CN103555885B - A kind of method of molten steel being carried out to deoxidation and alloying in converter ladle - Google Patents
A kind of method of molten steel being carried out to deoxidation and alloying in converter ladle Download PDFInfo
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Abstract
A kind of method of carrying out alloying in ladle: converter smelting is also tapped; In ladle, add alloy element carry out component controlling; Molten steel surface in ladle adds basic powder; In ladle, carry out alloying: first will add the gross weight W of chemical element required in deoxidation and alloying, be not less than required for add chemical element gross weight W 50% basic powder mix; Again by inserting the injection tube in molten steel from the opening part alloy cap, apart from steel-making tundish lower curtate 200-350mm place, be blown into molten steel until alloying terminates with nitrogen or rare gas element; Leave standstill 3 ~ 5 minutes again, inclusion content in melting steel is fully floated and enters in covering slag; Conveniently carry out rear process operations.The present invention, by adding reductor and covering slag in ladle simultaneously, can improve deoxidation and alloying efficiency, improves yield of alloy at 5-8%, reduces inclusion content in melting steel content 25-30%, can also avoid burning loss of alloy.
Description
Technical field
The present invention relates to a kind of deoxidation and alloying of molten steel, belong to a kind of method of carrying out deoxidation and alloying in ladle particularly.
Background technology
Converter, in tapping process, for producing qualified steel product, needs to carry out component controlling to molten steel, and the iron alloy that required iron alloy total amount is consumed by deoxidation and iron alloy two portions that alloying needs form.And alloy addition does not calculate the consumption required for component controlling respectively at present, when considering deoxidation demand, calculate by experimental formula:
Alloy addition=(limitting %-terminal residual components % in steel grade specification) ÷ (the chemical element content % × chemical element recovery rate % of iron alloy) × molten steel amount (kg).
In actual production process, the oxygen level difference of each stove molten steel is comparatively large, and the alloy amount difference required for deoxidation reality is comparatively large, and above-mentioned method of calculation can not accurately calculate and determine alloy addition.
Secondly, in existing technique, also there is larger problem in iron alloy Adding Way, causes iron alloy oxidization burning loss, and foreign substance in molten steel increases.On-the-spot is generally all directly directly joined in ladle by feed hopper; alloy joins after in molten steel; due to proportion, comparatively molten steel is light; float on molten steel face very soon; like this, molten steel and alloy are all oxidized when not protecting, and deoxidation alloying operation forms a large amount of deoxidation products; remain in steel and just define inclusion, produce to rear operation and bring disadvantageous effect.
Simultaneously, oxygen content in steel depends on several factors, even if smelt same steel grade, because actual oxygen content is different, the alloy needed is also different, as " the converter molten steel peroxidation analysis of causes and harm " (Shandong metallurgical, the 31st volume the 4th phase) describe such, there is peroxidation phenomenon in segment converter, increases steel consumption and steel cost.
Summary of the invention
The present invention is directed to the deficiencies in the prior art; a kind of accurate calculation alloy element add-on is provided, and in adition process, carries out whole process protection, to improve yield of alloy; reduce inclusion content in melting steel content, improve the method for carrying out alloying in steel-making ladle of the cleanliness factor of molten steel.
Realize the measure of above-mentioned purpose:
A method for alloying is carried out, its step in ladle:
1) carry out converter smelting and tap;
2) tap complete, in ladle, add alloy element carry out component controlling, alloy element add-on method of calculation are as follows:
When adding a kind of alloy element and carry out deoxidation and alloying in ladle, its method of calculation:
A, conveniently, according to the steel oxygen content in water measured, the chemical equation utilizing this chemical element and steel water oxygen to react, calculates this chemical element and adds the percentage ratio that weight accounts for molten steel gross weight, use w
deoxidationrepresent;
B, according to steel grade to this chemical element setting content, add according to its requirement in alloying of following formulae discovery the percentage ratio accounting for molten steel gross weight, use w
alloyingrepresent, calculation formula:
W
alloying=(Q
1-Q
2)
In formula: W
alloying-required for alloying the weight percent of this chemical element, %
Q
1-be the intermediate value of this chemical element weight percent span in steel, unit: %;
Q
2-be this chemical element terminal residual weight degree in molten steel, unit: %;
C, to calculate in deoxidation alloying the gross weight of this chemical element required or the alloy containing this chemical element, represent with W, unit: kg;
W=(W
deoxidation+ W
alloying) ÷ η × W
molten steel
In formula: the gross weight of W-expression deoxidation and alloying this chemical element required, unit: kg;
W
molten steel-refer to molten steel gross weight, unit: kg;
η-represent that this chemical element adds fashionable in alloy mode, its weight percent content in the alloy, fashionable when adding for simple substance, then η=1;
When adding two kinds of (containing two kinds) above alloys and carry out the method for deoxidation and alloying in ladle, its method of calculation:
A) when adding multiple alloying element and carrying out deoxidation and alloying, first therefrom select the chemical element that deoxidation constant is minimum, and calculate according to the account form added when a kind of chemical element carries out deoxidation and alloying, use W respectively
1 deoxidationand W
1 alloyingrepresent;
B) calculate all the other element alloyed weight percentage added, use W respectively
2-in-1 aurification, W
n alloyingrepresent, and calculate all according to the following formula,
W
2-in-1 aurification=(Q
1-Q
2)
W
n alloying=(Q
1-Q
2)
In formula: W
2-in-1 aurification-the weight percentage of the second chemical element that adds required for alloying, %;
W
n alloying-the weight percentage of n-th kind of chemical element that adds required for alloying, %;
Q
1-be the intermediate value of this chemical component weight per-cent span in steel, unit: %;
Q
2-be this chemical composition terminal residual weight degree in molten steel, unit: %;
C) calculate the gross weight adding chemical element required in deoxidation and alloying, represent with W, unit: kg
W=(W
1 deoxidation÷ η
1+ W
1 alloying÷ η
1+ W
2-in-1 aurification÷ η
2+ ... W
n alloying÷ η
n) × W
molten steel;
η
1η
2η
nbe respectively the first, the second ..., in N, element adds fashionable in alloy mode, this element weight percent content in alloy, when chemical element add for simple substance time, η
1η
2η
nvalue is 1;
3) molten steel surface in ladle adds basic powder, controls basic powder thickness and is not less than 20mm;
4) in ladle, alloying is carried out: first will add the gross weight W of chemical element required in deoxidation and alloying, with be not less than required for add chemical element gross weight W 50% basic powder mix, and the particle diameter controlling alloy is at 0.075mm ~ 0.05mm; Again alloy cap is inserted in ladle, and make its lower edge and steel contacts; Injection tube with water-cooled and stirring-head is inserted in molten steel from the opening alloy cap, and controls stirring-head and be stuck in apart from steel-making tundish lower curtate 200-350mm place; Be more than 99.9% by purity, pressure is that the nitrogen of 0.6 ~ 0.8 MPa or rare gas element are blown into molten steel until alloying terminates by injection tube, flow control is at 5 ~ 15Nm
3 /minute, make in alloy cap, to be full of nitrogen or rare gas element, internal mask pressure projecting environment 0.005-0.01 MPa; Start alloy and basic powder mixture to input injection tube, and under the drive of nitrogen or rare gas element, be blown in molten steel, the stirring-head in injection tube also carries out stirring until alloying terminates, control stirring velocity at 3-6 cycle per minute clock; The nitrogen be blown into or inert gas flow control at 20 ~ 30Nm
3 /minute;
5), after chemical element and basic powder mixture add end, leave standstill 3 ~ 5 minutes, inclusion content in melting steel is fully floated and enters in covering slag;
6) conveniently rear process operations is carried out.
It is characterized in that: in alloying process, terminating and after sampling and analyzing, when steel oxygen content in water re-blows mode until meet the demands higher than adopting during controlling valu when being blown into chemical element.
The effect of master operation in the present invention
The present invention adds alloy element gross weight W by needing in deoxidation and alloying; with be not less than required for add 50% basic powder of alloy element gross weight W after mixing; by the injection tube with water-cooled; molten steel bottom is blown into rare gas element; add the mixture of reductor and basic powder; under the stirring of the stirring-head of injection tube; reductor and steel water oxygen react and generate deoxidation products; covering slag then melts and becomes liquid covering slag and float, and the rare gas element be blown into also forms a large amount of bubble and floats bottom molten steel.In this process, the protected slag of the inclusion wherein formed and rare gas element bubble absorb, and take in the covering slag of molten steel surface and remove, thus it is few to reach alloy dosage, efficiency is high, the removed object of more inclusiones;
The injection tube of band stirring-head and cooling tube is adopted in ladle, to be blown into through alloy cap nitrogen or the rare gas element that purity is 99.9% more than, its stirring-head controlling injection tube inserts the degree of depth of ladle at distance ladle bottom 200 ~ 350mm place, stirring velocity is 3 ~ 6 weeks/min, and make nitrogen or rare gas element overflow and be full of alloy cap, nitrogen in alloy cap or inert gas pressure are pressure-fired, higher than environmental stress 0.005 ~ 0.01 MPa; Its object can make molten steel be stirred fully exactly, and make molten steel component even, various inclusion floating is fast, and because alloy cap is by nitrogen or rare gas element sealing gland, enters without air, makes being mingled with less in molten steel, alleviates the removal of impurity burden of rear operation.
The present invention compared with prior art; by adding reductor and covering slag in ladle simultaneously; accurately can determine alloying element weight needed for deoxidation and alloying; improve deoxidation and alloying efficiency; improve yield of alloy 5-8%, reduce inclusion content in melting steel content 25-30%, the cleanliness factor of molten steel is largely increased; and greatly improve the accuracy of alloy addition, avoid burning loss of alloy.
Embodiment
Below the present invention is described in detail:
embodiment 1
Using silicon as the chemical element of deoxidation and alloying;
The final chemical composition of its steel grade setting that will smelt is: C:0.12 ~ 0.18%, Si:0.2 ~ 0.4%, Mn: ~ 1.0 ~ 1.6 %, P:0.04 ~ 009%, S≤0.015%;
The then Q of Si
1be 0.3%, adopt ferrosilicon as reductor material, it is siliceous is 50%;
According to composition setting, the Q of Si
2be 0.03%; Known W
molten steelbe 120000 kg;
Weight percent content according to the steel water oxygen measured is 0.026%, utilizes the chemical equation that iron alloy and steel water oxygen react, and calculates the silicon amount w required for deoxidation
deoxidationbe 0.0133%;
The step of alloying is carried out in ladle:
1) carry out converter smelting and tap;
2) in molten steel tapping process, add silicon and carry out deoxidation and alloying;
According to when adding a kind of alloy element and carry out deoxidation and alloying in ladle, its method of calculation: carry out following calculating:
A, conveniently, according to the steel oxygen content in water measured, the chemical equation utilizing alloy element and steel water oxygen to react, calculates it and adds the percentage ratio w accounting for molten steel gross weight required in deoxidation
deoxidationbe 0.0133%;
B, according to steel, content is set to silicon, according to following formulae discovery its in alloying required for add the percentage ratio accounting for molten steel gross weight, use w
alloyingrepresent, by Q
1be 0.3%, Q
2be the following calculation formula of 0.03% substitution:
W
alloying=(Q
1-Q
2)=0.3%-0.03%=0.27%
C, calculate in deoxidation and alloying, to need this element or the gross weight containing this mischmetal, represent with W, unit: kg; Again by w
deoxidationbe 0.0133%, w
alloying=0.27%, W
molten steel=120000 kg substitute into following formulae discovery, calculate
W=(W
deoxidation+ W
alloying) ÷ η × W
molten steel=(0.0133%+0.27%) ÷ 50% × 120000 kg=679.96 kg
3) molten steel surface in steel-making tundish adds basic powder, and basic powder thickness is 21mm;
4) steel-making tundish in carry out alloying: according to step 2) as calculated after, add basic powder according to should add alloy amount 75%, mix with ferrosilicon material, and make the particle diameter of basic powder at 0.075mm ~ 0.05mm; Again alloy cap is inserted in ladle, and make its lower edge and steel contacts; Injection tube with water-cooled and stirring-head is inserted in molten steel from the opening alloy cap, and controls stirring-head and be stuck in apart from steel-making tundish lower curtate 205mm place; Be 99.9% by purity, pressure is that the nitrogen of 0.6 MPa is blown into molten steel by injection tube, flow is 6Nm
3/ minute, make to be full of nitrogen in alloy cap, internal mask pressure projecting environment 0.0055 MPa; Start alloy and basic powder mixture to input injection tube, and under the drive of nitrogen, be blown in molten steel, the stirring-head in injection tube also carries out stirring until alloying terminates, and controls stirring velocity at 3 cycle per minute clocks; The pressure of the nitrogen be blown into is 0.6MPa, and flow control is at 22Nm
3/ minute, until alloying terminates;
5), after alloy and basic powder mixture add end, leave standstill 3 minutes, cause molten steel interalloy uniform composition, inclusion content in melting steel fully floats and enters in covering slag;
6) conveniently rear process operations is carried out.
The present embodiment calculates alloy dosage more accurately than prior art, improves steel alloying constituent hit rate, and lumber recovery improves 5%, and inclusion content in melting steel content reduces 32%.
Embodiment 2
Using manganese and silicon as the element carrying out deoxidation and alloying
The final chemical composition of its steel grade setting that will smelt is: C: ~ 0.06 ~ 0.12%, Si:0.35%, Mn:0.25 ~ 0.50%, P:0.04 ~ 009%, S≤0.015%; Steel oxygen content in water is 0.03%.
The then Q of Si
1be 0.35%, adopt siliceous be 50% ferrosilicon and containing manganese be that 75% ferromanganese is as deoxidation material;
According to composition setting, the Q of Si
1be 0.35 %, Q
2be the Q of 0.03%, Mn
1be 0.38%, Q
2be 0.15%;
Known W
molten steelfor 120000kg;
In silicon and manganese, the deoxidation constant of silicon is minimum, therefore it can be used as the account form according to adding when a kind of alloy element carries out deoxidation and alloying to calculate, and uses W respectively
1 deoxidationand W
1 alloyingrepresent;
Weight percent content according to the steel water oxygen measured is 0.03%, utilizes the chemical equation that iron alloy and steel water oxygen react, and calculates the silicon amount W required for deoxidation
1 deoxidationbe 0.014%;
The step of alloying is carried out in ladle:
1) carry out converter smelting and tap;
2) in molten steel tapping process, add deoxidizing alloying elements silicon and carry out deoxidation, add silicon and carry out alloying;
According to when adding a kind of alloy element and carry out deoxidation and alloying in ladle, its method of calculation: carry out following calculating:
When adopting silicomanganese to carry out deoxidation and alloying, because silicon is less than manganese deoxidation constant, so first calculate silicon add-on;
A) conveniently, according to the steel oxygen content in water measured, utilize the chemical equation that alloy element and steel water oxygen react, calculate silicon and required in deoxidation, add the percentage ratio W accounting for molten steel gross weight
1 deoxidationbe 0.014%;
B) according to steel, content is set to silicon, according to following formulae discovery its in alloying required for add the percentage ratio accounting for molten steel gross weight, use W
1 alloyingrepresent, by Q
1be 0.35%, Q
2be the following calculation formula of 0.03% substitution:
W
1 alloying=(Q
1-Q
2)=0.35%-0.03%=0.32%
C) calculate silicon total amount percentage ratio required in deoxidation and alloying, use W
siliconrepresent, unit: %; By W
1 deoxidationbe 0.014%, W
1 alloying=0.032%, W
molten steelbe that 120000 kg substitute into following formulae discovery respectively:
W
silicon=(W
1 deoxidation+ W
1 alloying)=0.014%+0.32%=0.334 %
According to the consumption percentage ratio of following formulae discovery manganese when alloying, use W
2-in-1 aurification, by the Q of manganese
1be 0.38%, Q
2be 0.15% substitution:
W
2-in-1 aurification=(Q
1-Q
2)=0.38%-0.15%=0.23%
According to the gross weight of following formulae discovery required silicon and manganese in deoxidation and alloying, with W, unit is kg:
W=(W
1 deoxidation÷ η
1+ W
1 alloying÷ η
1+ W
2-in-1 aurification÷ η
2) × W
molten steel=(0.014% ÷ 50%+0.32% ÷ 50%+0.23% ÷ 75%) × 120000kg=1169.5 kg
3) molten steel surface in steel-making tundish adds basic powder, and basic powder thickness is 20mm;
4) steel-making tundish in carry out alloying: according to step 2) as calculated after, basic powder is added according to 100% of the silicon that should add and manganese alloy total amount, it is mixed with silicomanganese material, and makes the particle diameter of basic powder at 0.075mm ~ 0.05mm; Again alloy cap is inserted in ladle, and make its lower edge and steel contacts; Injection tube with water-cooled and stirring-head is inserted in molten steel from the opening alloy cap, and controls stirring-head and be stuck in apart from steel-making tundish lower curtate 205mm place; Be 99.9% by purity, pressure is that the nitrogen of 0.75 MPa is blown into molten steel by injection tube, flow is 12Nm
3/ minute, make to be full of nitrogen in alloy cap, internal mask pressure projecting environment 0.009 MPa; Start alloy and basic powder mixture to input injection tube, and under the drive of nitrogen, be blown in molten steel, the stirring-head in injection tube also carries out stirring until alloying terminates, and controls stirring velocity at 5 cycle per minute clocks; The pressure of the nitrogen be blown into is 0.75MPa, and flow control is at 28Nm
3/ minute, until alloying terminates;
5), after alloy and basic powder mixture add end, leave standstill 5 minutes, cause molten steel interalloy uniform composition, inclusion content in melting steel fully floats and enters in covering slag;
6) conveniently rear process operations is carried out.
The present embodiment calculates alloy dosage more accurately than prior art, and lumber recovery improves 6%, improves steel alloying constituent hit rate inclusion content in melting steel content and reduces 33%.
Embodiment 3
The element of deoxidation and alloying is carried out with aluminium, silicon, manganese
The final chemical composition of its steel grade setting that will smelt is: C:0.050%-0.090%, Si:0.15%, Mn:1.00%-1.50%, P <0.013%, S<0.003% Als:0.04%-0.05%
The then Q of Si
1be 0.15%, adopt siliceous be 50% ferrosilicon and containing manganese be that 75% ferromanganese is as deoxidation material; Aluminium adopts fine aluminium.
According to composition setting, the Q of Al
1be 0.045 %, Q
2be 0; The Q of Si
1be 0.15 %, Q
2be 0.03%; The Q of Mn
1be 1.25%, Q
2be 0.15%;
Known W
molten steelfor 120000kg;
The step of alloying is carried out in ladle:
1) carry out converter smelting and tap;
2) in molten steel tapping process, add deoxidizing alloying elements aluminium, silicon, manganese carries out deoxidation alloying;
According to when adding a kind of alloy element and carry out deoxidation and alloying in ladle, its method of calculation: carry out following calculating:
In aluminium, silicon and manganese, the deoxidation constant of aluminium is minimum, therefore it can be used as the account form according to adding when a kind of alloy element carries out deoxidation and alloying to calculate, and uses W respectively
1 deoxidationand W
1 alloyingrepresent;
A) conveniently, according to the steel oxygen content in water measured, utilize the chemical equation that aluminium and steel water oxygen react, calculate aluminium and required in deoxidation, add the percentage ratio W accounting for molten steel gross weight
1 deoxidationbe 0.067%;
B) according to steel, content is set to aluminium, according to following formulae discovery its in alloying required for add the percentage ratio accounting for molten steel gross weight, use W
1 alloyingrepresent, by Q
1be 0.045%, Q
2be the following calculation formula of 0 substitution:
W
1 alloying=(Q
1-Q
2)=0.045%-0=0.045%
Calculate the total amount percentage ratio that silicon is required in alloying, use W
2-in-1 aurificationrepresent, unit: %; By Q
1be 0.15 %, Q
2be 0.03%
Substitute into
W
2-in-1 aurification=(Q
1-Q
2)=0.15%-0.03%=0.12 %
According to the consumption percentage ratio of following formulae discovery manganese when alloying, use W
3 alloyings, by the Q of manganese
1be 1.25%, Q
2it is 0.15% substitution
W
3 alloyings=(Q
1-Q
2)=1.25%-0.15%=1.1%
According to following formulae discovery required silicon, manganese raw material separately and gross weight used of aluminium in deoxidation and alloying, represent with W, unit is kg:
W=(W
1 deoxidation÷ η
1+ W
1 alloying÷ η
1+ W
2-in-1 aurification÷ η
2+ W
3 alloyings÷ η
3) × W
molten steel=(0.067%+0.045%+0.12% ÷ 50%+1.1% ÷ 75%) × 120000kg=(0.067%+0.045%+0.24%+1.47%) × 120000kg=2186.4 kg
3) molten steel surface in steel-making tundish adds basic powder, and basic powder thickness is 20mm;
4) steel-making tundish in carry out alloying: according to step 2) as calculated after, basic powder is added according to 60% of the aluminium that should add, silicon and manganese alloy total amount, it is mixed with silicomanganese material, and makes the particle diameter of basic powder at 0.075mm ~ 0.05mm; Again alloy cap is inserted in ladle, and make its lower edge and steel contacts; Injection tube with water-cooled and stirring-head is inserted in molten steel from the opening alloy cap, and controls stirring-head and be stuck in apart from steel-making tundish lower curtate 205mm place; Be 99.9% by purity, pressure is that the nitrogen of 0.75 MPa is blown into molten steel by injection tube, flow is 12Nm
3/ minute, make to be full of nitrogen in alloy cap, internal mask pressure projecting environment 0.009 MPa; Start alloy and basic powder mixture to input injection tube, and under the drive of nitrogen, be blown in molten steel, the stirring-head in injection tube also carries out stirring until alloying terminates, and controls stirring velocity at 5 cycle per minute clocks; The pressure of the nitrogen be blown into is 0.75MPa, and flow control is at 28Nm
3/ minute, until alloying terminates;
5), after alloy and basic powder mixture add end, leave standstill 5 minutes, cause molten steel interalloy uniform composition, inclusion content in melting steel fully floats and enters in covering slag;
6) conveniently rear process operations is carried out.
The present invention compared with prior art; by adding reductor and covering slag in ladle simultaneously; accurately can determine alloying element weight needed for deoxidation and alloying; improve deoxidation and alloying efficiency; improve yield of alloy 5-8%, reduce inclusion content in melting steel content 25-30%, the cleanliness factor of molten steel is largely increased; and greatly improve the accuracy of alloy addition, avoid burning loss of alloy.
Above-described embodiment is only the best and exemplifies, and is not the restriction to embodiments of the present invention.
Claims (2)
1. molten steel is carried out to a method for deoxidation and alloying in converter ladle, its step:
1) carry out converter smelting and tap;
2) tap complete, in ladle, add alloy element carry out component controlling, alloy element add-on method of calculation are as follows:
When adding a kind of alloy element and carry out deoxidation and alloying in ladle, its method of calculation:
A, conveniently, according to the steel oxygen content in water measured, the chemical equation utilizing this chemical element and steel water oxygen to react, calculates this chemical element and adds the percentage ratio that weight accounts for molten steel gross weight, use w
deoxidationrepresent;
B, according to steel grade to this chemical element setting content, add according to its requirement in alloying of following formulae discovery the percentage ratio accounting for molten steel gross weight, use w
alloyingrepresent, calculation formula:
W
alloying=(Q
1-Q
2)
In formula: W
alloying-required for alloying the weight percent of this chemical element, %
Q
1-be the intermediate value of this chemical element weight percent span in steel, unit: %;
Q
2-be this chemical element terminal residual weight degree in molten steel, unit: %;
C, to calculate in deoxidation alloying the gross weight of this chemical element required or the alloy containing this chemical element, represent with W, unit: kg;
W=(W
deoxidation+ W
alloying) ÷ η × W
molten steel
In formula: the gross weight of W-expression deoxidation and alloying this chemical element required, unit: kg;
W
molten steel-refer to molten steel gross weight, unit: kg;
η-represent that this chemical element adds fashionable in alloy mode, its weight percent content in the alloy, fashionable when adding for simple substance, then η=1;
When adding two or more alloy and carry out the method for deoxidation and alloying in ladle, its method of calculation:
A) when adding multiple alloying element and carrying out deoxidation and alloying, first therefrom select the chemical element that deoxidation constant is minimum, and calculate according to the account form added when a kind of chemical element carries out deoxidation and alloying, use W respectively
1 deoxidationand W
1 alloyingrepresent;
B) calculate all the other element alloyed weight percentage added, use W respectively
2-in-1 aurification, W
n alloyingrepresent, and calculate all according to the following formula,
W
2-in-1 aurification=(Q
1-Q
2)
W
n alloying=(Q
1-Q
2)
In formula: W
2-in-1 aurification-the weight percentage of the second chemical element that adds required for alloying, %;
W
n alloying-the weight percentage of n-th kind of chemical element that adds required for alloying, %;
Q
1-be the intermediate value of this chemical component weight per-cent span in steel, unit: %;
Q
2-be this chemical composition terminal residual weight degree in molten steel, unit: %;
C) calculate the gross weight adding chemical element required in deoxidation and alloying, represent with W, unit: kg
W=(W
1 deoxidation÷ η
1+ W
1 alloying÷ η
1+ W
2-in-1 aurification÷ η
2+ ... W
n alloying÷ η
n) × W
molten steel;
η
1η
2η
nbe respectively the first, the second ..., in N, element adds fashionable in alloy mode, this element weight percent content in alloy, when chemical element add for simple substance time, η
1η
2η
nvalue is 1;
3) molten steel surface in ladle adds basic powder, controls basic powder thickness at 20 ~ 21mm;
4) in ladle, alloying is carried out: first will add the gross weight W of chemical element required in deoxidation and alloying, with be not less than required for add chemical element gross weight W 50% basic powder mix, and the particle diameter controlling alloy is at 0.075mm ~ 0.05mm; Again alloy cap is inserted in ladle, and make its lower edge and steel contacts; Injection tube with water-cooled and stirring-head is inserted in molten steel from the opening alloy cap, and controls stirring-head and be stuck in apart from steel-making tundish bottom 200-350mm place; Be more than 99.9% by purity, pressure is that the nitrogen of 0.6 ~ 0.8 MPa or rare gas element are blown into molten steel until alloying terminates by injection tube, flow control is at 5 ~ 15Nm
3 /minute, make in alloy cap, to be full of nitrogen or rare gas element, internal mask pressure projecting environment 0.005-0.01 MPa; Start alloy and basic powder mixture to input injection tube, and under the drive of nitrogen or rare gas element, be blown in molten steel, the stirring-head in injection tube also carries out stirring until alloying terminates, control stirring velocity at 3-6 cycle per minute clock; The nitrogen be blown into or inert gas flow control at 20 ~ 30Nm
3 /minute;
5), after chemical element and basic powder mixture add end, leave standstill 3 ~ 5 minutes, inclusion content in melting steel is fully floated and enters in covering slag;
6) conveniently rear process operations is carried out.
2. a kind of method of molten steel being carried out to deoxidation and alloying in converter ladle as claimed in claim 1, it is characterized in that: in alloying process, to terminate and after sampling and analyzing, when steel oxygen content in water re-blows mode until meet the demands higher than adopting during controlling valu when being blown into chemical element.
Priority Applications (1)
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| CN101392303A (en) * | 2008-08-05 | 2009-03-25 | 山东石横特钢集团有限公司 | Recovery and utilization method of useful element in free-cutting steel refining slag |
| CN101875995A (en) * | 2009-11-20 | 2010-11-03 | 武汉钢铁(集团)公司 | Method for deoxidizing and alloying molten steel |
| CN102978505A (en) * | 2012-11-20 | 2013-03-20 | 首钢总公司 | Smelting method of high-strength IF steel |
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| CN101392303A (en) * | 2008-08-05 | 2009-03-25 | 山东石横特钢集团有限公司 | Recovery and utilization method of useful element in free-cutting steel refining slag |
| CN101875995A (en) * | 2009-11-20 | 2010-11-03 | 武汉钢铁(集团)公司 | Method for deoxidizing and alloying molten steel |
| CN102978505A (en) * | 2012-11-20 | 2013-03-20 | 首钢总公司 | Smelting method of high-strength IF steel |
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