CN103966400A - Method for dephosphorizing by using RH refining furnace - Google Patents
Method for dephosphorizing by using RH refining furnace Download PDFInfo
- Publication number
- CN103966400A CN103966400A CN201410161471.0A CN201410161471A CN103966400A CN 103966400 A CN103966400 A CN 103966400A CN 201410161471 A CN201410161471 A CN 201410161471A CN 103966400 A CN103966400 A CN 103966400A
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- CN
- China
- Prior art keywords
- oxygen
- station
- phosphorus content
- steel
- refining furnace
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- 238000007670 refining Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 49
- 239000010959 steel Substances 0.000 claims abstract description 49
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000001301 oxygen Substances 0.000 claims abstract description 40
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 40
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 38
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 23
- 239000011574 phosphorus Substances 0.000 claims abstract description 23
- 229910052786 argon Inorganic materials 0.000 claims abstract description 19
- 239000002893 slag Substances 0.000 claims abstract description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 13
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 13
- 238000007664 blowing Methods 0.000 claims abstract description 13
- 238000005261 decarburization Methods 0.000 claims abstract description 13
- 239000004571 lime Substances 0.000 claims abstract description 13
- 238000005275 alloying Methods 0.000 claims abstract description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 239000008187 granular material Substances 0.000 description 4
- 238000009533 lab test Methods 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical compound [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to the field of ferrous metallurgy, in particular to a method for dephosphorizing by using an RH refining furnace, which comprises the following specific operation steps of carrying out dephosphorization treatment by using the RH refining furnace aiming at a tank time with the phosphorus content of more than 0.010 percent and less than or equal to 0.015 percent in an argon station, wherein the phosphorus content of the treated tank time is less than or equal to 0.010 percent: 1) moving the molten steel to an RH refining furnace, after the molten steel is lifted to the proper position, measuring the temperature and determining the oxygen, starting a pump and vacuumizing; 2) adding lime and fluxing slag according to the phosphorus content in the argon station; 3) after circulating for 3-6 min, determining oxygen blowing amount according to the station entering oxygen setting value; 4) and after oxygen blowing is finished and molten steel is circulated for 2-4 min, measuring the temperature and determining the oxygen to take a decarburization initial sample, and then carrying out conventional refining operations of deep decarburization and alloying. Compared with the prior art, the invention has the beneficial effects that: by adopting the technical scheme under the vacuum condition, the dephosphorization is realized, the product quality is ensured, and the process route or steel change is avoided.
Description
Technical field
The present invention relates to ferrous metallurgy field, relate in particular to a kind of method of the RH of utilization refining furnace dephosphorization.
Background technology
Produce at present IF steel and generally adopt hot metal pretreatment-converter-vacuum-continuous casting process, produce by " IF steel Operating Guideline ".But there are some steel grades, the steel grade phosphorus contents such as such as M3A33 are less than 0.010%, converter is because molten iron phosphorus is high or it is bad to change slag, and argon station phosphorus is often greater than 0.010%, if this tank molten steel handling is processed to LF, affect rhythm of production, easily occurring breaks waters accident, ensures again quality product, while producing this class steel grade in order to protect production direct motion, if the super finished product of phosphorus content, reduces molten steel phosphorus content in RH employing measure.
Summary of the invention
The object of this invention is to provide a kind of method of the RH of utilization refining furnace dephosphorization, avoid causing because phosphorus is high steel grade degradation or change steel, control quality risk.
For achieving the above object, the present invention is achieved through the following technical solutions:
Utilize a method for RH refining furnace dephosphorization, be greater than 0.010% be less than or equal to 0.015% tank for argon station phosphorus content, utilize RH refining furnace to carry out dephosphorization treatment, after processing, phosphorus content is less than or equal to 0.010%, and its concrete operation step is as follows:
1) molten steel is moved to RH refining furnace, molten steel and top is raised to behind position, and thermometric is determined oxygen, opens pump and vacuumizes;
2) when three, after level Four vacuum pump opens, add lime and fluxing slag according to argon station phosphorus content, wherein argon station phosphorus content is in 0.0101%～0.0129% scope, and lime adding amount is 1.6～2.4kg/t steel, and fluxing slag add-on is 0.32～0.6kg/t steel; Wherein phosphorus content argon station, argon station phosphorus content is in 0.0130%～0.0159% scope, and lime adding amount is 3.2～4kg/t steel, and fluxing slag add-on is 0.64～0.8kg/t steel;
3) add after lime and fluxing slag, after circulation 3～6min, determine oxygen value determine blowing oxygen quantity according to entering the station, wherein enter the station oxygen value within the scope of 350～500ppm, blowing oxygen quantity is 70～90Nm
3; Wherein enter the station oxygen value within the scope of 501～700ppm, and blowing oxygen quantity is 30～60Nm
3; The oxygen value > 701ppm that wherein enters the station, blowing oxygen quantity is 0;
4) oxygen blast finishes, and after molten steel circulation 2～4min, thermometric is determined oxygen and got the initial sample of decarburization, carries out subsequently conventional dark decarburization, the refining operation of alloying.
Main component in described fluxing slag (Wt%) is: Al
2o
340～50, SiO
215～30, CaO≤15, MgO≤5, FeO≤2.
Compared with prior art, beneficial effect of the present invention is:
By adopt technical scheme under vacuum condition, realize dephosphorization, ensure quality product, avoid the generation that changes operational path or change steel.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described:
Embodiment 1
With 250 tons of RH refining furnaces, producing steel grade M3A33 is example, and steel grade requires P≤0.010%, if argon station phosphorus 0.013% exceeds steel grade requirement, molten steel is moved to RH stove, molten steel and top is raised to behind position, thermometric is determined oxygen, 1615 DEG C of temperature, oxygen 565ppm, opens pump and vacuumizes, when three, after level Four vacuum pump opens, add lime granule 800kg, fluxing slag 160kg, after circulation 4min, oxygen blast 50Nm
3, after molten steel circulation 2min, thermometric is determined oxygen and is got the initial sample of decarburization.Carry out subsequently the refining operation of conventional alloying, dark decarburization:
1) if temperature value+[O] ppm × 0.04<1615, RH stove alumina heats up, alumina is than 1:1,7.5Nm
3oxygen heats up 1 DEG C; If temperature value+[O] ppm × 0.04 > 1615, does not need to heat up;
2) lift gas flow control: three, before the unlatching of level Four vacuum pump, argon blowing rate is 100～120Nm
3/ h, three, level Four vacuum pump open after argon blowing rate be 140～150Nm
3/ h, it is 110～130Nm that alloying finishes rear argon blowing rate
3/ h;
3) after dark decarburization finishes, add deoxidized aluminium and composition aluminium, after circulation 3～5min, add alloy, the 8～10min that only circulates is broken empty.Last molten steel result of laboratory test P0.009%, meets product requirement.
Embodiment 2
With 250 tons of RH refining furnaces, producing steel grade M3A35 is example, and steel grade requires P≤0.010%, if argon station phosphorus 0.012% exceeds steel grade requirement, molten steel is moved to RH, molten steel and top is raised to behind position, thermometric is determined oxygen, 1625 DEG C of temperature, oxygen 615ppm, opens pump and vacuumizes, when three, after level Four vacuum pump opens, add lime granule 500kg, fluxing slag 100kg, after circulation 6min, oxygen blast 40Nm
3, after molten steel circulation 3min, thermometric is determined oxygen and is got the initial sample of decarburization.Carry out subsequently conventional dark decarburization, the refining operation of alloying, with embodiment 1, last molten steel result of laboratory test P0.008%, meets product requirement.
Embodiment 3
With 250 tons of RH refining furnaces, producing steel grade ADC is example, and steel grade requires P≤0.010%, if argon station phosphorus 0.015% exceeds steel grade requirement, molten steel is moved to RH, molten steel and top is raised to behind position, thermometric is determined oxygen, 1616 DEG C of temperature, oxygen 615ppm, opens pump and vacuumizes, when three, after level Four vacuum pump opens, add lime granule 900kg, fluxing slag 180kg, after circulation 4min, oxygen blast 60Nm
3, after molten steel circulation 4min, thermometric is determined oxygen and is got the initial sample of decarburization.Carry out subsequently conventional dark decarburization, the refining operation of alloying, with embodiment 1, last molten steel result of laboratory test P0.010%, meets product requirement.
In above-described embodiment, main component in fluxing slag (Wt%) is: Al
2o
340～50, SiO
215～30, CaO≤15, MgO≤5, FeO≤2.The granularity of lime granule is 5～10mm, and CaO content is >=88%.
Claims (2)
1. a method of utilizing RH refining furnace dephosphorization, is characterized in that, is greater than 0.010% is less than or equal to 0.015% tank for argon station phosphorus content, utilizes RH refining furnace to carry out dephosphorization treatment, and after processing, phosphorus content is less than or equal to 0.010%, and its concrete operation step is as follows:
1) molten steel is moved to RH refining furnace, molten steel and top is raised to behind position, and thermometric is determined oxygen, opens pump and vacuumizes;
2) when three, after level Four vacuum pump opens, add lime and fluxing slag according to argon station phosphorus content, wherein argon station phosphorus content is in 0.0101%～0.0129% scope, and lime adding amount is 1.6～2.4kg/t steel, and fluxing slag add-on is 0.32～0.6kg/t steel; Wherein phosphorus content argon station, argon station phosphorus content is in 0.0130%～0.0159% scope, and lime adding amount is 3.2～4kg/t steel, and fluxing slag add-on is 0.64～0.8kg/t steel;
3) add after lime and fluxing slag, after circulation 3～6min, determine oxygen value determine blowing oxygen quantity according to entering the station, wherein enter the station oxygen value within the scope of 350～500ppm, blowing oxygen quantity is 70～90Nm
3; Wherein enter the station oxygen value within the scope of 501～700ppm, and blowing oxygen quantity is 30～60Nm
3; The oxygen value > 701ppm that wherein enters the station, blowing oxygen quantity is 0;
4) oxygen blast finishes, and after molten steel circulation 2～4min, thermometric is determined oxygen and got the initial sample of decarburization, carries out subsequently conventional dark decarburization, the refining operation of alloying.
2. a kind of method of utilizing RH refining furnace dephosphorization according to claim 1, is characterized in that, main component in described fluxing slag (Wt%) is: Al
2o
340～50, SiO
215～30, CaO≤15, MgO≤5, FeO≤2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410161471.0A CN103966400A (en) | 2014-04-21 | 2014-04-21 | Method for dephosphorizing by using RH refining furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410161471.0A CN103966400A (en) | 2014-04-21 | 2014-04-21 | Method for dephosphorizing by using RH refining furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103966400A true CN103966400A (en) | 2014-08-06 |
Family
ID=51236400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410161471.0A Pending CN103966400A (en) | 2014-04-21 | 2014-04-21 | Method for dephosphorizing by using RH refining furnace |
Country Status (1)
| Country | Link |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1291657A (en) * | 1999-10-08 | 2001-04-18 | 鞍山钢铁集团公司 | Flux and process for forming slag of converter |
| CN1350594A (en) * | 1999-05-07 | 2002-05-22 | 西德玛公司 | Method of decarburisation and dephosphorisation of a molten metal |
-
2014
- 2014-04-21 CN CN201410161471.0A patent/CN103966400A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1350594A (en) * | 1999-05-07 | 2002-05-22 | 西德玛公司 | Method of decarburisation and dephosphorisation of a molten metal |
| CN1291657A (en) * | 1999-10-08 | 2001-04-18 | 鞍山钢铁集团公司 | Flux and process for forming slag of converter |
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