CN103255259A - Method of controlling molten steel pourability under condition of calcium-free treatment - Google Patents
Method of controlling molten steel pourability under condition of calcium-free treatment Download PDFInfo
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- CN103255259A CN103255259A CN2013101659524A CN201310165952A CN103255259A CN 103255259 A CN103255259 A CN 103255259A CN 2013101659524 A CN2013101659524 A CN 2013101659524A CN 201310165952 A CN201310165952 A CN 201310165952A CN 103255259 A CN103255259 A CN 103255259A
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Abstract
The invention provides a method of controlling molten steel pourability under the condition of calcium-free treatment. The method comprises the steps of: (1) carrying out pre-deoxidation before entering an LF (Ladle) furnace, ensuring end point carbon of a converter to be no more than 0.30 percent by virtue of a converter catching carbon technology, adding 2.5Kg of ferro-manganese-aluminum in the process from steel tapping to a steel ladle, and removing at least 95 percent of free oxygen in the molten steel; (2) rapidly producing white slags by virtue of the LF furnace, and ensuring the keeping time of the white slags to be no less than 12minutes; (3) carrying out LF furnace argon blowing-electrifying intelligent control, and intelligently controlling an LF furnace bottom blowing rate by phases and heating powers; and (4) carrying out argon blowing control by phases by virtue of a VD (Vacuum Ladle) furnace. With the adoption of the control method, the amount of molten steel continuous casting furnaces capable of treating without calcium reaches 45, and non-planned nozzle change due to poor molten steel mobility which is caused by reasons of steel breakout, nozzle clogging and the like does not exist.
Description
Technical field
The invention belongs to the converter steelmaking field, be specifically related to a kind of method of controlling watering property of molten steel under the no calcium treatment condition.
Background technology
Experimental study result in recent years generally believes, crisp clevis foreign material (Si, Al and contain the nitride of Ti) are big to the contact fatigue life influence of bearing.Sweden Aktiebolaget SKF once pointed out: the effect of calcium aluminate ratio aluminum oxide is worse in the oxide compound.Therefore be mingled with the bearing steel Fatigue Life in order to reduce the calcium aluminate class, this just requires to carry out calcium to molten steel and handles.
What Laiwu iron and steel special steel division department taked in the production technique of bearing steel is no calcium treatment process, but the continous casting sprue dross often takes place in casting cycle, be unable to lift pulling rate, molten steel is in problems such as casting process mouth of a river Mao Gang, cause the replacing mouth of a river frequent, the mouth of a river is burnt an eye phenomenon and is taken place often, and it is many to cause the mouth of a river to change quantity, get rid of base in a large number, influence continuous casting production efficiency greatly.
At present domestic excellent special steel manufacturer molten steel connects and draws the stove number in 20 stoves, improves to connect and draws the stove number significant to guaranteeing that continuous casting production is carried out smoothly.
Summary of the invention
For overcoming the deficiency of above technology, the invention provides a kind of control method of not having watering property of molten steel under the calcium treatment condition, avoid occurring emitting reasons such as steel, cover eye to cause that fluidity molten steel is bad and cause the unplanned phenomenon such as the mouth of a river of changing.
This method comprises:
1) advances the pre-deoxidation before of LF stove, guarantee that by the high catch carbon of converter converter terminal carbon is not less than 0.30%; And deoxidation alloying;
Preferably, described deoxidation alloying process is included in taps that steel per ton adds 2.5Kg aluminium ferromanganese to the process of ladle, to remove in the molten steel at least 95% free oxygen;
Preferably, top and bottom combined blown converter adopts high catch carbon technology, opens to blow and oxygen press to use as follows, open and blow 1400～1500mm, early stage, foamy slag got up, and the rifle position is to pressing down 100mm～150mm, and 4～5 minutes reaction between carbon and oxygen phases began, progressively carry rifle to 1600～1800mmm, disposable after 8 minutes the rifle position is carried to 1900～2000mm, adopted dynamic rifle position afterwards, be i.e. rifle position alternatively up and down change between 1700mm～1900mm, the half-open beginning was pressed rifle to 12 minutes, slowly pressed rifle to 1200～1300mm.Bottom blowing intensity is 0.050Nm3/t.min in earlier stage, mid-term 0.036Nm3/t.min, later stage 0.035Nm3/t.min.The assurance bottom blowing is respond well, is not less than 0.30% to guarantee end point carbon.
Described converter operation deoxidation alloying process comprises: see that steel stream adds the amount of aluminium ferromanganese 1kg/t steel earlier, increase manganese, Gao Ge, middle manganese, middle chromium, silicomanganese, ferro-silicon thereafter successively, add and add residual Al ferromanganese in the alloy process, all add before the alloy pushing off the slag.
2) the LF stove is made white slag fast, guarantees white slag hold-time 〉=12 minute;
LF stove energising adds the amount of silicon carbide reductor 0.5Kg/t steel after 1 minute, switch on 3 minutes according to after finish the slag anticipation, assurance white slag hold-time 〉=12 minute.
3) LF stove Argon-energising intelligent control technology, stage by stage, divide heating power control intelligent control LF furnace bottom wind drift amount;
4) VD stove Argon stage by stage;
Preferably, VD stove Argon process stage by stage comprises: the VD stove evacuation is during the stage, and the control argon flow amount is 30～40NL/min; VD stove vacuum pressurize 0～5 minute, the control argon flow amount is 60～80NL/min; VD stove vacuum pressurize 5～10 minutes, the control argon flow amount is 200NL/min; VD stove vacuum pressurize 10～15 minutes, the control argon flow amount is 60～80NL/min; The broken empty back soft blow of VD 15～20 minutes, the control argon flow amount is 8～10NL/min.
Preferably, control intelligent control LF furnace bottom wind drift amount by heating power.
Preferred, as shown in table 1, heating power and argon flow amount have following relation:
The intelligent argon blowing rate correspondence table of table 1
Preferably, described method also comprises the steps:
5) no calcium is handled the Application and Development of slag slag system.
Calcium is handled the Application and Development of slag slag system, is tapping to the process of ladle, with the amount of 0.5kg/t steel～1.0kg/t steel pre-melt is added molten steel.
In furnaceman's LF order, the amount according to the 10kg/t steel before the energising heating adds lime, slag supplying agent 200Kg/t.
FeO weight content and the MnO weight content sum of the slag of control LF stove-special-purpose slag system of VD are no more than 1.0%, CaO content: 50～55%, SiO
2Content: 8～12%, Al
2O
3Content: 15～18%, basicity of slag R:4～5.
The present invention realizes that the molten steel that does not have the calcium processing even draws the stove number can reach 45 stoves, does not have reasons such as emitting steel, cover eye and causes the bad unplanned mouth of a river of changing of causing of fluidity molten steel, has improved production efficiency greatly.
Embodiment
The present invention is described in further detail below in conjunction with example, and it is only as explanation of the invention rather than restriction.
The control method of watering property of molten steel under a kind of no calcium treatment condition of the GCr15 of smelting steel comprises:
1) top and bottom combined blown converter adopts high catch carbon technology, open and blow and oxygen press to use as follows: open and blow 1400～1500mm, early stage, foamy slag got up, and the oxygen lance position is to pressing down 100mm～150mm, and 4～5 minutes reaction between carbon and oxygen phases began, progressively carry rifle to 1600～1800mmm, disposable after 8 minutes the rifle position is carried to 1900～2000mm, adopted dynamic rifle position afterwards, be i.e. rifle position alternatively up and down change between 1700mm～1900mm, the half-open beginning was pressed rifle to 12 minutes, slowly pressed rifle to 1200～1300mm.Bottom blowing intensity is 0.050Nm3/t.min in earlier stage, mid-term 0.036Nm3/t.min, later stage 0.035Nm3/t.min.The assurance bottom blowing is respond well, is not less than 0.30% to guarantee end point carbon.
Add the aluminium ferromanganese of 2.5Kg/t steel to the process of ladle tapping, to remove in the molten steel at least 95% free oxygen, see that steel stream adds 100kg aluminium ferromanganese earlier, successively increase manganese, Gao Ge, middle manganese, middle chromium, silicomanganese, ferro-silicon thereafter, add and add residual Al ferromanganese in the alloy process, all add before the alloy pushing off the slag.Amount with 1.0kg/t steel-1.5kg/t steel adds molten steel with pre-melt in the converter tapping process simultaneously.Pre-melt contains 47.5% CaO, 36.3% Al
2O
3, 3.5% MgO, be no more than 1.5% Fe
2O
3, be no more than 4% SiO
2, total amount is no more than 0.02% P and S, is no more than 0.5% moisture, and unavoidable impurities.
2) in furnaceman's LF order, the amount according to the 10kg/t steel before the energising heating adds lime, deoxidation promotor 2.5Kg/t steel.(deoxidation promotor is contained 15% Al, 50% Al
2O
3, 6% MgO is no more than 1.5% Fe
2O
3, be no more than 6% SiO
2, total amount is no more than 0.02% P and S, is no more than 0.5% moisture, and unavoidable impurities.) begin the temperature raising slag of switching on then, switch on and added silicon carbide reductor 30Kg/ stove in 1 minute afterwards, after switching on 3 minutes, finish the slag anticipation, add carbide of calcium to the LF stove in batches, make the light current rock ballast, guarantee refining slag (FeO+MnO) %≤0.5%, guarantee white slag hold-time 〉=12 minute, add lime 1.0kg/t steel after having got first sample, be 4.0-5.0 with this basicity of controlling refining slag, and adjust slag viscosity with this.
3) adopt big electric current temperature raising, big voltage slag principle.Aborning, when inlet temperature is higher, switch on after 1 minute, adopt electric current: 22000-26000A, voltage: 5 retainings, rapid slag; When inlet temperature is normal or on the low side, adopt electric current: 28000-30000A, voltage: 4-5 retaining, the big quick temperature raising slag of the big voltage of electric current; Middle and later periods is adopted electric current: 8000-12000A, and voltage: 6-8 retaining is incubated operation.Be not less than conduction time 18 minutes.
4) in furnaceman's VD order, VD stove evacuation stage, argon flow amount 30～40NL/min; VD stove vacuum pressurize 0～5 minute, argon flow amount 60～80NL/min; VD stove vacuum pressurize 5～10 minutes, argon flow amount 200NL/min; VD stove vacuum pressurize 10～15 minutes, argon flow amount 60～80NL/min, the broken empty back soft blow of VD 15～20 minutes, argon flow amount 8～10NL/min.
Above example can illustrate, the present invention can realize that molten steel connects and draw several 45 stoves of stove, do not have reasons such as emitting steel, cover eye and causes that fluidity molten steel is bad and cause the unplanned mouth of a river of changing.
Claims (11)
1. method of controlling watering property of molten steel under the no calcium treatment condition comprises:
1) advance the pre-deoxidation before of LF stove, guarantee that by the high catch carbon of top and bottom combined blown converter converter terminal carbon is not less than 0.30%, and deoxidation alloying;
2) the LF stove is made white slag fast, guarantees white slag hold-time 〉=12 minute;
3) stage by stage, divide heating power control LF furnace bottom wind drift amount;
4) VD stove Argon stage by stage.
2. method according to claim 1 is characterized in that, in the high catch carbon process of described step 1) top and bottom combined blown converter, bottom blowing intensity is 0.050Nm in earlier stage
3/ t.min, be 0.036Nm mid-term
3/ t.min, the later stage is 0.035Nm
3/ t.min.
3. method according to claim 1 and 2, it is characterized in that, the high catch carbon process of described step 1) top and bottom combined blown converter adopts the high rifle bit pattern of height, open and blow 1400～1500mm, after early stage, foamy slag got up, the rifle position is to pressing down 100mm～150mm, 4～5 minutes reaction between carbon and oxygen phases began, progressively carry rifle to 1600～1800mmm, disposable after 8 minutes the rifle position is carried to 1900～2000mm, adopted dynamic rifle position afterwards, the rifle position is the alternatively up and down change between 1700mm～1900mm, the half-open beginning was pressed rifle to 12 minutes, slowly pressed rifle to 1200～1300mm.
4. method according to claim 1 is characterized in that, the deoxidation alloying process in the described step 1) is included in taps that steel per ton adds 2.5Kg aluminium ferromanganese to the process of ladle.
5. according to claim 1 or 4 described methods, it is characterized in that, deoxidation alloying process in the described step 1) comprises: see that steel stream adds aluminium ferromanganese earlier, add-on is the amount of 1kg/t steel, successively increase manganese, Gao Ge, middle manganese, middle chromium, silicomanganese, ferro-silicon thereafter, add and add aluminium ferromanganese in the alloy process, add-on is the amount of 1.5kg/t steel, all adds before the alloy pushing off the slag.
6. method according to claim 1 is characterized in that, LF stove energising added the silicon carbide reductor after 1 minute in the described step 1), and add-on is the amount of 0.5Kg/t steel, guarantees white slag hold-time 〉=12 minute.
7. method according to claim 1 is characterized in that, described step 4) comprises: the VD stove evacuation is during the stage, and the control argon flow amount is 30～40NL/min; VD stove vacuum pressurize 0～5 minute, the control argon flow amount is 60～80NL/min; VD stove vacuum pressurize 5～10 minutes, the control argon flow amount is 200NL/min; VD stove vacuum pressurize 10～15 minutes, control argon flow amount 60～80 is NL/min; The broken empty back soft blow of VD 15～20 minutes, the control argon flow amount is 8～10NL/min.
8. according to claim 1 or 7 described methods, it is characterized in that described step 4) also comprises by heating power controls LF furnace bottom wind drift amount.
9. method according to claim 1 is characterized in that, behind the described step 1) deoxidation alloying, is tapping to the process of ladle, with the amount of 0.5kg/t steel～1.0kg/t steel pre-melt is added molten steel.
10. method according to claim 1 is characterized in that, described method also is included in step 2) in, the amount according to the 10kg/t steel before the LF stove energising heating adds lime, slag supplying agent 2.5Kg/t.
11. method according to claim 1 is characterized in that, described method comprises that also FeO weight content and the MnO weight content sum of control LF stove and VD slag are no more than 1.0%, CaO content: 50～55%, SiO
2Content: 8～12%, Al
2O3 content: 15～18%, basicity of slag R:4～5.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104212935A (en) * | 2014-08-22 | 2014-12-17 | 山东西王特钢有限公司 | Method for producing high-grade GCr15 bearing steel by using high-titanium chrome iron |
| CN106282473A (en) * | 2015-05-27 | 2017-01-04 | 鞍钢股份有限公司 | A kind of small billet low-silicon steel anti-wadding stream method |
| CN108796348A (en) * | 2018-06-08 | 2018-11-13 | 河钢股份有限公司 | A kind of smelting process of high-carbon aluminum killed steel |
| CN111424204A (en) * | 2018-01-31 | 2020-07-17 | 日照钢铁控股集团有限公司 | Production process of calcium-treatment-free low-carbon silicon-containing killed clean steel |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104212935A (en) * | 2014-08-22 | 2014-12-17 | 山东西王特钢有限公司 | Method for producing high-grade GCr15 bearing steel by using high-titanium chrome iron |
| CN104212935B (en) * | 2014-08-22 | 2016-03-16 | 山东西王特钢有限公司 | A kind of method with high titanium ferrochrome production high-quality GCr15 bearing steel |
| CN106282473A (en) * | 2015-05-27 | 2017-01-04 | 鞍钢股份有限公司 | A kind of small billet low-silicon steel anti-wadding stream method |
| CN106282473B (en) * | 2015-05-27 | 2018-06-26 | 鞍钢股份有限公司 | A kind of anti-wadding stream method of small billet low-silicon steel |
| CN111424204A (en) * | 2018-01-31 | 2020-07-17 | 日照钢铁控股集团有限公司 | Production process of calcium-treatment-free low-carbon silicon-containing killed clean steel |
| CN111424204B (en) * | 2018-01-31 | 2021-03-19 | 日照钢铁控股集团有限公司 | Production process of calcium-treatment-free low-carbon silicon-containing killed clean steel |
| CN108796348A (en) * | 2018-06-08 | 2018-11-13 | 河钢股份有限公司 | A kind of smelting process of high-carbon aluminum killed steel |
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