CN116855683A - 700L low-cost smelting process method for RH vacuum light treatment high-strength automobile steel - Google Patents
700L low-cost smelting process method for RH vacuum light treatment high-strength automobile steel Download PDFInfo
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- CN116855683A CN116855683A CN202310800180.0A CN202310800180A CN116855683A CN 116855683 A CN116855683 A CN 116855683A CN 202310800180 A CN202310800180 A CN 202310800180A CN 116855683 A CN116855683 A CN 116855683A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 61
- 239000010959 steel Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000003723 Smelting Methods 0.000 title claims abstract description 36
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000001301 oxygen Substances 0.000 claims abstract description 70
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 70
- 239000002893 slag Substances 0.000 claims abstract description 43
- 238000007664 blowing Methods 0.000 claims abstract description 36
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000005261 decarburization Methods 0.000 claims abstract description 24
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 24
- 239000011572 manganese Substances 0.000 claims abstract description 24
- 238000005275 alloying Methods 0.000 claims abstract description 18
- 238000010079 rubber tapping Methods 0.000 claims abstract description 18
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 16
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000009749 continuous casting Methods 0.000 claims abstract description 11
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 8
- 238000005245 sintering Methods 0.000 claims abstract description 8
- 229910000720 Silicomanganese Inorganic materials 0.000 claims abstract description 7
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 7
- 230000023556 desulfurization Effects 0.000 claims abstract description 7
- 238000009825 accumulation Methods 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
- 239000004571 lime Substances 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 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
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000002436 steel type Substances 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
- 239000002699 waste material Substances 0.000 claims 1
- 229910000914 Mn alloy Inorganic materials 0.000 abstract description 5
- 230000001590 oxidative effect Effects 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 238000005502 peroxidation Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000009628 steelmaking 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
- C21C7/10—Handling in a vacuum
-
- 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
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- C21C7/068—Decarburising
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a 700L low-cost smelting process method for RH vacuum light treatment high-strength automobile steel, which comprises the following steps: and after molten iron and scrap steel are charged into the converter, carrying out converter oxygen blowing decarburization, slag charge slag formation, converter blowing end point high-pulling carbon, converter tapping using high-manganese deoxidization alloying, LF power transmission heating, RH light treatment, oxygen blowing or sintering ore and manganese ore addition cyclic decarburization under RH vacuum atmosphere and low carbon oxygen accumulation conditions, RH silicomanganese and high-manganese alloying, LF heating slag formation desulfurization, soft blowing and continuous casting. According to the invention, a smelting process path is adjusted, an RH furnace circulation decarburization treatment link is added, a converter adopts high-carbon-drawing C tapping, the control range of 700L converter tapping carbon is improved from less than 0.05% to 0.09-0.13%, the terminal oxidizing property of the converter is reduced from 400-600ppm to 230ppm, a high-manganese alloy is used for replacing a low-manganese alloy, the consumption of deoxidizer is reduced after RH light treatment, LF heating cost and RH refractory cost are removed, and the comprehensive cost of accounting is reduced by more than 20 yuan/t.
Description
Technical Field
The invention relates to the technical field of materials and metallurgy, in particular to a 700L low-cost smelting process method for over-RH vacuum light treatment high-strength automobile steel.
Background
The existing high-strength automobile steel 700L smelting process flow comprises a converter, an LF refining furnace and a continuous casting machine, wherein the component design of the steel grade C is less than or equal to 0.08%, the oxygen content of molten steel at the end point of the converter is more than 500ppm, and the deoxidization alloying process needs to add low-carbon ferromanganese to reduce carburetion, so that the steel making iron material consumption, deoxidizer and alloy cost are higher;
further, in the prior art, the process route of converter smelting 700L steel grade is converter smelting, LF smelting and continuous casting; wherein, the molten iron condition: c4.60%, si 0.35%, mn 0.45%, P0.125%, C0.04% -0.05% of converter oxygen-blowing end carbon drawing, and end oxygen 400-600ppm, wherein low-carbon ferromanganese or metal manganese alloy is used for alloying converter tapping and fine adjustment of LF refined alloy; because the upper limit of the design of the component C of 700L steel grade is 0.08 percent, if the tapping C is more than 0.08 percent after refining smelting is finished, the degradation and judgment of molten steel are needed; the end point peroxidation of the existing process Cheng Zhuailu has high steel material consumption and deoxidization alloying cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a 700L low-cost smelting process method for the RH vacuum light treatment of high-strength automobile steel, which is used for transferring the peroxidation decarburization in the later period of converter smelting to the RH furnace for cyclic decarburization when the high-strength automobile steel 700L is produced, improving the endpoint C of the converter and reducing the endpoint oxidizing property of molten steel; meanwhile, the problems of exceeding C of converter tapping and exceeding C of the smelting of the deoxidized alloy and LF furnace are solved.
In order to achieve the aim, the invention discloses a 700L low-cost smelting process method for RH vacuum light treatment high-strength automobile steel, which comprises the following steps:
and after molten iron and scrap steel are charged into the converter, carrying out converter oxygen blowing decarburization, slag charge slag formation, converter blowing end point high-pulling carbon, converter tapping using high-manganese deoxidization alloying, LF power transmission heating, RH light treatment, oxygen blowing or sintering ore and manganese ore addition cyclic decarburization under RH vacuum atmosphere and low carbon oxygen accumulation conditions, RH silicomanganese and high-manganese alloying, LF heating slag formation desulfurization, soft blowing and continuous casting.
In some embodiments, 20kg/t kiln slag, 10kg/t sinter and 15kg/t magnetic separation steel slag powder are charged in a steel scrap bucket in the converter charging process, after the steel scrap bucket is charged into the converter, the converter is rocked for 2 times according to the angle of 45 degrees to 0 degrees to 70 degrees to 0 degrees to 110 degrees to 45 degrees, the material is baked fully, 1020kg/t molten iron is added into the converter through a hot metal tank, and after the iron addition is finished, the converter returns to a zero-position oxygen reduction gun for converting.
In some embodiments, the converter blows 0-45S, and the soft blowing oxygen flow is 18000-20000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is 1300-1500mm, the converter blows for 45s-100s, and the oxygen lance oxygen blowing flow is 26000-28000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is reduced to 1250-1300mm, and auxiliary materials are not added in the process.
In some embodiments, the converter blows for 100-700s, and the oxygen lance blows oxygen flow 25000-27000m 3 And/h, lifting the height of the oxygen lance from the liquid level of the molten pool to 1200-1300mm; 25kg/t lime, 15kg/t limestone and 15kg/t dolomite are added during converting 140-160S, and 5-10kg/t sinter and iron scale slag are added according to the slag melting condition;
in some of these embodiments, the converter converting 700S to 720S make sublance TSC measurements, oxygen lance flow 19000-21000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is reduced to 1150-1250mm;
in some embodiments, the converter blows 720S to the end of the blowing, and the oxygen lance blows an oxygen flow of 28000-30000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is reduced to 1150-1250mm, and when the decarburization of the end point C of the converter enters the range of 0.13-0.0.09%, the oxygen lance is closed, the blowing of the oxygen lance is finished, and the converter is tapped.
In some embodiments, when the converter is tapped for 1/3 of the converter tapping process, 4.5kg/t high-carbon ferromanganese and 2kg/t slag lime are added into the ladle through a rotary chute in a high-level bin, and the argon station temperature is more than or equal to 1560 ℃.
In some embodiments, the molten steel is hoisted to LF to transmit power and raise temperature, and a proper amount of 1.5kg/t lime and 0.2kg/t calcium carbide slag can be supplemented according to the submerged arc effect, and after the temperature is raised, the tapping temperature is 1600-1605 ℃.
In some embodiments, the molten steel is lifted to an RH furnace, the temperature is controlled to 1590-1595 ℃, oxygen is blown by an RH oxygen lance or 100-200kg of sinter or manganese ore is added for cyclic decarburization to 0.01%, and 6kg/t of silicomanganese and 6kg/t of high manganese are added for alloying.
In some embodiments, the molten steel is lifted to LF, raised to be within 0.003 percent, the alloy is finely adjusted to the range required by steel type components, the steel slag is determined to be yellow and white slag, then the steel slag is fed into a metal calcium wire 100-150 m/furnace, argon protection is carried out during wire feeding, and the steel slag is cast by a continuous casting machine after smelting.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the invention, a smelting process path is adjusted, an RH furnace circulation decarburization treatment link is added, a converter adopts high-carbon-drawing C tapping, the control range of 700L converter tapping carbon is improved from less than 0.05% to 0.09-0.13%, the terminal oxidizing property of the converter is reduced from 400-600ppm to 230ppm, a high-manganese alloy is used for replacing a low-manganese alloy, the consumption of deoxidizer is reduced after RH light treatment, LF heating cost and RH refractory cost are removed, and the comprehensive cost of accounting is reduced by more than 20 yuan/t.
Detailed Description
The present invention will be specifically described below by way of exemplary embodiments. It is to be understood that structures and features in one embodiment may be beneficially incorporated in other embodiments without further recitation.
The embodiment of the invention discloses a 700L low-cost smelting process method for over-RH vacuum light treatment high-strength automobile steel, which comprises the following steps: and after molten iron and scrap steel are charged into the converter, carrying out converter oxygen blowing decarburization, slag charge slag formation, converter blowing end point high-pulling carbon, converter tapping using high-manganese deoxidization alloying, LF power transmission heating, RH light treatment, oxygen blowing or sintering ore and manganese ore addition cyclic decarburization under RH vacuum atmosphere and low carbon oxygen accumulation conditions, RH silicomanganese and high-manganese alloying, LF heating slag formation desulfurization, soft blowing and continuous casting.
The RH light treatment sintering ore is decarbonized, and the sintering ore comprises the following components in percentage by weight: 55-56% of TFe, 7-10% of FeO, 10% of CaO, less than or equal to 5.5% of SiO2, less than or equal to 0.015% of S, less than or equal to 0.070% of P, less than or equal to 2.5% of Al2O3 and less than or equal to 2.3% of MgO.
Wherein RH light treatment manganese ore decarburization, the manganese ore comprises the following components in percentage by weight: 43-45% of MnO, 15-17% of TFe, 5.5% of CaO, less than or equal to 4% of SiO2, less than or equal to 0.015% of S, less than or equal to 0.030% of P, less than or equal to 1% of Al2O3 and less than or equal to 1% of MgO.
Wherein, 20kg/t kiln slag, 10kg/t sinter and 15kg/t magnetic separation steel slag powder are charged in a steel ladle in the converter charging process, the converter shakes the furnace for 2 times according to the angle of 45 DEG to 0 DEG to-70 DEG to 0 DEG to 110 DEG to 45 DEG after the charging, the material is baked fully, 1020kg/t molten iron is added into the converter through a hot metal tank, and the converter returns to zero after the iron charging is finished to reduce oxygen lance blowing.
Wherein, the converter blows for 0-45S, and the soft blowing oxygen flow is 18000-20000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is 1300-1500mm, the converter blows for 45s-100s, and the oxygen lance oxygen blowing flow is 26000-28000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is reduced to 1250-1300mm, and auxiliary materials are not added in the process.
Wherein, the converter blows for 100-700s, and the oxygen flow of the oxygen lance blows for 25000-27000m 3 And/h, lifting the height of the oxygen lance from the liquid level of the molten pool to 1200-1300mm; 25kg/t lime, 15kg/t limestone and 15kg/t dolomite are added during converting 140-160S, and 5-10kg/t sinter and iron scale slag are added according to the slag melting condition;
wherein, the converter blows 700S to 720S to measure TSC of sublance, and the oxygen flow of oxygen lance is 19000-21000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is reduced to 1150-1250mm;
wherein the converter blows 720S to the end of blowing, and the oxygen flow of the oxygen lance blows 28000-30000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is reduced to 1150-1250mm, and when the decarburization of the end point C of the converter enters the range of 0.13-0.0.09%, the oxygen lance is closed, the blowing of the oxygen lance is finished, and the converter is tapped.
Wherein, when the converter is tapped for 1/3 of the converter tapping process, 4.5kg/t high-carbon ferromanganese and 2kg/t slag lime are added into the steel ladle through a rotary chute in a high-level bin, and the argon station temperature is more than or equal to 1560 ℃.
The molten steel is hoisted to LF to be fed with power and heated, a proper amount of lime of 1.5kg/t and calcium carbide of 0.2kg/t can be supplemented for slag formation according to the submerged arc effect, and after the temperature is raised, the tapping temperature is 1600-1605 ℃.
The molten steel is lifted to an RH furnace, the temperature of the molten steel reaches 1590-1595 ℃, oxygen is blown by an RH oxygen lance or 100-200kg of sintered ore or manganese ore is added for cyclic decarburization to 0.01%, and 6kg/t of silicomanganese and 6kg/t of high manganese are added for alloying.
The molten steel is lifted to the LF temperature rise, slagging and desulfurization are carried out to the extent that the content of the alloy is within 0.003%, the alloy is finely adjusted to the required range of steel types, the steel slag is determined to be yellow and white slag, then the steel slag is fed into a metal calcium wire 100-150 m/furnace, argon protection is carried out during wire feeding, and casting is carried out on the steel slag by a continuous casting machine after smelting is finished.
In summary, the 700L low-cost smelting process method for the over-RH vacuum light treatment high-strength automobile steel provided by the embodiment of the invention relates to the process paths of converter smelting, RH light treatment smelting and LF smelting: converter smelting, LF heating, RH light treatment smelting, LF smelting and continuous casting; the specific process flow is as follows: charging molten iron and scrap steel, blowing oxygen for decarburization of a converter, slag charge slagging, high carbon drawing at the converting end point of the converter, high manganese deoxidization alloying for converter tapping, LF power transmission heating-RH light treatment oxygen blowing or sintering ore and manganese ore decarburization, RH silicon manganese and high manganese alloying, LF heating slag formation desulfurization, soft blowing and continuous casting.
In order to improve the converter endpoint C and reduce endpoint oxygen, the decarburization task of the converter endpoint part is transferred to the RH light treatment process, oxygen blowing decarburization or sintering ore and manganese ore addition circulation decarburization are carried out under the RH vacuum atmosphere and low-carbon oxygen accumulation conditions, the oxygen content of molten steel is synchronously reduced, and the deoxidization alloying cost is reduced by using high-carbon ferromanganese alloying.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A700L low-cost smelting process method for RH vacuum light treatment high-strength automobile steel is characterized by comprising the following steps of: the method comprises the following steps: and after molten iron and scrap steel are charged into the converter, carrying out converter oxygen blowing decarburization, slag charge slag formation, converter blowing end point high-pulling carbon, converter tapping using high-manganese deoxidization alloying, LF power transmission heating, RH light treatment, oxygen blowing or sintering ore and manganese ore addition cyclic decarburization under RH vacuum atmosphere and low carbon oxygen accumulation conditions, RH silicomanganese and high-manganese alloying, LF heating slag formation desulfurization, soft blowing and continuous casting.
2. The over-RH vacuum light processing high strength automotive steel 700L low cost smelting process according to claim 1, wherein: in the converter charging process, a waste steel bucket is charged with 20kg/t kiln slag, 10kg/t sinter and 15kg/t magnetic steel slag powder, after the charging is carried out, the converter is rocked for 2 times according to the angle of 45 degrees to 0 degrees to 70 degrees to 0 degrees to 110 degrees to 45 degrees, the materials are baked fully, 1020kg/t molten iron is added into the converter through a hot metal tank, and after the iron addition is finished, the converter returns to zero and reduces oxygen lance for blowing.
3. The over-RH vacuum light processing high strength automotive steel 700L low cost smelting process according to claim 1, wherein: converting the materials into 0-45S, and blowing oxygen flow rate of 18000-20000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is 1300-1500mm, the converter blows for 45s-100s, and the oxygen lance oxygen blowing flow is 26000-28000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is reduced to 1250-1300mm, and auxiliary materials are not added in the process.
4. The over-RH vacuum light processing high strength automotive steel 700L low cost smelting process according to claim 1, wherein: converting for 100-700s, and controlling oxygen flow 25000-27000m 3 And/h, lifting the height of the oxygen lance from the liquid level of the molten pool to 1200-1300mm; 25kg/t lime, 15kg/t limestone and 15kg/t dolomite are added during converting 140-160S, and 5-10kg/t sinter and iron scale are added according to the slag melting condition for slag mixing.
5. According to claim 1The 700L low-cost smelting process method for the RH vacuum light-treatment high-strength automobile steel is characterized by comprising the following steps of: the converter blows 700S to 720S to measure TSC of sublance, and the oxygen flow of oxygen lance is 19000-21000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is reduced to 1150-1250mm.
6. The over-RH vacuum light processing high strength automotive steel 700L low cost smelting process according to claim 1, wherein: the converter blows 720S to the end of blowing, and the oxygen flow of the oxygen lance blows 28000-30000m 3 And/h, the height of the oxygen lance from the liquid level of the molten pool is reduced to 1150-1250mm, and when the decarburization of the end point C of the converter enters the range of 0.13-0.0.09%, the oxygen lance is closed, the blowing of the oxygen lance is finished, and the converter is tapped.
7. The over-RH vacuum light processing high strength automotive steel 700L low cost smelting process according to claim 1, wherein: when the converter is tapped for 1/3 of the tapping process, 4.5kg/t high-carbon ferromanganese and 2kg/t slag lime are added into the steel ladle through a rotary chute in a high-level bin, and the argon station temperature is more than or equal to 1560 ℃.
8. The over-RH vacuum light processing high strength automotive steel 700L low cost smelting process according to claim 1, wherein: the molten steel is hung to LF to be fed with power and heated, and proper amount of lime of 1.5kg/t and calcium carbide of 0.2kg/t can be supplemented for slagging according to the submerged arc effect, and after the temperature is raised, the tapping temperature is 1600-1605 ℃.
9. The over-RH vacuum light processing high strength automotive steel 700L low cost smelting process according to claim 1, wherein: and (3) lifting the molten steel to an RH furnace, controlling the temperature to 1590-1595 ℃, blowing oxygen by using an RH oxygen lance or adding 100-200kg of sinter or manganese ore for cyclic decarburization to 0.01%, and then adding 6kg/t of silicomanganese and 6kg/t of high manganese for alloying.
10. The over-RH vacuum light processing high strength automotive steel 700L low cost smelting process according to claim 1, wherein: the molten steel is lifted to the LF temperature rise, slagging and desulfurization to be within 0.003%, the alloy is finely adjusted to the range required by steel type components, the steel slag is determined to be yellow and white slag, then the steel slag is fed into a metal calcium wire 100-150 m/furnace, argon protection is carried out during wire feeding, and the steel slag is cast by a continuous casting machine after smelting.
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| CN202310800180.0A CN116855683A (en) | 2023-07-03 | 2023-07-03 | 700L low-cost smelting process method for RH vacuum light treatment high-strength automobile steel |
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| CN202310800180.0A CN116855683A (en) | 2023-07-03 | 2023-07-03 | 700L low-cost smelting process method for RH vacuum light treatment high-strength automobile steel |
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