CN102936640B - Technique for smelting stainless steel through RKEF (rotary kiln-electric furnace) and AOD furnace duplex process - Google Patents
Technique for smelting stainless steel through RKEF (rotary kiln-electric furnace) and AOD furnace duplex process Download PDFInfo
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- CN102936640B CN102936640B CN201210484958.3A CN201210484958A CN102936640B CN 102936640 B CN102936640 B CN 102936640B CN 201210484958 A CN201210484958 A CN 201210484958A CN 102936640 B CN102936640 B CN 102936640B
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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 as 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 be substantially 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 process such as decarburization, dephosphorization, then be oxidized and final refining, complete the adjustment of liquid alloy composition and temperature, finally become stainless steel, the qualified stainless steel after refining adopts continuous casting system to be made into stainless steel slab.
Owing to using thick nickelalloy piece to make main raw material in the stainless process of production, power consumption is high, has increased production cost; And production link is many, 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 place, and environmental pollution is larger; Also has employee's the series of problems such as the corresponding increasing of labour intensity.
And adopt the thick nickelalloy of RKEF explained hereafter by measures such as control, slag temperature, molten iron temperature and preservation and controlling to slag type, and directly molten iron is sent into the stainless Technologies of production such as AOD stove duplex refining also not have been reported, belong to blank both at home and abroad.
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, adopt 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 and 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) enter the required thick nickelalloy molten iron temperature of stove according to AOD refining furnace, adopt the thick nickelalloy of RKEF technique melting, by slag type is controlled;
2) the gentle iron temperature of slag while strictly controlling thick nickelalloy production;
3) adopt the thick nickelalloy molten iron of ladle splendid attire;
4) gone out after thick nickelalloy molten iron, covered with insulation material immediately, controlled molten iron temperature well;
5) with driving handling ladle thick nickelalloy molten iron is sent into AOD refining furnace and carry out refining;
6) execution of AOD refining furnace regulations for technical operation is pressed in the refining on 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 pressed the execution of furnaceman's LF skill working specification;
9) large Baogang water is transported to continuous casting turn around table by traveling crane, the orthogonal base of continuous casting or slab;
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), slag type being controlled is that Si/Mg mass ratio is controlled between 1.75-1.85.
Further, in step 2) in slag temperature control within the scope of 1550-1570 ℃; Iron temperature control is within the scope of 1500-1520 ℃.
Further, adopt carbonization rice husk at insulation material described in step 4), within its granularity is controlled at 0～5mm scope; Humidity is controlled at H
2o≤0.5%.
Further, in step 5) Raw quality proportioning be: the red usage quantity of sending ferronickel water is controlled within the scope of 63%-67%, and high carbon ferro-chrome add-on is controlled within the scope of 28%-30%, and the add-on of slag former is controlled within the scope of 5%-7%.
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, make full use 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, while making it enter the refining of AOD stove, reach that the technology such as certain temperature are carried out stainless test and industrialness is produced, 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 produce the refining stainless steel product that meets national standard and user's requirement.
Embodiment:
The reductibility of oxide compound is under equality of temperature, and linear position is in lower element, and easily by the Reduction of Oxide on its top out, 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 that thick nickelalloy is produced 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
2; Cr
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 on 33000kVA electric furnace, 45tAOD refining furnace, LF refining furnace, the second-rate small plate blank continuous casting machine of R10 bis-machine, narrate the method for the present invention of implementing:
1) enter the required thick nickelalloy molten iron temperature of stove according to AOD refining furnace, adopt the thick nickelalloy of RKEF technique melting, by slag type is controlled, its Si/Mg(mass ratio) be controlled between 1.75-1.85;
2) the gentle iron temperature of slag while strictly controlling thick nickelalloy production, slag temperature control is within the scope of 1550-1570 ℃; Iron temperature control is within the scope of 1500-1520 ℃;
3) adopt the thick nickelalloy molten iron of ladle splendid attire;
4) gone out after thick nickelalloy molten iron, used immediately carbonization rice husk (insulation material) to be covered, controlled molten iron temperature well, within wherein the granularity of insulation material is controlled at 0～5mm scope; Its humidity is controlled at: H
2o≤0.5%.
5) with driving handling ladle thick nickelalloy molten iron is sent into AOD refining furnace and 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: the 50000-15167=34833(kg that send)
(2) oxidation period lime adding amount:
Lime adding amount={ [%Si] * 50000*2.14*R}/(%CaO) effective
Wherein, in formula, [%Si] represents silicone content in molten steel;
R=(%CaO)/(%SiO
2) expression basicity; (%CaO) effective---effective CaO content in lime.
Wherein the red usage quantity of sending ferronickel water is controlled within the scope of 63%-67%, and high carbon ferro-chrome add-on is controlled within the scope of 28%-30%, and the add-on of lime is controlled within the scope of 5%-7%.
6) execution of AOD refining furnace regulations for technical operation is pressed in the refining on AOD refining furnace, specific as follows:
(1) according to the carbon content in molten steel, feed maximum oxygen amount, adjust suitable rare gas element ratio simultaneously, reach decarburization and cr yield temperature control object, molten steel terminal temperature is controlled within the scope of 1660-1680 ℃, and molten steel aim carbon content is controlled within the scope of 0.035%-0.045%.
(2) add reductive agent ferrosilicon by feed bin, the oxide compound in reducing slag;
(3) add slag former, sulphur in 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 pressed the execution of furnaceman's LF skill working specification, specific as follows:
(1) power transmission slag heats up, and temperature is risen to and meets continuous casting requirement temperature;
(2) adjust argon pressure 0.5Mpa left and right, 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) large Baogang water is transported to continuous casting turn around table by traveling crane, the orthogonal base of continuous casting or slab;
10) execution of continuous caster regulations for technical operation is pressed in the making of rectangular bloom or slab, 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; Size of plate blank: 99000mm × 160mm × (470-750) mm.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 control, slag temperature, the control of molten iron temperature and the selection of insulation material of slag type and granularity thereof, humidity when to thick nickelalloy melting, when stainless steel is produced, proportioning raw materials is reasonably combined, 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 (3)
1. the technique of a smelting stainless steel, it is characterized in that, described technique is the technique that has adopted 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 and produce stainless steel, and be made into rectangular bloom or slab by continuous casting system, the technique of described smelting stainless steel comprises following concrete steps:
1) enter the required thick nickelalloy molten iron temperature of stove according to AOD refining furnace, adopt the thick nickelalloy of RKEF technique melting, and slag type is controlled; In step 1) to slag type control be make Si/Mg mass ratio be controlled at 1.75 ?between 1.85;
2) the gentle iron temperature of slag while strictly controlling thick nickelalloy production; In step 2) in slag temperature control 1550 ?within the scope of 1570 ℃; Iron temperature control 1500 ?within the scope of 1520 ℃;
3) adopt the thick nickelalloy molten iron of ladle splendid attire;
4) gone out after thick nickelalloy molten iron, covered with insulation material immediately, controlled molten iron temperature well; Adopt carbonization rice husk at insulation material described in step 4), within its granularity is controlled at 0～5mm scope; Humidity is controlled at H
2o≤0.5%;
5) with driving handling ladle thick nickelalloy molten iron is sent into AOD refining furnace and carry out refining; In step 5) Raw quality proportioning be: the red usage quantity of sending ferronickel water is controlled within the scope of 63%-67%, and high carbon ferro-chrome add-on is controlled within the scope of 28%-30%, and the add-on of slag former is controlled within the scope of 5%-7%;
6) execution of AOD refining furnace regulations for technical operation is pressed in the refining on 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 pressed the execution of furnaceman's LF skill working specification;
9) large Baogang water is transported to continuous casting turn around table by traveling crane, the orthogonal base of continuous casting or slab;
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 rectangular bloom or slab.
2. the technique of smelting stainless steel according to claim 1, is characterized in that, described slag former is lime, fluorite or magnesia.
3. a stainless steel, is characterized in that, the technique of what described stainless steel adopted the is described smelting stainless steel of one of claim 1-2 is made.
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| CN104232845B (en) * | 2014-09-03 | 2016-11-23 | 浙江瑞浦科技有限公司 | AOD slagging method in a kind of sulfur-bearing free cutting stainless steel smelting |
| CN104313241B (en) * | 2014-10-08 | 2016-06-29 | 邢台钢铁有限责任公司 | A kind of method of AOD furnace smelting stainless steel |
| 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 |
| CN107326170B (en) * | 2016-04-29 | 2020-02-04 | 青拓集团有限公司 | Process for treating metal surface waste |
| 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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| 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 |
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Effective date of registration: 20210112 Address after: 355006 Longzhu village, Wanwu Town, Ningde City, Fujian Province Patentee after: TSING TUO GROUP Co.,Ltd. Address before: 355006 Wanwu industrial and Trade Zone, Fu'an City, Ningde City, Fujian Province Patentee before: FUJIAN DINGXIN IND Co.,Ltd. |
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