CN103555885A - Method for deoxidizing and alloying molten steel in converter steel ladle - Google Patents
Method for deoxidizing and alloying molten steel in converter steel ladle Download PDFInfo
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Abstract
The invention relates to a method for alloying in a steel ladle. The method comprises the following steps of: smelting in a converter and tapping; adding alloying elements in the steel ladle for deoxidizing and alloying; adding alkaline covering slag on the surface of molten steel in the steel ladle; alloying in the steel ladle, comprising uniformly mixing chemical elements with the total weight of W required during deoxidizing and alloying with alkaline covering slag not less than 50% of the total weight W of the added chemical elements, inserting a blow pipe into the molten steel through an opening on an alloy cover, at the place 200-350mm away from the lower part of the steel-making tundish, blowing molten steel with nitrogen or inert gas until alloying is finished; standing for 3-5 minutes so that occluded substances in the molten steel float completely and enter the covering slag; and carrying out regular subsequent operation. By adding deoxidizer and covering slag in the molten steel, the deoxidizing and alloying efficiency can be improved, the alloy yield is improved by 5-8%, occluded substances in the molten steel can be reduced by 25-30%, and burning loss of alloy can be avoided.
Description
Technical field
The present invention relates to a kind of deoxidation and alloying of molten steel, belong to particularly a kind of method of carrying out deoxidation and alloying in ladle.
Background technology
Converter, in tapping process, for producing qualified steel product, need to be carried out component controlling to molten steel, and iron alloy two portions that the iron alloy that needed iron alloy total amount is consumed by deoxidation and alloying need form.And alloy addition does not calculate respectively the needed consumption of component controlling at present, consider in the absence of deoxidation demand, by experimental formula, calculate:
Alloy addition=(limitting the remaining composition % of %-terminal in steel grade specification) ÷ (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 larger, and the actual needed alloy amount of deoxidation differs larger, and above-mentioned method of calculation can not accurately be calculated and definite alloy addition.
Secondly, in existing technique, iron alloy adds method also to have larger problem, causes iron alloy oxidization burning loss, and foreign substance in molten steel increases.Scene is all generally directly by feed hopper, directly to join in ladle; after alloy joins in molten steel; because proportion is light compared with molten steel; float over very soon on molten steel face; like this, molten steel and alloy are all oxidized in the situation that not protecting, and deoxidation alloying operation forms a large amount of deoxidation productss; remain in steel and just formed 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 needing is also different, as described in the peroxidation analysis of causes of < < converter molten steel and harm > > (Shandong is metallurgical, the 31st the 4th phase of volume), 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 molten steel cleanliness factor in steel-making ladle, carry out the method for alloying.
Realize the measure of above-mentioned purpose:
In ladle, carry out a method for alloying, its step:
1) carry out converter smelting tapping;
2) tap completely, in ladle, add alloy element to carry out component controlling, alloy element add-on method of calculation are as follows:
When adding a kind of alloy element to carry out deoxidation and alloying in ladle, its method of calculation:
A, according to routine, the steel oxygen content in water according to measuring, utilizes this chemical element and the chemical equation that steel water oxygen reacts, and calculates this chemical element and adds weight to account for the percentage ratio of molten steel gross weight, uses w
deoxidationrepresent;
B, according to steel grade, this chemical element is set to content, according to following formula, calculate its requirement in alloying and add the percentage ratio that accounts for molten steel gross weight, use w
alloyingrepresent calculation formula:
W
alloying=(Q
1-Q
2)
In formula: W
alloying-be the weight percent of required this chemical element of alloying, %
Q
1-be the intermediate value of this chemical element weight percent span in steel, unit: %;
Q
2-be the remaining weight percent content of this chemical element terminal in molten steel, unit: %;
The gross weight of C, the alloy that calculates in deoxidation alloying required this chemical element or contain this chemical element, represents unit: kg with W;
W=(W
deoxidation+ W
alloying) ÷ η * W
molten steel
In formula: the gross weight of required this chemical element of W-expression deoxidation and alloying, unit: kg;
W
molten steel-refer to molten steel gross weight, unit: kg;
η-represent that this chemical element adds in alloy mode is fashionable, and its weight percent content in alloy is fashionable when adding for simple substance, η=1;
When adding two kinds of (containing two kinds) above alloys to carry out the method for deoxidation and alloying, its method of calculation in ladle:
A) when adding multiple alloying element to carry out deoxidation and alloying, first therefrom select the chemical element of deoxidation constant minimum, and the account form when adding a kind of chemical element to carry out deoxidation and alloying calculates, use respectively W
1 deoxidationand W
1 alloyingrepresent;
B) calculate all the other element alloyed weight percentage that add, use respectively W
2 alloyings, W
n alloyingrepresent, and all calculate according to the following formula,
W
2 alloyings=(Q
1-Q
2)
W
n alloying=(Q
1-Q
2)
In formula: W
2 alloyings-be the weight percentage of the required the second chemical element adding of alloying, %;
W
n alloying-be the weight percentage of the required n kind chemical element adding of alloying, %;
Q
1-be the intermediate value of this chemical component weight per-cent span in steel, unit: %;
Q
2-be the remaining weight percent content of this chemical composition terminal in molten steel, unit: %;
C) calculate the required gross weight that adds chemical element in deoxidation and alloying, with W, represent unit: kg
W=(W
1 deoxidation÷ η
1+ W
1 alloying÷ η
1+ W
2 alloyings÷ η
2+ ... W
n alloying÷ η
n) * W
molten steel;
η
1η
2η
nbe respectively the first, the second ..., in N element in alloy mode, add fashionable, this element wt degree in alloy, when chemical element add when the simple substance, 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, carry out alloying: first by the required gross weight W that adds chemical element in deoxidation and alloying, mix with being not less than required 50% basic powder of chemical element gross weight W that adds, and the particle diameter of controlling alloy is at 0.075mm ~ 0.05mm; Again alloy cap is inserted in ladle, and made it lower to contacting with molten steel; Opening by the injection tube with water-cooled and stirring-head alloy cap inserts in molten steel, and controls stirring-head and be stuck in apart from steel-making tundish lower curtate 200-350mm place; Purity is more than 99.9%, pressure is 0.6 ~ 0.8 MPa nitrogen or rare gas element are blown into molten steel until alloying finishes by injection tube, and flow control is at 5 ~ 15Nm
3 /minute, make to be full of in alloy cap nitrogen or rare gas element, the projecting environment 0.005-0.01 of internal mask pressure MPa; Start alloy and basic powder mixture 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 stirs until alloying finishes, and controls stirring velocity at 3-6 cycle per minute clock; The nitrogen or the inert gas flow that are blown into are controlled at 20 ~ 30Nm
3 /minute;
5) chemical element and basic powder mixture add after end, standing 3 ~ 5 minutes, inclusion content in melting steel is fully floated and enter in covering slag;
6) according to routine, carry out rear process operations.
It is characterized in that: in alloying process, after being blown into chemical element and finishing and sample and analyze, when steel oxygen content in water adopts during higher than controlling valu, re-blow mode until meet the demands.
The effect of master operation in the present invention
The present invention will need to add alloy element gross weight W in deoxidation and alloying; with be not less than required 50% basic powder of alloy element gross weight W that adds after mixing; by the injection tube with water-cooled; with rare gas element, be blown into molten steel bottom; the mixture that adds reductor and basic powder; under the stirring of the stirring-head of injection tube; reductor reacts with steel water oxygen and generates deoxidation products; covering slag melts becomes liquid covering slag floating, and the rare gas element being blown into also forms a large amount of bubbles from molten steel bottom floating.In this process, the protected slag of inclusion wherein forming and rare gas element bubble absorb, and take in the covering slag of molten steel surface and remove, thereby it is few to have reached alloy consumption, and efficiency is high, the removed object of more inclusiones;
Employing is more than 99.9% nitrogen or rare gas element through alloy cap to being blown into purity in ladle with the injection tube of stirring-head and cooling tube, the degree of depth that its stirring-head of controlling injection tube inserts ladle is apart from 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, makes molten steel component even, and various inclusion floating are fast, and because alloy cap is by nitrogen or rare gas element sealing gland, without air, enters, and makes being mingled with still less in molten steel, alleviates the removal of impurity burden of rear operation.
The present invention compared with prior art; by add reductor and covering slag in ladle simultaneously; can accurately determine the required alloying element weight of 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, avoided burning loss of alloy.
Embodiment
Below the present invention is described in detail.
embodiment 1
Using the chemical element of silicon as deoxidation and alloying;
The final chemical composition that the steel grade that it will be smelted is set is: C:0.12～0.18%, Si:0.2～0.4%, Mn :～1.0～1.6 %, P:0.04～009%, S≤0.015%;
The Q of Si
1be 0.3%, adopt ferrosilicon as reductor material, it is siliceous is 50%;
According to composition, set the Q of Si
2be 0.03%; Known W
molten steelbe 120000 kg;
According to the weight percent content of the steel water oxygen of measuring, be 0.026%, the chemical equation that utilizes iron alloy to react with steel water oxygen, calculates the needed silicon amount of deoxidation w
deoxidationbe 0.0133%;
In ladle, carry out the step of alloying:
1) carry out converter smelting tapping;
2), in molten steel tapping process, add silicon to carry out deoxidation and alloying;
According to when adding a kind of alloy element to carry out deoxidation and alloying in ladle, its method of calculation: carry out following calculating:
A, according to routine, the steel oxygen content in water according to measuring, utilizes alloy element and the chemical equation that steel water oxygen reacts, and calculates its required percentage ratio w that accounts for molten steel gross weight that adds in deoxidation
deoxidationbe 0.0133%;
B, according to steel, silicon is set to content, according to following formula, calculate its required percentage ratio that accounts for molten steel gross weight that adds in alloying, 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%
The gross weight that C, calculating need this element or contains this mischmetal in deoxidation and alloying, represents unit: kg with W; Again by w
deoxidationbe 0.0133%, w
alloying=0.27%, W
molten steelthe following formula of=120000 kg substitution calculates, and calculates
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) in steel-making, carry out alloying in tundish: according to step 2) as calculated after, according to what should add alloy amount, 75% add basic powder, 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 made it lower to contacting with molten steel; Opening by the injection tube with water-cooled and stirring-head alloy cap inserts in molten steel, and controls stirring-head and be stuck in apart from steel-making tundish lower curtate 205mm place; The nitrogen that purity is 99.9%, pressure is 0.6 MPa is blown into molten steel by injection tube, and flow is 6Nm
3/ minute, make to be full of in alloy cap nitrogen, projecting environment 0.0055 MPa of internal mask pressure; Start alloy and basic powder mixture input injection tube, and under the drive of nitrogen, be blown in molten steel, the stirring-head in injection tube also stirs until alloying finishes, and controls stirring velocity at 3 cycle per minute clocks; The pressure of the nitrogen being blown into is 0.6MPa, and flow control is at 22Nm
3/ minute, until alloying finishes;
5) alloy and basic powder mixture add after end, and standing 3 minutes, cause molten steel interalloy composition even, inclusion content in melting steel fully floats and enters in covering slag;
6) according to routine, carry out rear process operations.
The present embodiment has calculated alloy consumption more accurately than prior art, has improved steel alloying constituent hit rate, and lumber recovery improves 5%, and inclusion content in melting steel content has reduced by 32%.
Embodiment 2
Using manganese and silicon as the element that carries out deoxidation and alloying
The final chemical composition that the steel grade that it will be smelted is set 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 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, set 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 is calculated as the account form when adding a kind of alloy element to carry out deoxidation and alloying, uses respectively W
1 deoxidationand W
1 alloyingrepresent;
According to the weight percent content of the steel water oxygen of measuring, be 0.03%, the chemical equation that utilizes iron alloy to react with steel water oxygen, calculates the needed silicon amount of deoxidation W
1 deoxidationbe 0.014%;
In ladle, carry out the step of alloying:
1) carry out converter smelting tapping;
2) in molten steel tapping process, add deoxidation alloying elemental silicon to carry out deoxidation, add silicon to carry out alloying;
According to when adding a kind of alloy element to 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), according to routine, according to the steel oxygen content in water of measuring, the chemical equation that utilizes alloy element to react with steel water oxygen, calculates silicon required percentage ratio W that accounts for molten steel gross weight that adds in deoxidation
1 deoxidationbe 0.014%;
B) according to steel, silicon is set to content, according to following formula, calculate its required percentage ratio that accounts for molten steel gross weight that adds in alloying, 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 needed total amount percentage ratio in deoxidation and alloying, use W
siliconrepresent unit: %; By W
1 deoxidationbe 0.014%, W
1 alloying=0.032%, W
molten steelbe the 120000 kg following formula calculating of substitution respectively:
W
silicon=(W
1 deoxidation+ W
1 alloying)=0.014%+0.32%=0.334 %
According to following formula, calculate the consumption percentage ratio of manganese when the alloying, use W
2 alloyings, by the Q of manganese
1be 0.38%, Q
2be 0.15% substitution:
W
2 alloyings=(Q
1-Q
2)=0.38%-0.15%=0.23%
The gross weight of calculating required silicon and manganese in deoxidation and alloying according to following formula, with W, unit is kg:
W=(W
1 deoxidation÷ η
1+ W
1 alloying÷ η
1+ W
2 alloyings÷ 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) in steel-making, carry out alloying in tundish: according to step 2) as calculated after, according to 100% of the silicon that should add and manganese alloy total amount, add basic powder, it is mixed with silicomanganese material, and make the particle diameter of basic powder at 0.075mm ~ 0.05mm; Again alloy cap is inserted in ladle, and made it lower to contacting with molten steel; Opening by the injection tube with water-cooled and stirring-head alloy cap inserts in molten steel, and controls stirring-head and be stuck in apart from steel-making tundish lower curtate 205mm place; The nitrogen that purity is 99.9%, pressure is 0.75 MPa is blown into molten steel by injection tube, and flow is 12Nm
3/ minute, make to be full of in alloy cap nitrogen, projecting environment 0.009 MPa of internal mask pressure; Start alloy and basic powder mixture input injection tube, and under the drive of nitrogen, be blown in molten steel, the stirring-head in injection tube also stirs until alloying finishes, and controls stirring velocity at 5 cycle per minute clocks; The pressure of the nitrogen being blown into is 0.75MPa, and flow control is at 28Nm
3/ minute, until alloying finishes;
5) alloy and basic powder mixture add after end, and standing 5 minutes, cause molten steel interalloy composition even, inclusion content in melting steel fully floats and enters in covering slag;
6) according to routine, carry out rear process operations.
The present embodiment has calculated alloy consumption more accurately than prior art, and lumber recovery improves 6%, has improved steel alloying constituent hit rate inclusion content in melting steel content and has reduced by 33%.
Embodiment 3
With aluminium, silicon, manganese, carry out the element of deoxidation and alloying
The final chemical composition that the steel grade that it will be smelted is set 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 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, set 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;
In ladle, carry out the step of alloying:
1) carry out converter smelting tapping;
2), in molten steel tapping process, add deoxidation alloying element aluminum, silicon, manganese to carry out deoxidation alloying;
According to when adding a kind of alloy element to 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 is calculated as the account form when adding a kind of alloy element to carry out deoxidation and alloying, uses respectively W
1 deoxidationand W
1 alloyingrepresent;
A), according to routine, according to the steel oxygen content in water of measuring, the chemical equation that utilizes aluminium to react with steel water oxygen, calculates aluminium required percentage ratio W that accounts for molten steel gross weight that adds in deoxidation
1 deoxidationbe 0.067%;
B) according to steel, aluminium is set to content, according to following formula, calculate its required percentage ratio that accounts for molten steel gross weight that adds in alloying, 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 silicon needed total amount percentage ratio in alloying, use W
2 alloyingsrepresent unit: %; By Q
1be 0.15 %, Q
2be 0.03%
Substitution
W
2 alloyings=(Q
1-Q
2)=0.15%-0.03%=0.12 %
According to following formula, calculate the consumption percentage ratio of manganese when the 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 formula, calculate required silicon, manganese raw material separately and the gross weight used of aluminium in deoxidation and alloying, with W, represent, unit is kg:
W=(W
1 deoxidation÷ η
1+ W
1 alloying÷ η
1+ W
2 alloyings÷ 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) in steel-making, carry out alloying in tundish: according to step 2) as calculated after, according to 60% of the aluminium that should add, silicon and manganese alloy total amount, add basic powder, it is mixed with silicomanganese material, and make the particle diameter of basic powder at 0.075mm ~ 0.05mm; Again alloy cap is inserted in ladle, and made it lower to contacting with molten steel; Opening by the injection tube with water-cooled and stirring-head alloy cap inserts in molten steel, and controls stirring-head and be stuck in apart from steel-making tundish lower curtate 205mm place; The nitrogen that purity is 99.9%, pressure is 0.75 MPa is blown into molten steel by injection tube, and flow is 12Nm
3/ minute, make to be full of in alloy cap nitrogen, projecting environment 0.009 MPa of internal mask pressure; Start alloy and basic powder mixture input injection tube, and under the drive of nitrogen, be blown in molten steel, the stirring-head in injection tube also stirs until alloying finishes, and controls stirring velocity at 5 cycle per minute clocks; The pressure of the nitrogen being blown into is 0.75MPa, and flow control is at 28Nm
3/ minute, until alloying finishes;
5) alloy and basic powder mixture add after end, and standing 5 minutes, cause molten steel interalloy composition even, inclusion content in melting steel fully floats and enters in covering slag;
6) according to routine, carry out rear process operations.
The present invention compared with prior art; by add reductor and covering slag in ladle simultaneously; can accurately determine the required alloying element weight of 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, avoided burning loss of alloy.
Above-described embodiment only exemplifies for the best, and is not the restriction to embodiments of the present invention.
Claims (2)
1. molten steel is carried out a method for deoxidation and alloying in converter ladle, its step:
1) carry out converter smelting tapping;
2) tap completely, in ladle, add alloy element to carry out component controlling, alloy element add-on method of calculation are as follows:
When adding a kind of alloy element to carry out deoxidation and alloying in ladle, its method of calculation:
A, according to routine, the steel oxygen content in water according to measuring, utilizes this chemical element and the chemical equation that steel water oxygen reacts, and calculates this chemical element and adds weight to account for the percentage ratio of molten steel gross weight, uses w
deoxidationrepresent;
B, according to steel grade, this chemical element is set to content, according to following formula, calculate its requirement in alloying and add the percentage ratio that accounts for molten steel gross weight, use w
alloyingrepresent calculation formula:
W
alloying=(Q
1-Q
2)
In formula: W
alloying-be the weight percent of required this chemical element of alloying, %
Q
1-be the intermediate value of this chemical element weight percent span in steel, unit: %;
Q
2-be the remaining weight percent content of this chemical element terminal in molten steel, unit: %;
The gross weight of C, the alloy that calculates in deoxidation alloying required this chemical element or contain this chemical element, represents unit: kg with W;
W=(W
deoxidation+ W
alloying) ÷ η * W
molten steel
In formula: the gross weight of required this chemical element of W-expression deoxidation and alloying, unit: kg;
W
molten steel-refer to molten steel gross weight, unit: kg;
η-represent that this chemical element adds in alloy mode is fashionable, and its weight percent content in alloy is fashionable when adding for simple substance, η=1;
When adding two kinds of (containing two kinds) above alloys to carry out the method for deoxidation and alloying, its method of calculation in ladle:
A) when adding multiple alloying element to carry out deoxidation and alloying, first therefrom select the chemical element of deoxidation constant minimum, and the account form when adding a kind of chemical element to carry out deoxidation and alloying calculates, use respectively W
1 deoxidationand W
1 alloyingrepresent;
B) calculate all the other element alloyed weight percentage that add, use respectively W
2 alloyings, W
n alloyingrepresent, and all calculate according to the following formula,
W
2 alloyings=(Q
1-Q
2)
W
n alloying=(Q
1-Q
2)
In formula: W
2 alloyings-be the weight percentage of the required the second chemical element adding of alloying, %;
W
n alloying-be the weight percentage of the required n kind chemical element adding of alloying, %;
Q
1-be the intermediate value of this chemical component weight per-cent span in steel, unit: %;
Q
2-be the remaining weight percent content of this chemical composition terminal in molten steel, unit: %;
C) calculate the required gross weight that adds chemical element in deoxidation and alloying, with W, represent unit: kg
W=(W
1 deoxidation÷ η
1+ W
1 alloying÷ η
1+ W
2 alloyings÷ η
2+ ... W
n alloying÷ η
n) * W
molten steel;
η
1η
2η
nbe respectively the first, the second ..., in N element in alloy mode, add fashionable, this element wt degree in alloy, when chemical element add when the simple substance, 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, carry out alloying: first by the required gross weight W that adds chemical element in deoxidation and alloying, mix with being not less than required 50% basic powder of chemical element gross weight W that adds, and the particle diameter of controlling alloy is at 0.075mm ~ 0.05mm; Again alloy cap is inserted in ladle, and made it lower to contacting with molten steel; Opening by the injection tube with water-cooled and stirring-head alloy cap inserts in molten steel, and controls stirring-head and be stuck in apart from steel-making tundish lower curtate 200-350mm place; Purity is more than 99.9%, pressure is 0.6 ~ 0.8 MPa nitrogen or rare gas element are blown into molten steel until alloying finishes by injection tube, and flow control is at 5 ~ 15Nm
3 /minute, make to be full of in alloy cap nitrogen or rare gas element, the projecting environment 0.005-0.01 of internal mask pressure MPa; Start alloy and basic powder mixture 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 stirs until alloying finishes, and controls stirring velocity at 3-6 cycle per minute clock; The nitrogen or the inert gas flow that are blown into are controlled at 20 ~ 30Nm
3 /minute;
5) chemical element and basic powder mixture add after end, standing 3 ~ 5 minutes, inclusion content in melting steel is fully floated and enter in covering slag;
6) according to routine, carry out rear process operations.
2. a kind of method of carrying out alloying in ladle as claimed in claim 1, it is characterized in that: in alloying process, after being blown into chemical element and finishing and sample and analyze, when adopting during higher than controlling valu, steel oxygen content in water re-blows mode until meet the demands.
Priority Applications (1)
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|---|---|---|---|
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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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