CN105063474A - Electric furnace smelting method of steel for welding wire - Google Patents
Electric furnace smelting method of steel for welding wire Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 65
- 239000010959 steel Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000003723 Smelting Methods 0.000 title claims abstract description 22
- 238000003466 welding Methods 0.000 title claims abstract description 17
- 239000002893 slag Substances 0.000 claims abstract description 75
- 238000007670 refining Methods 0.000 claims abstract description 44
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 31
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 24
- 239000011574 phosphorus Substances 0.000 claims abstract description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 36
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 36
- 239000004571 lime Substances 0.000 claims description 36
- 238000007664 blowing Methods 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 31
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- 238000005266 casting Methods 0.000 claims description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 21
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 20
- 239000010436 fluorite Substances 0.000 claims description 20
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 15
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 15
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 15
- 229910052760 oxygen Inorganic materials 0.000 claims description 15
- 239000005997 Calcium carbide Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 14
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 12
- 239000000956 alloy Substances 0.000 claims description 12
- 239000004411 aluminium Substances 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 238000010079 rubber tapping Methods 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229920001296 polysiloxane Polymers 0.000 claims description 8
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 4
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 12
- 229910052717 sulfur Inorganic materials 0.000 abstract description 7
- 238000009749 continuous casting Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000010703 silicon Substances 0.000 abstract description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 4
- 238000006477 desulfuration reaction Methods 0.000 abstract description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 2
- 230000023556 desulfurization Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000011593 sulfur Substances 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005502 peroxidation Methods 0.000 description 1
- 238000009865 steel metallurgy Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses an electric furnace smelting method of steel for welding wires, which comprises an electric furnace smelting process, a ladle refining process and a billet continuous casting process. The key process technology comprises an electric furnace smelting high-efficiency deep dephosphorization technology, and specifically comprises a slagging system, a temperature system and a slag flowing system for high-efficiency dephosphorization at the early stage; the ladle refining high-efficiency desulfurization technology prohibits aluminum deoxidation in the whole smelting process, and specifically comprises the control of refining slag components and the control of soft stirring time; the continuous casting process of the small square billet comprises the control of continuous casting superheat degree and drawing speed and the control of a cooling process. The smelting method is simple to operate and low in production cost, and can provide the continuous casting billet for the low-silicon low-aluminum low-phosphorus high-purity wire-welding steel, wherein the silicon content is lower than 0.03%, the aluminum content is lower than 0.003%, the phosphorus content is lower than 0.008%, and the sulfur content is lower than 0.006%.
Description
Technical field
The invention belongs to field of steel metallurgy, relate to a kind of electric furnace smelting method of steel for welding wire.
Background technology
Power station structure, because of its severe running environment, requires that it has high safety coefficient, therefore proposes stricter requirement to construction material, as required high to the purity of steel used and supporting wlding.The elements such as S, P, Al, Si all can make the fragility of welding joint increase, and increase weld cracking tendency.Therefore, some power station welding wire steels require to have lower S, P, Al, Si content.Because dephosphorisation reaction in molten steel smelting process needs to carry out at high alkalinity, high oxidative slag environment, molten steel peroxidation is easily caused while dephosphorization, therefore deoxidation must be strengthened when subsequent smelting, and Al, Si are as strong deoxidant element, when its content is lower, very easily cause deoxidation insufficient, thus affect desulphurization reaction further.Therefore, produce the dephosphorization of molten steel when low Si, low P steel, deoxidation and desulphurization reaction wayward, and finally not easily smelt the steel for welding wire of high cleanliness.
Summary of the invention
The object of the present invention is to provide a kind of electric furnace smelting method of steel for welding wire, specifically, a kind of silicone content can be provided lower than 0.03%, aluminium content lower than 0.003%, phosphorus content lower than 0.008%, sulphur content lower than 0.006% the smelting process of high-purity welding wire steel of the low aluminium low phosphorus content of low silicon.
For achieving the above object, present invention employs following technical scheme:
A kind of smelting process of steel for welding wire, the chemical composition of steel is by weight percentage: 0.05%≤C≤0.09%, Si≤0.03%, 0.55%≤Mn≤0.65%, S≤0.006%, P≤0.008%, Cr≤0.08%, Ni≤0.08%, Cu≤0.08%, Mo≤0.02%, Al≤0.003%, surplus is Fe and inevitable impurity, specifically comprises electrosmelting operation, ladle refining operation and continuous small-billet casting operation.
1), in described electrosmelting operation, burden structure comprises molten iron and steel scrap, hot metal ratio >=70%; Whole process takes oxygen supply blowing mode, and blow omnidistance no power; Blowing starts, in blowing 30 minutes, to control lime adding amount >=23kg/t, bath temperature≤1560 DEG C; Can tap when in molten bath, carbon content≤0.06%, phosphorus content≤0.006%, temperature are 1600 ~ 1640 DEG C; In ladle, add alloy and slag charge according to the order of " ferrosilicon → low carbon ferromanganese → lime → fluorite " when tap reaches total tap 15 ~ 20%, forbid to add aluminium or the alloy containing aluminium;
2), in described ladle refining operation, add lime, fluorite, calcium carbide adjustment refining slag composition in refining process, the weight percent mainly formed by slag controls at 50%≤CaO≤55%, Al
2o
3≤ 8%, 15%≤SiO
2≤ 20%, 6%≤MgO≤10%, 15%≤CaF
2≤ 20%, MnO+T.Fe≤1.5%; And molten steel temperature is adjusted to 1593 ~ 1603 DEG C, the chemical composition of steel is adjusted to by weight percentage: C0.05 ~ 0.09, Si≤0.03, Mn0.55 ~ 0.65, S≤0.006, P≤0.008, Cr≤0.08%, Ni≤0.08%, Cu≤0.08%, Mo≤0.02%, Al≤0.003%; Refining time is no less than 35 minutes, and the white slag time is no less than 15 minutes; Refining terminates the soft stirring of rear Argon, and the soft churning time of Argon is no less than 10 minutes;
3), in described continuous small-billet casting operation, casting process adopts whole process protection casting, and tundish adopts liquid-solid bilayer structure insulating covering agent to protect; The superheating temperature of tundish molten steel is 20 ~ 40 DEG C; Pulling rate is 2.2 ~ 2.6m/min.
Further, in described electrosmelting operation, blowing starts in blowing 30 minutes, take the principle of batch charging, according to the silicone content of molten iron, control lime adding amount is 23 ~ 30kg/t, control starts to flow the slag time for blowing beginning is after 15 minutes, and basicity of slag >=2.0 when making stream slag, T.Fe content >=20% in slag, make bath temperature≤1560 DEG C, phosphorus content≤0.02% in molten bath.
Further, in described electrosmelting operation, the add-on of alloy and the dissolved oxygen massfraction of eaf tapping point molten steel meet following relation: W (ferrosilicon)=(8 ~ 15) × [%O]/(silicone content in ferrosilicon), W (low carbon ferromanganese)=(70 ~ 85) × [%O]/(Fe content in low carbon ferromanganese)
Further, in described refining procedure, the method controlling refining slag main component is add lime 0 ~ 5kg/t in electric furnace steel tapping process; Refining process, according to slag and steel liquid deoxidation situation, adds lime, fluorite and calcium carbide in batches, and control lime adding amount is 5 ~ 10kg/t, fluorite add-on is 2 ~ 7kg/t, calcium carbide add-on is 0.2 ~ 1kg/t.
Further, in described continuous small-billet casting operation, secondary cooling zone takes four sections of cooling modes, the relation of each district water yield and pulling rate v is as follows: district's water yield is v × (55 ~ 65) L/min, two district's water yields are v × (68 ~ 78) L/min, three district's water yields are v × (18 ~ 24) L/min, and four district's water yields are v × (14 ~ 20) L/min.
Compared with the prior art, the present invention at least has following beneficial effect:
At electric furnace Primary period, basicity of slag during by controlling lime Adding Way, lime adding amount, control flow check slag time and flowing slag, reach the effect improving electric furnace dephosphorization rate in early stage, alleviate the dephosphorization pressure of subsequent high temperature smelting process, finally achieve eaf tapping point phosphorus content lower than 0.006% dephosphorization target.
In electric furnace steel tapping and refining process, by not using aluminium deoxidation, and control Al in slag
2o
3content, lower than 8%, decreases reaction 3 [Si]+2 (Al between slag
2o
3)=3 (SiO
2)+4 [Al], reach control aluminium content in steel lower than 0.003% target.
By accurately controlling the slag composition of ladle refining, improving basicity of slag, ensureing, under the prerequisite that in molten steel, Si content is lower, to reach and reduce SiO in slag
2the object of activity, improves the deoxidation effect of molten steel; Meanwhile, by controlling CaF suitable in slag
2content, reduces slag melting, ensures the mobility of slag, improves slag desulfurization capacity and desulfuration efficiency, ensure that the sweetening effectiveness of molten steel.
The electric furnace smelting method of the low-phosphorous welding wire of the low aluminium of low silicon provided by the invention, has technical process shorter, the beneficial effect that production cost is lower, solves ordinary method and is difficult to produce the difficult problem simultaneously requiring low silicon, low aluminium, low-phosphorous and low-sulphur steel.
Embodiment
Adopt smelting process of the present invention to adopt 140mm × 140mm section continuous casting square billet continuous seepage 3 stoves at steelshop, comprise 110t electrosmelting operation, ladle refining operation and continuous small-billet casting operation, concrete technology method is as follows:
1), in described electrosmelting operation, burden structure comprises molten iron and steel scrap, hot metal ratio >=70%; Whole process takes oxygen supply blowing mode, and blow omnidistance no power; Blowing starts, in blowing 30 minutes, to take the principle of batch charging, according to the silicone content of molten iron, controls lime adding amount >=23kg/t, controls that to start to flow the slag time be after 15 minutes, and basicity of slag >=2.0 when making stream slag, T.Fe content >=20% in slag; Take aforesaid operations measure, make bath temperature≤1560 DEG C, phosphorus content≤0.02% in molten bath, increase substantially the dephosphorization efficiency in early stage, alleviate the dephosphorization pressure of subsequent smelting; Can tap when in molten bath, carbon content≤0.06%, phosphorus content≤0.006%, temperature are 1600 ~ 1640 DEG C; In ladle, alloy and slag charge is added according to the order of " ferrosilicon → low carbon ferromanganese → lime → fluorite " when tap reaches 15 ~ 20% of total tap, forbid to add aluminium or the alloy containing aluminium, blowing starts in blowing 30 minutes, take the principle of batch charging, according to the silicone content of molten iron, control lime adding amount is 23 ~ 30kg/t, control starts to flow the slag time for blowing beginning is after 15 minutes, and basicity of slag >=2.0 when making stream slag, T.Fe content >=20% in slag, make bath temperature≤1560 DEG C, phosphorus content≤0.02% in molten bath; The add-on of alloy and the dissolved oxygen massfraction of eaf tapping point molten steel meet following relation: W (ferrosilicon)=(8 ~ 15) × [%O]/(silicone content in ferrosilicon), W (low carbon ferromanganese)=(70 ~ 85) × [%O]/(Fe content in low carbon ferromanganese);
2) in described ladle refining operation, refining process is according to slag and steel liquid deoxidation situation, add lime, fluorite and calcium carbide in batches and regulate refining slag composition, control lime adding amount is 5 ~ 10kg/t, fluorite add-on is 2 ~ 7kg/t, calcium carbide add-on is 0.2 ~ 1kg/t, and the weight percent mainly formed by slag controls at 50%≤CaO≤55%, Al
2o
3≤ 8%, 15%≤SiO
2≤ 20%, 6%≤MgO≤10%, 15%≤CaF
2≤ 20%, MnO+T.Fe≤1.5%; And adjusting molten steel temperature with other constituent content to target value, refining time is no less than 35 minutes, and the white slag time is no less than 15 minutes; Refining terminates the soft stirring of rear Argon, and the soft churning time of Argon is no less than 10 minutes;
3), in described continuous small-billet casting operation, the section of small billet is 140mm × 140mm; Casting process adopts whole process protection casting, and tundish adopts liquid-solid bilayer structure insulating covering agent to protect; The superheating temperature of tundish molten steel is 20 ~ 40 DEG C; Pulling rate is 2.2 ~ 2.6m/min; Secondary cooling zone takes four sections of cooling modes, the relation of each district water yield and pulling rate v is as follows: district's water yield is v × (55 ~ 65) L/min, two district's water yields are v × (68 ~ 78) L/min, three district's water yields are v × (18 ~ 24) L/min, and four district's water yields are v × (14 ~ 20) L/min.
Below in conjunction with specific embodiment, the present invention is further described.
Embodiment one
During electrosmelting, burden structure comprises molten iron and steel scrap, and wherein iron water amount is 85t, and high-quality steel scrap amount is 27t, and hot metal ratio is 76%; Whole process takes oxygen supply blowing mode, and blow omnidistance no power; Blowing starts in blowing 30 minutes, and take the principle of batch charging, lime adds total amount 2780kg, starts to flow the slag time for blowing beginning 16 minutes, and basicity of slag during stream slag is 2.1, T.Fe content 30% in slag; During blowing beginning 30 minutes, bath temperature is 1534 DEG C, and molten bath phosphorus content is 0.0162%; Tapping when carbon content is 0.043% in molten bath, phosphorus content is 0.0056%, temperature is 1607 DEG C; In ladle, add alloy and slag charge according to the order of " ferrosilicon → low carbon ferromanganese → lime → fluorite " when tap is 17% of total tap, wherein ferrosilicon add-on is 130kg, and low carbon ferromanganese add-on is 510kg, and lime adding amount is 320kg.
During ladle refining, according to slag and steel liquid deoxidation situation, add lime, fluorite and calcium carbide in batches and regulate refining slag composition, refining process lime adds that total amount is 800kg, fluorite add-on is 450kg, calcium carbide add-on is 50kg, and the weight percent mainly formed by slag controls at CaO:53.2%, Al
2o
3: 5.6%, SiO
2: 15.4%, MgO:6.9%, CaF
2: 16.7%, MnO:0.31%, T.Fe:0.65%; And adjusting molten steel temperature with other constituent content to target value, refining total time is 41 minutes, and the white slag time is 18 minutes; Refining terminates the soft stirring of rear Argon, and the soft churning time of Argon is 12 minutes.
During continuous small-billet casting, casting process adopts whole process protection casting, and tundish adopts liquid-solid bilayer structure insulating covering agent to protect; The superheating temperature of tundish molten steel is 30-36 DEG C; Pulling rate is 2.4m/min; Secondary cooling zone takes four sections of cooling modes, and secondary cooling zone each district water yield is as follows: district's water yield is 144L/min, and two district's water yields are 175L/min, and three district's water yields are 50L/min, and four district's water yields are 40L/min.
The finished product composition recording steel after having cast is C:0.067%, Si:0.01%, Mn:0.60%, S:0.0034%, P:0.0067%, Cr:0.05%, Ni:0.04%, Cu:0.03%, Mo:0.005%, Al:0.0024%.
Embodiment two
During electrosmelting, burden structure comprises molten iron and steel scrap, and wherein iron water amount is 87t, and high-quality steel scrap amount is 25t, and hot metal ratio is 78%; Whole process takes oxygen supply blowing mode, and blow omnidistance no power; Blowing starts in blowing 30 minutes, and take the principle of batch charging, lime adds total amount 1850kg, starts to flow the slag time for blowing beginning 18 minutes, and basicity of slag during stream slag is 2.2, T.Fe content 28% in slag; During blowing beginning 30 minutes, bath temperature is 1550 DEG C, and molten bath phosphorus content is 0.0186%; Tapping when carbon content is 0.055% in molten bath, phosphorus content is 0.0052%, temperature is 1614 DEG C; In ladle, add alloy and slag charge according to the order of " ferrosilicon → low carbon ferromanganese → lime → fluorite " when tap is 18% of total tap, wherein ferrosilicon add-on is 120kg, and low carbon ferromanganese add-on is 527kg, and lime adding amount is 300kg.
During ladle refining, according to slag and steel liquid deoxidation situation, add lime, fluorite and calcium carbide in batches and regulate refining slag composition, refining process lime adds that total amount is 580kg, fluorite add-on is 400kg, calcium carbide add-on is 60kg, and the weight percent mainly formed by slag controls at CaO:52.1%, Al
2o
3: 4.3%, SiO
2: 16.3%, MgO:6.2%, CaF
2: 18.4%, MnO:0.40%, T.Fe:0.53%; And adjusting molten steel temperature with other constituent content to target value, refining total time is 38 minutes, and the white slag time is 17 minutes; Refining terminates the soft stirring of rear Argon, and the soft churning time of Argon is 12 minutes.
During continuous small-billet casting, casting process adopts whole process protection casting, and tundish adopts liquid-solid bilayer structure insulating covering agent to protect; The superheating temperature of tundish molten steel is 23-31 DEG C; Pulling rate is 2.4m/min; Secondary cooling zone takes four sections of cooling modes, and secondary cooling zone each district water yield is as follows: district's water yield is 144L/min, and two district's water yields are 175L/min, and three district's water yields are 50L/min, and four district's water yields are 40L/min.
The finished product composition recording steel after having cast is C:0.066%, Si:0.03%, Mn:0.59%, S:0.0055%, P:0.0066%, Cr:0.04%, Ni:0.04%, Cu:0.05%, Mo:0.003%, Al:0.0025%.
Embodiment three
During electrosmelting, burden structure comprises molten iron and steel scrap, and wherein iron water amount is 88t, and high-quality steel scrap amount is 24t, and hot metal ratio is 79%; Whole process takes oxygen supply blowing mode, and blow omnidistance no power; Blowing starts in blowing 30 minutes, and take the principle of batch charging, lime adds total amount 2440kg, starts to flow the slag time for blowing beginning 18 minutes, and basicity of slag during stream slag is 2.0, T.Fe content 27% in slag; During blowing beginning 30 minutes, bath temperature is 1527 DEG C, and molten bath phosphorus content is 0.0173%; Tapping when carbon content is 0.048% in molten bath, phosphorus content is 0.0050%, temperature is 1619 DEG C; In ladle, add alloy and slag charge according to the order of " ferrosilicon → low carbon ferromanganese → lime → fluorite " when tap is 17% of total tap, wherein ferrosilicon add-on is 125kg, and low carbon ferromanganese add-on is 512kg, and lime adding amount is 308kg.
During ladle refining, according to slag and steel liquid deoxidation situation, add lime, fluorite and calcium carbide in batches and regulate refining slag composition, refining process lime adds that total amount is 575kg, fluorite add-on is 425kg, calcium carbide add-on is 65kg, and the weight percent mainly formed by slag controls at CaO:50.5%, Al
2o
3: 6.4%, SiO
2: 15.2%, MgO:8.0%, CaF
2: 15.8%, MnO:0.26%, T.Fe:0.72%; And adjusting molten steel temperature with other constituent content to target value, refining total time is 37 minutes, and the white slag time is 17 minutes; Refining terminates the soft stirring of rear Argon, and the soft churning time of Argon is 12 minutes.
During continuous small-billet casting, casting process adopts whole process protection casting, and tundish adopts liquid-solid bilayer structure insulating covering agent to protect; The superheating temperature of tundish molten steel is 25-32 DEG C; Pulling rate is 2.4m/min; Secondary cooling zone takes four sections of cooling modes, and secondary cooling zone each district water yield is as follows: district's water yield is 144L/min, and two district's water yields are 175L/min, and three district's water yields are 50L/min, and four district's water yields are 40L/min.
The finished product composition recording steel after having cast is C:0.064%, Si:0.02%, Mn:0.58%, S:0.0038%, P:0.0061%, Cr:0.06%, Ni:0.06%, Cu:0.04%, Mo:0.004%, Al:0.0022%.
The above embodiment only have expressed the specific embodiment of the present invention, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.Those skilled in the art all drops in protection scope of the present invention any variation that the present invention does under the enlightenment that the present invention conceives.
Claims (5)
1. the smelting process of a steel for welding wire, the chemical composition of steel is by weight percentage: C0.05 ~ 0.09, Si≤0.03, Mn0.55 ~ 0.65, S≤0.006, P≤0.008, Cr≤0.08%, Ni≤0.08%, Cu≤0.08%, Mo≤0.02%, Al≤0.003%, surplus is Fe and inevitable impurity, specifically comprise electrosmelting operation, ladle refining operation and continuous small-billet casting operation, it is characterized in that
1), in described electrosmelting operation, burden structure comprises molten iron and steel scrap, hot metal ratio >=70%; Whole process takes oxygen supply blowing mode, and blow omnidistance no power; Blowing starts, in blowing 30 minutes, to control lime adding amount >=23kg/t, bath temperature≤1560 DEG C; Can tap when in molten bath, carbon content≤0.06%, phosphorus content≤0.006%, temperature are 1600 ~ 1640 DEG C; In ladle, add alloy and slag charge according to the order of " ferrosilicon → low carbon ferromanganese → lime → fluorite " when tap reaches total tap 15 ~ 20%, forbid to add aluminium or the alloy containing aluminium;
2), in described ladle refining operation, add lime, fluorite, calcium carbide adjustment refining slag composition in refining process, the weight percent mainly formed by slag controls at 50%≤CaO≤55%, Al
2o
3≤ 8%, 15%≤SiO
2≤ 20%, 6%≤MgO≤10%, 15%≤CaF
2≤ 20%, MnO+T.Fe≤1.5%; And molten steel temperature is adjusted to 1593 ~ 1603 DEG C, the chemical composition of steel is adjusted to by weight percentage: C0.05 ~ 0.09, Si≤0.03, Mn0.55 ~ 0.65, S≤0.006, P≤0.008, Cr≤0.08%, Ni≤0.08%, Cu≤0.08%, Mo≤0.02%, Al≤0.003%; Refining time is no less than 35 minutes, and the white slag time is no less than 15 minutes; Refining terminates the soft stirring of rear Argon, and the soft churning time of Argon is no less than 10 minutes;
3), in described continuous small-billet casting operation, casting process adopts whole process protection casting, and tundish adopts liquid-solid bilayer structure insulating covering agent to protect; The superheating temperature of tundish molten steel is 20 ~ 40 DEG C; Pulling rate is 2.2 ~ 2.6m/min.
2. the electric furnace smelting method of steel for welding wire according to claim 1, it is characterized in that, in described electrosmelting operation, blowing starts, in blowing 30 minutes, to take the principle of batch charging, according to the silicone content of molten iron, control lime adding amount is 23 ~ 30kg/t, controls to start to flow the slag time for blowing beginning is after 15 minutes, and basicity of slag >=2.0 when making stream slag, T.Fe content >=20% in slag, make bath temperature≤1560 DEG C, phosphorus content≤0.02% in molten bath.
3. the electric furnace smelting method of steel for welding wire according to claim 1, it is characterized in that, in described electrosmelting operation, the add-on of alloy and the dissolved oxygen massfraction of eaf tapping point molten steel meet following relation: W (ferrosilicon)=(8 ~ 15) × [%O]/(silicone content in ferrosilicon), W (low carbon ferromanganese)=(70 ~ 85) × [%O]/(Fe content in low carbon ferromanganese).
4. the electric furnace smelting method of steel for welding wire according to claim 1, is characterized in that, the method controlling refining slag main component in described refining procedure is add lime 0 ~ 5kg/t in electric furnace steel tapping process; Refining process, according to slag and steel liquid deoxidation situation, adds lime, fluorite and calcium carbide in batches, and control lime adding amount is 5 ~ 10kg/t, fluorite add-on is 2 ~ 7kg/t, calcium carbide add-on is 0.2 ~ 1kg/t.
5. the electric furnace smelting method of steel for welding wire according to claim 1, it is characterized in that, in described continuous small-billet casting operation, secondary cooling zone takes four sections of cooling modes, the relation of each district water yield and pulling rate v is as follows: district's water yield is v × (55 ~ 65) L/min, two district's water yields are v × (68 ~ 78) L/min, and three district's water yields are v × (18 ~ 24) L/min, and four district's water yields are v × (14 ~ 20) L/min.
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