenated alloy comprises by weight percentage: Al 13% ~ 18%, Mg 39% ~ 47%, Ca13% ~ 22%, Si 12% ~ 14%.
3. steel-making magnesium base complex deoxidization alloy according to claim 1, it is characterized in that, described deoxygenated alloy is the alloy block with 50 ~ 100mm granularity.
4. steel-making magnesium base complex deoxidization alloy according to claim 1, it is characterized in that, described deoxygenated alloy has the granularity of 2 ~ 5mm and is made into cored-wire.
5. a deoxidation in steel making method, is characterized in that, described deoxidation in steel making method comprises: adopt as the steel-making magnesium base complex deoxidization alloy in Claims 1-4 as described in any one carries out deoxidation treatment to molten steel.
6. deoxidation in steel making method according to claim 5, is characterized in that, described deoxygenated alloy is first broken into the alloy block that granularity is 50 ~ 100mm by described deoxidation in steel making method, is then joined in ladle by this alloy block after tapping 30s in tapping process.
7. deoxidation in steel making method according to claim 5, it is characterized in that, described deoxygenated alloy is first broken into particle that granularity is 2 ~ 5mm and makes cored-wire by described deoxidation in steel making method, is then joined in molten steel by described cored-wire by feeding wire machine after tapping terminates.
8. deoxidation in steel making method according to claim 5, is characterized in that, described molten steel is the molten steel after aluminium deoxidation or the molten steel after calcium deoxidation.
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| CN106521083A (en) * | 2016-11-14 | 2017-03-22 | 上海大学 | Core material of magnesium-calcium-aluminum-iron alloy core-spun yarns and application thereof |
| CN113981173A (en) * | 2021-11-17 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Magnesium-containing core-spun yarn and application method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1141347A (en) * | 1996-04-23 | 1997-01-29 | 谢廷声 | Multi-element alloy for deoxidising molten steel and alloying thereof |
| CN1316527A (en) * | 2001-03-21 | 2001-10-10 | 何丽华 | Al-Mg-Fe alloy for deoxidation and desulfurization in smelting steel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1141347A (en) * | 1996-04-23 | 1997-01-29 | 谢廷声 | Multi-element alloy for deoxidising molten steel and alloying thereof |
| CN1316527A (en) * | 2001-03-21 | 2001-10-10 | 何丽华 | Al-Mg-Fe alloy for deoxidation and desulfurization in smelting steel |
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