CN103276153A - Method for reducing nitrogen content of welding steel wire rod - Google Patents
Method for reducing nitrogen content of welding steel wire rod Download PDFInfo
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- CN103276153A CN103276153A CN2013101808425A CN201310180842A CN103276153A CN 103276153 A CN103276153 A CN 103276153A CN 2013101808425 A CN2013101808425 A CN 2013101808425A CN 201310180842 A CN201310180842 A CN 201310180842A CN 103276153 A CN103276153 A CN 103276153A
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Abstract
The invention discloses a method for reducing the nitrogen content of a welding steel wire rod. The method comprises the following steps of: treating the combination of molten iron and waste steel in a primary refining electric furnace, wherein the molten iron accounts for more than 70 percent; tapping at the temperature of between 1,620 and 1,650 DEG C; adding 10 to 20 kg/ton of metallic manganese and 4 to 10 kg/ton of ferromolybdenum into the molten steel after tapping, and delivering the mixture to a refining furnace; after the mixture is delivered to the low frequency (LF) refining furnace, sequentially adding a first batch of slag and a second batch of slag; after the slag becomes white, performing fine adjustment of alloy in the LF refining furnace to prevent nitrogen absorption caused by the naked molten steel in the ladle hoisting process, and finally adding 1 to 2 kg/ton of powdery carbon-free covering agent; and preventing the molten steel from absorbing nitrogen by using a fiber sealing ring during continuous casting. The method is simple in process route, strong in operability and easy to control.
Description
Technical field
The present invention relates to the metallurgy industry electric furnace and produce the smelting process for production of high cleanliness welding wire steel, refer to a kind of method that reduces nitrogen content in the welding steel wire rod particularly.
Background technology
Along with the development of metallurgical technology, the content of other impurity element such as oxygen, sulphur, hydrogen etc. can take off very low degree.But, denitrogenation is not a nothing the matter, the ratio of ionic radii hydrogen of nitrogen is big, spread coefficient in steel is than little two orders of magnitude of hydrogen, the effect of vacuum method dehydrogenation is very good, and is just so uneasy but vacuum is used for denitrogenation, and it is so greatly active that nitrogen does not resemble oxygen, can form inclusion with strong reductor such as aluminium, barium, silicon etc., get rid of by come-up; And the activity of nitrogen is very different, and the nitride that forms with most of alloying elements at high temperature all will decompose, and can't remove by come-up.Along with the development of furnace outer refining technology, T.O reduces significantly in the steel, and the w in the ultrapure steel (T.O) is to 10 * 10
-6Below, oxide inclusion significantly reduces, and the destruction that TiN etc. is mingled with under this condition has manifested to come out.Especially in the low carbon high-strength steel, the increase of solid solution nitrogen can make the intensity hardness of weld metal rise, and plasticity toughness descends, and crack sensitivity increases.
A lot of producers though clearly do not propose requirement to N content, but propose very high request to processing and the use in whole welding wire rod later stage on to the requirement of high quality welds with the steel wire rod quality.A lot of researchs show no matter N content height is that the result who still welds deposited performance has bigger influence to the quality of welding with the post-production of steel wire rod.And nitrogen content is higher in the steel that traditional electric furnace smelting process is produced, and plasticity, toughness and the rolling performance of the high steel of nitrogen content are very poor, and the welding steel wire rod is in the cold working process, and the drawing amount is bigger, occur draw crack even fracture easily, directly influence welding quality and welding property.
There is the method for taking off N in domestic a lot of producer, but the overwhelming majority all be middle and high carbon aspect with the converter smelting aspect, and electric furnace produce low-carbon and low-sulphur steel aspect to take off the N method less, and process is comparatively complicated, cost is also higher relatively.
Summary of the invention
Technical problem to be solved by this invention just provides a kind of method that reduces N constituent content in the welding steel wire rod.By adjusting the injected volume of the reductor in the first furnace tapping process of electric furnace, release sequence, injected volume and the release time of the interior reductor of refining furnace shortens time and the thickness of slag layer of refining furnace generation white slag realizes, thereby reduces N content in the steel.
For solving the problems of the technologies described above, a kind of method that reduces nitrogen content in the welding steel wire rod provided by the invention may further comprise the steps:
1) combination of refining electric furnace employing molten iron+steel scrap just, wherein iron water amount accounts for more than 70%; Tapping temperature: T=1620 ~ 1650 ℃; Add the aluminium ingot of 0.6 ~ 1.2kg/ ton, the quickened lime of 6 ~ 15kg/ ton during tapping, slag under tapping process is forbidden;
2) after the tapping, in molten steel, add the manganese metal of 10 ~ 20kg/ ton and the molybdenum-iron of 4 ~ 10kg/ ton, enter refining furnace again;
3) enter and add first slag charge behind the LF refining furnace, under 1540 ~ 1570 ℃ of conditions of temperature, heat 7 ~ 14min;
4) add second batch of slag charge in the LF refining furnace, the refinery scum layer thickness remains on 100 ~ 110mm, and slag system is: CaO:40% ~ 45%, Al
2O
3: SiO 15% ~ 25%,
2: 5 ~ 6%, FeO+MnO≤1.0%, MgO:8%;
5) treat that slag bleaches after, detect slag system and be: CaO:45% ~ 55%, Al
2O
3: SiO 20% ~ 30%,
2When insulating covering agent 8 ~ 10%, FeO+MnO≤0.8%, MgO:8%, the LF refining furnace is carried out the alloy fine setting, add the manganese of 0.5 ~ 0.9kg/ ton and the molybdenum of 0.08 ~ 0.15kg/ ton earlier, add the ferrotianium of 3 ~ 6kg/ ton and the ferro-boron of 0.25 ~ 0.4kg/ ton again, control tapping nitrogen content is lower than 100ppm;
6) composition is adjusted back soft blow argon gas, be under 400 ~ 600NL/min condition in argon gas intensity, behind working hour 3 ~ 5min, the Ca line that adds 2 ~ 6mm/ ton, be the 3 ~ 5min that works under 400 ~ 600NL/min condition in argon gas intensity again, make molten steel composition, temperature even, prevent from that molten steel is exposed in the bull ladle process to cause suction nitrogen, add the carbon-free covering agent of powdery 1 ~ 2kg/ ton at last;
7) use during continuous casting the fibrous encapsulation circle to prevent absorption of nitrogen by steel.
Further, described step 2) in, the requirement of electric furnace steel tapping terminal point composition is: C≤0.04%, P≤0.06%, N≤0.0060%.
Again further, in the described step 3), first slag charge is the quickened lime of 2 ~ 8kg/ ton, the fluorite of 0.5 ~ 4kg/ ton, the Al ball of 0.8 ~ 2.5kg/ ton.
Again further, in the described step 4), second batch of slag charge: the quickened lime of 2 ~ 6kg/ ton, the fluorite of 0.8 ~ 2kg/ ton, the aluminum shot of 0.2 ~ 0.6k/ ton, the silicon calcium powder of 0.4 ~ 0.8kg/ ton.
Again further, in the described step 3), the carbon-free covering agent chemical ingredients is by weight percentage: SiO
2: 10 ~ 25%, MgO:8 ~ 20%, Fe
2O
3≤ 5%, C≤1%, CaO:15 ~ 30%, Al
2O
3≤ 15%, H
2O≤0.5%, surplus are unavoidable impurities.
Beneficial effect of the present invention is:
1. production cost of the present invention is low, save energy;
2. technology circuit provided by the invention is simple, workable, is easy to control;
3. adopt the N content in the low-carbon and low-sulphur steel of electric furnace production of the present invention to be reduced to below the 80ppm from 120ppm;
4. the cleanliness factor height of steel, wherein non-metallic inclusion: 0 grade of category-A, category-B≤0.5 grade, C class≤0 grade, 0 grade of D class; O≤15ppm in addition, N≤80ppm, S≤0.003%, P≤0.008%.
5. production hot rolling welding wire steel wire rod of the present invention can be handled without annealing process in the cold-drawn course of processing, directly is drawn into silk to finished product, directly reduces by 200 yuan/ton of user's tooling costs.
6. after the welding wire steel of the present invention's production and X70 steel plate weld, the low temperature of the deposited performance in weld (20 ℃) impelling strength (A
KV2) reach more than the 150J.
Embodiment
In order to explain the present invention better, further illustrate main contents of the present invention below in conjunction with specific embodiment, but content of the present invention not only is confined to following examples.
The welding steel wire rod, its chemical ingredients mainly comprises (weight percent): C:0.05 ~ 0.08%, Si:0.15 ~ 0.25%, Mn:1.50 ~ 1.70%, P :≤0.012%, S :≤0.003%, O :≤0.0025%, N :≤0.0100%, also contain elements such as Mo, Ti, B.
Embodiment 1:
1) adopt electrocardio stove on the low side → LF refining furnace → continuous casting process to smelt production high quality welds steel wire rod.
2) first furnace batch is 72 tons, adopts the combination of molten iron+steel scrap, and wherein iron water amount is 64t; Electric furnace steel tapping terminal point composition and temperature control requirement: C:0.04%, P:0.06%, N:60ppm, tapping temperature: T=1620 ℃; Add the aluminium ingot of 60kg, the quickened lime of 800kg during tapping, slag under tapping process is forbidden.
3) before tapping back molten steel enters refining furnace, add the manganese metal of 1000kg and the molybdenum-iron of 450kg.
4) in order to reduce the absorption of nitrogen by steel amount, enter and add quickened lime 500kg behind the refining furnace earlier, add the fluorite of 200kg again, add the Al ball of 90kg at last; Under 1540 ℃ of conditions of temperature, heat 7min; The quickened lime that adds 300kg adds the fluorite of 100kg again, adds the aluminum shot of 30kg then, adds the silicon calcium powder of 50kg at last; The refinery scum layer thickness remains at 110mm, and slag system is: CaO:40%, Al
2O
3: SiO 25%,
2: 5%, FeO+MnO:0.7%, MgO:12.1%, do not reach 110mm at foamy slag and do not carry out dark sulfur removal technology before thick, cause molten steel to inhale nitrogen in order to avoid destroy the O-N balance.
5) treat that slag bleaches after, slag system is: CaO:45%, Al
2O
3: SiO 30%,
2: 8%, FeO+MnO:0.65% and MgO:10.6%, the LF stove carries out the fine setting of alloy, adds the manganese of 52kg and the molybdenum of 11kg earlier, adds the ferrotianium of 320kg and the ferro-boron of 26kg again, guarantees that the tapping nitrogen content is lower than 100ppm.
6) composition is adjusted back soft blow argon gas, be under the 400NL/min condition in argon gas intensity, after working hour is 3min, the Ca line that adds 200mm is that the 3min that works under the 400NL/min condition makes molten steel composition, temperature even in argon gas intensity again, prevents the exposed suction nitrogen that causes of molten steel in the bull ladle process, the carbon-free covering agent that adds powdery 100kg at last, preventing in the bull ladle process that molten steel is exposed causes suction nitrogen, and wherein, the carbon-free covering agent chemical ingredients is by weight percentage: SiO
2: 10 ~ 25%, MgO:8 ~ 20%, Fe
2O
3≤ 5%, C≤1%, CaO:15 ~ 30%, Al
2O
3≤ 15%, H
2O≤0.5%, surplus are unavoidable impurities.
7) use during continuous casting the fibrous encapsulation circle to prevent absorption of nitrogen by steel.
Employing the present invention is to provide the high quality welds of the low C of electric furnace production, low P, low S, low N and uses a kind of smelting control method of nitrogen content in the steel wire rod, and its strand sample nitrogen content result is between the 95ppm;
The nitrogen content detected result is 73ppm in the wire rod material; Non-metallic inclusion: 0 grade of category-A, category-B≤0.5 grade, C class≤0 grade, 0 grade of D class.O:15ppm in the steel, C:0.067%, Mn:1.65%, Si:0.14%, S:0.002%, P:0.008%, Mo:0.35%, Ni:0.043%, Al:0.020%, B:0.0060%, Ti:0.056%.
Embodiment 2
1) adopt electrocardio stove on the low side → LF refining furnace → continuous casting process to smelt production high quality welds steel wire rod.
2) first furnace batch is 75 tons, adopts the combination of molten iron+steel scrap, and wherein iron water amount is 63t; Electric furnace steel tapping terminal point composition and temperature control requirement: C:0.04%, P:0.05%, N:58ppm, tapping temperature: T=1634 ℃; Add the aluminium ingot of 65kg, the quickened lime of 800kg during tapping, slag under tapping process is forbidden.
3) before tapping back molten steel enters refining furnace, add manganese metal and the 450kg molybdenum-iron of 1000kg;
4) in order to reduce the absorption of nitrogen by steel amount, enter refining furnace after, add quickened lime 500Kg earlier, add the fluorite of 200kg again, add the Al ball of 90kg at last; Under 1540 ℃ of conditions of temperature, heat 7min; The quickened lime that adds 400kg again adds the fluorite of 100kg again, adds the aluminum shot of 35kg then, adds silicon calcium powder 28Kg at last; The refinery scum layer thickness remains at 100mm, and slag system is: CaO:42%, Al
2O
3: SiO 20%,
2: 6%FeO+MnO:0.67% and MgO:11.3%, do not reach 100mm at foamy slag and do not carry out dark sulfur removal technology before thick, cause molten steel to inhale nitrogen in order to avoid destroy the O-N balance.
5) treat that slag bleaches after, slag system is: CaO:47%, Al
2O
3: SiO 25%,
2: 9%, FeO+MnO:0.62% and MgO:10.5%, the LF stove carries out the fine setting of alloy, adds the manganese of 58kg and the molybdenum of 15kg earlier, adds the ferrotianium of 322kg and the ferro-boron of 27kg again, guarantees that the tapping nitrogen content is lower than 100ppm.
6) composition is adjusted back soft blow argon gas, be under the 450NL/min condition in argon gas intensity, after working hour is 5min, the Ca line that adds 150mm, be that the 3min that works under the 400NL/min condition makes molten steel composition, temperature even in argon gas intensity again, prevent from that molten steel is exposed in the bull ladle process to cause suction nitrogen, add the carbon-free covering agent of powdery 120kg at last, prevent that exposed the causing of molten steel inhaled nitrogen wherein in the bull ladle process, the carbon-free covering agent chemical ingredients is by weight percentage: SiO
2: 10 ~ 25%, MgO:8 ~ 20%, Fe
2O
3≤ 5%, C≤1%, CaO:15 ~ 30%, Al
2O
3≤ 15%, H
2O≤0.5%.
7) use during continuous casting the fibrous encapsulation circle to prevent absorption of nitrogen by steel.
Employing the present invention is to provide the high quality welds of the low C of electric furnace production, low P, low S, low N and uses a kind of smelting control method of nitrogen content in the steel wire rod, and its strand sample nitrogen content result is 82ppm;
The nitrogen content detected result is 69ppm in the wire rod material; Non-metallic inclusion: 0 grade of category-A, category-B≤0.5 grade, C class≤0 grade, 0 grade of D class.O:15ppm in the steel, C:0.057%, Mn:1.62%, Si:0.16%, S:0.003%, P:0.007%, Mo:0.36%, Ni:0.041%, Al:0.021%, B:0.0064%, Ti:0.070%.
Embodiment 3
1) adopt electrocardio stove on the low side → LF refining furnace → continuous casting process to smelt production high quality welds steel wire rod.
2) first furnace batch is 76 tons, adopts the combination of molten iron+steel scrap, and wherein iron water amount is 62t; Electric furnace steel tapping terminal point composition and temperature control requirement: C:0.03%, P:0.06%, N:54ppm, tapping temperature: T=1641 ℃; Add the aluminium ingot of 68kg, the quickened lime of 600kg during tapping, slag under tapping process is forbidden.
3) before tapping back molten steel enters refining furnace, add 1000kg manganese metal and 450kg molybdenum-iron;
4) in order to reduce the absorption of nitrogen by steel amount, enter refining furnace after, add quickened lime 500Kg earlier, add the fluorite of 150kg again, add the Al ball of 110kg at last; Under 1540 ℃ of conditions of temperature, heat 14min; The quickened lime that adds 350kg again adds the fluorite of 100kg again, adds the aluminum shot of 26kg then, adds the silicon calcium powder of 40kg at last; The refinery scum layer thickness remains at 110mm, and slag system is: CaO:43%, Al
2O
3: SiO 20%,
2: 6%, FeO+MnO:0.65% and MgO:10.2%, do not reach 110mm at foamy slag and do not carry out dark sulfur removal technology before thick, cause molten steel to inhale nitrogen in order to avoid destroy the O-N balance.
5) treat that slag bleaches after, slag system is: CaO:48%, Al
2O
3: SiO 24%,
2: 9%, FeO+MnO:0.59% and MgO:9.7%, the LF stove carries out the fine setting of alloy, adds the manganese of 58kg and the molybdenum of 15kg earlier, adds the ferrotianium of 322kg and the ferro-boron of 27kg again, guarantees that the tapping nitrogen content is lower than 100ppm.
6) composition is adjusted back soft blow argon gas, be under the 500NL/min condition in argon gas intensity, after working hour is 5min, the Ca line that adds 100mm, be that the 3min that works under the 400NL/min condition makes molten steel composition, temperature even in argon gas intensity again, prevent from that molten steel is exposed in the bull ladle process to cause suction nitrogen, add the carbon-free covering agent of powdery 120kg at last, prevent that exposed the causing of molten steel inhaled nitrogen wherein in the bull ladle process, the carbon-free covering agent chemical ingredients is by weight percentage: SiO
2: 10 ~ 25%, MgO:8 ~ 20%, Fe
2O
3≤ 5%, C≤1%, CaO:15 ~ 30%, Al
2O
3≤ 15%, H
2O≤0.5%.
7) use during continuous casting the fibrous encapsulation circle to prevent absorption of nitrogen by steel.
Employing the present invention is to provide the high quality welds of the low C of electric furnace production, low P, low S, low N and uses a kind of smelting control method of nitrogen content in the steel wire rod, and its strand sample nitrogen content result is 76ppm;
The nitrogen content detected result is at 62ppm in the wire rod material; Non-metallic inclusion: 0 grade of category-A, category-B≤0.5 grade, C class≤0 grade, 0 grade of D class.O:15ppm in the steel, C:0.068%, Mn:1.60%, Si:0.15%, S:0.001%, P:0.008%, Mo:0.35%, Ni:0.038%, Al:0.018%, B:0.0070%, Ti:0.068%.
Embodiment 4
1) adopt electrocardio stove on the low side → LF refining furnace → continuous casting process to smelt production high quality welds steel wire rod.
2) first furnace batch is 72 tons, adopts the combination of molten iron+steel scrap, and wherein iron water amount is 58t; Electric furnace steel tapping terminal point composition and temperature control requirement: C:0.02%, P:0.05%, N:53ppm, tapping temperature: T=50 ℃; Add the aluminium ingot of 68kg, the quickened lime of 700kg during tapping, slag under tapping process is forbidden.
3) before tapping back molten steel enters refining furnace, add the manganese metal of 1000kg and the molybdenum-iron of 450kg;
4) in order to reduce the absorption of nitrogen by steel amount, enter refining furnace after, add the quickened lime of 600kg earlier, add the fluorite of 200kg again, add the Al ball of 100kg at last; Under 1560 ℃ of conditions of temperature, heat 10min; The quickened lime that adds 200kg again adds the fluorite of 150kg again, adds the aluminum shot of 40kg then, adds the silicon calcium powder of 30kg at last; The refinery scum layer thickness remains at 110mm.Slag system is: CaO:44%, Al
2O
3: SiO 18%,
2: 6%, FeO+MnO:0.59% and MgO:9.4%, do not reach 110mm at foamy slag and do not carry out dark sulfur removal technology before thick, cause molten steel to inhale nitrogen in order to avoid destroy the O-N balance.
5) treat that slag bleaches after, slag system is: CaO:52%, Al
2O
3: SiO 22%,
2: 9%, FeO+MnO:0.54% and MgO:8.3%, the LF stove carries out the fine setting of alloy, adds the manganese of 52kg and the molybdenum of 11kg earlier, adds the ferrotianium of 320kg and the ferro-boron of 26kg again, guarantees that the tapping nitrogen content is lower than 100ppm.
6) composition is adjusted back soft blow argon gas, be under the 600NL/min condition in argon gas intensity, after working hour is 4min, the Ca line that adds 200mm, be that the 4min that works under the 600NL/min condition makes molten steel composition, temperature even in argon gas intensity again, prevent from that molten steel is exposed in the bull ladle process to cause suction nitrogen, add powdery 100kg carbon-free covering agent at last, prevent that exposed the causing of molten steel inhaled nitrogen wherein in the bull ladle process, the carbon-free covering agent chemical ingredients is by weight percentage: SiO
2: 10 ~ 25%, MgO:8 ~ 20%, Fe
2O
3≤ 5%, C≤1%, CaO:15 ~ 30%, Al
2O
3≤ 15%, H
2O≤0.5%.
7) use during continuous casting the fibrous encapsulation circle to prevent absorption of nitrogen by steel.
Employing the present invention is to provide the high quality welds of the low C of electric furnace production, low P, low S, low N and uses a kind of smelting control method of nitrogen content in the steel wire rod, and its strand sample nitrogen content result is 74ppm;
The nitrogen content detected result is 60ppm in the wire rod material; Non-metallic inclusion: 0 grade of category-A, category-B≤0.5 grade, C class≤0 grade, 0 grade of D class.O:12ppm in the steel, C:0.059%, Mn:1.63%, Si:0.15%, S:0.001%, P:0.008%, Mo:0.36%, Ni:0.037%, Al:0.022%, B:0.0060%, Ti:0.066%.
Embodiment 5
1) adopt electrocardio stove on the low side → LF refining furnace → continuous casting process to smelt production high quality welds steel wire rod.
2) first furnace batch is 80 tons, adopts the combination of molten iron+steel scrap, and wherein iron water amount is 57t; Electric furnace steel tapping terminal point composition and temperature control requirement: C:0.02%, P:0.06%, N:51ppm, tapping temperature: T=1640 ℃; Add the aluminium ingot of 70kg, the quickened lime of 600kg during tapping, slag under tapping process is forbidden.
3) before tapping back molten steel enters refining furnace, add the manganese metal of 1000kg and the molybdenum-iron of 450kg;
4) in order to reduce the absorption of nitrogen by steel amount, enter refining furnace after, add the quickened lime of 600kg earlier, add the fluorite of 180kg again, add the Al ball of 120kg at last; Under 1550 ℃ of conditions of temperature, heat 12min; The quickened lime that adds 500kg again adds the fluorite of 150kg again, adds the aluminum shot of 39kg then, adds the silicon calcium powder of 40kg at last; The refinery scum layer thickness remains at 110mm.Slag system is: CaO:45%, Al
2O
3: SiO 15%,
2: 6%, FeO+MnO:0.54% and MgO:9.2%, do not reach 110mm at foamy slag and do not carry out dark sulfur removal technology before thick, cause molten steel to inhale nitrogen in order to avoid destroy the O-N balance.
5) treat that slag bleaches after, slag system is: CaO:55%, Al
2O
3: SiO 20%,
2: 10%, FeO+MnO:0.50% and MgO:8.0%, the LF stove carries out the fine setting of alloy, adds the manganese of 60kg and the molybdenum of 15kg earlier, adds the ferrotianium of 322kg and the ferro-boron of 28kg again, guarantees that the tapping nitrogen content is lower than 100ppm.
6) composition is adjusted back soft blow argon gas, be under the 400NL/min condition in argon gas intensity, after working hour is 4min, the Ca line that adds 200mm, be that the 4min that works under the 400NL/min condition makes molten steel composition, temperature even in argon gas intensity again, prevent from that molten steel is exposed in the bull ladle process to cause suction nitrogen, add powdery 80kg carbon-free covering agent at last, prevent that exposed the causing of molten steel inhaled nitrogen wherein in the bull ladle process, the carbon-free covering agent chemical ingredients is by weight percentage: SiO
2: 10 ~ 25%, MgO:8 ~ 20%, Fe
2O
3≤ 5%, C≤1%, CaO:15 ~ 30%, Al
2O
3≤ 15%, H
2O≤0.5%.
7) use during continuous casting the fibrous encapsulation circle to prevent absorption of nitrogen by steel.
Employing the present invention is to provide the high quality welds of the low C of electric furnace production, low P, low S, low N and uses a kind of smelting control method of nitrogen content in the steel wire rod, and its strand sample nitrogen content result is between 81ppm;
Employing the present invention is to provide the high quality welds of the low C of electric furnace production, low P, low S, low N and uses a kind of smelting control method of nitrogen content in the steel wire rod, and the nitrogen content detected result is between 65ppm in the final finished material; Non-metallic inclusion: 0 grade of category-A, category-B≤0.5 grade, C class≤0 grade, 0 grade of D class.O:10ppm in the steel, C:0.063%, Mn:1.60%, Si:0.11%, S≤0.001%, P:0.007%, Mo:0.36%, Ni:0.085%, Al:0.016%, B:0.0048%, Ti:0.052%.
Embodiment 1 ~ 5 and low-carbon (LC), the low-sulfur steel production model result of electric furnace routine are compared, see the following form:
After interpretation of result, can find: employing the present invention is to provide the high quality welds of the low C of electric furnace production, low P, low S, low N and uses a kind of smelting control method of nitrogen content in the steel wire rod, and the nitrogen content detected result is between 60ppm in the final finished material; Non-metallic inclusion: 0 grade of category-A, category-B≤0.5 grade, 0 grade of C class, 0 grade of D class.O≤15ppm in the steel, [N]≤80ppm, S≤0.001%, P≤0.008%.C≤0.07%，Si≤0.16%，Al≤0.022%。
Claims (5)
1. method that reduces nitrogen content in the welding steel wire rod is characterized in that: may further comprise the steps:
1) combination of refining electric furnace employing molten iron+steel scrap just, wherein iron water amount accounts for more than 70%; Tapping temperature: T=1620 ~ 1650 ℃; Add the aluminium ingot of 0.6 ~ 1.2kg/ ton, the quickened lime of 6 ~ 15kg/ ton during tapping, slag under tapping process is forbidden;
2) after the tapping, in molten steel, add the manganese metal of 10 ~ 20kg/ ton and the molybdenum-iron of 4 ~ 10kg/ ton, enter refining furnace again;
3) enter and add first slag charge behind the LF refining furnace, under 1540 ~ 1570 ℃ of conditions of temperature, heat 7 ~ 14min;
4) add second batch of slag charge in the LF refining furnace, the refinery scum layer thickness remains on 100 ~ 110mm, and slag system is: CaO:40% ~ 45%, Al
2O
3: SiO 15% ~ 25%,
2: 5 ~ 6%, FeO+MnO≤1.0%, MgO:8%;
5) treat that slag bleaches after, detect slag system and be: CaO:45% ~ 55%, Al
2O
3: SiO 20% ~ 30%,
2When insulating covering agent 8 ~ 10%, FeO+MnO≤0.8%, MgO:8%, the LF refining furnace is carried out the alloy fine setting, add the manganese of 0.5 ~ 0.9kg/ ton and the molybdenum of 0.08 ~ 0.15kg/ ton earlier, add the ferrotianium of 3 ~ 6kg/ ton and the ferro-boron of 0.25 ~ 0.4kg/ ton again, control tapping nitrogen content is lower than 100ppm;
6) composition is adjusted back soft blow argon gas, be under 400 ~ 600NL/min condition in argon gas intensity, behind working hour 3 ~ 5min, the Ca line that adds 2 ~ 6mm/ ton, be the 3 ~ 5min that works under 400 ~ 600NL/min condition in argon gas intensity again, make molten steel composition, temperature even, prevent from that molten steel is exposed in the bull ladle process to cause suction nitrogen, add the carbon-free covering agent of powdery 1 ~ 2kg/ ton at last;
7) use during continuous casting the fibrous encapsulation circle to prevent absorption of nitrogen by steel.
2. according to the method for nitrogen content in the described reduction welding steel of claim 1 wire rod, it is characterized in that: described step 2), the requirement of electric furnace steel tapping terminal point composition is: C≤0.04%, P≤0.06%, N≤0.0060%.
3. according to the method for nitrogen content in claim 1 or the 2 described reduction welding steel wire rods, it is characterized in that: in the described step 3), first slag charge is the quickened lime of 2 ~ 8kg/ ton, the fluorite of 0.5 ~ 4kg/ ton, the Al ball of 0.8 ~ 2.5kg/ ton.
4. according to the method for nitrogen content in claim 1 or the 2 described reduction welding steel wire rods, it is characterized in that: in the described step 4), second batch of slag charge: the quickened lime of 2 ~ 6kg/ ton, the fluorite of 0.8 ~ 2kg/ ton, 0.2 the aluminum shot of ~ 0.6k/ ton, the silicon calcium powder of 0.4 ~ 0.8kg/ ton.
5. according to the method for nitrogen content in claim 1 or the 2 described reduction welding steel wire rods, it is characterized in that: in the described step 3), the carbon-free covering agent chemical ingredients is by weight percentage: SiO
2: 10 ~ 25%, MgO:8 ~ 20%, Fe
2O
3≤ 5%, C≤1%, CaO:15 ~ 30%, Al
2O
3≤ 15%, H
2O≤0.5%, surplus are unavoidable impurities.
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| CN104259414A (en) * | 2014-09-16 | 2015-01-07 | 河北钢铁股份有限公司唐山分公司 | Titanium-containing solder wire steel production method capable of alleviating continuous casting nozzle clogging |
| CN105132620A (en) * | 2015-09-10 | 2015-12-09 | 山东西王特钢有限公司 | Cost-reducing steelmaking method |
| CN106319131A (en) * | 2015-06-26 | 2017-01-11 | 鞍钢股份有限公司 | Method for controlling nitrogen increase of niobium-containing steel |
| CN109252438A (en) * | 2018-10-10 | 2019-01-22 | 中建八局第三建设有限公司 | A kind of technique using refining furnace white slag stabilization processes cement stabilization layer |
| CN110205560A (en) * | 2019-05-09 | 2019-09-06 | 唐山市德龙钢铁有限公司 | A kind of low carbon steel plate welding steel slab and its production method |
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| CN115786797A (en) * | 2022-11-11 | 2023-03-14 | 南京钢铁股份有限公司 | Smelting method of low-nitrogen welding-wire protecting steel under EAF + LF process flow |
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| CN106319131A (en) * | 2015-06-26 | 2017-01-11 | 鞍钢股份有限公司 | Method for controlling nitrogen increase of niobium-containing steel |
| CN105132620A (en) * | 2015-09-10 | 2015-12-09 | 山东西王特钢有限公司 | Cost-reducing steelmaking method |
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| CN111020096A (en) * | 2019-11-22 | 2020-04-17 | 辽宁科技大学 | Single LF (low frequency) process low-nitrogen control method for dual-phase automobile steel DP590 |
| CN111020096B (en) * | 2019-11-22 | 2021-05-28 | 辽宁科技大学 | Single LF (low frequency) process low-nitrogen control method for dual-phase automobile steel DP590 |
| CN111979374A (en) * | 2020-07-21 | 2020-11-24 | 南京钢铁股份有限公司 | Smelting method for controlling low sulfur of low-aluminum low-silicon welding wire steel |
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| CN112553407A (en) * | 2020-12-25 | 2021-03-26 | 广西永烨金属材料科技有限公司 | Preparation method of nitrogen-controlled nuclear-grade special steel |
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