CN115838845A - Smelting process of calendering roll 20CrNiMo steel for manufacturing photovoltaic glass - Google Patents
Smelting process of calendering roll 20CrNiMo steel for manufacturing photovoltaic glass Download PDFInfo
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- CN115838845A CN115838845A CN202211283134.XA CN202211283134A CN115838845A CN 115838845 A CN115838845 A CN 115838845A CN 202211283134 A CN202211283134 A CN 202211283134A CN 115838845 A CN115838845 A CN 115838845A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 52
- 239000010959 steel Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000003723 Smelting Methods 0.000 title claims abstract description 12
- 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 9
- 238000009749 continuous casting Methods 0.000 claims abstract description 40
- 239000002893 slag Substances 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 238000007670 refining Methods 0.000 claims abstract description 13
- 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
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000007664 blowing Methods 0.000 claims abstract description 7
- 238000005070 sampling 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
- 238000007872 degassing Methods 0.000 claims abstract description 4
- 238000005242 forging Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 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
- 238000009849 vacuum degassing Methods 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 18
- 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
- 229910052786 argon Inorganic materials 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
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 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
- 238000000137 annealing Methods 0.000 claims description 3
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 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
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 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
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to the technical field of steel making, and relates to a smelting process of calender roll 20crNiMo steel for manufacturing photovoltaic glass by using 785mm vertical continuous casting billets as raw materials, which adopts a process route of alkaline electric furnace-external refining-vacuum degassing-continuous casting, wherein the segregation of carbon content at the same position under the skin of the head and the tail of the continuous casting billet of the same master furnace is controlled within 0.01 percent, the utilization rate of a billet is increased to 90 percent from 80 percent of an ingot, a furnace charge consists of three-level and above-level waste steel, pig iron and carburant according to the proportion, oxygen blowing and slag flowing are subjected to dephosphorization operation after melting down, after tapping, the external furnace refining is performed after meeting the conditions, the chemical components are adjusted according to sampling results, after all alloys are adjusted, the vacuum degassing station is rotated to perform degassing, after the gas is finished, the continuous casting station is rotated to perform continuous casting, a vertical continuous casting is performed by using a vertical continuous casting machine, and after the billet is discharged, the billet is heated and forged in a forging workshop or is annealed to be reserved.
Description
Technical Field
The invention belongs to the technical field of steelmaking, and relates to a smelting process of calendering roll 20crNiMo steel for manufacturing photovoltaic glass by using a 785mm vertical continuous casting billet as a raw material.
Background
With the high-speed growth of economy and the increasing improvement of living standard of people in China, the demand of energy sources is also increasing. The development of renewable energy power generation has become a global consensus, several countries around the world have proposed "zero carbon" or "carbon neutralization" climate targets, the development of renewable energy including photovoltaics has become a global consensus, and the market demand for calender roll products for photovoltaic glass manufacturing has increased.
At present, the calendering roll 20CrNiMo steel for manufacturing photovoltaic glass is generally forged and formed by die-cast octagonal steel ingots, the steel ingots have serious chemical component segregation in the solidification process, especially the head and tail deviation of carbon content is large, so that the performance consistency of the calendering roll is poor, and the service life is difficult to ensure; the utilization rate of the ingot of the die-cast steel 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 the calendering roll 20CrNiMo steel for manufacturing the photovoltaic glass, which can control the segregation of the carbon content at the same position under the skin of the head and the tail of a continuous casting billet of the same primary furnace within 0.01 percent and improve the utilization rate of the billet from 80 percent of a steel ingot to 90 percent.
In order to achieve the purpose, the invention adopts the following technical scheme: a smelting process of a calendering roll 20CrNiMo steel for manufacturing photovoltaic glass adopts a process route of alkaline electric furnace-external furnace refining-vacuum degassing-continuous casting, and comprises the following steps:
step 1), furnace burden comprises 890-910 kg/t of scrap steel with three or more levels, 180-200 kg/t of pig iron and 5-15 kg/t of carburant, lime is added at 10-20 kg/t of furnace bottom before feeding, slag is removed while slag is dissolved out, components are sampled and analyzed at the temperature of more than or equal to 1580 ℃, and lime is added at 0-15 kg/t according to the content of [ P ] in steel; tapping conditions are as follows: the final points are less than or equal to 0.08 percent and 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 tapping 1/4-3/4;
step 2), switching on argon after the steel ladle is transferred to an external refining station, adding 5-10 kg/t of white ash, electrically electrolyzing slag, adding 1-2 kg/t of calcium carbide, 0.5-1.5 kg/t of carbon powder, ferrosilicon powder and silico-calcium powder deoxidizer respectively for deoxidation during the period, measuring the temperature and sampling after the slag is white; adjusting chemical components according to sampling results, adding 2.5-4.5 kg/t ferrosilicon, 10-15 kg/t high-carbon ferromanganese, 0-14 kg/t high-carbon ferrochrome, 0-14 kg/t low-carbon ferrochrome, 4-6 kg/t nickel plate and 3-5 kg/t ferromolybdenum, feeding 1-3 m/t aluminum wire and 1-3 m/t calcium-silicon wire respectively, carbon powder and 2-3 kg/t ferrosilicon powder for deoxidation and maintaining reducing atmosphere, after all the components and slag are adjusted, feeding the refining ladle into a vacuum tank degassing station, and controlling the temperature at 1660-1690 ℃;
step 3), switching on bottom blowing argon gas to stir after the refined steel ladle is transferred to a vacuum degassing station, keeping the time for not less than 20 minutes under the condition of not more than 0.7mbar, determining hydrogen and oxygen on line after breaking the air, controlling [ H ] to be not more than 1.5ppm and [ O ] to be not more than 5ppm, feeding calcium lines into the steel ladle according to 0.1-0.3 m/t during continuous casting, wherein the line feeding speed is not less than 120m/min, the argon blowing weak stirring time before tapping is not less than 15min, the temperature of first furnace molten steel is 1585-1595 ℃, and the temperature of secondary molten steel of a continuous casting furnace is 1575-1585 ℃ for transferring to a continuous casting station for continuous casting;
step 4), a double-flow vertical continuous casting machine is adopted as a continuous casting machine, molten steel is poured into a tundish after a refining ladle is transferred to a continuous casting station, when the amount of the molten steel in the tundish is controlled to be 15-25 tons, continuous casting is started to perform drawing, the temperature of the molten steel in the tundish is less than or equal to 1530 ℃ and is drawn according to 0.14m/min, the temperature of the molten steel in the tundish is 1531-1549 ℃ and is drawn according to 0.12m/min, and the temperature of the molten steel in the tundish is more than or equal to 1550 ℃ and is drawn according to 0.12 m/min;
and 5) after the billet is ejected, the billet is thermally conveyed to a forging shop to be heated and forged or is annealed at a transfer annealing station for later use.
The technical scheme of the invention has the following positive effects: the method can control the carbon content segregation at the same position under the skin of the head and the tail of the continuous casting billet of the same mother furnace within 0.01 percent, and the utilization rate of the billet is improved to 90 percent.
Detailed Description
Example 1: the method adopts the process route of alkaline electric furnace-external furnace refining-vacuum degassing-continuous casting, and comprises the following components in percentage by mass: [C] the method comprises the following steps 0.17 to 0.23%, [ Si ]: 0.17-0.37%, [ Mn ]: 0.60-1.00%, [ P ] less than or equal to 0.020%, [ S ] less than or equal to 0.010%, and [ Ni ]:0.20 to 1.00%, [ Cr ]:0.40 to 0.80%, [ Mo ]:0.20 to 0.40 percent, and the balance of Fe and trace residual elements.
The smelting process comprises the following steps:
step 1), furnace burden comprises 890-910 kg/t of scrap steel with three or more levels, 180-200 kg/t of pig iron and 5-15 kg/t of carburant, lime is added at 10-20 kg/t of furnace bottom before feeding, slag is removed while slag is dissolved out, components are sampled and analyzed at the temperature of more than or equal to 1580 ℃, and lime is added at 0-15 kg/t according to the content of [ P ] in steel; tapping conditions are as follows: the final points (C) is less than or equal to 0.08 percent, P is less than or equal to 0.010 percent, the tapping temperature is 1640-1660 ℃, molten steel is discharged into a refining ladle, 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 the tapping amount;
step 2), switching on argon after the steel ladle is transferred to an external refining station, adding 5-10 kg/t of white ash, electrically electrolyzing slag, adding 1-2 kg/t of calcium carbide, 0.5-1.5 kg/t of carbon powder, ferrosilicon powder and silico-calcium powder deoxidizer respectively for deoxidation during the period, measuring the temperature and sampling after the slag is white; adjusting chemical components according to sampling results, adding 2.5-4.5 kg/t ferrosilicon, 10-15 kg/t high-carbon ferromanganese, 0-14 kg/t high-carbon ferrochrome, 0-14 kg/t low-carbon ferrochrome, 4-6 kg/t nickel plate and 3-5 kg/t ferromolybdenum, feeding 1-3 m/t aluminum wire and 1-3 m/t calcium silicon wire respectively, deoxidizing and maintaining reducing atmosphere respectively for carbon powder and ferrosilicon powder, after all the components and slag are adjusted, feeding the refining ladle into a vacuum tank degassing station, and controlling the temperature to 1660-1690 ℃;
step 3), switching on bottom blowing argon gas to stir after the refined steel ladle is transferred to a vacuum degassing station, keeping the time for not less than 20 minutes under the condition of not more than 0.7mbar, determining hydrogen and oxygen on line after breaking the air, controlling [ H ] to be not more than 1.5ppm and [ O ] to be not more than 5ppm, feeding calcium lines into the steel ladle according to 0.1-0.3 m/t during continuous casting, wherein the line feeding speed is not less than 120m/min, the argon blowing weak stirring time before tapping is not less than 15min, the temperature of first furnace molten steel is 1585-1595 ℃, and the temperature of secondary molten steel of a continuous casting furnace is 1575-1585 ℃ for transferring to a continuous casting station for continuous casting;
step 4), a double-flow vertical continuous casting machine is adopted as a continuous casting machine, molten steel is poured into a tundish after a refining ladle is transferred to a continuous casting station, when the amount of the molten steel in the tundish is controlled to be 15-25 tons, continuous casting is started to perform drawing, the temperature of the molten steel in the tundish is less than or equal to 1530 ℃ and is drawn according to 0.14m/min, the temperature of the molten steel in the tundish is 1531-1549 ℃ and is drawn according to 0.12m/min, and the temperature of the molten steel in the tundish is more than or equal to 1550 ℃ and is drawn according to 0.12 m/min;
and 5) after the billet is ejected, the billet is thermally conveyed to a forging shop to be heated and forged or is annealed at a transfer annealing station for later use.
Two groups of smelting are carried out according to the smelting process of the embodiment, and the chemical component content of the products obtained by the two groups of smelting in the table 1 meets the target requirement:
TABLE 1 chemical composition m% (mass percentage)
The smelting process is only suitable for producing the continuous casting billet with the specification of 785mm of the lower calendering roller 20CrNiMo steel for manufacturing the photovoltaic glass by using the double-flow vertical continuous casting machine, and is used for ensuring that the chemical components of the continuous casting billets with different heats produced in the same batch are as consistent as possible.
Claims (1)
1. A smelting process of a calendering roll 20CrNiMo steel for manufacturing photovoltaic glass is characterized in that a process route of alkaline electric furnace-external furnace refining-vacuum degassing-continuous casting is adopted, and the smelting process comprises the following steps:
step 1), furnace burden comprises 890-910 kg/t of scrap steel with three or more levels, 180-200 kg/t of pig iron and 5-15 kg/t of carburant, lime is added at 10-20 kg/t of furnace bottom before feeding, slag is removed while slag is dissolved out, components are sampled and analyzed at the temperature of more than or equal to 1580 ℃, and lime is added at 0-15 kg/t according to the content of [ P ] in steel; tapping conditions are as follows: the final points are less than or equal to 0.08 percent and 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 tapping 1/4-3/4;
step 2), switching on argon after the steel ladle is transferred to an external refining station, adding 5-10 kg/t of white ash, electrically electrolyzing slag, adding 1-2 kg/t of calcium carbide, 0.5-1.5 kg/t of carbon powder, ferrosilicon powder and silico-calcium powder deoxidizer respectively for deoxidation during the period, measuring the temperature and sampling after the slag is white; adjusting chemical components according to sampling results, adding 2.5-4.5 kg/t ferrosilicon, 10-15 kg/t high-carbon ferromanganese, 0-14 kg/t high-carbon ferrochrome, 0-14 kg/t low-carbon ferrochrome, 4-6 kg/t nickel plate and 3-5 kg/t ferromolybdenum, feeding 1-3 m/t aluminum wire and 1-3 m/t calcium silicon wire respectively, deoxidizing and maintaining reducing atmosphere respectively for carbon powder and ferrosilicon powder, after all the components and slag are adjusted, feeding the refining ladle into a vacuum tank degassing station, and controlling the temperature to 1660-1690 ℃;
step 3), switching on bottom blowing argon gas to stir after the refined steel ladle is transferred to a vacuum degassing station, keeping the time for not less than 20 minutes under the condition of not more than 0.7mbar, determining hydrogen and oxygen on line after breaking the air, controlling [ H ] to be not more than 1.5ppm and [ O ] to be not more than 5ppm, feeding calcium lines into the steel ladle according to 0.1-0.3 m/t during continuous casting, wherein the line feeding speed is not less than 120m/min, the argon blowing weak stirring time before tapping is not less than 15min, the temperature of first furnace molten steel is 1585-1595 ℃, and the temperature of secondary molten steel of a continuous casting furnace is 1575-1585 ℃ for transferring to a continuous casting station for continuous casting;
step 4), a double-flow vertical continuous casting machine is adopted as a continuous casting machine, molten steel is poured into a tundish after a refining ladle is transferred to a continuous casting station, when the amount of the molten steel in the tundish is controlled to be 15-25 tons, continuous casting is started to perform drawing, the temperature of the molten steel in the tundish is less than or equal to 1530 ℃ and is drawn according to 0.14m/min, the temperature of the molten steel in the tundish is 1531-1549 ℃ and is drawn according to 0.12m/min, and the temperature of the molten steel in the tundish is more than or equal to 1550 ℃ and is drawn according to 0.12 m/min;
and 5) after the billet is ejected, the billet is thermally conveyed to a forging shop to be heated and forged or is annealed at a transfer annealing station for later use.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211283134.XA CN115838845B (en) | 2022-10-20 | 2022-10-20 | Smelting process of calendaring roller 20CrNiMo steel for manufacturing photovoltaic glass |
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| CN202211283134.XA CN115838845B (en) | 2022-10-20 | 2022-10-20 | Smelting process of calendaring roller 20CrNiMo steel for manufacturing photovoltaic glass |
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