CN106636531B - A kind of combined blown converter smelts double slag techniques of ultralow phosphorus mild steel - Google Patents
A kind of combined blown converter smelts double slag techniques of ultralow phosphorus mild steel Download PDFInfo
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- CN106636531B CN106636531B CN201611007447.7A CN201611007447A CN106636531B CN 106636531 B CN106636531 B CN 106636531B CN 201611007447 A CN201611007447 A CN 201611007447A CN 106636531 B CN106636531 B CN 106636531B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
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- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention is double slag techniques that a kind of combined blown converter smelts ultralow phosphorus mild steel, including：(i) molten iron and steel scrap are packed into converter according to hot metal ratio 85% 90%；(ii) bottom blown gas is switched using nitrogen argon, and argon gas is automatically switched to later using nitrogen, 80% before oxygen supply 80%；(iii) it blows the first stage, oxygen flow uses 20000 21000Nm in 1min3/ h, rifle position use normal 1800 2000mm of slugging rifle position；It opens after blowing 1min, oxygen flow is adjusted to 13000Nm3/h；(iv) the deslagging moment is set as 8 10min after blowing starts；(v) blow second stage, and high 1700 1800mm of rifle position, which is opened, to be blown, and oxygen flow is adjusted to 18000Nm3/ h, converter terminal control targe are carbon ＜ 0.05%, phosphorus ＜ 0.004%.The present invention can control converter terminal phosphorus stabilizer≤0.004%, so as to stablize the target for realizing that single stove smelts ultralow phosphorus mild steel.
Description
Technical field
The invention belongs to combined blown converters to smelt ultralow phosphorus mild steel technical field, is smelted more particularly to a kind of combined blown converter
Double slag techniques of ultralow phosphorus mild steel.
Background technology
The removal of impurity element and the control of field trash are always metallargist's concern the most in steel.Phosphorus can be with
The low-temperature impact toughness of steel is significantly reduced, improves the ductile-brittle transition temperature of steel, steel occurs cold short, deteriorates welding performance etc., because
This, as far as possible reduce steel in phosphorus content become the high-level steel grade such as welding wire steel, cord steel, pipe line steel top priority it
One.For the enterprise using pneumatic steelmaking, dephosphorization is mainly completed in converter procedure, therefore dephosphorization is the main of converter smelting
Task.
For low-phosphorous steel grade, converter need to use deep dephosphorization technique.At present, converter deep dephosphorization method mainly has single slag process, double
Slag method and duplex practice.Single slag process smelting low carbon steel terminal phosphorus can only stabilization energy control to more than 0.008%（High-carbon steel can only be stablized
More than 0.01%）Level, further deep dephosphorization difficulty is larger.Traditional double slag process smelting low carbon steel terminal phosphorus is generally all
More than 0.005%.≤ 0.005% ultra-low phosphoretic steel kind is required for finished product phosphorus, whether single slag process or traditional double slag process
Substantially steady production can not be all realized.At present, the relatively stable method of production ultra-low phosphoretic steel mainly uses duplex practice both at home and abroad.
A duplex practice i.e. block converter dephosphorization, another block converter carry out decarburization and heating, two block converter duplex tissues production, to reach effective
Improve the quality of steel and shorten the purpose of smelting cycle.Duplex practice production is stablized, and smelting cycle is short, but to process matched therewith
Equipment requirement is higher, needs to carry out plant and equipment transformation, many enterprises can not use this method thus.Plant and equipment cannot be expired
Sufficient duplex practice and the less enterprise of ultra-low phosphoretic steel amount of product throughput, it is necessary to be considered as new smelting process in same block converter
Middle completion deep dephosphorization.
Invention content
The technical problems to be solved by the invention are, for above shortcoming of the existing technology, to propose that one kind is blown again and turn
Stove smelts double slag techniques of ultralow phosphorus mild steel, can control converter terminal phosphorus stabilizer≤0.004%, so as to which stable realization is single
Stove smelts the target of ultralow phosphorus mild steel.
The present invention solve more than technical problem technical solution be：
A kind of combined blown converter smelts double slag techniques of ultralow phosphorus mild steel, it is characterised in that：Include the following steps：
(i) molten iron and steel scrap are packed into converter according to hot metal ratio 85%-90%；
(ii) bottom blowing system：Bottom blown gas is switched using nitrogen argon, and argon is automatically switched to later using nitrogen, 80% before oxygen supply 80%
Gas, oxygen supply 40% before with 80% rear converter bottom blowing intensity be 0.1Nm3/ min/t, the bottom blowing intensity at remaining moment is 0.03-0.05
Nm3/min/t；
(iii) it blows the first stage, i.e. blowing started to the deslagging moment：Head batch slag charge is weighed, head batch slag charge includes：25-
The 40%-50% of 35kg/ tons of steel lime, 4-6kg/ tons of steel magnesium balls and total amount of returning mine；After lighting a fire successfully, head batch of material, 1min are added in
Interior oxygen flow uses 20000 Nm3/h -21000 Nm3/ h, rifle position use normal 1800 mm -2000mm of slugging rifle position；It opens
After blowing 1min, oxygen flow is adjusted to 13000Nm3/ h, rifle position are gradually adjusted to 1300mm, later permanent rifle position, constant flow blowing
To deslagging；
(iv) deslagging opportunity：The deslagging moment is set as 8 min -10min after blowing starts, and the 60% of deslagging amount >=total quantity of slag,
Deslagging moment control targe：1350-1380 DEG C of temperature, P weight percent ＜ 0.04%, C weight percent:2.8-3.0%；
(v) blow second stage, i.e., after deslagging：High 1700 mm -1800 mm of rifle position, which are opened, to be blown, and oxygen flow is adjusted to
18000Nm3/ h, two batch of materials add in 15-30kg/ tons of steel of lime, 2-3kg/ tons of steel of magnesium ball and 10-15kg/ tons of steel of returning mine, after blowing
Oxygen flow after molten iron carbon weight percent content ＜ 0.20%, is adjusted to 22000 Nm by the phase3/h -23000Nm3/ h, rifle position
1200 mm -1300mm of catch carbon rifle position are depressed into, carry out catch carbon and dephosphorization, converter terminal control targe is carbon weight percentage ＜
0.05%, phosphorus weight percent ＜ 0.004%.
The technical solution that further limits of the present invention is：
Aforementioned combined blown converter smelts double slag techniques of ultralow phosphorus mild steel, wherein step (i) in, enter converter molten iron phosphorus weight
Measure degree≤0.13%, molten iron silicon weight percent content≤0.65%, molten iron temperature≤1380 DEG C.
Aforementioned combined blown converter smelts double slag techniques of ultralow phosphorus mild steel, and wherein the weight percent of CaO contains in lime
Amount >=85%.
The beneficial effects of the invention are as follows：First stage of the invention is using big bottom blowing, low rifle position, low oxygen supply and flexibly feeds
Operation mode can not only control temperature slowly to rise, and ensure slag melting good but also can greatly improve dephosphorization rate early period, deslagging
Mitigate the dephosphorization pressure in later stage afterwards and reduce rephosphorization risk.Rifle position, oxygen supply and bottom blowing is adjusted flexibly in the blowing middle and later periods, can both control
Clinker processed prevents from returning dry and can further decarburization, dephosphorization.This method deep dephosphorization effect stability, can be by converter terminal phosphorus stabilizer
Control, so as to stablize the target for realizing that single stove smelts ultralow phosphorus mild steel, can meet finished product requirement and exist completely≤0.004%
The production requirement of less than 0.005% ultralow phosphorus mild steel.Double slag process using the present invention can meet the life of ultralow phosphorus mild steel
Production needs, and realizes the steady production of ultralow phosphorus mild steel, this double slag process is smelted ultralow phosphorus mild steel and had further the advantage that：（1）
Without special liquid iron pretreatment dephosphorizing, desiliconization equipment；（2）It does not need to additionally carry out scrap build or increases equipment, throw
Money is few；（3）Not only ultra-low phosphoretic steel can have been produced but also conventional single slag process can be restored rapidly and produce general steel grade；（4）Production regulation and control are convenient；
（5）Relative to the common duplex technique of deep dephosphorization, without special dephosphorization converter.
Specific embodiment
Embodiment 1
The present embodiment is double slag techniques that a kind of combined blown converter smelts ultralow phosphorus mild steel, and concrete technology is：It is multiple to 100 tons
90 tons of molten iron, 10.2 tons of steel scraps are added in blow converter, molten iron condition is：4.49%C, 0.38%Si, 0.17%Mn, 0.109%P,
0.01%S, 1297 DEG C of temperature：First stage uses 20000 Nm3The oxygen-supplying amount of/h, which is opened, to be blown, and flow is adjusted to 13000 after 1min
Nm3/ h blows to deslagging.It opens to blow and blows rifle position slowly near 1300mm by opening after rifle position 1800mm, 1min, keep permanent rifle position later
To deslagging.It opens to blow and 3148kg lime, 2432 ores, magnesium ball 500kg, 0.1 Nm of bottom blowing nitrogen intensity is added in backward converter3/
min/t.Blowing starts to propose rifle deslagging for 8.5 minutes.First stage terminates molten iron temperature and ingredient：2.93%C, 0.03%Si, 0.04%
Mn, 0.037%P, 0.012%S, 1376 DEG C of temperature.Second stage uses 18000 Nm3/ h oxygen-supplying amounts, which are opened, to be blown, and is opened and is blown rifle position
1700mm, process rifle position are adjusted flexibly, blow off rifle position 1200mm, 22000 Nm of later stage oxygen-supplying amount3/h.It opens to blow in backward converter and add
Enter 2073kg lime, 1433kg ores, 281 kg of magnesium ball repeatedly adds in lime and amounts to 827 kg on a small quantity later, total of returning mine
847kg.Finishing blowing, deslagging, thermometric, sampling, tapping.By above-mentioned smelting, tapping carbon is realized：0.042%, phosphorus：
0.0035%。
Embodiment 2
The present embodiment is double slag techniques that a kind of combined blown converter smelts ultralow phosphorus mild steel, and concrete technology is：It is multiple to 100 tons
88 tons of molten iron, 10.8 tons of steel scraps are added in blow converter, molten iron condition is：4.39%C, 0.40%Si, 0.15%Mn, 0.106%P,
0.02%S, 1324 DEG C of temperature：First stage uses 20000Nm3The oxygen-supplying amount blowing of/h, opens and blows rifle position 1850mm, later by opening
It blows rifle position and slowly near 1300mm and keeps permanent rifle position, open to blow and add in 3150kg lime, 2348kg ore deposits in rear 1min into converter
Stone, 505kg magnesium balls, 0.1 Nm of bottom blowing nitrogen intensity3/ min/t, first stage terminate molten iron temperature and ingredient：2.85%C,
0.02%Si, 0.03%Mn, 0.033%P, 0.024%S, 1387 DEG C of temperature；Second stage uses 18000Nm3The oxygen-supplying amount of/h is blown
Refining, opens and blows rifle position 1750mm, process rifle position is adjusted flexibly, blow off rifle 1200mm.It opens to blow and 2135kg lime is added in backward converter,
1468 ores, 293 kg of magnesium ball, the lime that repeatedly adds in a small amount of later amount to 932kg, return mine and amount to 956kg.Finishing blowing,
Slag, thermometric, sampling, tapping.By above-mentioned smelting, tapping carbon is realized：0.048%, phosphorus：0.0038%.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical solution, all fall within the present invention claims protection domain.
Claims (3)
1. a kind of combined blown converter smelts double slag techniques of ultralow phosphorus mild steel, it is characterised in that：Include the following steps：
(i) molten iron and steel scrap are packed into converter according to hot metal ratio 85%-90%；
(ii) bottom blowing system：Bottom blown gas is switched using nitrogen argon, and argon gas is automatically switched to later using nitrogen, 80% before oxygen supply 80%,
Oxygen supply 40% before with 80% rear converter bottom blowing intensity be 0.1Nm3/ min/t, the bottom blowing intensity at remaining moment is 0.03-0.05 Nm3/
min/t；
(iii) it blows the first stage, i.e. blowing started to the deslagging moment：Head batch slag charge is weighed, head batch slag charge includes：25-35kg/ tons
Steel lime, 4-6kg/ tons of steel magnesium balls and 2348kg ores；After lighting a fire successfully, head batch of material is added in, oxygen flow uses in 1min
20000 Nm3/h -21000 Nm3/ h, rifle position use normal 1800 mm -2000mm of slugging rifle position；It opens after blowing 1min, oxygen stream
Amount is adjusted to 13000Nm3/ h, rifle position are gradually adjusted to 1300mm, and permanent rifle position, constant flow blow to deslagging later；
(iv) deslagging opportunity：The deslagging moment is set as 8 min -10min after blowing starts, and the 60% of deslagging amount >=total quantity of slag, deslagging
Moment control targe：1350-1380 DEG C of temperature, P weight percent ＜ 0.04%, C weight percent:2.8-3.0%；
(v) blow second stage, i.e., after deslagging：High 1700 mm -1800 mm of rifle position, which are opened, to be blown, and oxygen flow is adjusted to 18000Nm3/
H, two batch of materials add in 15-30kg/ tons of steel of lime, 2-3kg/ tons of steel of magnesium ball and 10-15kg/ tons of steel of returning mine, and the blowing later stage works as molten iron
After carbon weight degree ＜ 0.20%, oxygen flow is adjusted to 22000 Nm3/h -23000Nm3/ h, rifle position are depressed into catch carbon
1200 mm -1300mm of rifle position, carry out catch carbon and dephosphorization, and converter terminal control targe is carbon weight percentage ＜ 0.05%, phosphorus weight
Measure percentage ＜ 0.004%.
2. combined blown converter as described in claim 1 smelts double slag techniques of ultralow phosphorus mild steel, it is characterised in that：The step
(i) in, enter converter molten iron phosphorus weight percent content≤0.13%, molten iron silicon weight percent content≤0.65%, molten iron temperature≤
1380℃。
3. combined blown converter as claimed in claim 1 or 2 smelts double slag techniques of ultralow phosphorus mild steel, it is characterised in that：It is described
Weight percent content >=85% of CaO in lime.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611007447.7A CN106636531B (en) | 2016-11-16 | 2016-11-16 | A kind of combined blown converter smelts double slag techniques of ultralow phosphorus mild steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611007447.7A CN106636531B (en) | 2016-11-16 | 2016-11-16 | A kind of combined blown converter smelts double slag techniques of ultralow phosphorus mild steel |
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| CN106636531A CN106636531A (en) | 2017-05-10 |
| CN106636531B true CN106636531B (en) | 2018-06-19 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109022670A (en) * | 2018-07-20 | 2018-12-18 | 首钢集团有限公司 | A kind of converter steel making method producing ultra-low phosphoretic steel |
| CN110129510B (en) * | 2019-06-04 | 2021-01-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method for improving the life of bottom blowing and oxygen powder spraying gun |
| CN112375974B (en) * | 2020-10-28 | 2022-09-20 | 南京钢铁股份有限公司 | Deformed steel bar produced by high-chromium molten iron and preparation method thereof |
| CN115747406A (en) * | 2022-12-01 | 2023-03-07 | 湖南华菱涟源钢铁有限公司 | Ultra-low phosphorus steel converter smelting method |
| CN116516098A (en) * | 2023-03-31 | 2023-08-01 | 南京钢铁股份有限公司 | Method for improving molten steel smelting yield of low-carbon low-phosphorus steel converter |
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| CN103103308A (en) * | 2013-03-06 | 2013-05-15 | 北京科技大学 | Method for controlling phosphorus content of end point molten steel smelted by a top-bottom combined blowing converter to be less than 30 ppm |
| CN104232830A (en) * | 2014-08-29 | 2014-12-24 | 武汉钢铁(集团)公司 | Method for smelting ultralow-phosphor steel at low temperature in converter |
| CN104480246A (en) * | 2014-12-02 | 2015-04-01 | 天津钢铁集团有限公司 | Slag control method of dephosphorization foaming slag in converter double-slag-process steel making |
| CN105132612A (en) * | 2014-05-29 | 2015-12-09 | 上海梅山钢铁股份有限公司 | Converter less slag smelting early stage deslagging control method |
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- 2016-11-16 CN CN201611007447.7A patent/CN106636531B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103103308A (en) * | 2013-03-06 | 2013-05-15 | 北京科技大学 | Method for controlling phosphorus content of end point molten steel smelted by a top-bottom combined blowing converter to be less than 30 ppm |
| CN105132612A (en) * | 2014-05-29 | 2015-12-09 | 上海梅山钢铁股份有限公司 | Converter less slag smelting early stage deslagging control method |
| CN104232830A (en) * | 2014-08-29 | 2014-12-24 | 武汉钢铁(集团)公司 | Method for smelting ultralow-phosphor steel at low temperature in converter |
| CN104480246A (en) * | 2014-12-02 | 2015-04-01 | 天津钢铁集团有限公司 | Slag control method of dephosphorization foaming slag in converter double-slag-process steel making |
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