CN115838845B - Smelting process of calendaring roller 20CrNiMo steel for manufacturing photovoltaic glass - Google Patents
Smelting process of calendaring roller 20CrNiMo steel for manufacturing photovoltaic glass Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000003723 Smelting Methods 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 239000011521 glass Substances 0.000 title claims abstract description 10
- 238000003490 calendering Methods 0.000 title claims description 8
- 238000009749 continuous casting Methods 0.000 claims abstract description 41
- 239000002893 slag Substances 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 238000007670 refining Methods 0.000 claims abstract description 14
- 238000010079 rubber tapping Methods 0.000 claims abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 238000005242 forging Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000000137 annealing Methods 0.000 claims abstract description 7
- 229910000805 Pig iron Inorganic materials 0.000 claims abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 239000001301 oxygen Substances 0.000 claims abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
- 239000004571 lime Substances 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 7
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 6
- 239000000378 calcium silicate Substances 0.000 claims description 6
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000009849 vacuum degassing Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 239000005997 Calcium carbide Substances 0.000 claims description 3
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims description 3
- 241001536352 Fraxinus americana Species 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 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 3
- 238000005204 segregation Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 238000005266 casting Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 238000007872 degassing Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 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
Abstract
The invention belongs to the technical field of steelmaking, and relates to a smelting process of a calender roll 20crNiMo steel for manufacturing photovoltaic glass, which is carried out by taking a 785mm standard vertical continuous casting blank as a raw material, adopting a process route of 'alkaline electric furnace-external refining-vacuum degassing-continuous casting', controlling carbon content segregation at the same position under the head and tail of a continuous casting blank of the same mother furnace within 0.01%, improving the utilization rate of the blank from 80% of a steel ingot to 90%, carrying out dephosphorization operation on furnace burden by blowing oxygen while casting slag after smelting and clearing more than three stages of waste steel, pig iron and carburant according to proportion, carrying out converter external furnace refining after tapping after meeting the conditions, adjusting chemical components according to sampling results, carrying out continuous casting by a continuous casting station after all alloys are adjusted, carrying out continuous casting by a vertical continuous casting machine, carrying out continuous casting after billet discharging, and carrying out hot forging or annealing by a forging workshop for standby.
Description
Technical Field
The invention belongs to the technical field of steelmaking, and relates to a smelting process of a calender roll 20crNiMo steel for manufacturing photovoltaic glass, which is performed by taking a 785mm standard vertical continuous casting blank as a raw material.
Background
Along with the high-speed increase of the economy in China and the increasing of the living standard of people, the energy demand is also increasing. The development of renewable energy sources for power generation has gradually become global unified will, various countries have proposed the climate targets of zero carbon or carbon neutralization, the development of renewable energy sources including photovoltaic has become global consensus, and the market demand for calender roll products for photovoltaic glass manufacturing has also increased.
At present, the calendaring roller 20CrNiMo steel for manufacturing the photovoltaic glass is generally formed by forging a cast octagonal steel ingot, the segregation of chemical components of the steel ingot is serious in the solidification process, particularly, the head and tail deviations of carbon content are large, so that the performance consistency of the calendaring roller is poor, and the service life of the calendaring roller is difficult to ensure; the utilization ratio phase of the ingot is only 80%, and is relatively low.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a production process of a calendaring roller 20CrNiMo steel for manufacturing photovoltaic glass, which can control the segregation of carbon content of the same position under the skin of the head and tail of a continuous casting blank of the same mother furnace to be within 0.01 percent, and the utilization rate of blanks is improved from 80 percent to 90 percent of steel ingots.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a smelting process of a calendaring roller 20CrNiMo steel for manufacturing photovoltaic glass adopts a process route of alkaline electric furnace-external refining-vacuum degassing-continuous casting, and the smelting process comprises the following steps:
Step 1), furnace burden comprises 890-910 kg/t of scrap steel with more than three stages, 180-200 kg/t of pig iron, 5-15 kg/t of carburant, 10-20 kg/t of lime is added to the bottom of the furnace before charging, slag flow and slag removal [ P ] are carried out while slag flow after dissolution, sampling analysis components are carried out at the temperature of more than or equal to 1580 ℃, and 0-15 kg/t of lime is added according to the [ P ] content in the steel; tapping conditions: the end point [ C ] is less than or equal to 0.08 percent, the end point [ P ] is less than or equal to 0.010 percent, the tapping temperature is 1640-1660 ℃, molten steel is discharged into a refining ladle, and 1-3 kg/t of aluminum blocks and 5-10 kg/t of lime are added into the ladle in the process of 1/4-3/4 of tapping amount;
Step 2), transferring the steel ladle to an external refining station, then switching on argon, adding 5-10 kg/t of white ash, feeding power to remove slag, adding 1-2 kg/t of calcium carbide, 0.5-1.5 kg/t of carbon powder, ferrosilicon powder and calcium silicate powder deoxidizer respectively for deoxidization, and measuring temperature and sampling after white slag; according to the sampling result, adjusting chemical components, adding 2.5-4.5 kg/t of ferrosilicon, 10-15 kg/t of high-carbon ferromanganese, 0-14 kg/t of high-carbon ferrochromium, 0-14 kg/t of low-carbon ferrochromium, 4-6 kg/t of nickel plate, 3-5 kg/t of ferromolybdenum, feeding aluminum wire, 1-3 m/t of calcium silicate wire, 2-3 kg/t of carbon powder and ferrosilicon powder for deoxidization and keeping reducing atmosphere, after all components and slag are adjusted, feeding a refined ladle into a vacuum tank degassing station, and controlling the temperature to 1660-1690 ℃;
step 3), after transferring the refining ladle to a vacuum degassing station, switching on bottom argon blowing stirring, keeping the time at less than or equal to 0.7mbar for more than or equal to 20 minutes, after breaking, carrying out online hydrogen and oxygen determination, controlling the content of [ H ] to less than or equal to 1.5ppm and the content of [ O ] to less than or equal to 5ppm, feeding a calcium wire into the ladle according to the ratio of 0.1-0.3 m/t during continuous casting, the feeding linear speed is more than or equal to 120m/min, the weak stirring time before tapping is more than or equal to 15 minutes, the primary furnace molten steel temperature is 1585-1595 ℃, and the continuous casting heat molten steel temperature is 1575-1585 ℃ for transferring the continuous casting station for continuous casting;
Step 4), the continuous casting machine adopts a double-flow vertical continuous casting machine, molten steel is poured into a tundish after a refining ladle is transferred to a continuous casting station, when the molten steel amount in the tundish is controlled to be 15-25 tons, continuous casting starts to draw a billet, the molten steel temperature in the tundish is less than or equal to 1530 ℃ and is drawn according to 0.14m/min, the molten steel temperature in the tundish is 1531-1549 ℃ and is drawn according to 0.12m/min, and the molten steel temperature in the tundish is more than or equal to 1550 ℃ and is drawn according to 0.12 m/min;
Step 5), hot conveying the steel billet to a forging workshop for heating forging or annealing in an annealing station for standby after the steel billet is removed.
The technical scheme of the invention has the following positive effects: the segregation of carbon content at the same position under the head and tail of the continuous casting blank of the same mother furnace can be controlled within 0.01%, and the utilization rate of the blank is improved to 90%.
Detailed Description
Example 1: adopts the process route of 'alkaline electric furnace-external refining-vacuum degassing-continuous casting', and the balance of Fe and trace residual elements according to the following ：[C]：0.17～0.23%,[Si]：0.17～0.37%,[Mn]：0.60～1.00%,[P]≤0.020%,[S]≤0.010%,[Ni]：0.20～1.00%,[Cr]：0.40～0.80%,[Mo]：0.20～0.40%, mass percent.
The smelting process comprises the following steps:
Step 1), furnace burden comprises 890-910 kg/t of scrap steel with more than three stages, 180-200 kg/t of pig iron, 5-15 kg/t of carburant, 10-20 kg/t of lime is added to the bottom of the furnace before charging, slag flow and slag removal [ P ] are carried out while slag flow after dissolution, sampling analysis components are carried out at the temperature of more than or equal to 1580 ℃, and 0-15 kg/t of lime is added according to the [ P ] content in the steel; tapping conditions: the end point [ C ] is less than or equal to 0.08 percent, the end point [ P ] is less than or equal to 0.010 percent, the tapping temperature is 1640-1660 ℃, molten steel is discharged into a refining ladle, and 1-3 kg/t of aluminum blocks and 5-10 kg/t of lime are added into the ladle in the process of 1/4-3/4 of tapping amount;
Step 2), transferring the steel ladle to an external refining station, then switching on argon, adding 5-10 kg/t of white ash, feeding power to remove slag, adding 1-2 kg/t of calcium carbide, 0.5-1.5 kg/t of carbon powder, ferrosilicon powder and calcium silicate powder deoxidizer respectively for deoxidization, and measuring temperature and sampling after white slag; according to the sampling result, adjusting chemical components, adding 2.5-4.5 kg/t of ferrosilicon, 10-15 kg/t of high-carbon ferromanganese, 0-14 kg/t of high-carbon ferrochromium, 0-14 kg/t of low-carbon ferrochromium, 4-6 kg/t of nickel plate, 3-5 kg/t of ferromolybdenum, feeding aluminum wire, 1-3 m/t of each of calcium silicate wire, 2-3 kg/t of carbon powder and ferrosilicon powder, deoxidizing and maintaining a reducing atmosphere, after all components and slag are adjusted, feeding a refined ladle into a vacuum tank degassing station, and controlling the temperature to 1660-1690 ℃;
step 3), after transferring the refining ladle to a vacuum degassing station, switching on bottom argon blowing stirring, keeping the time at less than or equal to 0.7mbar for more than or equal to 20 minutes, after breaking, carrying out online hydrogen and oxygen determination, controlling the content of [ H ] to less than or equal to 1.5ppm and the content of [ O ] to less than or equal to 5ppm, feeding a calcium wire into the ladle according to the ratio of 0.1-0.3 m/t during continuous casting, the feeding linear speed is more than or equal to 120m/min, the weak stirring time before tapping is more than or equal to 15 minutes, the primary furnace molten steel temperature is 1585-1595 ℃, and the continuous casting heat molten steel temperature is 1575-1585 ℃ for transferring the continuous casting station for continuous casting;
Step 4), the continuous casting machine adopts a double-flow vertical continuous casting machine, molten steel is poured into a tundish after a refining ladle is transferred to a continuous casting station, when the molten steel amount in the tundish is controlled to be 15-25 tons, continuous casting starts to draw a billet, the molten steel temperature in the tundish is less than or equal to 1530 ℃ and is drawn according to 0.14m/min, the molten steel temperature in the tundish is 1531-1549 ℃ and is drawn according to 0.12m/min, and the molten steel temperature in the tundish is more than or equal to 1550 ℃ and is drawn according to 0.12 m/min;
Step 5), hot conveying the steel billet to a forging workshop for heating forging or annealing in an annealing station for standby after the steel billet is removed.
Two groups of smelting are carried out according to the smelting process of the embodiment, and the chemical component content of products obtained by the two groups of smelting meets the target requirements:
table 1 chemical composition m% (mass percent)
The smelting process is only suitable for producing the continuous casting blank with the specification of 20CrNiMo steel 785mm for the lower calender roll for manufacturing the photovoltaic glass by using a double-flow vertical continuous casting machine, and chemical components of the continuous casting blanks with different furnace times produced in the same batch are ensured to be as consistent as possible.
Claims (1)
1. A smelting process of a calendaring roller 20CrNiMo steel for manufacturing photovoltaic glass is characterized by adopting a process route of alkaline electric furnace-external refining-vacuum degassing-continuous casting, wherein the smelting process comprises the following steps:
Step 1), furnace burden comprises more than three levels of scrap steel 890-910 kg/t, pig iron 180-200 kg/t and carburant 5-15 kg/t, lime is added at the bottom of the furnace before charging by 10-20 kg/t, slag is removed while P is dissolved, the temperature is more than or equal to 1580 ℃ for sampling and analyzing components, and lime is added by 0-15 kg/t according to the P content in the steel; tapping conditions: the end point [ C ] is less than or equal to 0.08 percent, the end point [ P ] is less than or equal to 0.010 percent, the tapping temperature is 1640-1660 ℃, molten steel is discharged into a refining ladle, and 1-3 kg/t of aluminum blocks and 5-10 kg/t of lime are added into the ladle in the process of 1/4-3/4 of tapping amount;
Step 2), transferring the steel ladle to an external refining station, then switching on argon, adding 5-10 kg/t of white ash, feeding power to remove slag, adding 1-2 kg/t of calcium carbide, 0.5-1.5 kg/t of carbon powder, ferrosilicon powder and calcium silicate powder deoxidizer respectively for deoxidization, and measuring temperature and sampling after white slag; according to the sampling result, adjusting chemical components, adding 2.5-4.5 kg/t of ferrosilicon, 10-15 kg/t of high-carbon ferromanganese, 0-14 kg/t of high-carbon ferrochromium, 0-14 kg/t of low-carbon ferrochromium, 4-6 kg/t of nickel plate, 3-5 kg/t of ferromolybdenum, feeding aluminum wire, 1-3 m/t of each of calcium silicate wire, 2-3 kg/t of carbon powder and ferrosilicon powder to deoxidize and maintain a reducing atmosphere, after all components and slag are adjusted, feeding a refining ladle into a vacuum degassing station, and controlling the temperature to 1660-1690 ℃;
step 3), after transferring the refining ladle to a vacuum degassing station, switching on bottom argon blowing stirring, keeping the time at less than or equal to 0.7mbar for more than or equal to 20 minutes, after breaking, carrying out online hydrogen and oxygen determination, controlling the content of [ H ] to less than or equal to 1.5ppm and the content of [ O ] to less than or equal to 5ppm, feeding a calcium wire into the ladle according to the ratio of 0.1-0.3 m/t during continuous casting, the feeding linear speed is more than or equal to 120m/min, the weak stirring time before tapping is more than or equal to 15 minutes, the primary furnace molten steel temperature is 1585-1595 ℃, and the continuous casting heat molten steel temperature is 1575-1585 ℃ for transferring the continuous casting station for continuous casting;
Step 4), the continuous casting machine adopts a double-flow vertical continuous casting machine, molten steel is poured into a tundish after a refining ladle is transferred to a continuous casting station, when the molten steel amount in the tundish is controlled to be 15-25 tons, continuous casting starts to draw a billet, the molten steel temperature in the tundish is less than or equal to 1530 ℃ and is drawn according to 0.14m/min, the molten steel temperature in the tundish is 1531-1549 ℃ and is drawn according to 0.12m/min, and the molten steel temperature in the tundish is more than or equal to 1550 ℃ and is drawn according to 0.12 m/min;
Step 5), hot conveying the steel billet to a forging workshop for heating forging or annealing in an annealing station for standby after the steel billet is removed.
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