CN104232845A - Argon oxygen decarburization (AOD) slag-making method during smelting of sulfur-containing free-cutting stainless steel - Google Patents
Argon oxygen decarburization (AOD) slag-making method during smelting of sulfur-containing free-cutting stainless steel Download PDFInfo
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- CN104232845A CN104232845A CN201410445465.8A CN201410445465A CN104232845A CN 104232845 A CN104232845 A CN 104232845A CN 201410445465 A CN201410445465 A CN 201410445465A CN 104232845 A CN104232845 A CN 104232845A
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- aod
- lime
- magnesia
- slag
- sulfur
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Abstract
The invention discloses an argon oxygen decarburization (AOD) slag-making method during smelting of sulfur-containing free-cutting stainless steel. In the method, during AOD slag-making, a portion of lime is replaced by magnesia and the required addition amount of lime and magnesia is determined according to the amount of blowing-in oxygen and the amount of carbon and silicon mixed with molten steel. The addition amount of lime is determined according to the following formula shown in the specification, and Vo2 is the total amount of blowing-in oxygen, Wmelt is the weight of molten steel mixed with AOD, [%C] is the content of carbon steel mixed with AOD, [%Si] is the content of silicon steel mixed with AOD, and the addition amount of magnesia is about 50 percent of the addition amount of lime. According to the method, the problems that furnace lining erosion is severe because of manufacturing of low-alkalinity slag in the process of smelting the sulfur-containing free-cutting stainless steel and the yield of sulfur during manufacturing of high-alkalinity slag is low are solved, and the yield of sulfur is up to 80 percent.
Description
Technical field
The invention discloses AOD slagging method in the smelting of a kind of sulfur-bearing free cutting stainless steel, relate to the smelting iron and steel technical field of metallurgy industry.
Background technology
So-called sulfur-bearing free cutting stainless steel refers to the stainless material with excellent machinability, and the cutting ability improving material mainly adds Cutting free elementary sulfur to realize in steel.Sulphur causes the notch effect of stress concentration by forming tiny sulfide inclusion in steel, reduces the resistance to cutting of steel, but content also just because of sulphur is higher, brings difficulty to smelting.Chalcogen is in character comparatively active element, and calcium oxide reactive absorption, in slag, causes the sulphur recovery rate in molten steel to reduce easily and in slag.
CN102041355A discloses a kind of stainless steel refining process ladle dreg modifying agent, and its composition by weight percent is: CaO38 ~ 50%, SiO
222 ~ 28%, Al
2o
35 ~ 10%, CaF
25 ~ 10%, Ca-Si3 ~ 8%, MgO2 ~ 5%, B
2o
35 ~ 10%, modifier particle sizes 3 ~ 15mm, described stainless steel refining process ladle dreg modifying agent, the modification of the ladle slag after stainless steel smelting process AOD is tapped and reduction treatment, control its basicity, reduce its oxidisability, make ladle slag have the function improving stainless steel cleanliness factor, improve stainless quality further.
CN102560001A discloses a kind of desulfurization, oxygen technique of low capacity AOD furnace double slag process smelting stainless steel, it is characterized in that: AOD furnace capacity is less than or equal to 10 tons, after first molten steel is blended into AOD furnace, enter the oxygen decarburization phase, add slag charge and carry out a slag making, and oxygen decarburization; Oxygen decarburization terminates, and enters rich chromium slag prereduction stage, the chromic oxide produced during killing reduction oxygen decarburization, and at the end of the prereduction of rich chromium slag, liquid steel temperature controls as 1700-1820 DEG C; Enter secondary slag forming period, part is skimmed, and the basicity of slag of secondary slag making controls as 1.8-3.8, and the time of secondary slag forming period blowing argon gas or nitrogen is more than or equal to 2 minutes; Then the adjustment period of entering molten steel composition, adjustment molten steel composition; Tapping, tapping temperature is 1570-1670 DEG C, and molten steel is blended into steel teeming ladle, pours into steel ingot, this technique can reduce sulphur in steel, oxygen level significantly, thus can successfully smelt for high-end stainless steels such as cold or hot worked heavy alloyed super austenitic stainless steel and ultra hypoeutectoid, diphasic stainless steels.
CN102943148A discloses the stainless preparation method of a kind of high-purity, and the method comprises the following steps: the raw material of fusing is placed in AOD refining furnace and carries out decarburization and reduction and desulfurization, obtain molten steel; Then ladle is transported to; Carry out continuous casting again; Wherein, the process of AOD refining furnace comprises the following steps: after oxygen decarburization terminates, drop into ferrosilicon slag making simultaneously desulfurization, in desulfurization to stove S content < 0.01 % by weight time, from AOD refining furnace, first time tapping is to ladle, after skimming in ladle, molten steel to be blended into again in AOD refining furnace and from new slag making, oxygen blast basicity of slag controls within the scope of 1.4-1.8, then be blown into argon gas to stir, to stove during S content < 0.01%, from AOD refining furnace, second time tapping, obtains molten steel.This preparation method adopts AOD refining furnace, by double slag process, prevent the generation of rigid inclusion, thus it is stainless to prepare high-purity.
CN103014242A discloses a kind of stainless steel smelting dissolving agent and smelts slagging method, mainly relate to and smelt dissolving agent and AOD double slag process smelting slagging method for AOD double slag process, belong to stainless steel smelting field, described AOD double slag process is smelted dissolving agent and is made up of the first component and second component; Described first component is that after watering steel upper, the waste high alumina that produces gives up brick; Described second component is fluorite; The described high alumina brick that gives up includes the component of following masses per-cent (%): Al
2o
368-72, SiO
222-28, CaO2-5, Fe
2o
32-5; The mass values of described first component and described second component is 0.5:1.It is low that this AOD double slag process smelts dissolving agent cost, is beneficial to environmental protection and to change slag for comprehensive effective.
CN103667598A discloses a kind of austenitic stainless steel list slag melting method, relate to stainless steel smelting technical field, the step comprised has: water just made steel by (1) electric arc furnace, proceed to AOD furnace to continue to smelt, (2) reduce CO dividing potential drop in AOD furnace with rare gas element Ar (N), the method adopts rare gas element Ar (N) to reduce CO dividing potential drop, thus reaches the object that chromium protected by carbon drop, and need not temperature be improved, there is the advantage of energy-saving and emission-reduction.
JP2013006757A discloses a kind of method reducing lime in slag, and it is realized by the aqueous solution adding alkali metal hydroxide in slag, and removes lime effect by regulating the concentration of the described aqueous solution to reach the best.
EP2213753A1 discloses a kind of method for slag making in secondary steel-making, and the method comprises and being mixed with alumina and/or lime by the calcium made in steel converter slag-aluminium slag.
" Wingdale substitutes lime steelmaking slagging Effect disquisition ", Wang Pengfei etc., Baogang's science and technology, 38th volume the 4th phase, in August, 2012,30-32 page, have studied the behavior that converter steelmaking Wingdale replaces Wingdale in part lime slagging process, demonstrates the relatively reasonable scheme of coverter pig Wingdale steelmaking slagging.Result shows, converter steelmaking pre-add Wingdale in early stage does slag making raw material, can complete calciningization slag process very soon, can realize reducing ton steel lime consumption, reach the object of cost efficiency, can re-set target be reached with slagging with Lime stone, make converter ton steel lime consumption reduce nearly 10kg/t.
In the described slagging method of prior art, all do not relate to AOD slag making in sulfur-bearing free cutting stainless steel is smelted, simultaneously also openly magnesia replace a part of lime and according to the amount of oxygen be blown into be blended into the carbon of molten steel, silicone content determines the lime that needs to add and magnesia content, and does not provide such technology enlightenment or instruction.
In addition, according to thermomechanical analysis, the thermodynamic condition being conducive to desulfurization is high temperature, low oxygen level, high alkalinity, the large quantity of slag.Therefore, if want the recovery rate improving sulphur, need contrary with above-mentioned condition, low temperature, high oxygen level, low alkalinity, few quantity of slag.Wherein, temperature is because continuous casting superheating temperature requires and temperature drop in subsequent process, and the leeway of control is limited, and oxygen level is because of there being in molten steel the relation of silicon can not be too high.Therefore, in prior art approaches, the method normally low alkalinity that sulphur recovery rate adopts usually is improved, the method for few quantity of slag.But controlling low alkalinity slag, that AOD slag lining can be caused to corrode is serious, causes converter life to reduce, the quantity of slag very little follow-up LF operation is central can not arc-covering slag operation, easily cause molten steel recarburization.
Summary of the invention
In order to overcome the above-mentioned deficiency of above-mentioned prior art, the invention provides AOD slagging method in the smelting of a kind of free cutting stainless steel, the method, while guarantee sulphur recovery rate, is safe from harm to converter life.
The present inventor finds through further investigation, and MgO is basic oxide and sweetening power is lower than CaO, therefore, replace the words of a part of lime with magnesia during slag making, when not reducing basicity, the sweetening power of slag can be reduced, improving sulphur recovery rate and not affecting converter life.
Based on described discovery, and through lot of experiments, analysis with constantly optimize, the present invention determines following technical scheme:
A kind of sulfur-bearing free cutting stainless steel smelt in AOD slagging method, it is characterized in that, during AOD slag making, replace a part of lime with magnesia and according to the amount of oxygen be blown into be blended into the carbon of molten steel, silicone content determines the lime that needs to add and magnesia content.
Preferably, lime adding amount is determined as follows:
Wherein,
for the total oxygen demand be blown into, W
meltfor the Metal Weight that AOD is blended into, the steel grade carbon content that [%C] is blended into for AOD, the molten steel silicone content that [%Si] is blended into for AOD.Such calculation formula not do not record in previous technical literature, neither those skilled in the art easily expect, and is through expert of the art by complicated test, successive optimization and carry out that theoretical analysis just obtains.
Further preferably, magnesia add-on is about 50% of lime adding amount.The present inventor finds, when magnesia add-on is about 50% of lime adding amount, can obtains best sulphur recovery rate and not affect converter life.
Preferably, lime is quickened lime, wherein CaO>93%; Magnesia is one-level magnesia, wherein MgO>93%, and above content such as this area is understood, usually all based on weighing scale.
Preferably, toast at temperature more than 400 DEG C before described lime and magnesia add.
In present invention further optimization, described method can comprise the steps:
1) molten steel is after AOD completes decarburization reduction, needs the amount of lime that adds and magnesia add-on, make dual alkalinity (CaO/SiO according to following formulae discovery
2) be about 1.2, ternary basicity (CaO+MgO/SiO
2) be about 1.8.
Wherein,
for the total oxygen demand be blown into, W
meltfor the Metal Weight that AOD is blended into, the steel grade carbon content that [%C] is blended into for AOD, the molten steel silicone content that [%Si] is blended into for AOD;
Magnesia add-on is about 50% of lime adding amount.
2) lime used is quickened lime, wherein CaO>93%, and magnesia is one-level magnesia, wherein MgO>93%.
3) lime and magnesia toast at temperature before adding more than 400 DEG C.
Embodiment
Following enforcement is for setting forth the present invention, but protection scope of the present invention is not limited in following enforcement.
Embodiment 1:
Utilize AOD smelt sulphur content be 0.24% ~ 0.3% 303Cu sulfur-bearing free cutting stainless steel, use the inventive method carry out slag making.
Embodiment 2:
Utilize AOD to smelt the 303 sulfur-bearing free cutting stainless steels of sulphur content >0.15%, use the inventive method to carry out slag making.
Comparative example 1:
Utilize AOD to smelt 303Cu sulfur-bearing free cutting stainless steel that sulphur content is 0.24% ~ 0.3%, uses traditional AOD method of this area to carry out slag making.
Comparative example 2:
Utilize AOD to smelt the 303 sulfur-bearing free cutting stainless steels of sulphur content >0.15%, use traditional AOD method of this area to carry out slag making.
In above-described embodiment and comparative example, find embodiment 1 compared with comparative example 1 and embodiment 2 compared with comparative example 2, sulphur recovery rate improves 10% and 12% respectively, and converter life does not receive and do not affect, and slagging method of the present invention demonstrates obvious superiority.
Finally it should be noted that above-described embodiment is obviously only for example of the present invention is clearly described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of amplifying out or variation be still among protection scope of the present invention.
Claims (5)
1. sulfur-bearing free cutting stainless steel smelt in an AOD slagging method, it is characterized in that, during AOD slag making, replace a part of lime with magnesia and according to the amount of oxygen that is blown into be blended into the carbon of molten steel, silicone content determines the lime that needs to add and magnesia content.
2. AOD slagging method according to claim 1,
Wherein, lime adding amount is determined as follows
Wherein,
for the total oxygen demand be blown into, W
meltfor the Metal Weight that AOD is blended into, the steel grade carbon content that [%C] is blended into for AOD, the molten steel silicone content that [%Si] is blended into for AOD;
Magnesia add-on is about 50% of lime adding amount.
3. AOD slagging method according to claim 2, is characterized in that, lime is quickened lime, wherein CaO>93%; Magnesia is one-level magnesia, wherein MgO>93%.
4. the AOD slagging method according to claims 2 or 3, is characterized in that, toasts before shown lime and magnesia add more than 400 DEG C at temperature.
5. the AOD slagging method according to any one of claims 2-4, wherein molten steel is after AOD completes decarburization reduction, needs the amount of lime that adds and magnesia add-on, make dual alkalinity (CaO/SiO according to above-mentioned formulae discovery
2) be about 1.2, ternary basicity (CaO+MgO/SiO
2) be about 1.8.
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| CN106011380A (en) * | 2016-07-08 | 2016-10-12 | 邢台钢铁有限责任公司 | Method for conducting molten iron desulphurization through AOD |
| CN106868252A (en) * | 2017-03-01 | 2017-06-20 | 山西太钢不锈钢股份有限公司 | A kind of method of high sulfur free-cutting steel sulphur alloying |
| CN110714161A (en) * | 2019-10-17 | 2020-01-21 | 中天钢铁集团有限公司 | High-sulfur free-cutting steel for automobile and production process thereof |
| CN115466908A (en) * | 2022-09-29 | 2022-12-13 | 浙江青山钢铁有限公司 | Selenium-containing calcium-containing free-cutting stainless steel and preparation method thereof |
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Cited By (4)
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| CN115466908A (en) * | 2022-09-29 | 2022-12-13 | 浙江青山钢铁有限公司 | Selenium-containing calcium-containing free-cutting stainless steel and preparation method thereof |
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