CN102936640A - Novel technique for smelting stainless steel through RKEF (rotary kiln-electric furnace) and AOD furnace duplex process - Google Patents
Novel technique for smelting stainless steel through RKEF (rotary kiln-electric furnace) and AOD furnace duplex process Download PDFInfo
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- CN102936640A CN102936640A CN2012104849583A CN201210484958A CN102936640A CN 102936640 A CN102936640 A CN 102936640A CN 2012104849583 A CN2012104849583 A CN 2012104849583A CN 201210484958 A CN201210484958 A CN 201210484958A CN 102936640 A CN102936640 A CN 102936640A
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- stainless steel
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- nickelalloy
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000010935 stainless steel Substances 0.000 title claims abstract description 29
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 29
- 238000003723 Smelting Methods 0.000 title claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910000990 Ni alloy Inorganic materials 0.000 claims abstract description 33
- 229910052742 iron Inorganic materials 0.000 claims abstract description 32
- 238000007670 refining Methods 0.000 claims abstract description 31
- 239000002893 slag Substances 0.000 claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000009749 continuous casting Methods 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000012774 insulation material Substances 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 4
- 229910000863 Ferronickel Inorganic materials 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 238000003763 carbonization Methods 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- 239000010903 husk Substances 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000005266 casting Methods 0.000 abstract description 3
- 230000002829 reductive effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000003169 placental effect Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a technique for smelting stainless steel, and particularly relates to a novel technique for smelting stainless steel through an RKEF (rotary kiln-electric furnace) and AOD furnace duplex process. The technique comprises the following steps: directly feeding crude nickel alloy molten iron produced by an RKEF into an AOD furnace, performing duplex refining to produce stainless steel, and making the stainless steel into slabs through a continuous casting system. The invention has the following beneficial effects: intermediate production procedures, such as crude nickel alloy casting, intermediate frequency furnace remelting and the like, are reduced; the heat energy of the crude nickel alloy molten iron is fully utilized; the slag type, slag temperature and molten iron temperature in the crude nickel alloy production are controlled, so that the temperature can reach a certain value during AOD furnace refining, and the pilot and industrial production of the stainless steel can be finished through other technologies; the technique reduces the power consumption and production cost, shortens the product yield time, ensures that the on-site environment is cleaner and more friendly and relieves the labor intensity of personnel; and refined stainless steel products meeting the national standards and customer requirements can be produced.
Description
Technical field:
The invention belongs to and be the metallurgical engineering technical field, be specifically related to the new processing method of a kind of RKEF of employing and AOD stove duplex practice smelting stainless steel.
Background technology:
At present, produce both at home and abroad stainless method and basically be and adopt thick nickelalloy piece that ore-smelting furnace produces as main raw material, melt at intermediate frequency furnace, by AOD refining furnace and other raw materials proportioning by a certain percentage, after the processes such as decarburization, dephosphorization, carry out again oxidation and final refining, finish the adjustment of liquid alloy composition and temperature, finally become stainless steel, the qualified stainless steel after the refining adopts continuous casting system to be made into the stainless steel slab.
Because use thick nickelalloy piece to make main raw material in producing stainless process, power consumption is high, has increased production cost; And production link is many, and product time of becoming a useful person is long, and production capacity is low, increases investment goods (increasing thick nickelalloy casting system, intermediate frequency furnace etc.) and stores up the place, and environmental pollution is larger; The series of problems such as the corresponding increasing of labour intensity that also have the employee.
And adopt the thick nickelalloy of RKEF explained hereafter by the measures such as control, slag temperature, molten iron temperature and preservation and controlling to the slag type, directly molten iron being sent into the stainless Technology of productions such as AOD stove duplex refining does not also appear in the newspapers, and belongs to domestic and international blank.
Summary of the invention:
The present invention is in order to address the deficiencies of the prior art, improve stainless production capacity, reduce production costs, the present invention is optimized aspect production technique, adopted the novel process of RKEF and AOD stove duplex practice smelting stainless steel, the thick nickelalloy molten iron of RKEF explained hereafter is directly sent into the refining of AOD stove duplex produce stainless steel, and be made into slab by continuous casting system.
The present invention adopts a kind of technique of smelting stainless steel, and described technique comprises following concrete steps:
1) enters the required thick nickelalloy molten iron temperature of stove according to the AOD refining furnace, adopt the thick nickelalloy of RKEF technique melting, by the slag type is controlled;
The gentle iron temperature of slag when 2) strictly controlling thick nickelalloy production;
3) adopt the thick nickelalloy molten iron of ladle splendid attire;
4) gone out thick nickelalloy molten iron after, with insulation material it is covered immediately, control molten iron temperature well;
5) with driving handling ladle and thick nickelalloy molten iron is sent into the AOD refining furnace carry out refining;
6) execution of AOD refining furnace regulations for technical operation is pressed in the refining on the AOD refining furnace;
7) pour qualified AOD molten steel into ladle, carry out deep deoxidation with traveling crane to LF stove;
8) large Baogang water is carried out by furnaceman's LF working specification of planting;
9) Baogang's water is transported to the continuous casting turn around table by traveling crane, the orthogonal base of continuous casting or slab greatly;
10) execution of continuous caster regulations for technical operation is pressed in the making of rectangular bloom or slab;
11) stainless steel is put in storage after making slab.
Further, in step 1) the slag type being controlled is that the Si/Mg mass ratio is controlled between the 1.75-1.85.
Further, in step 2) in the slag temperature control in 1550-1570 ℃ of scope; The iron temperature control is in 1500-1520 ℃ of scope.
Further, adopt carbonization rice husk at insulation material described in the step 4), its granularity is controlled within 0～5mm scope; Humidity is controlled at H
2O≤0.5%.
Further, in step 5) Raw quality proportioning be: the red usage quantity of ferronickel water of sending is controlled in the 63%-67% scope, and the high carbon ferro-chrome add-on is controlled in the 28%-30% scope, and the add-on of slag former is controlled in the 5%-7% scope.
Further, described slag former is lime, fluorite or magnesia.
The present invention also provides a kind of stainless steel, and described stainless steel adopts above-mentioned technique to make.
The invention has the beneficial effects as follows to reduce and produce middle thick nickelalloy casting, the links such as intermediate frequency furnace remelting, take full advantage of thick nickelalloy molten iron heat energy, by the slag type control that thick nickelalloy is produced, the temperature of slag temperature and molten iron is controlled, reach certain technology such as temperature when making it enter the refining of AOD stove and carry out stainless test and industrialness production, adopt such technique not only to reduce power consumption, production cost, the product time shorten of becoming a useful person, improve production capacity, site environment is clean environment firendly more, also alleviate employee's labour intensity, and produced the refining stainless steel product that meets national standard and customer requirements.
Embodiment:
The reductibility of oxide compound is under equality of temperature, and linear position is in lower element, and easily with the Reduction of Oxide on its top out, namely its oxide compound is more stable, that is to say in melting temperature range, and the reduction sequence of oxide compound is nickel, iron, silicon.
1) reaction formula of thick nickelalloy production is as follows:
NiO+C=Ni+CO
FeO+C=Fe+CO
SiO
2+2C=Si+2CO
2) the principal reaction formula of stainless steel refining is as follows:
(1) decarburizing reaction mechanism
2C+O
2 (gas)=2CO; C+O
2 (gas)=CO
2Cr
3O
4(is solid)+ 4C=3Cr+4CO
(2) desilication reaction mechanism
Si+O
2 (gas)=SiO
2
(3) reduction reaction mechanism
Cr
3O
4(is solid)+ 2Si=3Cr+2SiO
2
(4) desulfurization reaction mechanism
FeS+CaO=CaS+FeO
Specific embodiment 1
Now to produce stainless steel as example at 33000kVA electric furnace, 45tAOD refining furnace, LF refining furnace, the second-rate small plate blank continuous casting machine of R10 two machines, narrate the method for the present invention of implementing:
1) enter the required thick nickelalloy molten iron temperature of stove according to the AOD refining furnace, adopt the thick nickelalloy of RKEF technique melting, by the slag type being controlled its Si/Mg(mass ratio) be controlled between the 1.75-1.85;
The gentle iron temperature of slag when 2) strictly controlling thick nickelalloy production, the slag temperature control is in 1550-1570 ℃ of scope; The iron temperature control is in 1500-1520 ℃ of scope;
3) adopt the thick nickelalloy molten iron of ladle splendid attire;
4) gone out thick nickelalloy molten iron after, use immediately carbonization rice husk (insulation material) that it is covered, control molten iron temperature well, wherein the granularity of insulation material is controlled within 0～5mm scope; Its humidity is controlled at: H
2O≤0.5%.
5) with driving handling ladle and thick nickelalloy molten iron is sent into the AOD refining furnace carry out refining; Wherein alloy material and slag former add-on are calculated:
(1) alloy material adds calculating:
High carbon ferro-chrome add-on: 50000*18.2%/60%=15167(kg)
The red ferronickel water yield of sending: 50000-15167=34833(kg)
(2) oxidation period lime adding amount:
Lime adding amount={ [%Si] * 50000*2.14*R}/(%CaO) effective
Wherein, [%Si] represents silicone content in the molten steel in the formula;
R=(%CaO)/(%SiO
2) expression basicity; (%CaO) effective---effective CaO content in the lime.
Wherein the red usage quantity of ferronickel water of sending is controlled in the 63%-67% scope, and the high carbon ferro-chrome add-on is controlled in the 28%-30% scope, and the add-on of lime is controlled in the 5%-7% scope.
6) execution of AOD refining furnace regulations for technical operation is pressed in the refining on the AOD refining furnace, and is specific as follows:
(1) according to the carbon content in the molten steel, feed the maximum oxygen amount, adjust simultaneously suitable rare gas element ratio, reach decarburization and cr yield temperature control purpose, the molten steel terminal temperature is controlled in the 1660-1680 ℃ of scope, and molten steel aim carbon content is controlled in the 0.035%-0.045% scope.
(2) add reductive agent ferrosilicon, the oxide compound in the reducing slag by feed bin;
(3) add slag former, sulphur in the steel is controlled at below 0.005%, wherein slag former can be: lime, fluorite, magnesia;
7) pour qualified AOD molten steel into ladle, carry out deep deoxidation with traveling crane to LF stove;
8) large Baogang water is carried out by furnaceman's LF working specification of planting, and is specific as follows:
(1) send electrochemical slag to heat up, temperature is risen to satisfy continuous casting requirement temperature;
(2) adjust about argon pressure 0.5Mpa soft blow 10-15 minute;
(3) stop the supple of gas or steam calm molten steel about 8 minutes, guarantee that inclusion fully floats, improve Molten Steel Cleanliness;
9) Baogang's water is transported to the continuous casting turn around table by traveling crane, the orthogonal base of continuous casting or slab greatly;
10) execution of continuous caster regulations for technical operation is pressed in the making of rectangular bloom or slab, and is specific as follows:
(1) tundish temperature is controlled at 1480-1485 ℃; Pulling rate is controlled at 1.25-1.30m/min;
(2) stopper, two cold water spray hydrominings are with automatically controlling;
(3) whole process protection cast.
11) stainless steel is put in storage after making slab.
The Chemical Composition of product and slag composition:
(1) product composition
(2) slag composition
The physical condition of product of the present invention: be tabular; Rectangular bloom size: 6000mm * 220mm * 260mm; The mm of size of plate blank: 99000mm * 160mm * (470-750).The product that novel process technology of the present invention is produced is applicable to oil, chemical industry, shipbuilding, automobile, building, food, electronics, medical facilities, communal facility etc.
In sum, producing and manufacturing technique of the present invention, the control of the selection of the control of the control of slag type, slag temperature, molten iron temperature and insulation material and granularity thereof, humidity by to thick nickelalloy melting the time, proportioning raw materials was reasonably combined when stainless steel was produced, not only reduce power consumption, reduced its production cost, product become a useful person time shorten, improve production capacity, site environment is clean environment firendly more, has also alleviated employee's labour intensity.
Claims (8)
1. the technique of a smelting stainless steel, it is characterized in that, described technique is to have adopted the novel process of RKEF and AOD stove duplex practice smelting stainless steel, the thick nickelalloy molten iron of RKEF explained hereafter is directly sent into the refining of AOD stove duplex produce stainless steel, and be made into slab by continuous casting system.
2. technique according to claim 1 is characterized in that, described technique comprises following concrete steps:
1) enters the required thick nickelalloy molten iron temperature of stove according to the AOD refining furnace, adopt the thick nickelalloy of RKEF technique melting, by the slag type is controlled;
The gentle iron temperature of slag when 2) strictly controlling thick nickelalloy production;
3) adopt the thick nickelalloy molten iron of ladle splendid attire;
4) gone out thick nickelalloy molten iron after, with insulation material it is covered immediately, control molten iron temperature well;
5) with driving handling ladle and thick nickelalloy molten iron is sent into the AOD refining furnace carry out refining;
6) execution of AOD refining furnace regulations for technical operation is pressed in the refining on the AOD refining furnace;
7) pour qualified AOD molten steel into ladle, carry out deep deoxidation with traveling crane to LF stove;
8) large Baogang water is carried out by furnaceman's LF working specification of planting;
9) Baogang's water is transported to the continuous casting turn around table by traveling crane, the orthogonal base of continuous casting or slab greatly;
10) execution of continuous caster regulations for technical operation is pressed in the making of rectangular bloom or slab;
11) stainless steel is put in storage after making slab.
3. technique according to claim 2 is characterized in that, in step 1) the slag type being controlled is that the Si/Mg mass ratio is controlled between the 1.75-1.85.
4. technique according to claim 2 is characterized in that, in step 2) in the slag temperature control in 1550-1570 ℃ of scope; The iron temperature control is in 1500-1520 ℃ of scope.
5. technique according to claim 2 is characterized in that, adopts carbonization rice husk at insulation material described in the step 4), and its granularity is controlled within 0～5mm scope; Humidity is controlled at H
2O≤0.5%.
6. technique according to claim 2, it is characterized in that, in step 5) Raw quality proportioning be: the red usage quantity of ferronickel water of sending is controlled in the 63%-67% scope, and the high carbon ferro-chrome add-on is controlled in the 28%-30% scope, and the add-on of slag former is controlled in the 5%-7% scope.
7. technique according to claim 2 is characterized in that, described slag former is lime, fluorite or magnesia.
8. a stainless steel is characterized in that, what described stainless steel adopted is that the described technique of one of claim 1-7 is made.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210484958.3A CN102936640B (en) | 2012-11-23 | 2012-11-23 | Technique for smelting stainless steel through RKEF (rotary kiln-electric furnace) and AOD furnace duplex process |
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|---|---|---|---|
| CN201210484958.3A CN102936640B (en) | 2012-11-23 | 2012-11-23 | Technique for smelting stainless steel through RKEF (rotary kiln-electric furnace) and AOD furnace duplex process |
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| Publication Number | Publication Date |
|---|---|
| CN102936640A true CN102936640A (en) | 2013-02-20 |
| CN102936640B CN102936640B (en) | 2014-05-14 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232845A (en) * | 2014-09-03 | 2014-12-24 | 浙江瑞浦科技有限公司 | Argon oxygen decarburization (AOD) slag-making method during smelting of sulfur-containing free-cutting stainless steel |
| CN104313241A (en) * | 2014-10-08 | 2015-01-28 | 邢台钢铁有限责任公司 | A method for smelting stainless steel in an AOD furnace |
| CN104451349A (en) * | 2014-12-12 | 2015-03-25 | 福建鼎信实业有限公司 | Stainless steel and smelting process thereof |
| CN105219923A (en) * | 2015-09-30 | 2016-01-06 | 福建鼎信实业有限公司 | A kind of RKEF produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel |
| WO2017186162A1 (en) * | 2016-04-29 | 2017-11-02 | 青拓集团有限公司 | Process for treating metal surface waste |
| CN110004351A (en) * | 2019-05-23 | 2019-07-12 | 中国恩菲工程技术有限公司 | The production system of copper bearing steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607287A (en) * | 2012-04-10 | 2012-07-25 | 上海瑞恩能源投资有限公司 | Ferro-nickel smelting process waste heat generating system |
-
2012
- 2012-11-23 CN CN201210484958.3A patent/CN102936640B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102607287A (en) * | 2012-04-10 | 2012-07-25 | 上海瑞恩能源投资有限公司 | Ferro-nickel smelting process waste heat generating system |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104232845A (en) * | 2014-09-03 | 2014-12-24 | 浙江瑞浦科技有限公司 | Argon oxygen decarburization (AOD) slag-making method during smelting of sulfur-containing free-cutting stainless steel |
| CN104313241A (en) * | 2014-10-08 | 2015-01-28 | 邢台钢铁有限责任公司 | A method for smelting stainless steel in an AOD furnace |
| CN104451349A (en) * | 2014-12-12 | 2015-03-25 | 福建鼎信实业有限公司 | Stainless steel and smelting process thereof |
| WO2016090769A1 (en) * | 2014-12-12 | 2016-06-16 | 福建鼎信实业有限公司 | Stainless-steel and smelting process thereof |
| CN105219923A (en) * | 2015-09-30 | 2016-01-06 | 福建鼎信实业有限公司 | A kind of RKEF produces the technique of ferronickel, ferrochrome and AOD furnace triplex process smelting stainless steel |
| WO2017054299A1 (en) * | 2015-09-30 | 2017-04-06 | 福建鼎信实业有限公司 | Triplex stainless steel manufacturing process via rkef-based ferronickel and ferrochrome production and aod furnace |
| WO2017186162A1 (en) * | 2016-04-29 | 2017-11-02 | 青拓集团有限公司 | Process for treating metal surface waste |
| CN107326170A (en) * | 2016-04-29 | 2017-11-07 | 青拓集团有限公司 | For the technique for handling metal surface waste |
| CN107326170B (en) * | 2016-04-29 | 2020-02-04 | 青拓集团有限公司 | Process for treating metal surface waste |
| CN110004351A (en) * | 2019-05-23 | 2019-07-12 | 中国恩菲工程技术有限公司 | The production system of copper bearing steel |
| CN110004351B (en) * | 2019-05-23 | 2024-04-19 | 中国恩菲工程技术有限公司 | Production system of copper-containing steel |
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| CN102936640B (en) | 2014-05-14 |
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