CN101586174B - Steel two-slag purifying method for ultra-cleaning welding - Google Patents
Steel two-slag purifying method for ultra-cleaning welding Download PDFInfo
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- CN101586174B CN101586174B CN2009100626654A CN200910062665A CN101586174B CN 101586174 B CN101586174 B CN 101586174B CN 2009100626654 A CN2009100626654 A CN 2009100626654A CN 200910062665 A CN200910062665 A CN 200910062665A CN 101586174 B CN101586174 B CN 101586174B
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Abstract
The invention relates to a steel two-slag purifying method for ultra-cleaning welding, including the following steps successively: 1) melted iron and waste steel are added in an initial electric purifying furnace, and oxygen blowing smelting is carried out; 2) slag begins to be changed when the temperature of molten steel is heated till 1500 DEG C, P removing effect is improved, oxygen blowing heating is carried out, and steel comes out when the temperature of molten steel reaches to 1600 to 1620 DEG C, the content of C element is 0.02% to 0.05% and the content of P element is below 0.003%; 3)alloy deoxidant is added in ladle to carry out LF refining, and active lime is used as main slagging material to carry out initial S removing; 4) after 20 to 30 minutes of refining, the slag begins t o be changed when the content of S is reduced to below 0.015%, the secondary slag is refined and active lime matched with calcium carbide is used as main slagging material, Ca lines are added to strengthen S removing effect, so that the content of sulphur in steel is reduced to below 0.003%.
Description
Technical field
The present invention relates to a kind of two-slag purifying method of super clean welding steel, belong to technical field of steel production.
Background technology
Super clean welding steel P, S content are extremely low, and C, Si content are very low, and smelting technology has been proposed very high requirement.The technology of removing P, S content in the steel in producing at present comprises: converter (or electric furnace) double slag process takes off method desulfurization such as P, hot metal pretreatment and adjustment refining slag etc.Pass through to optimize the two slag process systems of combined blown converter as Shoudu Iron and Steel Co, improve converter dephosphorization effect in early stage, the steel phosphorus content is below 0.010%, main by optimizing the two slag of converter technology in early stage, TFe (14%～20%) content in basicity (2.0～2.5), temperature (1340～1400 ℃) and the slag of reasonable control slag, can obtain higher dephosphorization rate, dephosphorization effect is more satisfactory.If will stablize the molten steel that obtains [P]≤0.010%, need control [P]≤0.007% during tapping, and control dephosphorization and later stage rephosphorization in early stage well; Under no pretreatment dephosphorizing appointed condition, can produce the steel phosphorus content at the low phosphoretic steel below 0.010%, satisfy the particular requirement of steel grade to the steel cleanliness factor.Anshan iron and steel plant 100t top-blown oxygen converter single slag process and double slag process dephosphorization technology on the basis that the dephosphorisation reaction thermodynamics and kinetics is analyzed, have carried out test targetedly.Analyzed the influence of processing parameter, summed up the quantitative relationship of converter tapping phosphorus content, dephosphorization rate etc. and each main technologic parameters, proposed to optimize the working method of top blown converter dephosphorization technology dephosphorisation reaction.Wuhan Iron and Steel Plant adopts hot metal pretreatment S content in the molten iron can be reduced to below 0.010%, takes off P through the two slags of converter again, and refinery practices such as LF, RH take off S, go to be mingled with, to degas, and obtain the steel of high-cleanness, high.
But produce P, S content is extremely low, and C, the super clean welding steel that Si content is all lower, adopt above-mentioned Clean Steel production technique also to have deficiency, super clean welding steel P, S require respectively less than 0.005% and 0.003%, C, Si require respectively less than 0.10% and 0.04%, adopt above-mentioned technology guaranteeing that C, Si composition meet the requirements of simultaneously, are reduced to claimed range with P, S, for the steel mill of no hot metal pretreatment equipment, this problem seems more outstanding.
Summary of the invention
Purpose of the present invention provides exactly by the slag making of refining secondary, utilize the compound action of different slag systems, not increasing or the C that reduces, not returning or seldom return and realize under the prerequisite of Si strengthening taking off the S effect, cooperate the repeatedly slag making of furnace just to strengthen the steel two-slag purifying method for ultra-cleaning welding that takes off P again.
For achieving the above object, guarantee C, the Si composition of super clean welding steel, and P, S content all are reduced to claimed range, must take new measure not increasing or the C that reduces, not returning or seldom return the P, the S that remove under the prerequisite of Si in the steel, especially will solve the S problem of taking off deeply in the refining.
Technical scheme of the present invention: the present invention utilizes the characteristic reinforcement of different slag systems to take off the S effect by the slag that changes at refining process, improves the purity of welding steel, and its concrete technology in turn includes the following steps:
1) at first refines hot metal charging in the electric furnace, adding steel scrap, oxygen blast melting just;
2) liquid steel temperature rises to 1500 ℃ and begins to change slag, improves and takes off the P effect, and heating by O2 blowing reaches 0.02-0.05% when liquid steel temperature reaches 1600-1620 ℃, C element, the P element reaches below 0.003%, begins tapping;
3) add the alloy reductor in the ladle, enter the LF refining, adopting quickened lime is main slag making materials, carries out just taking off S;
4) after refining 20-30 minute, S content begins to change slag after reducing to below 0.015%, and it is main slag making materials that refining secondary slag adopts quickened lime to allocate calcium carbide into, adds the Ca line and strengthens taking off the S effect, and sulphur content in the steel is reduced to below 0.003%.
Described steel two-slag purifying method for ultra-cleaning welding, in the step 3), add alloy reductor Al, Mn or its alloy in the ladle and carry out alloying, enter the LF refining then, adopting quickened lime is main slag making materials, with 70 tons of molten steel is radix, and the quickened lime add-on is 550kg ± 50kg, carries out just taking off S.
Described steel two-slag purifying method for ultra-cleaning welding as preferred plan of the present invention, in step 4), begins to change slag after S content is reduced to below 0.010%.
Described steel two-slag purifying method for ultra-cleaning welding, in the step 4), it is main slag making materials that refining secondary slag adopts quickened lime to allocate calcium carbide into, with 70 tons of molten steel is radix, quickened lime and calcium carbide add-on are respectively 350-400kg and 50-60kg, and take off the Ca line of S effect as strengthening, add-on is a 50-80 rice.
Production method of the present invention has following advantage:
One, the present invention can realize taking off S in process of production preferably, produces the super clean welding steel that satisfies user's needs.
Its two, the present invention provides the approach of producing Clean Steel for the steel mill that do not have hot metal pretreatment.
Its three, the present invention does not need to increase investment substantially, can produce high-quality product, is that enterprise creates huge economic benefit.
It is main slag making materials that refining secondary slag adopts quickened lime to allocate calcium carbide into, has avoided time Si to return P.
Embodiment
Guarantee C, the Si composition of super clean welding steel, and P, S content be reduced to claimed range, must take new measure, especially will solve the S problem of taking off deeply in the refining not increasing or the C that reduces, not returning or seldom return the P, the S that remove under the prerequisite of Si in the steel.
For achieving the above object, the novel process of " refining double slag process " that the present invention is designed, promptly by the slag that changes at refining process, utilize the characteristic reinforcement of different slag systems to take off the S effect, improve the purity of welding steel, with 70 tons of molten steel is that radix is the example explanation, and its concrete technology in turn includes the following steps: 1) at first just converting 80%～90% in the furnace (electric furnace), adding steel scrap 10%～20%, oxygen blast melting;
2) liquid steel temperature rises to 1500 ℃ and begins to change slag, improves and takes off the P effect, and heating by O2 blowing reaches 0.02-0.05% when liquid steel temperature reaches 1600-1620 ℃, C element, the P element reaches below 0.003%, begins tapping;
3) add Al by 2.0kg/ ton steel in the ladle and carry out pre-deoxidation, add the FeMn alloying, enter the LF refining then, add 550kg ± 50kg quickened lime slag making, carry out just taking off S by the requirement of composition lower limit;
4) after the about 20-30 of refining minute, S content begins to change slag after reducing to below 0.015%, it is main slag making materials that refining secondary slag adopts quickened lime to allocate calcium carbide into, quickened lime add-on 350-400kg, calcium carbide add-on 50-60kg, feed 50-80 rice Ca line again, further strengthen sweetening effectiveness, sulphur content in the steel is reduced to below 0.003%.
As preferred plan of the present invention, in step 4), can after reducing to below 0.010%, S content begin to change slag.
The two slag refining techniquess of LF stove are at the LF stove refining initial stage, and adopting quickened lime is main slag making materials, carry out just taking off S, and this moment, slag was CaO-Al
2O
3-SiO
2Slag system, its main component is: CaO=50-58%, Al
2O
3=11-22%, SiO
2=11-22%, wherein Al
2O
3Be deoxidation products, influence sweetening effectiveness, after S content is reduced to below the certain value (0.015%), lost desulfidation substantially.Begin to change slag after the about 20-30 of refining minute.Changing refining secondary slag behind the slag, to adopt quickened lime to allocate calcium carbide into be main slag making materials, and this moment, slag was CaO-MgO-SiO
2Slag system, its main component is: CaO=50-58%, MgO=11-22%, Al
2O
3=4-6% is because Al in the slag
2O
3Reduce, sweetening effectiveness is improved, in refining process, feed a certain amount of Ca line again, further strengthen sweetening effectiveness, sulphur content in the steel can be reduced to below 0.003%, and return silicon, the rephosphorization phenomenon is better controlled, be to smelt super clean welding steel (C≤0.10%, Si≤0.04%, S≤0.003%, P≤0.005%) effective means.
Below in conjunction with specific embodiment steel two-slag purifying method for ultra-cleaning welding of the present invention is described in further detail:
To produce super clean welding steel H08AT is example.
Embodiment 1:
At first hot metal charging (about 85%), adding steel scrap (about 15%) in first furnace (70 tons of electric furnaces), the oxygen blast melting.Temperature rises to 1500 ℃ and begins to change slag, improves to take off the P effect, and heating by O2 blowing when liquid steel temperature rises to about 1620 ℃, reaches C≤0.04%, P≤0.003% and o'clock begins tapping in the composition; Tapping is adopted and is stayed the slag tapping, avoids down slag to cause and returns the P phenomenon early stage.In the actually operating, tap is controlled at about 85% of Intake Quantity.
Ladle need shift to an earlier date preheating, adds the about 300kg of steel core aluminium (aluminum content 50%), FeMn alloy 280kg in the ladle, tentatively adjusts composition and deoxidation.
Enter the LF refining, send electric Argon, add the slag making of 500kg quickened lime, carry out just taking off S, refining is after about 30 minutes, S content begins to change slag after reducing to below 0.010%, it is main slag making materials that refining secondary slag adopts quickened lime to allocate calcium carbide into, quickened lime add-on 350kg, calcium carbide add-on 50kg, for avoiding back Si to return P, no longer add reductor this moment.
About 15 minutes of Argon adds The addition of C a line (60 meters) and strengthens the deoxidization desulfuration effect, and sulphur content in the steel is reduced to below 0.003%, feeds The addition of C a line (30 meters) again, improves fluidity molten steel, and the continuous casting platform that begins to substitute carries out continuous casting.
Casting process adopts the whole process protection casting, and tundish, crystallizer protecting residue must be selected suitably, to avoid the generation of casting blank defect.Superheating temperature is controlled at 25-35 ℃ of scope.
Smelt actual procedure composition situation such as following table.
Embodiment 2:
Early stage, technology was identical with example 1.
Technology is slightly had any different after entering the LF refining, send electric Argon, adds the slag making of 500kg quickened lime, carry out just taking off S, refining is after about 25 minutes, and S content begins to change slag after reducing to below 0.015%, quickened lime add-on 400kg during the slag making of refining secondary, calcium carbide add-on 60kg.After about 15 minutes of the Argon, add The addition of C a line (80 meters) and strengthen the deoxidization desulfuration effect, sulphur content in the steel is reduced to below 0.003%, feed The addition of C a line (about 40 meters) again, improve fluidity molten steel, the continuous casting platform that begins to substitute carries out continuous casting.
Smelt actual procedure composition such as following table.
Embodiment 3:
Early stage, technology was identical with example 1.
Send electric Argon after entering the LF refining, add the slag making of 550kg quickened lime, carry out just taking off S, refining is after about 20 minutes, and S content begins to change slag after reducing to below 0.015%, quickened lime add-on 370kg during the slag making of refining secondary, calcium carbide add-on 55kg.After about 15 minutes of the Argon, add The addition of C a line (50 meters) and strengthen the deoxidization desulfuration effect, sulphur content in the steel is reduced to below 0.003%, feed The addition of C a line (35 meters) again, improve fluidity molten steel, the continuous casting platform that begins to substitute carries out continuous casting.
Smelt actual procedure composition such as following table.
Embodiment 4:
Early stage, technology was identical with example 1.
Send electric Argon after entering the LF refining, add the slag making of 600kg quickened lime, carry out just taking off S, refining is after about 25 minutes, and S content begins to change slag after reducing to below 0.015%, quickened lime add-on 400kg during the slag making of refining secondary, calcium carbide add-on 55kg.After about 15 minutes of the Argon, add The addition of C a line (70 meters) and strengthen the deoxidization desulfuration effect, sulphur content in the steel is reduced to below 0.003%, feed The addition of C a line (25 meters) again, improve fluidity molten steel, the continuous casting platform that begins to substitute carries out continuous casting.
Smelt actual procedure composition such as following table.
Claims (4)
1. steel two-slag purifying method for ultra-cleaning welding in turn includes the following steps:
1) at first refines hot metal charging in the electric furnace, adding steel scrap, oxygen blast melting just;
2) liquid steel temperature rises to 1500 ℃ and begins to change slag, improves and takes off the P effect, and heating by O2 blowing reaches 0.02-0.05% when liquid steel temperature reaches 1600-1620 ℃, C element, the P element reaches below 0.003%, begins tapping;
3) add the alloy reductor in the ladle, enter the LF refining, adopting quickened lime is main slag making materials, carries out just taking off S;
4) after refining 20-30 minute, S content begins to change slag after reducing to below 0.015%, and it is main slag making materials that refining secondary slag adopts quickened lime to allocate calcium carbide into, adds the Ca line and strengthens taking off the S effect, and sulphur content in the steel is reduced to below 0.003%.
2. steel two-slag purifying method for ultra-cleaning welding according to claim 1, it is characterized in that: in the step 3), add alloy reductor Al, Mn or its alloy in the ladle and carry out alloying, enter the LF refining then, adopting quickened lime is main slag making materials, with 70 tons of molten steel is radix, and the quickened lime add-on is 550kg ± 50kg, carries out just taking off S.
3. steel two-slag purifying method for ultra-cleaning welding according to claim 1 is characterized in that: in step 4), begin to change slag after S content is reduced to below 0.010%.
4. steel two-slag purifying method for ultra-cleaning welding according to claim 1, it is characterized in that: in the step 4), it is main slag making materials that refining secondary slag adopts quickened lime to allocate calcium carbide into, with 70 tons of molten steel is radix, quickened lime and calcium carbide add-on are respectively 350-400kg and 50-60kg, and take off the Ca line of S effect as strengthening, add-on is a 50-80 rice.
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| CN101586174B true CN101586174B (en) | 2010-09-15 |
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| CN102747192B (en) * | 2011-04-20 | 2013-11-06 | 攀钢集团钢铁钒钛股份有限公司 | Method for smelting ultralow-sulfur steel |
| CN102828001A (en) * | 2012-09-25 | 2012-12-19 | 鞍钢股份有限公司 | Slagging method for steel ladle refining furnace |
| CN109680214B (en) * | 2019-02-21 | 2021-01-22 | 南通乾宝汽车零部件有限公司 | High-strength starter speed reduction gear ring material |
| CN115198058B (en) * | 2022-06-24 | 2023-10-27 | 石家庄钢铁有限责任公司 | Smelting method of low-carbon low-sulfur ultralow-silicon welding wire steel |
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| US6391086B1 (en) * | 2001-03-20 | 2002-05-21 | Northstar Steel Co. | Method for the use of electric steel plant slag for self-reducing agglomerates |
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