CN117737568A - Smelting method for welding wire steel ER50-6S calcium control - Google Patents
Smelting method for welding wire steel ER50-6S calcium control Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title abstract description 57
- 239000010959 steel Substances 0.000 title abstract description 57
- 238000000034 method Methods 0.000 title abstract description 30
- 238000003466 welding Methods 0.000 title abstract description 23
- 238000003723 Smelting Methods 0.000 title abstract description 20
- 239000011575 calcium Substances 0.000 title abstract description 20
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title abstract description 10
- 229910052791 calcium Inorganic materials 0.000 title abstract description 10
- 239000002893 slag Substances 0.000 abstract description 59
- 238000007664 blowing Methods 0.000 abstract description 23
- 238000010079 rubber tapping Methods 0.000 abstract description 22
- 238000003756 stirring Methods 0.000 abstract description 17
- 238000007670 refining Methods 0.000 abstract description 15
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 abstract description 9
- 238000006477 desulfuration reaction Methods 0.000 abstract description 8
- 230000023556 desulfurization Effects 0.000 abstract description 8
- 238000009749 continuous casting Methods 0.000 abstract description 7
- 230000001590 oxidative effect Effects 0.000 abstract description 7
- 229910004298 SiO 2 Inorganic materials 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 239000011819 refractory material Substances 0.000 abstract description 3
- 230000003749 cleanliness Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 229910045601 alloy Inorganic materials 0.000 description 18
- 239000000956 alloy Substances 0.000 description 18
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 14
- 229910010271 silicon carbide Inorganic materials 0.000 description 14
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 11
- 235000011941 Tilia x europaea Nutrition 0.000 description 11
- 239000004571 lime Substances 0.000 description 11
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 10
- 239000000378 calcium silicate Substances 0.000 description 9
- 229910052918 calcium silicate Inorganic materials 0.000 description 9
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000005275 alloying Methods 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- 229910000720 Silicomanganese Inorganic materials 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 3
- 239000010436 fluorite Substances 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000003607 modifier Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- -1 aluminum silicon iron Chemical compound 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- FHTCLMVMBMJAEE-UHFFFAOYSA-N bis($l^{2}-silanylidene)manganese Chemical compound [Si]=[Mn]=[Si] FHTCLMVMBMJAEE-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 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 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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Abstract
The invention discloses a smelting method for controlling calcium of welding wire steel ER50-6S, which comprises the following chemical components in percentage by mass: c:0.06-0.09%, si:0.8-1.0%, mn:1.4-1.7%, P.ltoreq.0.02%, S.ltoreq.0.02%, alt.ltoreq.0.005%, T.Ca.ltoreq.0.0008%, andother unavoidable components; the smelting method comprises KR desulfurization, converter smelting, converter tapping, LF refining and continuous casting, wherein the converter tapping process adopts 0.3-0.5 of ultra-low alkalinity and weak oxidizing slag system, and the LF refining becomes slag system to obtain slag alkalinity CaO/SiO 2 =1.0-1.5, mgo:10-15%, wherein the content of T.Fe+MnO is less than or equal to 3.5%, then the electrifying and the heating are started to enable the temperature of molten steel to reach a target value, then the ladle bottom blowing is adjusted to be in a soft stirring mode, the soft stirring is finished, and the molten steel is transported to continuous casting and pouring. The invention creatively designs the ultra-low alkalinity and weak oxidizing slag and slag-changing system control process, and reasonably controls the alkalinity, oxidizing property, components, energizing time and bottom blowing stirring intensity of the slag by stages, thereby ensuring that the T.Ca content is controlled at an extremely low level, reducing corrosion of refractory materials and ensuring the cleanliness of molten steel.
Description
Technical Field
The invention relates to a smelting method for controlling calcium of welding wire steel ER50-6S, belonging to the technical field of steelmaking.
Background
The welding wire is a welding material for filler metal and conductive wire, and is generally manufactured by directly drawing a welding wire base metal (i.e., welding wire steel) to Φ0.8-1.2 mm without annealing. With the improvement of the degree of automation of welding technology, the wire steel is required to have good drawing performance and welding performance. Wherein the Ca content in the welding wire steel directly affects the drawing stability and the welding spatter condition, and the Ca content in the welding wire steel needs to be reduced.
The fluctuation of Ca element content control of the welding wire steel ER50-6S in the LF smelting process is large, and when the Ca content is too high, the finished welding rod is easy to splash seriously in the using process, and the safety and the welding effect are influenced.
Disclosure of Invention
In order to solve the problems, the invention discloses a smelting method for controlling calcium in ER50-6S welding wire steel, which controls the Ca content in molten steel to be extremely low by the technical method provided by the invention, thereby effectively avoiding the splashing problem of welding wire steel products in the welding process, and the specific technical scheme is as follows:
a smelting method for controlling calcium of welding wire steel ER50-6S comprises the following chemical components in percentage by mass: c:0.06-0.09%, si:0.8-1.0%, mn:1.4 to 1.7 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.02 percent, alt is less than or equal to 0.005 percent, T.Ca is less than or equal to 0.0008 percent, and other unavoidable components;
the smelting method comprises the processes of KR desulfurization, converter smelting, converter tapping, LF refining and continuous casting, and specifically comprises the following steps:
step 1: KR desulfurization, after the molten iron is subjected to KR desulfurization, obtaining molten iron C:4.2-4.5%, si:0.3-0.65%, mn:0.10-0.35%, P is less than or equal to 0.12%, S is less than or equal to 0.005%, and the temperature is 1300-1360 ℃;
step 2: smelting in a converter, namely adding desulfurized molten iron and clean scrap steel into the converter for smelting, wherein the mass ratio of the scrap steel is 10-20%, and the smelting endpoint of the converter is molten steel C:0.02-0.05%, O:0.045-0.085%, P less than or equal to 0.018%, S less than or equal to 0.015%, and temperature over 1620 ℃;
step 3: when the converter is tapped, alloy is added according to the sequence of ferrosilicon and high silicon silicomanganese when the converter is tapped for 25%, calcium silicate synthetic slag is added when 60% of the tapping is performed, the alloy and the calcium silicate synthetic slag are all added before the tapping is finished, ladle bottom blowing stirring is started in the whole tapping process, silicon carbide is added to the slag surface after the tapping is finished, stirring is performed for 3-5min, the obtained slag has an alkalinity of 0.3-0.5, and the content of T.Fe+MnO is 4-6%, and then the slag is conveyed to LF refining treatment;
step 4: LF refining, sampling and measuring molten steel and slag chemical components, not electrifying, not adding alloy and slag, opening ladle bottom blowing and stirring, after molten steel and slag components are tested out, adding low-titanium low-aluminum ferrosilicon and metal manganese according to target components of steel types to adjust molten steel components to reach target components, and then adding lime, silicon carbide and modifier to adjust slag components to obtain slag alkalinity CaO/SiO 2 =1.0-1.5, mgo:10-15%, wherein the content of T.Fe+MnO is less than or equal to 3.5%, then the electrifying and the heating are started to enable the temperature of molten steel to reach a target value, then the ladle bottom blowing is adjusted to a soft stirring mode, the soft stirring is finished, and the molten steel is transported to continuous casting and pouring;
step 5: and (5) continuous casting protection pouring.
Further, in the step 2, the mass content of S in the clean scrap steel is less than or equal to 0.015%, the mass content of P is less than or equal to 0.02%, and the balance is Fe and other unavoidable components.
Further, in the step 3, the alloy components comprise ferrosilicon in percentage by mass: si:70-75%, P less than or equal to 0.025%, S less than or equal to 0.015%, and the balance of Fe and other unavoidable components; high silicon manganese: si:25-30%, mn:62-67%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, and the balance is Fe and other unavoidable components; silicon carbide: siC is more than or equal to 98 percent, and other unavoidable components; calcium silicate synthetic slag: caO:30-40% of SiO 2 :45-55%, mgO:5-10%, and the balance of unavoidable components.
Further, in the step 3, 4.5-5.5kg/t of ferrosilicon, 17-19kg/t of high silicon silicomanganese, 1.5-2.5kg/t of silicon carbide and 10-15kg/t of calcium silicate synthetic slag are added in the tapping process, the ladle bottom blowing is performed for 800-1000L/min in the tapping process, and the bottom blowing flow is 200-300NL/min after the tapping is finished.
Further, in the step 4, lime is calculated according to mass percent: caO more than or equal to 95 percent and other unavoidable components; silicon carbide: siC is more than or equal to 98 percent, and other unavoidable components; modifying agent: mgSiO 3 :30-40%, mgO:50-60%, and other unavoidable components.
Further, in the step 4, the LF refining inbound temperature is more than or equal to 1550 ℃, the LF refining inbound temperature is 100-150NL/min to a stage of waiting for testing components, the ladle bottom blowing flow is 200-250NL/min, the alloy is added to adjust molten steel components, the lime and silicon carbide are added to adjust slag components, the ladle bottom blowing flow is 150-200NL/min, the electrifying heating stage adopts a medium-intensity power supply mode, the heating speed is 1.5-2.5 ℃/min, the ladle bottom blowing flow is 150-200NL/min, the ladle bottom blowing flow in the soft stirring stage is 30-80NL/min, and the soft stirring time is more than or equal to 20min.
The working principle of the invention is as follows:
the invention provides a method for controlling the content of ER50-6S calcium in welding wire steel, and according to the method disclosed by the invention, the content of ER50-6S calcium in the welding wire steel can be controlled at an extremely low level.
Firstly, through measures such as KR molten iron desulfurization blowing, converter control scrap steel component and the like, the S content in molten steel after converter smelting is controlled to be at a reasonable level, so that LF refining does not need to produce high-alkalinity slag for desulfurization, and meanwhile, the P content in molten steel is also controlled to be at a lower level, thereby avoiding the problem of late addition of alloy back phosphorus.
Secondly, the converter tapping with low carbon and high oxidability is carried out, low-alkalinity synthetic slag is added in the tapping process, a large amount of slag operation can stabilize slag components, lime is not added, and a large amount of SiO is formed during deoxidization alloying of ferrosilicon and ferrosilicon manganese alloy 2 Floating up to enter slag, and adding proper amount of silicon carbide into the slag to deoxidize the slag, so as to avoid the problem of CaO increase of molten steel caused by using calcium carbide. Because the calcium silicate slag system with ultra-low alkalinity and weak oxidizing property is formed in the tapping process, calcium in molten steel is thoroughly oxidized, so that Ca element is controlled at an extremely low level, and T.Ca is less than or equal to 4ppm.
Finally, in the early stage of LF refining, the traditional operation is broken through, alloy and slag forming materials are not added, lime and slag forming materials are added to adjust slag components after the molten steel components reach the standards, the molten steel and slag components reach the standards, then the temperature is raised after the molten steel and slag components reach the standards, medium-strength power supply is adopted, the problem that the low-melting-point acid slag system is subjected to high-power supply, the local temperature is too high, and the slag is completely emulsified into the molten steel is avoided. In addition, when the temperature is raised by electrifying, the alkalinity of slag is properly improved, the oxidizing property is reduced, a magnesia modifier is added, the corrosion of a low-alkalinity slag system to a refractory material is prevented from being increased, the bottom blowing flow is weaker in the whole process, and the increase of the T.Ca content in molten steel caused by bringing a large amount of slag into CaO is avoided.
In conclusion, the T.CaO content in the molten steel is controlled at an extremely low level by combining the measures of controlling the alkalinity and the oxidizing property of slag, controlling ladle bottom blowing, controlling refining alloying and slagging, controlling the electrifying mode and the like in the converter tapping and LF refining processes.
The beneficial effects of the invention are as follows:
the invention creatively designs the ultra-low alkalinity slag-to-slag system control process, and by reasonably controlling the alkalinity, the oxidizing property and the components of the slag, the content of T.Ca is ensured to be controlled at an extremely low level, meanwhile, the corrosion of refractory materials is reduced, and the cleanliness of molten steel is ensured;
the invention has simple and convenient process operation and low cost, and forms a smelting method which is very easy to stably control the content of ER50-6S calcium in the welding wire steel.
The boiling point of Ca is 1484 ℃, and the volatilization of Ca in the early-stage alloy and slag is increased, so that the content of Ca in the later stage is reduced, and the splashing condition of the finished product is reduced.
Detailed Description
The invention is further elucidated below in connection with the specific embodiments. It should be understood that the following detailed description is merely illustrative of the invention and is not intended to limit the scope of the invention.
The process of the invention requires Ca: less than or equal to 0.0010 percent, and tapping C from a converter: alloying steel tapping from a converter at the temperature of 1600-1650 ℃ which is less than or equal to 0.05 percent: ferrosilicon: 450-550Kg (Si content: 73%), high silicon manganese: 2100-2300Kg (Si content: 27%, mn content: 64%), lime 300Kg, matching Si and Mn elements in place as much as possible during converter alloying, reducing refining supplement alloy, molten steel entering station LF, lime 200Kg, fluorite ball 100-150Kg, strictly forbidden middle and later supplement lime and fluorite ball, argon in the early stage of LF is controlled to 280-320NL/min, the middle stage is controlled to 240-260NL/min, the later stage is controlled to 220-240NL/min, bypass smelting is forbidden in the whole course, sampling is performed after the temperature is raised to more than or equal to 1540 ℃, components are timely adjusted according to the first sample, si supplement Mn is needed to be simultaneously performed, low titanium low aluminum silicon iron is used for single silicon supplement, components are in place when the second sample is taken, deoxidizer silicon iron powder and 95 silicon carbide are used for diffusion deoxidization during the temperature rising, the deoxidizer silicon iron powder and the alloy cannot be added into an argon port, the molten steel is prevented from being carburised, the reducing atmosphere is kept, any slag and alloy is forbidden in the later stage, and the final slag alkalinity is controlled to be 1.5-1.9 (note that fluorite ball is used).
The whole LF refining process adopts a medium-small bottom blowing control mode, the medium-small bottom blowing stirring is performed in a waiting stage, the slag is prevented from being brought into CaO, the alloy is added to adjust the components to properly increase the bottom blowing, but the alloy cannot be too strong, so that the alloy is ensured to be melted into the molten steel to be uniform in components, and the slag cannot be greatly rolled; when lime and silicon carbide are added to adjust slag components, bottom blowing with proper strength promotes slag reaction and melting, but molten steel cannot be greatly involved, and small bottom blowing in a soft stirring stage is used for removing molten steel inclusions, and slag cannot be involved into molten steel.
The invention is specifically as follows: step 1: KR desulfurization, after the molten iron is subjected to KR desulfurization, obtaining molten iron C:4.2-4.5%, si:0.3-0.65%, mn:0.10-0.35%, P is less than or equal to 0.12%, S is less than or equal to 0.005%, and the temperature is 1300-1360 ℃;
step 2: smelting in a converter, namely adding desulfurized molten iron and clean scrap steel into the converter for smelting, wherein the mass ratio of the scrap steel is 10-20%, and the smelting endpoint of the converter is molten steel C:0.02-0.05%, O:0.045-0.085%, P less than or equal to 0.018%, S less than or equal to 0.015%, and temperature over 1620 ℃; the mass content of S in the clean scrap steel is less than or equal to 0.015 percent, the mass content of P is less than or equal to 0.02 percent, and the balance is Fe and other unavoidable components.
Step 3: when the converter is tapped, alloy is added according to the sequence of ferrosilicon and high silicon silicomanganese when the converter is tapped for 25%, calcium silicate synthetic slag is added when 60% of the tapping is performed, the alloy and the calcium silicate synthetic slag are all added before the tapping is finished, ladle bottom blowing stirring is started in the whole tapping process, silicon carbide is added to the slag surface after the tapping is finished, stirring is performed for 3-5min, the obtained slag has an alkalinity of 0.3-0.5, and the content of T.Fe+MnO is 4-6%, and then the slag is conveyed to LF refining treatment; the alloy comprises the following components in percentage by mass: si:70-75%, P less than or equal to 0.025%, S less than or equal to 0.015%, and the balance of Fe and other unavoidable components; high silicon manganese: si:25-30%, mn:62-67%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, and the balance is Fe and other unavoidable components; silicon carbide: siC is more than or equal to 98 percent, and other unavoidable components; calcium silicate synthetic slag: caO:30-40% of SiO 2 :45-55%, mgO:5-10%, and the balance of unavoidable components. 4.5-5.5kg/t of ferrosilicon, 17-19kg/t of high silicon-manganese silicon, 1.5-2.5kg/t of silicon carbide, 10-15kg/t of calcium silicate synthetic slag and 800-1000L/min of ladle bottom blowing in the tapping process are added, and the bottom blowing flow is 200-300NL/min after tapping.
Step 4: LF refining, sampling and measuring molten steel and slag chemical components, not electrifying, not adding alloy and slag, opening ladle bottom blowing and stirring, after molten steel and slag components are tested out, adding low-titanium low-aluminum ferrosilicon and metal manganese according to target components of steel types to adjust molten steel components to reach target components, and then adding lime, silicon carbide and modifier to adjust slag components to obtain slag alkalinity CaO/SiO 2 =1.0-1.5, mgo:10-15%, wherein the content of T.Fe+MnO is less than or equal to 3.5%, then the power-on heating is started to enable the temperature of molten steel to reach a target value, and then the ladle is subjected to bottom blowingAdjusting to a soft stirring mode, and conveying molten steel to continuous casting pouring after soft stirring is finished; lime in mass percent: caO more than or equal to 95 percent and other unavoidable components; silicon carbide: siC is more than or equal to 98 percent, and other unavoidable components; modifying agent: mgSiO 3 :30-40%, mgO:50-60%, and other unavoidable components.
Step 5: and (5) continuous casting protection pouring.
The technical means disclosed by the scheme of the invention is not limited to the technical means disclosed by the technical means, and also comprises the technical scheme formed by any combination of the technical features.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (6)
1. A smelting method for controlling calcium of welding wire steel ER50-6S is characterized in that the welding wire steel ER50-6S comprises the following chemical components in percentage by mass: c:0.06-0.09%, si:0.8-1.0%, mn:1.4 to 1.7 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.02 percent, alt is less than or equal to 0.005 percent, T.Ca is less than or equal to 0.0008 percent, and other unavoidable components;
the smelting method comprises the processes of KR desulfurization, converter smelting, converter tapping, LF refining and continuous casting, and specifically comprises the following steps:
step 1: KR desulfurization, after the molten iron is subjected to KR desulfurization, obtaining molten iron C:4.2-4.5%, si:0.3-0.65%, mn:0.10-0.35%, P is less than or equal to 0.12%, S is less than or equal to 0.005%, and the temperature is 1300-1360 ℃;
step 2: smelting in a converter, namely adding desulfurized molten iron and clean scrap steel into the converter for smelting, wherein the mass ratio of the scrap steel is 10-20%, and the smelting endpoint of the converter is molten steel C:0.02-0.05%, O:0.045-0.085%, P less than or equal to 0.018%, S less than or equal to 0.015%, and temperature over 1620 ℃;
step 3: when the converter is tapped, alloy is added according to the sequence of ferrosilicon and high silicon silicomanganese when the converter is tapped for 25%, calcium silicate synthetic slag is added when 60% of the tapping is performed, the alloy and the calcium silicate synthetic slag are all added before the tapping is finished, ladle bottom blowing stirring is started in the whole tapping process, silicon carbide is added to the slag surface after the tapping is finished, stirring is performed for 3-5min, the obtained slag has an alkalinity of 0.3-0.5, and the content of T.Fe+MnO is 4-6%, and then the slag is conveyed to LF refining treatment;
step 4: LF refining, sampling and measuring molten steel and slag chemical components, not electrifying, not adding alloy and slag, opening ladle bottom blowing and stirring, after molten steel and slag components are tested out, adding low-titanium low-aluminum ferrosilicon and metal manganese according to target components of steel types to adjust molten steel components to reach target components, and then adding lime, silicon carbide and modifier to adjust slag components to obtain slag alkalinity CaO/SiO 2 =1.0-1.5, mgo:10-15%, wherein the content of T.Fe+MnO is less than or equal to 3.5%, then the electrifying and the heating are started to enable the temperature of molten steel to reach a target value, then the ladle bottom blowing is adjusted to a soft stirring mode, the soft stirring is finished, and the molten steel is transported to continuous casting and pouring;
step 5: and (5) continuous casting protection pouring.
2. The method for smelting welding wire steel ER50-6S with calcium control according to claim 1, wherein in the step 2, the mass content of S in the clean scrap steel is less than or equal to 0.015%, the mass content of P is less than or equal to 0.02%, and the balance is Fe and other unavoidable components.
3. The smelting method of the welding wire steel ER50-6S calcium control according to claim 1, wherein in the step 3, the alloy components comprise ferrosilicon in percentage by mass: si:70-75%, P less than or equal to 0.025%, S less than or equal to 0.015%, and the balance of Fe and other unavoidable components; high silicon manganese: si:25-30%, mn:62-67%, P is less than or equal to 0.015%, S is less than or equal to 0.01%, and the balance is Fe and other unavoidable components; silicon carbide: siC is more than or equal to 98 percent, and other unavoidable components; calcium silicate synthetic slag: caO:30-40% of SiO 2 :45-55%, mgO:5-10%, and the balance of unavoidable components.
4. The smelting method of the welding wire steel ER50-6S calcium control according to claim 1, wherein in the step 3, 4.5-5.5kg/t of ferrosilicon, 17-19kg/t of high silicon manganese, 1.5-2.5kg/t of silicon carbide, 10-15kg/t of calcium silicate synthetic slag are added in the tapping process, 800-1000L/min of ladle bottom blowing is performed in the tapping process, and the bottom blowing flow is 200-300NL/min after tapping is finished.
5. The smelting method of welding wire steel ER50-6S calcium control according to claim 1, wherein in the step 4, lime is calculated according to mass percent: caO more than or equal to 95 percent and other unavoidable components; silicon carbide: siC is more than or equal to 98 percent, and other unavoidable components; modifying agent: mgSiO 3 :30-40%, mgO:50-60%, and other unavoidable components.
6. The smelting method of the welding wire steel ER50-6S calcium control according to claim 1, wherein in the step 4, the LF refining inlet temperature is more than or equal to 1550 ℃, the LF refining inlet temperature is 100-150NL/min to a stage waiting for assay components, the alloy is added to adjust molten steel components, the ladle bottom blowing temperature is 200-250NL/min, lime and silicon carbide are added to adjust slag components, the ladle bottom blowing temperature is 150-200NL/min, a medium-intensity power supply mode is adopted in the electrifying heating stage, the heating speed is 1.5-2.5 ℃/min, the ladle bottom blowing temperature is 150-200NL/min, the ladle bottom blowing temperature in the soft stirring stage is 30-80NL/min, and the soft stirring time is more than or equal to 20min.
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