CN112410509A - Smelting and rolling process of 60SI2MN spring steel - Google Patents
Smelting and rolling process of 60SI2MN spring steel Download PDFInfo
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- CN112410509A CN112410509A CN202011264174.0A CN202011264174A CN112410509A CN 112410509 A CN112410509 A CN 112410509A CN 202011264174 A CN202011264174 A CN 202011264174A CN 112410509 A CN112410509 A CN 112410509A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 33
- 238000003723 Smelting Methods 0.000 title claims abstract description 32
- 229910000639 Spring steel Inorganic materials 0.000 title claims abstract description 27
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 126
- 229910052786 argon Inorganic materials 0.000 claims abstract description 63
- 238000007664 blowing Methods 0.000 claims abstract description 59
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 23
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 20
- 239000000956 alloy Substances 0.000 claims abstract description 20
- 239000005997 Calcium carbide Substances 0.000 claims abstract description 16
- 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 abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- 239000004088 foaming agent Substances 0.000 claims abstract description 12
- 238000010079 rubber tapping Methods 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910017082 Fe-Si Inorganic materials 0.000 claims abstract description 6
- 229910000616 Ferromanganese Inorganic materials 0.000 claims abstract description 6
- 229910017133 Fe—Si Inorganic materials 0.000 claims abstract description 6
- 230000000295 complement effect Effects 0.000 claims abstract description 6
- 229910052733 gallium Inorganic materials 0.000 claims abstract description 6
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000009628 steelmaking Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 33
- 238000005070 sampling Methods 0.000 claims description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 239000002893 slag Substances 0.000 claims description 16
- 238000009749 continuous casting Methods 0.000 claims description 13
- 238000009529 body temperature measurement Methods 0.000 claims description 12
- 238000007670 refining Methods 0.000 claims description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 10
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 10
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 239000010436 fluorite Substances 0.000 claims description 10
- 239000004571 lime Substances 0.000 claims description 10
- 238000009987 spinning Methods 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 229910000805 Pig iron Inorganic materials 0.000 claims description 5
- 238000005275 alloying Methods 0.000 claims description 5
- 238000005261 decarburization Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000010583 slow cooling Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005728 strengthening Methods 0.000 claims description 5
- 239000013589 supplement Substances 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 238000010301 surface-oxidation reaction Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a smelting and rolling process of 60SI2MN spring steel, which comprises the following steps: step 1, selecting raw materials: preparing deoxidizers such as Fe-Si, high-carbon ferromanganese, carburant, pure aluminum particles, calcium carbide (GaC2) or Si-Al-Ba-Ga, Al wire (containing 99.7 percent of Al), Ga-Fe wire and the like, and providing accurate alloy components and required quantity for alloy workers in front of a furnace during steel making; step 2, smelting in a converter: the point blowing times after high-tension complementary blowing are no more than 2, the coordinated tapping of C-T is ensured, and the addition amount of the aluminum deoxidizer is determined according to the end point carbon content in the rear of the furnace; according to the invention, the aluminum wires are quantitatively added in the argon blowing process, so that the aluminum wires are convenient to melt, and simultaneously, the deoxidation products in the molten steel can float upwards conveniently, and the gas contained in the molten steel is reduced; by adding the deoxidizing foaming agent, the fully discharging of the deoxidizing product is facilitated, and the use quality of the produced spring steel is improved to a certain extent.
Description
Technical Field
The invention relates to the technical field of spring steel production, in particular to a smelting and rolling process of 60SI2MN spring steel.
Background
The 60Si2Mn spring steel is widely applied silicon-manganese spring steel, and has strength, elasticity and hardenability slightly higher than 55Si2 Mn; the 60Si2Mn spring steel is used for manufacturing flat springs bearing large load or spiral springs with the wire diameter being less than 30mm, heat-resistant springs bearing working temperature being less than 250 ℃ in non-corrosive medium, large important coiled springs bearing alternating load and working under high stress, automobile damping systems and the like in the industry, the smelting and rolling process of the 60SI2MN spring steel directly influences the use quality of the 60SI2MN spring steel, and at present, all materials of the 60Si2Mn spring steel are usually added into a smelting furnace for smelting in the smelting process, so that the melting speed among the materials is influenced, various gases are generated simultaneously to a certain extent, the discharge of deoxidation products in molten steel is influenced, and the quality of the produced spring steel is influenced.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems occurring in the prior art.
In order to realize the aim, the smelting and rolling process of the 60SI2MN spring steel comprises the following steps:
step 1, selecting raw materials: preparing deoxidizers such as Fe-Si, high-carbon ferromanganese, carburant, pure aluminum particles, calcium carbide (GaC2) or Si-Al-Ba-Ga, Al wire (containing 99.7 percent of Al), Ga-Fe wire and the like, and providing accurate alloy components and required quantity for alloy workers in front of a furnace during steel making;
step 2, smelting in a converter: the number of point blowing after high-tension complementary blowing is no more than 2, the coordinated tapping of C-T is ensured, the adding amount of the aluminum deoxidizer is determined according to the carbon content at the end point behind the furnace, Si-Al-Ba-Ga and calcium carbide (GaC2) are properly added according to the adding amount of aluminum, 10-20 Kg/furnace is added to the calcium carbide (GaC2), and the (0) is ensured to be less than or equal to 60ppm and is sent to an argon station after deoxidation alloying after the furnace;
step 3, argon blowing: argon blowing time is more than 5min, the phi of the exposed molten steel is less than or equal to 500, sampling analysis is carried out after argon blowing is carried out for 3 min at 5.2.2, components are adjusted, oxygen is determined in the argon blowing process, aluminum wires are added according to specified amount, the content of 20 to 0 after argon is less than or equal to 30ppm, and the deoxidation product is ensured to be fully denatured and floated;
step 4, LF refining: adding 100Kg of deoxidizing foaming agent, gradually adding 50-100 Kg of fluorite and 600-800 Kg of lime after 8 or 9 grades of power transmission, supplementing 100Kg of deoxidizing foaming agent and continuing power transmission, determining the power transmission grade and the power transmission time according to the temperature measurement condition, ensuring that the total power transmission time is not less than 20 minutes, increasing the argon blowing amount when power is cut off, strengthening and stirring the uniform temperature, determining oxygen after the temperature component is qualified, and requiring that (0) is not more than 15ppm after refining;
step 5, continuous casting: the new tundish is required to be baked to be hot red, the superheat degree of the tundish molten steel is controlled within 20-35 ℃, the large tundish and the tundish are covered, the whole protective pouring is carried out in the continuous casting process, and the drawing speed is controlled within 2.3-2.6 m/min;
step 6, rolling: heating temperature is 1080-1120 ℃, a hearth maintains micro-positive pressure of 3-10 Pa, surface oxidation is reduced, decarburization is realized, rolling temperature is 1050-1080 ℃, finish rolling temperature is 950 +/-10 ℃, spinning temperature is 930 +/-20 ℃, cooling speed after spinning is controlled to be 1.0-2.5 ℃/s, uniform and slow cooling is realized, speed of the first section of an air cooling line is 0.30m/s, and the speed is gradually increased to 0.70m/s by 0.05m/s to be coiled.
Preferably, the alloy according to the step 1 is required to be clean and dry, scrap steel cannot contain miscellaneous pig iron and iron castings, light scrap is less than or equal to 60 percent, and the weight of a single block is less than 200 Kg.
Preferably, the oxygen supply is carried out by adopting a constant-voltage variable lance operation according to the step 2, the lance position is properly lowered in the middle and later periods, and the lance position is blown in the later period for not less than 30 seconds.
Preferably, the steel degree is 1630-1650, the arrival temperature is 1610-1630, and the ending temperature is 1600 according to step 2.
Preferably, according to the step 3, adding clean scrap steel and blowing argon for a furnace time with high arrival temperature and argon blowing time more than 5 minutes, sampling and analyzing after blowing argon for 3 minutes and adjusting components.
Preferably, argon blowing, sampling, temperature measurement and oxygen determination are carried out after the ladle enters the station according to the step 4.
Preferably, after 8-or 9-gear power transmission is carried out for 2-3 minutes according to the step 4, 3-or 4-gear power transmission is changed for about 8 minutes, and then sampling, temperature measurement and slag removal observation are carried out.
Preferably, whether to adjust the components is determined according to the sampling analysis result; and determining whether to supplement fluorite or lime to adjust the fluidity according to the fluidity of the slag sample; whether the deoxidizer is supplemented or not is determined according to the white slag degree.
Preferably, the continuous casting needs to be performed with long nozzle argon sealing according to the step 5, and the lower nozzle is immersed by 80-100 mm, the shallowest is not lower than 60mm, and the deepest is not more than 120 mm.
The invention has the following beneficial effects:
1. by quantitatively adding the aluminum wires in the argon blowing process, the aluminum wires are convenient to melt, and simultaneously, deoxidation products in molten steel can float upwards conveniently, so that gas contained in the molten steel is reduced;
2. by adding the deoxidizing foaming agent, the fully discharging of the deoxidizing product is facilitated, and the use quality of the produced spring steel is improved to a certain extent.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The smelting and rolling process of the 60SI2MN spring steel comprises the following steps:
step 1, selecting raw materials: preparing deoxidizers such as Fe-Si, high-carbon ferromanganese, carburant, pure aluminum particles, calcium carbide (GaC2) or Si-Al-Ba-Ga, Al wire (containing 99.7 percent of Al), Ga-Fe wire and the like, and providing accurate alloy components and required quantity for alloy workers in front of a furnace during steel making; molten iron (Si) is less than or equal to 0.60 percent, S is less than or equal to 0.015 percent, P is less than or equal to 0.10 percent
Step 2, smelting in a converter: the number of point blowing after high-tension complementary blowing is no more than 2, the coordinated tapping of C-T is ensured, the adding amount of the aluminum deoxidizer is determined according to the carbon content at the end point behind the furnace, Si-Al-Ba-Ga and calcium carbide (GaC2) are properly added according to the adding amount of aluminum, 10-20 Kg/furnace is added to the calcium carbide (GaC2), and the (0) is ensured to be less than or equal to 60ppm and is sent to an argon station after deoxidation alloying after the furnace;
step 3, argon blowing: argon blowing time is more than 5min, the phi of the exposed molten steel is less than or equal to 500, sampling analysis is carried out after argon blowing is carried out for 3 min at 5.2.2, components are adjusted, oxygen is determined in the argon blowing process, aluminum wires are added according to specified amount, the content of 20 to 0 after argon is less than or equal to 30ppm, and the deoxidation product is ensured to be fully denatured and floated;
step 4, LF refining: adding 100Kg of deoxidizing foaming agent, gradually adding 50-100 Kg of fluorite and 600-800 Kg of lime after 8 or 9 grades of power transmission, supplementing 100Kg of deoxidizing foaming agent and continuing power transmission, determining the power transmission grade and the power transmission time according to the temperature measurement condition, ensuring that the total power transmission time is not less than 20 minutes, increasing the argon blowing amount when power is cut off, strengthening and stirring the uniform temperature, determining oxygen after the temperature component is qualified, and requiring that (0) is not more than 15ppm after refining;
step 5, continuous casting: the new tundish is required to be baked to be hot red, the superheat degree of the tundish molten steel is controlled within 20-35 ℃, the large tundish and the tundish are covered, the whole protective pouring is carried out in the continuous casting process, and the drawing speed is controlled within 2.3-2.6 m/min;
step 6, rolling: heating temperature is 1080-1120 ℃, a hearth maintains micro-positive pressure of 3-10 Pa, surface oxidation is reduced, decarburization is realized, rolling temperature is 1050-1080 ℃, finish rolling temperature is 950 +/-10 ℃, spinning temperature is 930 +/-20 ℃, cooling speed after spinning is controlled to be 1.0-2.5 ℃/s, uniform and slow cooling is realized, speed of the first section of an air cooling line is 0.30m/s, and the speed is gradually increased to 0.70m/s by 0.05m/s to be coiled.
According to the alloy requirement of the step 1, the alloy is clean and dry, scrap steel cannot contain miscellaneous pig iron and iron castings, the light scrap is less than or equal to 60 percent, and the weight of a single block is less than 200 Kg.
And (3) oxygen supply is carried out by adopting a constant-voltage variable-lance operation according to the step (2), the lower lance position is properly arranged in the middle and later periods, and the lower lance position is blown in the later period for not less than 30 seconds.
According to the step 2, the steel degree is 1630-1650, the arrival temperature is 1610-1630, and the ending temperature is larger than or equal to 1600.
And (3) according to the step 3, adding clean steel scrap and blowing argon for a furnace time with high arrival temperature and argon blowing time more than 5 minutes, sampling and analyzing after blowing argon for 3 minutes and adjusting components.
And (4) blowing argon after the ladle enters the station according to the step 4, sampling, measuring the temperature and determining the oxygen.
And (4) after power transmission is carried out for 2-3 minutes according to the step 48 or 9, power transmission is changed to 3-4 for about 8 minutes, and then sampling, temperature measurement and slag removal observation are carried out.
Determining whether to adjust the components according to the sampling analysis result; and determining whether to supplement fluorite or lime to adjust the fluidity according to the fluidity of the slag sample; whether the deoxidizer is supplemented or not is determined according to the white slag degree.
And (5) performing argon sealing on the long nozzle according to the requirement in the step 5, and immersing the lower nozzle into the molten steel for 80-100 mm, wherein the shallowest part is not less than 60mm, and the deepest part is not more than 120 mm.
In the embodiment, the smelting component requirements of converter smelting in the step 2 are shown in table 1, and the smelting control is shown in table 2;
TABLE 160 SI2MN melting composition
Note: is not more than 0.35 percent (Ni) and not more than 0.25 percent (Cu).
A slagging system adopts a double-slag method;
③ component control suggestion [ Mn ]/[ Si ] is not less than 4.0;
fourthly, the oxygen supply is operated by a constant pressure lance, the lance position is properly lowered in the middle and later periods, and the lance position is blown in the later period for not less than 30 seconds.
Smelting 60SI2MN in the furnace 20 before the new furnace, 3 before the furnace after the repair furnace and the 1 st furnace of the new ladle;
TABLE 2
Example 2
The smelting and rolling process of the 60SI2MN spring steel comprises the following steps:
step 1, selecting raw materials: preparing deoxidizers such as Fe-Si, high-carbon ferromanganese, carburant, pure aluminum particles, calcium carbide (GaC2) or Si-Al-Ba-Ga, Al wire (containing 99.7 percent of Al), Ga-Fe wire and the like, and providing accurate alloy components and required quantity for alloy workers in front of a furnace during steel making;
step 2, smelting in a converter: the number of point blowing after high-tension complementary blowing is no more than 2, the coordinated tapping of C-T is ensured, the adding amount of the aluminum deoxidizer is determined according to the carbon content at the end point behind the furnace, Si-Al-Ba-Ga and calcium carbide (GaC2) are properly added according to the adding amount of aluminum, 10-20 Kg/furnace is added to the calcium carbide (GaC2), and the (0) is ensured to be less than or equal to 60ppm and is sent to an argon station after deoxidation alloying after the furnace;
step 3, argon blowing: argon blowing time is more than 5min, the phi of the exposed molten steel is less than or equal to 500, sampling analysis is carried out after argon blowing is carried out for 3 min at 5.2.2, components are adjusted, oxygen is determined in the argon blowing process, aluminum wires are added according to specified amount, the content of 20 to 0 after argon is less than or equal to 30ppm, and the deoxidation product is ensured to be fully denatured and floated;
step 4, LF refining: adding 100Kg of deoxidizing foaming agent, gradually adding 50-100 Kg of fluorite and 600-800 Kg of lime after 8 or 9 grades of power transmission, supplementing 100Kg of deoxidizing foaming agent and continuing power transmission, determining the power transmission grade and the power transmission time according to the temperature measurement condition, ensuring that the total power transmission time is not less than 20 minutes, increasing the argon blowing amount when power is cut off, strengthening and stirring the uniform temperature, determining oxygen after the temperature component is qualified, and requiring that (0) is not more than 15ppm after refining;
step 5, continuous casting: the new tundish is required to be baked to be hot red, the superheat degree of the tundish molten steel is controlled within 20-35 ℃, the large tundish and the tundish are covered, the whole protective pouring is carried out in the continuous casting process, and the drawing speed is controlled within 2.3-2.6 m/min;
step 6, rolling: heating temperature is 1080-1120 ℃, a hearth maintains micro-positive pressure of 3-10 Pa, surface oxidation is reduced, decarburization is realized, rolling temperature is 1050-1080 ℃, finish rolling temperature is 950 +/-10 ℃, spinning temperature is 930 +/-20 ℃, cooling speed after spinning is controlled to be 1.0-2.5 ℃/s, uniform and slow cooling is realized, speed of the first section of an air cooling line is 0.30m/s, and the speed is gradually increased to 0.70m/s by 0.05m/s to be coiled.
According to the alloy requirement of the step 1, the alloy is clean and dry, scrap steel cannot contain miscellaneous pig iron and iron castings, the light scrap is less than or equal to 60 percent, and the weight of a single block is less than 200 Kg.
And (3) oxygen supply is carried out by adopting a constant-voltage variable-lance operation according to the step (2), the lower lance position is properly arranged in the middle and later periods, and the lower lance position is blown in the later period for not less than 30 seconds.
According to the step 2, the steel degree is 1630-1650, the arrival temperature is 1610-1630, and the ending temperature is larger than or equal to 1600.
And (3) according to the step 3, adding clean steel scrap and blowing argon for a furnace time with high arrival temperature and argon blowing time more than 5 minutes, sampling and analyzing after blowing argon for 3 minutes and adjusting components.
And (4) blowing argon after the ladle enters the station according to the step 4, sampling, measuring the temperature and determining the oxygen.
And (4) after power transmission is carried out for 2-3 minutes according to the step 48 or 9, power transmission is changed to 3-4 for about 8 minutes, and then sampling, temperature measurement and slag removal observation are carried out.
Determining whether to adjust the components according to the sampling analysis result; and determining whether to supplement fluorite or lime to adjust the fluidity according to the fluidity of the slag sample; whether the deoxidizer is supplemented or not is determined according to the white slag degree.
And (5) performing argon sealing on the long nozzle according to the requirement in the step 5, and immersing the lower nozzle into the molten steel for 80-100 mm, wherein the shallowest part is not less than 60mm, and the deepest part is not more than 120 mm.
The temperature control of the smelting process in the embodiment is shown in Table 3, and the liquid phase temperature T1 is 1502 ℃; the argon blowing operation requirements are shown in Table 4
TABLE 3 Process temperature control (. degree. C.)
| Tapping temperature | Temperature of arrival | End temperature |
| 1630～1650 | 1610～1630 | ≥1600 |
Note: the temperature of more than or equal to 1600 ℃ is ensured to enter the refining furnace, and the casting time is executed according to the relevant regulations of the steel plant.
TABLE 4 argon blowing operating requirements
Example 3
The smelting and rolling process of the 60SI2MN spring steel comprises the following steps:
step 1, selecting raw materials: preparing deoxidizers such as Fe-Si, high-carbon ferromanganese, carburant, pure aluminum particles, calcium carbide (GaC2) or Si-Al-Ba-Ga, Al wire (containing 99.7 percent of Al), Ga-Fe wire and the like, and providing accurate alloy components and required quantity for alloy workers in front of a furnace during steel making;
step 2, smelting in a converter: the number of point blowing after high-tension complementary blowing is no more than 2, the coordinated tapping of C-T is ensured, the adding amount of the aluminum deoxidizer is determined according to the carbon content at the end point behind the furnace, Si-Al-Ba-Ga and calcium carbide (GaC2) are properly added according to the adding amount of aluminum, 10-20 Kg/furnace is added to the calcium carbide (GaC2), and the (0) is ensured to be less than or equal to 60ppm and is sent to an argon station after deoxidation alloying after the furnace;
step 3, argon blowing: argon blowing time is more than 5min, the phi of the exposed molten steel is less than or equal to 500, sampling analysis is carried out after argon blowing is carried out for 3 min at 5.2.2, components are adjusted, oxygen is determined in the argon blowing process, aluminum wires are added according to specified amount, the content of 20 to 0 after argon is less than or equal to 30ppm, and the deoxidation product is ensured to be fully denatured and floated;
step 4, LF refining: adding 100Kg of deoxidizing foaming agent, gradually adding 50-100 Kg of fluorite and 600-800 Kg of lime after 8 or 9 grades of power transmission, supplementing 100Kg of deoxidizing foaming agent and continuing power transmission, determining the power transmission grade and the power transmission time according to the temperature measurement condition, ensuring that the total power transmission time is not less than 20 minutes, increasing the argon blowing amount when power is cut off, strengthening and stirring the uniform temperature, determining oxygen after the temperature component is qualified, and requiring that (0) is not more than 15ppm after refining;
step 5, continuous casting: the new tundish is required to be baked to be hot red, the superheat degree of the tundish molten steel is controlled within 20-35 ℃, the large tundish and the tundish are covered, the whole protective pouring is carried out in the continuous casting process, and the drawing speed is controlled within 2.3-2.6 m/min;
step 6, rolling: heating temperature is 1080-1120 ℃, a hearth maintains micro-positive pressure of 3-10 Pa, surface oxidation is reduced, decarburization is realized, rolling temperature is 1050-1080 ℃, finish rolling temperature is 950 +/-10 ℃, spinning temperature is 930 +/-20 ℃, cooling speed after spinning is controlled to be 1.0-2.5 ℃/s, uniform and slow cooling is realized, speed of the first section of an air cooling line is 0.30m/s, and the speed is gradually increased to 0.70m/s by 0.05m/s to be coiled.
According to the alloy requirement of the step 1, the alloy is clean and dry, scrap steel cannot contain miscellaneous pig iron and iron castings, the light scrap is less than or equal to 60 percent, and the weight of a single block is less than 200 Kg.
And (3) oxygen supply is carried out by adopting a constant-voltage variable-lance operation according to the step (2), the lower lance position is properly arranged in the middle and later periods, and the lower lance position is blown in the later period for not less than 30 seconds.
According to the step 2, the steel degree is 1630-1650, the arrival temperature is 1610-1630, and the ending temperature is larger than or equal to 1600.
And (3) according to the step 3, adding clean steel scrap and blowing argon for a furnace time with high arrival temperature and argon blowing time more than 5 minutes, sampling and analyzing after blowing argon for 3 minutes and adjusting components.
And (4) blowing argon after the ladle enters the station according to the step 4, sampling, measuring the temperature and determining the oxygen.
And (4) after power transmission is carried out for 2-3 minutes according to the step 48 or 9, power transmission is changed to 3-4 for about 8 minutes, and then sampling, temperature measurement and slag removal observation are carried out.
Determining whether to adjust the components according to the sampling analysis result; and determining whether to supplement fluorite or lime to adjust the fluidity according to the fluidity of the slag sample; whether the deoxidizer is supplemented or not is determined according to the white slag degree.
And (5) performing argon sealing on the long nozzle according to the requirement in the step 5, and immersing the lower nozzle into the molten steel for 80-100 mm, wherein the shallowest part is not less than 60mm, and the deepest part is not more than 120 mm.
In this example, the requirements for continuous casting operation are shown in tables 5 and 6, and the mechanical property test is shown in Table 7
TABLE 5
TABLE 6
TABLE 7
Wire rod diameter tolerance: plus or minus 0.2mm and out-of-roundness less than or equal to 0.3mm
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A smelting and rolling process of 60SI2MN spring steel is characterized by comprising the following steps:
step 1, selecting raw materials: preparing deoxidizers such as Fe-Si, high-carbon ferromanganese, carburant, pure aluminum particles, calcium carbide (GaC2) or Si-Al-Ba-Ga, Al wire (containing 99.7 percent of Al), Ga-Fe wire and the like, and providing accurate alloy components and required quantity for alloy workers in front of a furnace during steel making;
step 2, smelting in a converter: the number of point blowing after high-tension complementary blowing is no more than 2, the coordinated tapping of C-T is ensured, the adding amount of the aluminum deoxidizer is determined according to the carbon content at the end point behind the furnace, Si-Al-Ba-Ga and calcium carbide (GaC2) are properly added according to the adding amount of aluminum, 10-20 Kg/furnace is added to the calcium carbide (GaC2), and the (0) is ensured to be less than or equal to 60ppm and is sent to an argon station after deoxidation alloying after the furnace;
step 3, argon blowing: argon blowing time is more than 5min, the phi of the exposed molten steel is less than or equal to 500, sampling analysis is carried out after argon blowing is carried out for 3 min at 5.2.2, components are adjusted, oxygen is determined in the argon blowing process, aluminum wires are added according to specified amount, the content of 20 to 0 after argon is less than or equal to 30ppm, and the deoxidation product is ensured to be fully denatured and floated;
step 4, LF refining: adding 100Kg of deoxidizing foaming agent, gradually adding 50-100 Kg of fluorite and 600-800 Kg of lime after 8 or 9 grades of power transmission, supplementing 100Kg of deoxidizing foaming agent and continuing power transmission, determining the power transmission grade and the power transmission time according to the temperature measurement condition, ensuring that the total power transmission time is not less than 20 minutes, increasing the argon blowing amount when power is cut off, strengthening and stirring the uniform temperature, determining oxygen after the temperature component is qualified, and requiring that (0) is not more than 15ppm after refining;
step 5, continuous casting: the new tundish is required to be baked to be hot red, the superheat degree of the tundish molten steel is controlled within 20-35 ℃, the large tundish and the tundish are covered, the whole protective pouring is carried out in the continuous casting process, and the drawing speed is controlled within 2.3-2.6 m/min;
step 6, rolling: heating temperature is 1080-1120 ℃, a hearth maintains micro-positive pressure of 3-10 Pa, surface oxidation is reduced, decarburization is realized, rolling temperature is 1050-1080 ℃, finish rolling temperature is 950 +/-10 ℃, spinning temperature is 930 +/-20 ℃, cooling speed after spinning is controlled to be 1.0-2.5 ℃/s, uniform and slow cooling is realized, speed of the first section of an air cooling line is 0.30m/s, and the speed is gradually increased to 0.70m/s by 0.05m/s to be coiled.
2. The process for smelting and rolling spring steel 60SI2MN according to claim 1, wherein the alloy in step 1 is clean and dry, scrap steel contains no miscellaneous pig iron or iron castings, light scrap is less than or equal to 60%, and single piece weight is less than 200 Kg.
3. The process for smelting and rolling 60SI2MN spring steel according to claim 1, wherein the oxygen supply is performed by constant pressure lance change operation according to step 2, the lance position is properly lowered in the middle and later stages, and the lance position is blown at the lower stage for not less than 30 seconds in the later stages.
4. The process for smelting and rolling 60SI2MN spring steel as claimed in claim 1, wherein the steel degree is 1630-1650, the arrival temperature is 1610-1630, and the ending temperature is 1600-hr.
5. The process for smelting and rolling spring steel 60SI2MN according to claim 1, wherein the step 3 is carried out by adding clean scrap steel and blowing argon for a heat time of more than 5 minutes at a high arrival temperature, and sampling and analyzing after blowing argon for 3 minutes and adjusting components.
6. The process for smelting and rolling 60SI2MN spring steel according to claim 1, wherein the ladle is blown with argon after entering the station according to step 4, and sampling, temperature measurement and oxygen determination are performed.
7. The smelting and rolling process of 60SI2MN spring steel according to claim 1, wherein the 8-grade or 9-grade steel is transmitted for 2-3 minutes, then the 3-grade or 4-grade steel is transmitted for about 8 minutes, and then sampling, temperature measurement, slag removal and observation are carried out.
8. A process for smelting and rolling 60SI2MN spring steel according to claim 7, wherein the adjustment of the composition is determined based on the results of sampling analysis; and determining whether to supplement fluorite or lime to adjust the fluidity according to the fluidity of the slag sample; whether the deoxidizer is supplemented or not is determined according to the white slag degree.
9. A smelting and rolling process of 60SI2MN spring steel according to claim 1, wherein the continuous casting process in step 5 requires argon sealing of the long nozzle, and the lower nozzle is immersed by 80-100 mm, the shallowest is not less than 60mm, and the deepest is not more than 120 mm.
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