CN102776320A - Carbon control method for hard wire steel-wire steel smelting - Google Patents
Carbon control method for hard wire steel-wire steel smelting Download PDFInfo
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- CN102776320A CN102776320A CN2011101238757A CN201110123875A CN102776320A CN 102776320 A CN102776320 A CN 102776320A CN 2011101238757 A CN2011101238757 A CN 2011101238757A CN 201110123875 A CN201110123875 A CN 201110123875A CN 102776320 A CN102776320 A CN 102776320A
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Abstract
The invention provides a carbon control method for hard wire steel-wire steel smelting. Taking 70t of direct current electric arc furnace smelt 82B steel as an example, the method comprises: maintaining the current strength at 70-90kA at an initial smelting stage and oxygen supply intensity at 1.0-1.2m<3>/t.min; blowing carbon powder into the furnace by a second gear during a melting stage, and after slagging and foaming, blowing carbon powder into the furnace by shifting to a third gear so as to form automatic flow for deslagging; continuing slagging and deslagging, and when the P content of the molten steel is less than or equal to 0.012%, entering an oxidation stage, maintaining the third gear for carbon powder blowing, and after foaming of foaming slag, reducing the gear to the first or second gear for carbon powder blowing, then at a later oxidation stage, carrying out steel tapping when the temperature reaches over 1620DEG C and the carbon is up to 0.60-0.75%. Charging of the electric furnace is carried out according to formula of: Qcast/kg=[Qaccessories/t(Caccessories/%-Creturns/%)+Qimpure iron/t(Creturns/%-Cimpure iron/%)]/(Cmolten iron/%-Creturns/%). The total loading amount is 80-90t, wherein 40t of molten iron, 6500kg of lime, and 1800kg of dolomite are added. The carbon powder blowing amount of the electric furnace falls into 3 gears: the first gear is 15-18kg/min, the second gear is 30-35kg/min, and the third gear is 50-60kg/min. The slag basicity is controlled at 2.5-3.2, and the MgO content in the slag is greater than or equal to 10%.
Description
Technical field
The present invention relates to the smelting of compressor wire, especially,, can effectively ensure output of steel and quality the control of electrosmelting end point carbon to the steel of using of 82B with steel.
Background technology
Compressor wire belongs to high carbon steel series with steel (82B); It is production HS, low relaxed prestress concrete structure main raw material with steel wire and steel strand; Product after deep processing is widely used in engineering fields such as Highrise buildings, bridge, petrochemical complex and railway, belongs to the rigid line product of high-tech content, high added value.
Concerning high carbon steel, because the fusing point of carbon is low, the choosing that steel takes place in process of setting divides crystallization; Very easily produce the C segregation; If a large amount of carburetting in steel have not only aggravated the segregation degree of carbon but also have introduced inclusion in the smelting later stage, reduced the purity of molten steel, in the operation of rolling, being prone to produce the netted C of oozing body, martensite etc. influences the abnormal structure of drawing or causes inclusion rank height in the stocking; Cause steel brittle failure in drawing process, this is a part that prestressing steel is avoided.
Literature search discloses: compressor wire with the production status of steel (82B) routine is at present: generally in the electrosmelting process for removing harmful element phosphorus, sulphur, carrying out strong oxygen-supply operation; Earlier with the harmful element oxidation; But carbon is also oxidized in the time of the oxidation harmful element; When phosphorus, when sulphur can meet the demands, the only surplus trace of the carbon content of molten steel; In order to satisfy the carbon content requirement of high carbon steel, in refining process, drop into a large amount of carburelants (like carbon dust etc.) and replenish, cause the time of the diffusion of carbon to shorten relatively, the homogeneity of molten steel is affected and introduces a large amount of inclusiones, causes carbon segregation to strengthen.
Smelting process to the 82B steel provided by the invention guarantees that the height of molten steel stays the carbon amount, promptly stays the carbon amount to be controlled at 0.60-0.70%; The not carburetting or the carbon that reduces in the LF refining process neither change smelting cycle to reach, and have competent time and temperature to guarantee the even diffused of carbon in the molten steel again and solve because of adding the Inclusion Problem that carburelant is brought into; To reduce the segregation of carbon, guarantee the demand of the deep processing performance of steel.
Summary of the invention
The objective of the invention is to: the smelting of rigid line steel wire steel and the control method of carbon are provided, make electrosmelting guarantee that the height of molten steel stays the carbon amount at 0.60-0.75%, reduce the segregation of carbon, guarantee that the deep processing performance of steel meets the demands.
The objective of the invention is to realize like this: a kind of control method of rigid line steel wire smelting steel carbon is an example with 70t ton direct current electric arc furnace smelting 82 B steel; Smelting initial stage holding current intensity is 70-90kA; Oxygen supply intensity is 1.0-1.2m
3/ t.min; The phase of dissolving is with the 2 gears carbon dust of in stove, jetting, and treats to use instead after slag making is bubbled the 3 gears carbon dust of in stove, jetting, to form the gravity flow deslagging; Continue the slag making deslagging, treat in the molten steel P content≤0.012% o'clock to get into oxidation period; Keep 3 grades of winding-up carbon dusts, be kept to 1 grade or 2 grades of winding-up carbon dusts after foamy slag bubbles, in later stage oxidation period; When temperature reaches more than 1620 ℃, when carbon reaches 0.60-0.75%, can tap;
Feed intake by calculation formula:
Q gives birth to=[Q joins (C join-C return)+Q assorted (C return-C is assorted)]/(C life-C returns)
Q gives birth to: pig iron kg;
Q joins: batching 80-90t;
Q is assorted: assorted iron 10-15t;
C joins: the carbon content 1.60-1.70% of batching;
C returns: the carbon content 0.25-0.30% of steel scrap;
C is assorted: the carbon content 0.10-0.15% of assorted iron;
C gives birth to: molten iron or iron block carbon content 3.0-3.5%;
The inventory of above-mentioned electric furnace is the 80-90 ton, wherein adds 40 tons of molten iron, lime 6500kg, and rhombspar 1800kg adds in the first blue material;
Above-mentioned electric furnace winding-up carbon dust amount is divided into 3 gears: 1 grade is 15-18kg/min, and 2 grades is 30-35kg/min, and 3 grades is 50-60kg/min;
The used carbon dust of the slag making of above-mentioned electric furnace adopts the charring furnace technology to produce, contain fixed carbon greater than 86%, granularity is less than 3mm.
Described control method, the control basicity of slag is 2.5-3.2, MgO content >=10% in the slag.
Described control method, choices of raw materials is the commercially available prod.
Theoretical foundation of the present invention: according to molecular motion-theory of Brownian motion: particle is done irregular motion in colloidal medium; The speed of its motion depends on the viscosity of size, temperature and the medium of particle; The inevitable diffusion phenomena that in colloidal medium, show of the result of its motion; Be particle can be spontaneously from the concentration eminence to the diffusion of concentration lower, particle can satisfy following relation: S between average displacement S and the spread coefficient of t in the time
2=2k*t; Wherein k is a spread coefficient: K=(R/6N
0* * T π * η * r); R is the thermodynamic equilibrium constant of medium, N
0Be the A Fujiadeluo constant, η is the viscosity constant of medium, and r is particle radii, and T is a medium temperature.The inventive method keeps the higher carbon amount of staying under the prerequisite of the effective elimination that guarantees phosphorus, sulphur; Add through alloy refining period; On the basis that does not add or add less carbon dust, the carbon content of molten steel is finely tuned; Guaranteed diffusion time, neither changed smelting cycle, had competent time and temperature to guarantee the purpose of the even diffused of carbon in the molten steel again thereby reach.
In addition, in the electrosmelting process, steel liquid deoxidation and oxygenation process exist simultaneously, and deoxidation mainly is to rely on the C-O reaction to generate the CO bubble, [O] in the molten steel taken out of and reach the purpose of deoxidation with this; In deoxidation process, the molten steel decarbonization rate is directly proportional with deoxidation speed, so when carbon content is high in the molten steel; Reaction between carbon and oxygen is strong; The molten bath produces a large amount of CO bubbles with the oxygen removal in the molten steel, wants effectively to reduce the oxygen level of molten steel, and this just requires furnace charge to want height to join carbon; So that have more C-O reaction to produce, thereby effectively reduce the oxygen level in the molten steel.
The present invention conceives scientific and reasonable; Distribution has one's own knack; Can satisfy as 82B high-carbon wire rod production technique:
strand C segregation little, steel homogeneous microstructure, performance stable; O/N content＜the 50/80PPm of
finished product wire rod;
is mingled with low; Even the not carburetting or the carbon that reduces in the LF refining process; Neither change smelting cycle to reach; There are competent time and temperature to guarantee the even diffused of carbon in the molten steel again and solve because of adding the Inclusion Problem that carburelant is brought into; To reduce carbon segregation and effectively to reduce the oxygen level in the molten steel, its production demonstration effect is splendid, shows technical progress.
Description of drawings
The present invention contrasts accompanying drawing and is described further.
Accompanying drawing 1 stays carbon amount and steel sorbite ratio corresponding relation graphic representation for electric furnace;
As shown in the figure: as to stay carbon amount and steel sorbite ratio to be the positive line sexual intercourse.
Accompanying drawing 2 stays carbon amount and steel oxygen level corresponding relation graphic representation for electric furnace;
As shown in the figure: as to stay carbon amount and steel oxygen level to be the reverse linear relation.
Embodiment
Control Example of the present invention is described further.
Embodiment
The electric furnace operation: with 70t ton direct current electric arc furnace is example: in the electrosmelting operation, with addition of 40 tons molten iron (if the molten iron insufficient section can suitably be added iron block), calculation formula is following in the electric furnace batching:
Q gives birth to=[Q joins (C join-C return)+Q assorted (C return-C is assorted)]/(C life-C returns)
The inventory of example 1. electric furnaces is at 80 tons, and joining carbon content is 1.60%, and assorted iron is with addition of amount 10t; Carbon content in the assorted iron is 0.10%; Home scrap is selected the cleaning steel scrap that weight is arranged in pairs or groups, foreign matter content is few for use, and the carbon content in the home scrap is 0.25%, and molten iron or iron block carbon content are 3.0%; Then lime adding amount is 6300kg, and rhombspar add-on 1600kg adds in the first blue material;
Q gives birth to (t)=[80 x (1.60%-0.25%)+10 x (0.25%-0.10%)]/(3.0%-0.25%)=39.8 (t)
That is: molten iron (if the molten iron insufficient section can suitably be added iron block) is 39.8 tons with addition of amount.
The inventory of example 2. electric furnaces is at 85 tons, and joining carbon content is 1.65%, and assorted iron is with addition of amount 10t; Carbon content in the assorted iron is 0.15%; Home scrap is selected the cleaning steel scrap that weight is arranged in pairs or groups, foreign matter content is few for use, and the carbon content in the home scrap is 0.3%, and molten iron or iron block carbon content are 3.25%; Then lime adding amount is 6500kg, and rhombspar add-on 1800kg adds in the first blue material;
Q gives birth to (t)=[85 x (1.65%-0.3%)+10 x (0.30%-0.15%)]/(3.25%-0.3%)=36.5 (t)
That is: molten iron (if the molten iron insufficient section can suitably be added iron block) is 36.5 tons with addition of amount.
The inventory of example 3. electric furnaces is at 90 tons, and joining carbon content is 1.70%, and assorted iron is with addition of amount 15t; Carbon content in the assorted iron is 0.15%; Home scrap is selected the cleaning steel scrap that weight is arranged in pairs or groups, foreign matter content is few for use, and the carbon content in the home scrap is 0.3%, and molten iron or iron block carbon content are 3.5%; Then lime adding amount is 6700kg, and rhombspar add-on 2000kg adds in the first blue material;
Q gives birth to (t)=[90 x (1.70%-0.3%)+15 x (0.30%-0.15%)]/(3.5%-0.3%)=40.08 (t)
That is: molten iron (if the molten iron insufficient section can suitably be added iron block) is 40.08 tons with addition of amount.
The smelting initial stage adopts high tap position to send electricity, and keeping its strength of current is 85kA; Its oxygen supply intensity is 1.2m
3/ t.min; The phase of dissolving is with the 2 gears carbon dust of in stove, jetting; Treat to use instead after slag making is bubbled the 3 gears carbon dust of in stove, jetting; (spray carbon flow gear is established 3 grades: 1 grade is 18kg/min; 2 grades is 35kg/min, and 3 grades for 60kg/min) the carbon dust making foamed slag of jetting (carbon dust requires: adopt the charring furnace technology to produce, contain fixed carbon greater than 86%, granularity is less than 3mm); Confirm the slag making situation according to the viscosity of foamy slag, in theory foamy slag basicity (R=CaO/SiO
2) generally be controlled at 3.2, so that FeO is reduced to minimum to the influence degree of foamy slag, and require MgO content>=10% in the slag; Erosion to alleviate anti-material (if MgO content is low excessively in the slag, reduces slag fluidity, can't form foamy slag; Too high, bits are done, and also can't form foamy slag); The adjustment foamy slag keeps good mobility, is convenient to the deslagging that flows automatically; Continue the slag making deslagging, treat in the molten steel to get into oxidation period behind P content≤0.012%; Keep foamy slag, after the thermometric sampling, keep 3 grades of spray carbon; Be kept to 1 grade or 2 grades of winding-up carbon dusts after foamy slag bubbles, can effectively remove harmful element like this, guarantee high carbon content in the molten steel; See table 1.
Numeral is learnt from table: stay the increase of carbon amount with electric furnace, steel sorbite content obviously improves, and the steel oxygen level obviously reduces; Under identical controlled rolling condition, height stays in the steel tissue of carbon also not that the existing network shape oozes abnormal structures such as C body or martensite.
The present invention can be applied to the steel grade of electric furnace or converter production carbon content >=0.70%, should keep higher relatively C content in the molten steel before the refining; Utilize this method, under no vacuum apparatus treatment condition, neither change smelting cycle, have competent time and temperature to guarantee the even diffused of carbon in the molten steel again, can produce the hard wire steel that meets user's needs equally.
Claims (3)
1. the control method of a rigid line steel wire smelting steel carbon, it is characterized in that: with 70t ton direct current electric arc furnace smelting 82 B steel is example; Smelting initial stage holding current intensity is 70-90kA; Oxygen supply intensity is 1.0-1.2m
3/ t.min; The phase of dissolving is with the 2 gears carbon dust of in stove, jetting, and treats to use instead after slag making is bubbled the 3 gears carbon dust of in stove, jetting, to form the gravity flow deslagging; Continue the slag making deslagging, treat in the molten steel P content≤0.012% o'clock to get into oxidation period; Keep 3 grades of winding-up carbon dusts, be kept to 1 grade or 2 grades of winding-up carbon dusts after foamy slag bubbles, in later stage oxidation period; When temperature reaches more than 1620 ℃, when carbon reaches 0.60-0.75%, can tap;
Feed intake by calculation formula:
Q gives birth to=[Q joins (C join-C return)+Q assorted (C return-C is assorted)]/(C life-C returns)
Q gives birth to: pig iron kg;
Q joins: batching 80-90t;
Q is assorted: assorted iron 10-15t;
C joins: the carbon content 1.60-1.70% of batching;
C returns: the carbon content 0.25-0.30% of steel scrap;
C is assorted: the carbon content 0.10-0.15% of assorted iron;
C gives birth to: molten iron or iron block carbon content 3.0-3.5%;
The inventory of above-mentioned electric furnace is the 80-90 ton, wherein adds 40 tons of molten iron, lime 6500kg, and rhombspar 1800kg adds in the first blue material;
Above-mentioned electric furnace winding-up carbon dust amount is divided into 3 gears: 1 grade is 15-18kg/min, and 2 grades is 30-35kg/min, and 3 grades is 50-60kg/min;
The used carbon dust of the slag making of above-mentioned electric furnace adopts the charring furnace technology to produce, contain fixed carbon greater than 86%, granularity is less than 3mm.
2. control method according to claim 1 is characterized in that: the control basicity of slag is 2.5-3.2, MgO content >=10% in the slag.
3. control method according to claim 1, it is characterized in that: choices of raw materials is the commercially available prod.
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| CN2011101238757A CN102776320A (en) | 2011-05-13 | 2011-05-13 | Carbon control method for hard wire steel-wire steel smelting |
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| CN2011101238757A CN102776320A (en) | 2011-05-13 | 2011-05-13 | Carbon control method for hard wire steel-wire steel smelting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116479210A (en) * | 2023-03-19 | 2023-07-25 | 新疆八一钢铁股份有限公司 | Composite carbureting method for smelting medium-high carbon steel in converter |
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| CN1584096A (en) * | 2004-06-11 | 2005-02-23 | 宝钢集团上海五钢有限公司 | Production of clean high carbon chromic bearing steel |
| CN1629323A (en) * | 2004-08-14 | 2005-06-22 | 新疆八一钢铁股份有限公司 | Electric furnace high voltage and large oxygen quantity foam slag smelting method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116479210A (en) * | 2023-03-19 | 2023-07-25 | 新疆八一钢铁股份有限公司 | Composite carbureting method for smelting medium-high carbon steel in converter |
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Application publication date: 20121114 |