CN103540710A - Magnesium base complex deoxidization alloy for steelmaking and steelmaking deoxidization method - Google Patents
Magnesium base complex deoxidization alloy for steelmaking and steelmaking deoxidization method Download PDFInfo
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- CN103540710A CN103540710A CN201310545016.6A CN201310545016A CN103540710A CN 103540710 A CN103540710 A CN 103540710A CN 201310545016 A CN201310545016 A CN 201310545016A CN 103540710 A CN103540710 A CN 103540710A
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Abstract
The invention provides a magnesium base complex deoxidization alloy for steelmaking and a steelmaking deoxidization method. The deoxidization alloy comprises the following components by weight percent: 10-20% of Al, 35-50% of Mg, 10-25% of Ca, 10-15% of Si and the balance of Fe and inevitable impurities. The steelmaking deoxidization method comprises the step of adopting the magnesium base complex deoxidization alloy for steelmaking to carry out deoxidization treatment on molten steel. The deoxidization alloy has the beneficial effects that the deoxidization alloy has relatively strong desulfurization capability while deoxidizing molten steel, can convert most inclusions after molten steel deoxidization to complex inclusions, and can effectively improve the molten 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 of using this deoxygenated 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, low calcium series steel making deoxidant and 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
6, CO
2and 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
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 ℃, 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 magnesium base complex deoxidization alloy and the deoxidation in steel making method thereof for steel-making of low aluminium, low 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 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 stopping up because of calcium deoxidation the problems such as the mouth of a river.
An aspect of of the present present invention provides magnesium base complex deoxidization alloy for a kind of steel-making.The composition of described deoxygenated alloy is by weight percentage by Al10%～20%, Mg35%～50%, and Ca10%～25%, Si10%～15%, the Fe of surplus and other inevitable impurity form.
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 base complex deoxidization 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 base complex deoxidization alloy 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 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 form.Preferably, the composition of this deoxygenated alloy can comprise by weight percentage: Al13%～18%, Mg39%～47%, Ca13%～22%, Si12%～14%.
For the ease of use and obtain good deoxidation effect when deoxidation operates, in the present invention, deoxygenated alloy can be made to 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: the steel-making that adopts composition as mentioned above with magnesium base complex deoxidization alloy to aluminium deoxidation after or molten steel after calcium deoxidation carry out deoxidation treatment.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 common molten steel being carried out to deoxidation.
In one exemplary embodiment of the present invention, deoxidation in steel making method can realize in the following manner: first described deoxygenated 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 deoxygenated 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.
Steel-making of the present invention has stronger sweetening power with magnesium base complex deoxidization alloy 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 complex sulfides such as being transformed into MnS, CaS and MgS and are mingled with, and effectively improve, improved steel quality, after solution steel-making aluminium deoxidation, can form bunch shape/strip A1
2o
3be mingled with, after calcium deoxidation, easily stop up 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
In this example, steel-making with the composition of magnesium base complex deoxidization alloy is by weight percentage: Al10%, and 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 70～90mm left and right, in the tapping process of above-mentioned molten steel, after the 30s that taps, adds the alloy block of 4kg/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 190ppm, and it is 45% that FeS and MnS sulfides are mingled with to the transformation efficiency that complex sulfides such as being transformed into MnS, CaS and MgS is mingled with, and desulfurization degree is 23%.
Example 2
In this example, steel-making with the composition of magnesium base complex deoxidization alloy is by weight percentage: Al20%, and Mg35%, Ca25%, Si15%, all the other are no more than 0.5% impurity for Fe and content.
This deoxygenated 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, 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 185ppm, and it is 48% that FeS and MnS sulfides are mingled with to the transformation efficiency that complex sulfides such as being transformed into MnS, CaS and MgS is mingled with, and desulfurization degree is 25%.
Example 3
In this example, steel-making with the composition of magnesium base complex deoxidization alloy is by weight percentage: Al16%, and Mg40%, Ca21%, Si12%, all the other are no more than 0.8% impurity for Fe and content.
This deoxygenated 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, adds the alloy block of 5kg/tFe in ladle, molten steel is carried out deoxidation and inclusion is carried out to modification.
After testing, after this example deoxidation treatment, 170ppm, it is 53% that FeS and MnS sulfides are mingled with to the transformation efficiency that complex sulfides such as being transformed into MnS, CaS and MgS is mingled with, desulfurization degree is 31%.
Steel-making of the present invention comprises by the advantage of deoxygenated alloy and method of deoxidation: can when molten steel is carried out to deoxidation, have stronger sweetening power, for example, after deoxidation rate, oxygen level can be controlled in below 200ppm, and desulfurization degree can reach more than 20%; Can for example, by (, bunch shape/strip A1 of the inclusion after deoxidation of molten steel
2o
3, FeS and MnS sulfides be mingled with) be mostly converted into corresponding complex inclusion, FeS and MnS sulfides are mingled with to the transformation efficiency that complex sulfides such as being transformed into MnS, CaS and MgS is mingled with and can reach more than 40%; 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 (8)
1. a magnesium base complex deoxidization alloy for steel-making, is characterized in that, the composition of described deoxygenated alloy is by weight percentage by Al10%～20%, Mg35%～50%, and Ca10%～25%, Si10%～15%, the Fe of surplus and other inevitable impurity forms.
2. magnesium base complex deoxidization alloy for steel-making according to claim 1, is characterized in that, the composition of described deoxygenated alloy comprises by weight percentage: Al13%～18%, Mg39%～47%, Ca13%～22%, Si12%～14%.
3. magnesium base complex deoxidization alloy for steel-making according to claim 1, is characterized in that, described deoxygenated alloy is the alloy block with 50～100mm granularity.
4. magnesium base complex deoxidization alloy for steel-making according to claim 1, 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 the steel-making as described in any one in claim 1 to 4, with magnesium base complex deoxidization alloy, molten steel is carried out to deoxidation treatment.
6. deoxidation in steel making method according to claim 5, is characterized in that, described deoxidation in steel making method is first broken into described deoxygenated 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.
7. deoxidation in steel making method according to claim 5, it is characterized in that, described deoxidation in steel making method is first broken into described deoxygenated 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.
8. deoxidation in steel making method according to claim 5, 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 |
|---|---|---|---|---|
| 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 |
-
2013
- 2013-11-06 CN CN201310545016.6A patent/CN103540710B/en active Active
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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN103540710B (en) | 2015-09-16 |
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