CN102212650A - Method for controlling oxygen in low-carbon low-silicon-aluminum (Al) killed steel - Google Patents
Method for controlling oxygen in low-carbon low-silicon-aluminum (Al) killed steel Download PDFInfo
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- CN102212650A CN102212650A CN2011101494645A CN201110149464A CN102212650A CN 102212650 A CN102212650 A CN 102212650A CN 2011101494645 A CN2011101494645 A CN 2011101494645A CN 201110149464 A CN201110149464 A CN 201110149464A CN 102212650 A CN102212650 A CN 102212650A
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- Prior art keywords
- steel
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- aluminum
- aluminium
- argon
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 229910000655 Killed steel Inorganic materials 0.000 title claims abstract description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 13
- 239000001301 oxygen Substances 0.000 title claims abstract description 13
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 100
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 100
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 94
- 239000010959 steel Substances 0.000 claims abstract description 94
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 68
- 229910052786 argon Inorganic materials 0.000 claims abstract description 34
- 238000007670 refining Methods 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 20
- 239000002893 slag Substances 0.000 claims abstract description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 15
- 239000010703 silicon Substances 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 8
- 239000004411 aluminium Substances 0.000 claims description 57
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910001208 Crucible steel Inorganic materials 0.000 claims description 7
- 238000000746 purification Methods 0.000 claims description 7
- 238000009628 steelmaking Methods 0.000 claims description 7
- 238000006477 desulfuration reaction Methods 0.000 abstract description 4
- 230000023556 desulfurization Effects 0.000 abstract description 4
- 238000009847 ladle furnace Methods 0.000 abstract description 2
- 239000006187 pill Substances 0.000 abstract 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000007664 blowing Methods 0.000 abstract 1
- 238000005266 casting Methods 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 206010058490 Hyperoxia Diseases 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000222 hyperoxic effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a control method of oxygen in low-carbon low-silicon-aluminum (Al)-killed steel. The control method comprises the following steps: (1) pre-treating hot metal and making steel in a converter; (2) external refining: (a) adding aluminum for the first time after refining for 10 minutes, wherein aluminum wires are added to molten steel, aluminum pills are added to steel slag and argon-stirring is carried out; (b) adding aluminum for the second time after refining for 20-30 minutes, wherein aluminum wires are added to molten steel, aluminum pills are added to steel slag and argon-stirring is carried out continuously; and (c) when Als in the molten steel reaches a set value after refining for 35-45 minutes, stopping adding aluminum; and when the Als does not reach the set value, adding aluminum particularly referring to aluminum wires only for the third time, and continuously performing argon-stirring; (3) purifying by bottom soft-argon-blowing; and (4) casting the molten steel into steel billet for later use. The control method provided by the invention has the beneficial effects of lowering average silicon content from 0.021% to 0.012%, obviously reducing a steel change phenomenon caused by high silicon content and reducing Als loss caused by forced argon stirring during the desulfurization process in a ladle furnace.
Description
Technical field
The present invention relates to the control method of inclusion in the molten steel, specifically belong to the control method of oxygen in the low carbon low silicon aluminium killed steel.
Background technology
Tapping deoxidization (alloying deoxidation, aluminium deoxidation) → refining furnace deoxidation (aluminium deoxidation) behind the traditional low S molten iron of the main employing of low carbon low silicon aluminium killed steel smelting → converter terminal hyperoxia high temperature → stove, it makes reductibility desulfurization by slag operational path for aluminium deoxidation.Because the deoxidation degree of depth is difficult to control in sweetening process, cause the slag deoxidation to cross the control difficulty that causes silicon deeply, have simultaneously that molten iron is contained S is strict, the deoxidization technique circuit is long and cause the aluminium consumption big, and the refining furnace sweetening power problem such as can not effectively bring into play because of the influence that is subjected to Si.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, provide a kind of by control aluminium amount, argon flow amount and churning time in refining process, thereby after desulfurization is finished to the control of silicon, improve refining furnace and control the oxygen ability accurately, and reduce the aluminium consumption, the control method of oxygen in the low carbon low silicon aluminium killed steel of raising product percent of pass.
Realize the technical measures of above-mentioned purpose:
The control method of oxygen in a kind of low carbon low silicon aluminium killed steel, its step:
1) carries out hot metal pretreatment and steel-making;
2) carry out external refining:
A) in 10 minutes after refining begins, add aluminium for the first time according to kilogram/ton steel, wherein, add aluminum steel in molten steel, add-on accounts for this and adds 50～100% of aluminium gross weight; Add aluminum shot in slag, its add-on adds 0～50% of aluminium gross weight for this; And Argon stirring in molten steel simultaneously, the amount of being blown into was controlled at 600～1000Nl/ minute, and the time is 3～5 minutes;
B) be refined in 20～30 minutes, carrying out adding the second time aluminium according to kilogram/ton steel, wherein, adding aluminum steel in molten steel, add-on accounts for this and adds 50～70% of aluminium gross weight; Add aluminum shot in slag, its add-on adds 30～50% of aluminium gross weight for this; And continue Argon stirring in molten steel, and being blown into the argon amount and being controlled at 800～1200Nl/ minute, the time is 5～10 minutes;
C), when the AlS in the molten steel reaches set(ting)value, then no longer add aluminium being refined in 35～45 minutes; When AlS does not arrive set(ting)value, then add aluminium for the third time according to kilogram/ton steel, it all is an aluminum steel; And continue Argon and stir, when the S content in the steel during at 80～120ppm, the Argon amount was controlled at 800～1000Nl/ minute, and the time is 1～3 minute; When the S content in the steel during at 50～80ppm, the Argon amount was controlled at 200～600Nl/ minute, and the time is 1～2 minute;
Does 3) carrying out the soft blow purification (adopt anything to carry out soft blow?);
4) it is stand-by to cast steel billet.
The present invention is compared with prior art:
Reduced the silicone content in the product, promptly reducing to mean value by original average silicone content 3.5% is 1.8%, has significantly reduced the phenomenon that changes steel that causes because of siliceous height, has improved economic benefit; The Argon strong mixing has reduced the Al consumption to the loss of Als when having reduced the ladle furnace desulfurization.
Embodiment
Be described further below:
Embodiment 1
The control method of oxygen in a kind of low carbon low silicon aluminium killed steel, its step:
1) carries out hot metal pretreatment and steel-making;
2) carry out external refining:
A) in 3 minutes after refining begins, add aluminium for the first time according to kilogram/ton steel, wherein, add aluminum steel in molten steel, add-on accounts for this and adds 50% of aluminium gross weight; In slag, add aluminum shot, its add-on be this remaining 50%; And Argon stirring in molten steel simultaneously, the amount of being blown into was controlled at 1000Nl/ minute, and the time is 3 minutes;
B) when being refined to 20 minutes, carry out adding the second time aluminium according to kilogram/ton steel, wherein, in molten steel, add aluminum steel, add-on accounts for this and adds 50% of aluminium gross weight; In slag, add aluminum shot, its add-on be this remaining 50%; And continue Argon stirring in molten steel, and being blown into the argon amount and being controlled at 800Nl/ minute, the time is 10 minutes;
C) when being refined to 35 minutes,, then not carrying out this and add aluminium because the AlS in the molten steel reaches set(ting)value;
Does 3) carrying out the soft blow purification (adopt anything to carry out soft blow?);
4) it is stand-by to cast steel billet.
Embodiment 2
The control method of oxygen in a kind of low carbon low silicon aluminium killed steel, its step:
1) carries out hot metal pretreatment and steel-making;
2) carry out external refining:
A) during 5 minutes after refining begins, add aluminium for the first time according to kilogram/ton steel, wherein, add aluminum steel in molten steel, add-on accounts for this and adds 60% of aluminium gross weight; In slag, add aluminum shot, its add-on be this remaining 40%; And Argon stirring in molten steel simultaneously, the amount of being blown into was controlled at 900Nl/ minute, and the time is 4 minutes;
B) when being refined to 22 minutes, carry out adding the second time aluminium according to kilogram/ton steel, wherein, in molten steel, add aluminum steel, add-on accounts for this total 60% of aluminium amount that adds; Add aluminum shot in slag, its add-on is this residue 40%; And continue Argon stirring in molten steel, and being blown into the argon amount and being controlled at 950Nl/ minute, the time is 8 minutes;
C) when being refined to 38 minutes, because the AlS in the molten steel does not arrive set(ting)value, then add aluminium for the third time according to kilogram/ton steel, all be aluminum steel; Because the S content in the molten steel is at 85ppm, the Argon amount was controlled at 800Nl/ minute, and the time is 3 minutes;
Does 3) carrying out the soft blow purification (adopt anything to carry out soft blow?);
4) it is stand-by to cast steel billet.
Embodiment 3
The control method of oxygen in a kind of low carbon low silicon aluminium killed steel, its step:
1) carries out hot metal pretreatment and steel-making;
2) carry out external refining:
A) during 7 minutes after refining begins, add aluminium for the first time according to kilogram/ton steel, wherein, add aluminum steel in molten steel, add-on accounts for this and adds 75% of aluminium gross weight; In slag, add aluminum shot, its add-on be this remaining 25%; And Argon stirring in molten steel simultaneously, the amount of being blown into was controlled at 800Nl/ minute, and the time is 3.5 minutes;
B) when being refined to 26 minutes, carry out adding the second time aluminium according to kilogram/ton steel, wherein, in molten steel, add aluminum steel, add-on accounts for this total 65% of aluminium amount that adds; Add aluminum shot in slag, its add-on is this residue 35%; And continue Argon stirring in molten steel, and being blown into the argon amount and being controlled at 1050Nl/ minute, the time is 8 minutes;
C) when being refined to 45 minutes, because the AlS in the molten steel does not arrive set(ting)value, then add aluminium for the third time according to kilogram/ton steel, all be aluminum steel; Because the S content in the molten steel is at 120ppm, the Argon amount was controlled at 1000Nl/ minute, and the time is 1 minute;
Does 3) carrying out the soft blow purification (adopt anything to carry out soft blow?);
4) it is stand-by to cast steel billet.
Embodiment 4
The control method of oxygen in a kind of low carbon low silicon aluminium killed steel, its step:
1) carries out hot metal pretreatment and steel-making;
2) carry out external refining:
A) during 9 minutes after refining begins, add aluminium for the first time according to kilogram/ton steel, wherein, add aluminum steel in molten steel, add-on accounts for this and adds 90% of aluminium gross weight; In slag, add aluminum shot, its add-on be this remaining 10%; And Argon stirring in molten steel simultaneously, the amount of being blown into was controlled at 700Nl/ minute, and the time is 4 minutes;
B) when being refined to 28 minutes, carry out adding the second time aluminium according to kilogram/ton steel, wherein, in molten steel, add aluminum steel, add-on accounts for this total 70% of aluminium amount that adds; Add aluminum shot in slag, its add-on is this residue 30%; And continue Argon stirring in molten steel, and being blown into the argon amount and being controlled at 1200Nl/ minute, the time is 5 minutes;
C) when being refined to 40 minutes, because the AlS in the molten steel does not arrive set(ting)value, then add aluminium for the third time according to kilogram/ton steel, all be aluminum steel; Because the S content in the molten steel is at 50ppm, the Argon amount was controlled at 200Nl/ minute, and the time is 1 minute;
Does 3) carrying out the soft blow purification (adopt anything to carry out soft blow?);
4) it is stand-by to cast steel billet.
Embodiment 5
The control method of oxygen in a kind of low carbon low silicon aluminium killed steel, its step:
1) carries out hot metal pretreatment and steel-making;
2) carry out external refining:
A) during 9.5 minutes after refining begins, add aluminium for the first time according to kilogram/ton steel, wherein, add aluminum steel in molten steel, add-on accounts for this and adds 100% of aluminium gross weight; In slag, add aluminum shot, its add-on be this remaining 0%; And Argon stirring in molten steel simultaneously, the amount of being blown into was controlled at 600Nl/ minute, and the time is 5 minutes;
B) when being refined to 30 minutes, carry out adding the second time aluminium according to kilogram/ton steel, wherein, in molten steel, add aluminum steel, add-on accounts for this total 63% of aluminium amount that adds; Add aluminum shot in slag, its add-on is this residue 370%; And continue Argon stirring in molten steel, and being blown into the argon amount and being controlled at 1000Nl/ minute, the time is 5 minutes;
C) when being refined to 39 minutes, because the AlS in the molten steel does not arrive set(ting)value, then add aluminium for the third time according to kilogram/ton steel, all be aluminum steel; Because the S content in the molten steel is at 80ppm, the Argon amount was controlled at 600Nl/ minute, and the time is 2 minutes;
Does 3) carrying out the soft blow purification (adopt anything to carry out soft blow?);
4) it is stand-by to cast steel billet.
Xiao Sun:
Data among each embodiment are for disorderly filling out, and correction is! But be noted that each value bound preferably to appear as.
Claims (1)
1. the control method of oxygen in the low carbon low silicon aluminium killed steel, its step:
1) carries out hot metal pretreatment and steel-making;
2) carry out external refining:
A) in 10 minutes after refining begins, add aluminium for the first time according to kilogram/ton steel, wherein, add aluminum steel in molten steel, add-on accounts for this and adds 50～100% of aluminium gross weight; Add aluminum shot in slag, its add-on adds 0～50% of aluminium gross weight for this; And Argon stirring in molten steel simultaneously, the amount of being blown into was controlled at 600～1000Nl/ minute, and the time is 3～5 minutes;
B) be refined in 20～30 minutes, carrying out adding the second time aluminium according to kilogram/ton steel, wherein, adding aluminum steel in molten steel, add-on accounts for this and adds 50～70% of aluminium gross weight; Add aluminum shot in slag, its add-on adds 30～50% of gross weight for this; And continue Argon stirring in molten steel, and being blown into the argon amount and being controlled at 800～1200Nl/ minute, the time is 5～10 minutes;
C), when the AlS in the molten steel reaches set(ting)value, then no longer add aluminium being refined in 35～45 minutes; When AlS does not arrive set(ting)value, then add aluminium for the third time according to kilogram/ton steel, it all is an aluminum steel; And continue Argon and stir, when the S content in the steel during at 80～120ppm, the Argon amount was controlled at 800～1000Nl/ minute, and the time is 1～3 minute; When the S content in the steel during at 50～80ppm, the Argon amount was controlled at 200～600Nl/ minute, and the time is 1～2 minute;
Does 3) carrying out the soft blow purification (adopt anything to carry out soft blow?);
4) it is stand-by to cast steel billet.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101494645A CN102212650A (en) | 2011-06-03 | 2011-06-03 | Method for controlling oxygen in low-carbon low-silicon-aluminum (Al) killed steel |
| CN2012101362636A CN102732678A (en) | 2011-06-03 | 2012-05-04 | Control method of oxygen in low-carbon low-silicon aluminum-killed steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101494645A CN102212650A (en) | 2011-06-03 | 2011-06-03 | Method for controlling oxygen in low-carbon low-silicon-aluminum (Al) killed steel |
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| Publication Number | Publication Date |
|---|---|
| CN102212650A true CN102212650A (en) | 2011-10-12 |
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|---|---|---|---|
| CN2011101494645A Pending CN102212650A (en) | 2011-06-03 | 2011-06-03 | Method for controlling oxygen in low-carbon low-silicon-aluminum (Al) killed steel |
| CN2012101362636A Pending CN102732678A (en) | 2011-06-03 | 2012-05-04 | Control method of oxygen in low-carbon low-silicon aluminum-killed steel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102586546A (en) * | 2012-03-05 | 2012-07-18 | 吉林建龙钢铁有限责任公司 | Process for preparing low-carbon low-silicon-aluminium killed steel |
| CN102732678A (en) * | 2011-06-03 | 2012-10-17 | 武汉钢铁(集团)公司 | Control method of oxygen in low-carbon low-silicon aluminum-killed steel |
| CN103290171A (en) * | 2013-06-17 | 2013-09-11 | 河北省首钢迁安钢铁有限责任公司 | Aluminum adjustment process |
| CN110284046A (en) * | 2019-06-17 | 2019-09-27 | 首钢集团有限公司 | A kind of preparation process of automobile low density steel |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102212650A (en) * | 2011-06-03 | 2011-10-12 | 武汉钢铁(集团)公司 | Method for controlling oxygen in low-carbon low-silicon-aluminum (Al) killed steel |
-
2011
- 2011-06-03 CN CN2011101494645A patent/CN102212650A/en active Pending
-
2012
- 2012-05-04 CN CN2012101362636A patent/CN102732678A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732678A (en) * | 2011-06-03 | 2012-10-17 | 武汉钢铁(集团)公司 | Control method of oxygen in low-carbon low-silicon aluminum-killed steel |
| CN102586546A (en) * | 2012-03-05 | 2012-07-18 | 吉林建龙钢铁有限责任公司 | Process for preparing low-carbon low-silicon-aluminium killed steel |
| CN103290171A (en) * | 2013-06-17 | 2013-09-11 | 河北省首钢迁安钢铁有限责任公司 | Aluminum adjustment process |
| CN110284046A (en) * | 2019-06-17 | 2019-09-27 | 首钢集团有限公司 | A kind of preparation process of automobile low density steel |
| CN110284046B (en) * | 2019-06-17 | 2020-11-13 | 首钢集团有限公司 | A kind of preparation technology of low density steel for automobile |
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| Publication number | Publication date |
|---|---|
| CN102732678A (en) | 2012-10-17 |
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Application publication date: 20111012 |