CN104233044B - The production method of a kind of high aluminum steel - Google Patents
The production method of a kind of high aluminum steel Download PDFInfo
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- CN104233044B CN104233044B CN201410525735.6A CN201410525735A CN104233044B CN 104233044 B CN104233044 B CN 104233044B CN 201410525735 A CN201410525735 A CN 201410525735A CN 104233044 B CN104233044 B CN 104233044B
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Abstract
The present invention provides the production method of a kind of high aluminum steel. Described production method comprises smelting molten steel and carries out even casting, and wherein, in casting process, big bag to tundish adopts long nozzle and blowing argon casting; the plug rod not blowing argon gas of tundish, and, when starting to pour into a mould; first pour into a mould not high aluminum steel, after drawing speed stable, start to pour into a mould high aluminum steel again. Method according to the present invention efficiently avoid high aluminum steel and occurs that in molten steel, secondary oxidation occurs in aluminium when pouring into a mould; prevent from molten steel produces a large amount of alumina inclusions; thus avoid it and affect quality product and covering slag lubricant effect, avoid the generation of bleed-out accident.
Description
Technical field
The present invention relates to steelmaking technical field, more particularly, it relates to the production method of a kind of high aluminum steel.
Background technology
The advanced high-strength steel of the automobile that transformation induced plasticity steel (TRIP steel) is important; find when certain steel mill smelts this steel grade; owing in this steel grade, aluminium content is higher; casting cycle easily affects covering slag lubricity; thus cause slab quality problem and the generation of bleed-out accident; in the prior art, not yet there is overcoming the high aluminum steel method of above-mentioned technical barrier.
Summary of the invention
For the deficiencies in the prior art, an object of the present invention is to solve in above-mentioned prior art the one or more problems existed. Such as, an object of the present invention is that providing a kind of can prevent high aluminum steel from occurring bleed-out in casting process or producing the production method of the high aluminum steel of slab quality defect.
In order to realize above-mentioned purpose, the present invention provides the production method of a kind of high aluminum steel. Described production method comprises smelting molten steel and carries out even casting, and wherein, in casting process, big bag to tundish adopts long nozzle and blowing argon casting; the plug rod not blowing argon gas of tundish, and, when starting to pour into a mould; first pour into a mould not high aluminum steel, after drawing speed stable, start to pour into a mould high aluminum steel again.
An embodiment of the production method according to height aluminum steel of the present invention, the argon blowing rate of control long nozzle is at more than 60L/min.
An embodiment of the production method according to height aluminum steel of the present invention, by mass percentage, in described high aluminum steel, aluminium content is 0.75��0.85%.
An embodiment of the production method according to height aluminum steel of the present invention, the chemical composition of described high aluminum steel comprises by mass percentage: the Fe of C:0.30��0.34%, Si:0.75��0.90%, Mn:1.85��2.00%, P��0.020%, S��0.005%, Als:0.75��0.85%, N��0.0040%, V:0.07��0.11%, Ti:0.13��0.17% and surplus and inevitable impurity.
An embodiment of the production method according to height aluminum steel of the present invention, the chemical composition of described not high aluminum steel comprises by mass percentage: the Fe of C:0.13��0.18%, Si:0.05��0.13%, Mn:0.20��0.30%, P��0.025%, S��0.020% and surplus and inevitable impurity.
An embodiment of the production method according to height aluminum steel of the present invention, the speed of drawing in described casting process is 0.9��1.0m/min.
An embodiment of the production method according to height aluminum steel of the present invention, described production method pours into a mould described high aluminum steel at last stove.
Compared with prior art; the useful effect of the present invention comprise adopt the present invention method efficiently avoid high aluminum steel pour into a mould time occur that in molten steel, secondary oxidation occurs in aluminium; prevent from molten steel produces a large amount of alumina inclusions; thus avoid it and affect quality product and covering slag lubricant effect, avoid the generation of bleed-out accident.
Embodiment
Hereinafter, the production method of the high aluminum steel according to the present invention will be described in detail in conjunction with exemplary embodiment.
Through production scene many stoves height aluminum steel production process is carried out observation and analysis discovery; high aluminum steel easily occurs that the major cause of bleed-out accident is: due to higher containing Al in high aluminum steel; if by secondary oxidation in casting cycle; will cause in molten steel and produce a large amount of alumina inclusions; affect the lubricant effect of board quality and covering slag; even cause bleed-out accident; so in casting cycle; mainly how to prevent molten steel from by secondary oxidation and affecting covering slag lubricant effect; based on this, the present invention proposes the production method of a kind of high aluminum steel.
The production method of high according to an exemplary embodiment of the present invention aluminum steel mainly comprises following operation:
In casting process, big bag to tundish adopts long nozzle and blowing argon casting, the plug rod not blowing argon gas of tundish, and, when starting to pour into a mould, first pour into a mould not high aluminum steel, after drawing speed stable, start to pour into a mould high aluminum steel again. Wherein, not high aluminum steel selects that inclusion is few, pourability of molten steel good and the steel grade close with smelting high aluminium steel chemical composition.
Such as, in an exemplary embodiment, the chemical composition of the high aluminum steel smelted comprises by mass percentage: the Fe of C:0.30��0.34%, Si:0.75��0.90%, Mn:1.85��2.00%, P��0.020%, S��0.005%, Als:0.75��0.85%, N��0.0040%, V:0.07��0.11%, Ti:0.13��0.17% and surplus and inevitable impurity, and the yield strength of this steel grade is at more than 980MPa. And the chemical composition stating not high aluminum steel adopted comprises by mass percentage: the Fe of C:0.13��0.18%, Si:0.05��0.13%, Mn:0.20��0.30%, P��0.025%, S��0.020% and surplus and inevitable impurity.
Preferably, the argon blowing rate of control long nozzle, at more than 60L/min, to improve protective casting effect, prevents molten steel from when injecting tundish by big bag (ladle), secondary oxidation of steel occurring, produces a large amount of Al2O3It is mingled with.
According to the present invention, adopt different steel grade to water with bag is mixed, namely first pour into a mould other steel grade at the secondary a few stove above of bag, and then pour into a mould high aluminum steel, high aluminum steel can be made to draw when pouring into a mould speed to keep stable, had certain molten steel amount in tundish simultaneously, avoided molten steel by secondary oxidation. If just pouring into a mould high aluminum steel at the first stove; need owing to drawing speed slowly to increase from low to high; low draw speed the time longer; such as, the first stove draws speed slowly to rise to 0.9m/min from 0.3m/min, it is necessary to about 10min; the aluminium in covering slag composition and steel is caused fully to react and reaction product enters covering slag; covering slag viscosity is raised and mobility variation, affects the lubricant effect of covering slag, bleed-out accident or slab quality defect will be caused.
And shut-off plug rod Argon be because: plug rod Argon time will increase covering slag and molten steel reacting dynamics condition, the aluminium in molten steel enters into covering slag, formed such as, high melting compound (Al2O3), the basicity of covering slag, viscosity are raised, seriously affects covering slag lubricant effect.
In order to understand the above-mentioned exemplary embodiment of the present invention better, below in conjunction with concrete example, it is further described.
Example:
In casting process, big bag to tundish adopts long nozzle and blowing argon casting, and the argon blowing rate of control long nozzle is 65L/min; The plug rod not blowing argon gas of tundish; When starting to pour into a mould, the steel grades first poured into a mould comprises by mass percentage: the Fe of C:0.16%, Si:0.12%, Mn:0.24%, P:0.012%, S:0.016% and surplus and inevitable impurity; Start to pour into a mould the high aluminum steel of this example at last stove, the chemical composition of gained height aluminum steel comprises by mass percentage: the Fe of C:0.34%, Si:0.89%, Mn:1.90%, Als:0.82%, V:0.08%, Ti:0.17%, P:0.015%, S:0.002% and surplus and inevitable impurity.
According to this example, a stove steel of only having cast, just successfully cast obtains high aluminum steel, and does not cause bleed-out accident, and other steel mill need to cast more than 2��3 times, could successfully cast, it is very difficult to avoid the bleed-out accident in casting cycle.
In sum, the present invention provides the production method of a kind of high aluminum steel, by long nozzle Argon and control argon blowing rate, different steel grade waters with bag is mixed and pours into a mould the technical measures such as high aluminum steel and shut-off plug rod Argon after first pouring into a mould other steel grade and jointly achieve the aluminium prevented in casting process in molten steel by secondary oxidation, avoid and molten steel produces a large amount of alumina inclusions, avoid the lubricant effect that it affects board quality and covering slag, thus, occur with preventing the generation of bleed-out accident or slab quality defect, produced the high aluminum steel quality obtained good, can be applicable to produce high quality car panel.
Although above by describing the present invention in conjunction with exemplary embodiment, but it should be clear to a person skilled in the art that, when not departing from the spirit and scope that claim limits, can the exemplary embodiment of the present invention is carried out various amendment and change.
Claims (7)
1. the production method of a high aluminum steel; it is characterized in that; described production method comprises smelting molten steel and carries out even casting; wherein, in casting process, big bag to tundish adopts long nozzle and blowing argon casting, the plug rod not blowing argon gas of tundish; and; when starting to pour into a mould, first pour into a mould not high aluminum steel, after drawing speed stable, start to pour into a mould high aluminum steel again.
2. the production method of high aluminum steel according to claim 1, it is characterised in that, the argon blowing rate of control long nozzle is at more than 60L/min.
3. the production method of high aluminum steel according to claim 1, it is characterised in that, by mass percentage, in described high aluminum steel, aluminium content is 0.75��0.85%.
4. the production method of high aluminum steel according to claim 1, it is characterized in that, the chemical composition of described high aluminum steel comprises by mass percentage: the Fe of C:0.30��0.34%, Si:0.75��0.90%, Mn:1.85��2.00%, P��0.020%, S��0.005%, Als:0.75��0.85%, N��0.0040%, V:0.07��0.11%, Ti:0.13��0.17% and surplus and inevitable impurity.
5. the production method of high aluminum steel according to claim 1, it is characterized in that, the chemical composition of described not high aluminum steel comprises by mass percentage: the Fe of C:0.13��0.18%, Si:0.05��0.13%, Mn:0.20��0.30%, P��0.025%, S��0.020% and surplus and inevitable impurity.
6. the production method of high aluminum steel according to claim 1, it is characterised in that, the speed of drawing in described casting process is 0.9��1.0m/min.
7. the production method of high aluminum steel according to claim 1, it is characterised in that, pour into a mould described high aluminum steel at last stove.
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| CN107570675A (en) * | 2017-08-01 | 2018-01-12 | 新疆八钢铁股份有限公司 | The pouring technology of improved continuous small-billet casting production medium and high carbon steel |
| CN107400828B (en) * | 2017-08-04 | 2019-01-04 | 攀钢集团攀枝花钢铁研究院有限公司 | One kind cold-rolled steel sheet of high strength and ductility containing vanadium and preparation method thereof |
| CN109175287B (en) * | 2018-11-05 | 2020-06-19 | 首钢集团有限公司 | Continuous casting method for high-aluminum steel plate blank |
| CN111408698B (en) * | 2020-05-06 | 2021-06-29 | 攀钢集团西昌钢钒有限公司 | Control method for surface quality of high-strength high-aluminum high-vanadium steel casting blank |
| CN112391571A (en) * | 2020-11-25 | 2021-02-23 | 攀钢集团西昌钢钒有限公司 | Control method for cleanliness of high-strength high-aluminum high-manganese steel |
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| CN102409222B (en) * | 2010-09-21 | 2014-09-03 | 鞍钢股份有限公司 | Continuously annealed or hot galvanized cold rolled transformation induced plasticity steel plate and preparation method thereof |
| CN101956040B (en) * | 2010-10-14 | 2012-01-25 | 攀钢集团钢铁钒钛股份有限公司 | Producing method of clean steel |
| CN102069161A (en) * | 2010-12-31 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Different steel grade continuous casting method |
| CN103290316A (en) * | 2013-06-11 | 2013-09-11 | 鞍钢股份有限公司 | Flexible manufacturing method of hot-rolled structural steel plate |
| CN103469050B (en) * | 2013-09-22 | 2015-02-18 | 中天钢铁集团有限公司 | Aluminum-containing cold forging steel smelting process |
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