CN105483501A - Method for smelting phosphorus-containing ultra-low carbon steel - Google Patents
Method for smelting phosphorus-containing ultra-low carbon steel Download PDFInfo
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Abstract
The invention provides a method for smelting phosphorus-containing ultra-low carbon steel. The method comprises the first step of pretreating molten iron, specifically, blowing desulphurizing powder into the molten iron to enable the S content to be less than or equal to 0.003wt%, the second step of conducting deoxygenation and decarburization in a converter, blowing oxygen for 15-18 min, adding slag making materials, conducting slag-stopping and steel tapping when the content of C in the molten steel is less than or equal to 0.06%, the content of O reaches 0.05-0.09%, and the temperature of the molten steel in the converter reaches 1680-1720 DEG C, and adding 2-5 kg/t lime through an argon station, the third step of carrying out ladle furnace (LF) refining, specifically, adding slag former into a steel ladle, carrying out bottom argon blowing and stirring, transferring the molten steel to carry out RH vacuum refining, decarburization and denitrification when the temperature of the molten steel reaches 1630-1650 DEG C, carrying out alloying in batches when the content of C in the steel is less than or equal to 0.0050wt%, carrying out still standing for 15-25 min and then continuous casting when the content of compositions and temperature reach the target content and temperature, blowing argon into spaces between plates at a long nozzle, a stopper rod, an upper nozzle and a submerged nozzle when pouring is conducted on a tundish, and adding carbon-free covering agents to protect pouring. By means of the method, the purity degree of the molten steel and the castability of the steel can be improved, nozzle clogging is effectively controlled, the smelting production efficiency and the steel quality are improved, consumption of spare parts is reduced, and the cost of per ton of steel is lowered.
Description
Technical field
The invention belongs to process for making field, particularly a kind of smelting process of phosphorous ultra low-carbon steel.
Background technology
RH vacuum metling ultra low-carbon steel (C≤0.0050%) technology is ripe day by day, along with the high development of automotive industry, has higher requirement to automobile ultra low-carbon steel, requires to have high strength and excellent deep drawability.In ultra low-carbon steel, strengthening element C content is low and be fixed, and thus usually adds strengthening element P and improves intensity, reach the requirement of high strength.
The smelting of phosphorous ultra low-carbon steel mainly solves decarburization, falls nitrogen, and purity control and microalloying eliminate the problem of C, N interstitial atom.Decarburization, the critical technological point falling nitrogen generally solve.Microalloying adds Ti and C, atom N, and form precipitate Ti (C, N), can eliminate interstitial atom, adding P can form substitutional solid solution, improves the tensile strength of ultra low-carbon steel, to reach the requirement of high strength.But it is the critical technological point smelting phosphorous ultra low-carbon steel that purity controls.When cast is containing Ti ultra low-carbon steel, produces dross in submerged nozzle, have a strong impact on production efficiency, quality product is worked the mischief simultaneously.And for containing Ti steel grade, increase P element wherein and nozzle clogging problem will be made more serious.
Summary of the invention
The invention provides a kind of smelting process of phosphorous ultra low-carbon steel, its object is to the Molten Steel Cleanliness by improving phosphorous ultra low-carbon steel, nozzle clogging in production control process, thus improve smelting production efficiency and steel.
For this reason, the solution that the present invention takes is:
A smelting process for phosphorous ultra low-carbon steel, its operational path is hot metal pretreatment-converter smelting-LF stove refining-RH vacuum refinement-continuous casting, and concrete grammar is:
Hot metal pretreatment: blowing desulfurization pulvis in molten iron, and it is clean to skim, when during S≤0.003wt%, molten iron being proceeded to converter smelting in molten iron.
Converter smelting: carry out deoxidation carbon drop in converter, oxygen blow duration is 15 ~ 18min; In molten steel, slag making materials is added in smelting process, when in molten steel, C≤0.06wt%, O reach 0.05 ~ 0.09wt%, and tap in ladle when in converter, liquid steel temperature reaches 1680 ~ 1720 DEG C, adopt Slag Retaining Process in tapping process, argon station adds 2 ~ 5kg/t lime.
LF stove refining: adopt the heating of electrode pair molten steel, add slag former simultaneously in ladle, with steel ladle bottom argon blowing, molten steel is stirred, the composition of even molten steel and temperature.When liquid steel temperature reaches 1630 ~ 1650 DEG C, proceed to vacuum refinement operation.
RH vacuum refinement: adopt the decarburization of RH vacuum cycle device, denitrogenation, when in steel during C≤0.0050wt%, alloying in batches, changes inclusion kind and quantity.After composition various in molten steel and temperature reach target value, leave standstill 15 ~ 25min, then molten steel is proceeded to continuous casting working procedure.
Continuous casting: when basket pouring, adopt blowing argon gas sealing in position between long nozzle, stopper, filling pipe end, soaking water gap plate, tundish adds carbon-free covering agent and carries out molding casting.
Beneficial effect of the present invention is:
The present invention can improve the Molten Steel Cleanliness of phosphorous ultra low-carbon steel, the castability of the phosphorous ultra low-carbon steel of remarkable improvement, make often to water time production stove number and bring up to 6 stoves by 4 stoves, nozzle clogging in effective production control process, improve and smelt production efficiency and steel, make 75 grades of ratios improve 50%, and can spare parts consumption be reduced, reduce ton steel cost, often water the secondary submerged nozzle usage quantity that often flows and be down to 1 by 2 ~ 3.
Embodiment
Embodiment 1: steel grade is: 210P1; Wherein P content is 0.08wt%, and C content is 0.0029wt%.
Hot metal pretreatment: adopt desulphurization spray gun to blowing magnesium base desulfurization powder in molten iron, CaO/Mg mass ratio is 4:1, and it is clean to skim, when during S≤0.003wt%, molten iron being proceeded to converter smelting in molten iron.
Converter smelting: carry out deoxidation carbon drop in converter, oxygen blow duration is 15min; In molten steel, add slag making materials in smelting process, as C0.04wt%, O0.06wt% in molten steel, and tap in ladle when liquid steel temperature reaches 1690 DEG C in converter, adopt Slag Retaining Process in tapping process, argon station adds 3.5kg/t lime.
LF stove refining: adopt the heating of electrode pair molten steel, add slag former lime 1t (260 tons of LF stoves) simultaneously in ladle, carries out modification to top slag, improves basicity.And with steel ladle bottom argon blowing, molten steel is stirred, when liquid steel temperature reaches 1640 DEG C, proceed to vacuum refinement operation.
RH vacuum refinement: adopt RH vacuum cycle device decarburization 12min, when in steel during C≤0.0050wt%, it is calm to add aluminum steel section; Add manganese alloy, silicon alloy after aluminium alloying 3min, after the 3min of interval, add niobium alloy and phosphorus alloy, after the 5min of interval, add titanium alloy again, after clean circulation 6min, close RH vacuum cycle device.After composition various in molten steel and temperature reach target value, leave standstill 20min, inclusion is fully floated, again molten steel is proceeded to continuous casting working procedure thereafter.
Continuous casting: when basket pouring, is blown into 6L/min argon gas-sealed to stopper, filling pipe end, and tundish adds 1kg/t carbon-free covering agent and carries out molding casting.
Embodiment 2:170P1; Wherein P content is 0.04wt%, and C content is 0.0020wt%.
Hot metal pretreatment: adopt desulphurization spray gun to blowing magnesium base desulfurization powder in molten iron, CaO/Mg mass ratio is 4:1, and it is clean to skim, when during S≤0.003wt%, molten iron being proceeded to converter smelting in molten iron.
Converter smelting: carry out deoxidation carbon drop in converter, oxygen blow duration is 18min; In molten steel, add slag making materials in smelting process, as C0.05wt%, O0.08wt% in molten steel, and tap in ladle when liquid steel temperature reaches 1710 DEG C in converter, adopt Slag Retaining Process in tapping process, argon station adds 3kg/t lime.
LF stove refining: adopt the heating of electrode pair molten steel, add slag former lime 1t (260 tons of LF stoves) simultaneously in ladle, carries out modification to top slag, improves basicity.And with steel ladle bottom argon blowing, molten steel is stirred, when liquid steel temperature reaches 1630 DEG C, proceed to vacuum refinement operation.
RH vacuum refinement: adopt RH vacuum cycle device decarburization 12min, when in steel during C≤0.0050wt%, it is calm to add aluminum steel section; Add manganese alloy, silicon alloy after aluminium alloying 3min, after the 3min of interval, add niobium alloy and phosphorus alloy, after the 5min of interval, add titanium alloy again, after clean circulation 6min, close RH vacuum cycle device.After composition various in molten steel and temperature reach target value, leave standstill 25min, inclusion is fully floated, again molten steel is proceeded to continuous casting working procedure thereafter.
Continuous casting: when basket pouring, is blown into 5L/min argon gas-sealed between long nozzle, stopper, filling pipe end, soaking water gap plate, and tundish adds 1kg/t carbon-free covering agent and carries out molding casting.
Claims (1)
1. a smelting process for phosphorous ultra low-carbon steel, is characterized in that:
Hot metal pretreatment: blowing desulfurization pulvis in molten iron, and it is clean to skim, when during S≤0.003wt%, molten iron being proceeded to converter smelting in molten iron;
Converter smelting: carry out deoxidation carbon drop in converter, oxygen blow duration is 15 ~ 18min; In molten steel, slag making materials is added in smelting process, when in molten steel, C≤0.06wt%, O reach 0.05 ~ 0.09wt%, and tap in ladle when in converter, liquid steel temperature reaches 1680 ~ 1720 DEG C, adopt Slag Retaining Process in tapping process, argon station adds 2 ~ 5kg/t lime;
LF stove refining: adopt the heating of electrode pair molten steel, add slag former simultaneously in ladle, with steel ladle bottom argon blowing, molten steel is stirred, when liquid steel temperature reaches 1630 ~ 1650 DEG C, proceed to vacuum refinement operation;
RH vacuum refinement: adopt the decarburization of RH vacuum cycle device, denitrogenation, when in steel during C≤0.0050wt%, alloying in batches; After composition various in molten steel and temperature reach target value, leave standstill 15 ~ 25min, then molten steel is proceeded to continuous casting working procedure;
Continuous casting: when basket pouring, adopt blowing argon gas sealing in position between long nozzle, stopper, filling pipe end, soaking water gap plate, tundish adds carbon-free covering agent and carries out molding casting.
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| CN201410483658.2A CN105483501A (en) | 2014-09-19 | 2014-09-19 | Method for smelting phosphorus-containing ultra-low carbon steel |
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| CN201410483658.2A CN105483501A (en) | 2014-09-19 | 2014-09-19 | Method for smelting phosphorus-containing ultra-low carbon steel |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107365884A (en) * | 2016-05-12 | 2017-11-21 | 鞍钢股份有限公司 | A kind of method of ultra-low-carbon steel carbon component close limit control |
| CN107365890A (en) * | 2016-05-12 | 2017-11-21 | 鞍钢股份有限公司 | A kind of control method of X80 inclusion in pipeline steel |
| CN108866276A (en) * | 2018-07-26 | 2018-11-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Improve the smelting process of heavy rail steel cleanness |
| CN109666854A (en) * | 2019-01-15 | 2019-04-23 | 舞阳钢铁有限责任公司 | A kind of smelting process of mild steel |
| CN110484808A (en) * | 2019-09-04 | 2019-11-22 | 鞍钢股份有限公司 | A method of improving phosphorous ultra-low-carbon steel castability |
| CN111545718A (en) * | 2020-05-11 | 2020-08-18 | 首钢集团有限公司 | Method and device for blowing argon in slab continuous casting |
| CN111621622A (en) * | 2020-06-09 | 2020-09-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting method of high-cleanliness steel |
| CN114807731A (en) * | 2022-05-20 | 2022-07-29 | 山东钢铁集团日照有限公司 | Smelting method of steel grade with ultra-low carbon and large silicon-manganese alloy amount |
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| JPH05230516A (en) * | 1992-02-19 | 1993-09-07 | Kawasaki Steel Corp | Melting method for extra-low-carbon steel |
| JP2004238698A (en) * | 2003-02-07 | 2004-08-26 | Nisshin Steel Co Ltd | Production method of high cleanliness steel |
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| CN103451349A (en) * | 2013-08-16 | 2013-12-18 | 河北钢铁股份有限公司邯郸分公司 | Control method for preventing nozzle clogging in casting process of ultra-low carbon-aluminium deoxidized molten steel |
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2014
- 2014-09-19 CN CN201410483658.2A patent/CN105483501A/en active Pending
Patent Citations (6)
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| JPH05230516A (en) * | 1992-02-19 | 1993-09-07 | Kawasaki Steel Corp | Melting method for extra-low-carbon steel |
| JP2004238698A (en) * | 2003-02-07 | 2004-08-26 | Nisshin Steel Co Ltd | Production method of high cleanliness steel |
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| CN103451349A (en) * | 2013-08-16 | 2013-12-18 | 河北钢铁股份有限公司邯郸分公司 | Control method for preventing nozzle clogging in casting process of ultra-low carbon-aluminium deoxidized molten steel |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107365884A (en) * | 2016-05-12 | 2017-11-21 | 鞍钢股份有限公司 | A kind of method of ultra-low-carbon steel carbon component close limit control |
| CN107365890A (en) * | 2016-05-12 | 2017-11-21 | 鞍钢股份有限公司 | A kind of control method of X80 inclusion in pipeline steel |
| CN108866276A (en) * | 2018-07-26 | 2018-11-23 | 攀钢集团攀枝花钢铁研究院有限公司 | Improve the smelting process of heavy rail steel cleanness |
| CN109666854A (en) * | 2019-01-15 | 2019-04-23 | 舞阳钢铁有限责任公司 | A kind of smelting process of mild steel |
| CN110484808A (en) * | 2019-09-04 | 2019-11-22 | 鞍钢股份有限公司 | A method of improving phosphorous ultra-low-carbon steel castability |
| CN111545718A (en) * | 2020-05-11 | 2020-08-18 | 首钢集团有限公司 | Method and device for blowing argon in slab continuous casting |
| CN111545718B (en) * | 2020-05-11 | 2022-04-19 | 首钢集团有限公司 | Method and device for blowing argon in slab continuous casting |
| CN111621622A (en) * | 2020-06-09 | 2020-09-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting method of high-cleanliness steel |
| CN114807731A (en) * | 2022-05-20 | 2022-07-29 | 山东钢铁集团日照有限公司 | Smelting method of steel grade with ultra-low carbon and large silicon-manganese alloy amount |
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Application publication date: 20160413 |