CN1203196C - End point controlling process for smelting low carbon steel in electric furnace - Google Patents
End point controlling process for smelting low carbon steel in electric furnace Download PDFInfo
- Publication number
- CN1203196C CN1203196C CNB02115094XA CN02115094A CN1203196C CN 1203196 C CN1203196 C CN 1203196C CN B02115094X A CNB02115094X A CN B02115094XA CN 02115094 A CN02115094 A CN 02115094A CN 1203196 C CN1203196 C CN 1203196C
- Authority
- CN
- China
- Prior art keywords
- electric furnace
- end point
- carbon
- controlling process
- carbon steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention discloses an end point controlling process for smelting low-carbon steel in an electric furnace, which orderly comprises the following steps: (a) compounding: conventional carbon compounding raw materials are adopted, and the carbon compounding quantity is controlled by 1.0% to 1.8%; (b) the control over C/O ratio: the C/O is controlled through a C-O gun manipulator of a furnace door as follows: at the prior period of smelting, namely that when the temperature is less than 1520 DEG C, the C/O ratio is 1:2; at the intermediate period of smelting, namely that when the temperature is from 1520 DEG C to 1580 DEG C, the C/O ration is 1:1; at the later period of smelting, namely that the temperature is higher than 1580 DEG C, the C/O ratio is 2:1, wherein the unit of C is kg/min, and the unit of O is NM<3>/min; (c) the control over the typical components of foamed slag: CaO/SiO2 is from 2.1 to 3.0, and FeO is from 25% to 30%; (d) tapping: when the a<o> is from 750 to 900 ppm and the temperature is from 1620 DEG C to 1640 DEG C, the tapping can be carried out. The present invention enriches the producing method of low-carbon steel, fills the blank of low-carbon molten steel required by an electric furnace to smelt hot rolling steel coils, provides more process selections for the production of the low-carbon steel and has the advantages of stabile end point controlling process, short smelting time and corresponding reduction of production energy consumption and cost.
Description
Affiliated technical field
The present invention relates to the end point controlling process of smelting low carbon steel in electric furnace, particularly relate to the electrosmelting carbon content below 0.08%, the end point controlling process of the required soft steel of heat supply steel rolling volume.
Background technology
Traditional electrosmelting generally is applicable to carbon content at carbon steel more than 0.1% or steel alloy, adopts converter process to smelt for carbon content usually at the soft steel below 0.08%.
Traditional electric furnace owing to can not accurately control the oxidisability of molten steel, thereby causes the peroxidation of molten steel when the smelting low carbon steel, directly produce following bad result: (1) iron and steel stock recovery rate is low; (2) alloy consumption is big.
Percentage ratio related in this specification sheets is weight percentage.
Summary of the invention
The end point controlling process that the purpose of this invention is to provide a kind of smelting low carbon steel in electric furnace, this technology can adopt electrosmelting go out carbon content below 0.08%, the required low-carbon (LC) molten steel of heat supply steel rolling volume.
In order to achieve the above object, the present invention adopts modern electric furnace to smelt, and can reach high-level efficiency under high oxygen supply intensity, and its oxygen supply intensity is usually at 30NM
3More than/the t, its technical process is: molten steel is molten clear → quantitatively control C/O ratio → foamy slag → decide a
[o], C → thermometric → tapping, the key of this flow process is a
[o]Control.The present invention is by the blowing oxygen quantity and the C/O ratio of quantitative control molten steel, and a of detection by quantitative molten steel
[o]And temperature, to realize the terminal point control of smelting low carbon steel in electric furnace.
The end point controlling process of smelting low carbon steel in electric furnace of the present invention may further comprise the steps successively:
(a) batching: select conventional mixed carbon raw material for use, make mixed carbon comtent be controlled at 1.0～1.8%.
(b) control C/O ratio: C/O is carried out following control by fire door C-O rifle mechanical manipulator:
In melting early stage, promptly temperature below 1520 ℃ the time, C/O=1: 2.
In melting mid-term, promptly temperature in the time of 1520 ℃～1580 ℃, C/O=1: 1.
In the melting later stage, promptly temperature more than 1580 ℃ the time, C/O=2: 1.
Wherein, the unit of C is kg/min, and the unit of O is NM
3/ min.
(c) typical composition of foamy slag is controlled to be: CaO/SiO
2=2.1～3.0, FeO:25%～30%.
(d) tapping: work as a
[o]=750～900ppm, temperature can be tapped in the time of 1620 ℃～1640 ℃.
Mixed carbon raw material in the described step (a) mainly contains: conventional raw materials such as the pig iron, molten iron, HBI, and mixed carbon comtent is 1.0～1.5% preferably, when using HBI, generally it joins C content between 1.2～1.8%.Because the CSP production technique is had relatively high expectations to steel quality, must control the residual element of molten steel, especially, reach specified requirement in order to make the copper content in the molten steel to the control of Cu content in the molten steel, except utilizing 15～25% high duty pig iron, also can use direct-reduced iron DRI/HBI.The main purpose that height is joined carbon is: for high oxygen supply intensity provides condition, and for taking off S, taking off P good power is provided.
In described step (b), the carbon amount abundance in the melting molten bath in early stage, so the C/O ratio should be less; Carbon amount in the melting later stage molten bath is limited, for guaranteeing the carbon of surplus, makes the molten bath that peroxidation not take place, and the C/O ratio should be bigger.
In described step (c), because influencing the factor of foamy slag mainly contains: the surface tension of slag, slag viscosity, basicity, FeO content and gas supply etc., the present invention is by the furnace door carbon oxygen lance mechanical manipulator, control the C/O ratio of different smelt stage and the angle of carbon-oxygen gun, to obtain good foamy slag.
In described step (d), because temperature one is regularly, [C] in the molten bath, [O] is long-pending is a constant, works as a
[o]=750～900ppm, temperature is in the time of 1620 ℃～1640 ℃, and C content is 0.035～0.05%.
The present invention compared with prior art has the following advantages: the present invention changes the traditional technology of being produced soft steel by converter, enriched the production method of soft steel, filled up the blank of the required low-carbon (LC) molten steel of electrosmelting coils of hot-rolled steel, provide more process choice for producing soft steel.End point controlling process of the present invention is stable, and tap to tap time is short, the also corresponding decline of its production energy consumption and cost.
Embodiment
Present embodiment employing capacity is 150 tons a uhp electric arc furnace (UHP electric furnace), be characterized in using in a large number oxygen, promptly adopt carbon-oxygen gun and oxygen oil burner, electric furnace is furnished with a water-cooled furnace door carbon oxygen lance, wherein have two oxygen spray orifices and a carbon spray orifice, total amount is 2 * 2000Nm
3/ h, 6 furnace wall oxygen oil burners; Carbon-oxygen gun is used to cut steel scrap, improves thermal source, decarburization, making foamed slag.
Present embodiment may further comprise the steps successively:
(a) batching: the mixed carbon raw material of present embodiment is as follows:
| The 15t broken material |
| The 20t pig iron |
| Useless among the 20t |
| The 10t pig iron |
| The 20t broken material |
| The 15t broken material |
| The 10t pig iron |
| Useless among the 20t |
| The 10t pig iron |
| The 20t broken material |
Be broken material 70t, in useless 40t, pig iron 50t, its mixed carbon comtent is 1.38%.
(b) control C/O ratio: C/O is controlled by the furnace door carbon oxygen lance mechanical manipulator.
In melting early stage, promptly temperature below 1520 ℃ the time, C/O=1: 2, wherein the unit of C is kg/min, the unit of O is NM
3/ min; In melting mid-term, promptly temperature in the time of 1520 ℃～1580 ℃, C/O=1: 1; In the melting later stage, promptly temperature more than 1580 ℃ the time, C/O=2: 1.
Carbon-oxygen gun should keep its rifle head oblique cutting in slag, and from about the 30mm of molten bath.
(c) Composition Control of foamy slag:
The typical composition of foamy slag is: CaO:36%, SiO
2: 17%, MgO:10%, MnO:5%, FeO:25%, Al
2O
3: 5%, P:0.5%, S:0.5%.
The light dolomite that has added the 2.2t/ stove in the present embodiment, wherein contain the MgO about 30%, not only help improving electric furnace furnace life, and help the formation of electric furnace foamy slag and stable, the content of CaO in the light dolomite is 50～55%, the effect that can play P, remove S.CaO/SiO in the present embodiment
2=2.5FeO:26%.
(d) tapping:
Present embodiment is at a
[o]=750～900ppm, temperature can be tapped in the time of 1620 ℃～1640 ℃.A wherein
[o]Employing is decided oxygen fast, carbometer is controlled.Wherein, P content is lower than 0.015%, and carbon content is 0.03～0.06%.
Higher mixed carbon comtent is to avoid or the low excessively basis of the clear carbon of minimizing in the present embodiment, and the clear carbon of suitable change helps to shorten the heat, reduce melting electric consumption, and the present invention controls mixed carbon comtent by the ratio of adjusting oxygen and carbon dust.For smelting low carbon steel series (carbon content is lower than 0.07%), change clear carbon and be controlled at 0.1%, as change clear carbon height, then control blowing oxygen quantity well according to decarbonization rate; As it is low to change clear carbon, reduces oxygen blast, to realize that end point carbon is between 0.03～0.04%.
Claims (6)
1. the end point controlling process of smelting low carbon steel in electric furnace may further comprise the steps successively:
(a) batching: select conventional mixed carbon raw material for use, make mixed carbon comtent be controlled at 1.0～1.8%;
(b) control C/O ratio:
Carbon-oxygen gun should keep its rifle head oblique cutting in slag, and from about the 30mm of molten bath, by fire door C-O rifle mechanical manipulator C/O is carried out following control:
In melting early stage, promptly temperature below 1520 ℃ the time, C/O=1: 2;
In melting mid-term, promptly temperature in the time of 1520 ℃～1580 ℃, C/O=1: 1;
In the melting later stage, promptly temperature more than 1580 ℃ the time, C/O=2: 1;
Wherein, the unit of C is kg/min, and the unit of O is NM
3/ min;
(c) typical composition of foamy slag is controlled to be: CaO/SiO
2=2.1～3.0, FeO:25%～30%;
(d) tapping: work as a
[o]=750～900ppm, temperature can be tapped in the time of 1620 ℃～1640 ℃;
All percentage ratios are weight percentage.
2. the end point controlling process of smelting low carbon steel in electric furnace according to claim 1, it is characterized in that: in described step (a), described mixed carbon comtent is 1.0～1.5%.
3. the end point controlling process of smelting low carbon steel in electric furnace according to claim 2, it is characterized in that: described mixed carbon comtent is 1.38%.
4. the end point controlling process of smelting low carbon steel in electric furnace according to claim 1, it is characterized in that: in described step (c), the typical composition of foamy slag is controlled to be: CaO/SiO
2=2.5, FeO:26%.
5. the end point controlling process of smelting low carbon steel in electric furnace according to claim 1, it is characterized in that: in described step (c), the typical composition of foamy slag is: CaO:36%, SiO
2: 17%, MgO:10%, MnO:5%, FeO:25%, Al
2O
3: 5%, P:0.5%, S:0.5%.
6. the end point controlling process of smelting low carbon steel in electric furnace according to claim 1, it is characterized in that: in described step (d), P content is lower than 0.015% during tapping, and carbon content is 0.03～0.06%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB02115094XA CN1203196C (en) | 2002-04-17 | 2002-04-17 | End point controlling process for smelting low carbon steel in electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB02115094XA CN1203196C (en) | 2002-04-17 | 2002-04-17 | End point controlling process for smelting low carbon steel in electric furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1451767A CN1451767A (en) | 2003-10-29 |
| CN1203196C true CN1203196C (en) | 2005-05-25 |
Family
ID=29220945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB02115094XA Expired - Fee Related CN1203196C (en) | 2002-04-17 | 2002-04-17 | End point controlling process for smelting low carbon steel in electric furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1203196C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100345992C (en) * | 2005-12-15 | 2007-10-31 | 广州珠江钢铁有限责任公司 | Technology of improving and stabilizing titanium recorery rate in titanium micro-alloyed high strength weether resistant sinelting and continuous casting process |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102127691B (en) * | 2011-02-21 | 2012-07-25 | 宁波钢铁有限公司 | Method for producing hot rolled steel coil |
| CN106244827B (en) * | 2016-09-05 | 2018-06-19 | 重庆大学 | A kind of smelting endpoint of smelting titanium slag with electric stove judges system and method |
| CN107419056A (en) * | 2017-07-28 | 2017-12-01 | 攀钢集团研究院有限公司 | Stainless steel EAF foaming slag and its application method |
-
2002
- 2002-04-17 CN CNB02115094XA patent/CN1203196C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100345992C (en) * | 2005-12-15 | 2007-10-31 | 广州珠江钢铁有限责任公司 | Technology of improving and stabilizing titanium recorery rate in titanium micro-alloyed high strength weether resistant sinelting and continuous casting process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1451767A (en) | 2003-10-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100363508C (en) | Electric furnace to converter steel making production process | |
| CN102424886B (en) | Furnace protection process for decarburization converter less slag splashing | |
| CN102080136B (en) | Converter smelting technique | |
| CN105525055B (en) | A kind of control method of converter less-slag melting carbon period splash | |
| CN109022675B (en) | Energy supply method by using chemical energy for smelting of full-scrap steel electric arc furnace | |
| CN107760823A (en) | A kind of quasi-continuous steelmaking system of steel scrap electric arc furnaces entirely and technique | |
| CN111647714A (en) | Smelting method for improving service life of electric furnace | |
| CN101660019A (en) | Electric furnace burden process with high efficiency and low cost | |
| CN1088112C (en) | Flux and process for forming slag of converter | |
| CN108754062A (en) | A kind of method of the interior gasification dephosphorization steel-making of converter steel slag hearth | |
| CN1195079C (en) | Method for smelting stainless steel with waste steel by frequency-conversion electric induction furnace | |
| CN1203196C (en) | End point controlling process for smelting low carbon steel in electric furnace | |
| CN1057134C (en) | Production method for medium- and low-carbon manganese iron | |
| CN1434133A (en) | Method for controlling rising splash slag in battom of converter | |
| CN111893247B (en) | Steelmaking method with high-efficiency refining function | |
| CN113337669B (en) | Method for strengthening electric furnace smelting by bottom blowing hydrogen | |
| CN100335669C (en) | Method for smelting phosphor-containing steel | |
| CN100335659C (en) | Smelting method of phosphorus containing steel | |
| KR100363608B1 (en) | Method of low-carbon ferromanganese(LCFeMn) manufacturing by recycling dust containing manganese | |
| CA2224039A1 (en) | Foamy slag process using multi-circuit lance | |
| CN114107599A (en) | Full scrap steel electric furnace smelting method | |
| CN106086287A (en) | Semi-steel making improves the method for aim carbon rear converter terminal residue adjustment | |
| JPS6063307A (en) | Converter steel making method of dead soft steel | |
| CN1223694A (en) | Method for making steel in a liquid melt-fed electric furnace | |
| CN111218538B (en) | Method for efficiently utilizing high-manganese pig iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050525 Termination date: 20140417 |