CN115747420B - Three-step slag adjusting method suitable for refining high-manganese high-aluminum steel - Google Patents
Three-step slag adjusting method suitable for refining high-manganese high-aluminum steel Download PDFInfo
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- 239000002893 slag Substances 0.000 title claims abstract description 84
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 78
- 238000007670 refining Methods 0.000 title claims abstract description 74
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 239000011572 manganese Substances 0.000 title claims abstract description 65
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000003723 Smelting Methods 0.000 claims abstract description 14
- 238000007664 blowing Methods 0.000 claims abstract description 13
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 230000003749 cleanliness Effects 0.000 claims abstract description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 238000005266 casting Methods 0.000 claims abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 22
- 229910001570 bauxite Inorganic materials 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 10
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 10
- 239000004571 lime Substances 0.000 claims description 10
- 239000005997 Calcium carbide Substances 0.000 claims description 7
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 7
- 239000010436 fluorite Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 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 7
- 238000005275 alloying Methods 0.000 claims description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000011112 process operation Methods 0.000 claims description 6
- 238000001179 sorption measurement Methods 0.000 claims description 6
- IWBUYGUPYWKAMK-UHFFFAOYSA-N [AlH3].[N] Chemical compound [AlH3].[N] IWBUYGUPYWKAMK-UHFFFAOYSA-N 0.000 claims description 3
- CQBLUJRVOKGWCF-UHFFFAOYSA-N [O].[AlH3] Chemical compound [O].[AlH3] CQBLUJRVOKGWCF-UHFFFAOYSA-N 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 claims description 2
- 230000023556 desulfurization Effects 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 claims 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 abstract description 11
- 229910000914 Mn alloy Inorganic materials 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- 238000012797 qualification Methods 0.000 abstract description 5
- 229910000851 Alloy steel Inorganic materials 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 238000009834 vaporization Methods 0.000 abstract description 2
- 230000008016 vaporization Effects 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a refining three-step slag adjusting method suitable for high-manganese high-aluminum steel, which is used for adjusting the metallurgical characteristics of refining slag according to metallurgical requirements at different stages in the high-manganese high-aluminum steel smelting process flow, so that the refining slag can exert the maximum metallurgical effect, the cleanliness control requirement of the high-manganese high-aluminum steel is met, and the yield and qualification rate of the high-manganese high-aluminum steel alloy are improved; in the LF refining stage, a large amount of manganese alloy is matched with the high-manganese high-aluminum steel, the refining slag system should rapidly form slag, and foreign impurities and deoxidized products brought by the alloy into molten steel are effectively adsorbed at the same time, so that the purity of the molten steel is ensured; in the vacuum refining stage, the vacuum is easy to cause the vaporization and overflow of manganese, the refining slag system has certain viscosity, the manganese loss is reduced, and the smooth removal of nitrogen in steel is ensured; in the aluminum alloy adding and soft blowing stage, the refining slag system can effectively prevent aluminum nitride and aluminum oxide inclusion from being generated, isolate air and ensure smooth casting of the high-manganese high-aluminum steel.
Description
Technical Field
The invention relates to the field of smelting technology, in particular to a three-step slag adjusting method suitable for refining high-manganese high-aluminum steel.
Background
The high-manganese high-aluminum steel has large alloy quantity and high aluminum content, and is manufactured by adopting a special smelting process, and particularly higher cleanliness is required to be ensured. The alloy quantity of the high-manganese high-aluminum steel is large, so that the alloy brings more foreign impurities into the molten steel; meanwhile, the aluminum content in the steel is high, aluminum oxide and aluminum nitride inclusions are easy to generate, particularly aluminum nitride inclusions are easy to gather and delaminate, so that the stress of the finished steel is concentrated and even delaminated, and the mechanical property of the high-manganese high-aluminum steel is unqualified.
Disclosure of Invention
The invention aims to provide a refining three-step slag adjusting method suitable for high-manganese high-aluminum steel, which is used for adjusting the metallurgical characteristics of refining slag according to metallurgical requirements at different stages in the high-manganese high-aluminum steel smelting process flow, so that the refining slag can exert the maximum metallurgical effect, the cleanliness control requirement of the high-manganese high-aluminum steel is met, and the yield and the qualification rate of the high-manganese high-aluminum steel alloy are improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a three-step slag adjusting method suitable for refining high-manganese high-aluminum steel, which divides a high-manganese high-aluminum steel slag adjusting process into 3 steps and specifically comprises the following steps of:
the first step: in the LF refining stage, a high-alkalinity high-aluminum refining slag system is adopted, and Al in slag 2 O 3 The mass percentage is more than or equal to 25 percent, the alkalinity of a refining slag system is more than or equal to 5, the viscosity is 0.3 to 0.5 Pa.s, the slag formation is fast, and the inclusion adsorption capacity is strong; the concrete slag control operation is as follows: 1.0-3.0kg/t aluminum ingot, 3.3kg/t each of lime and low-silicon bauxite are added into molten steel during tapping; when ladle is refined in place by LF, adding 0.3-1.0kg/t of aluminum ingot into molten steel, adding 3.0-5.0kg/t of lime into ladle, 2.0-3.5kg/t of low-silicon bauxite, 0.6kg/t of fluorite and 1kg/t of calcium carbide; after LF refining is completed, 15kg of aluminum particles are added to the surface of refining slag;
and a second step of: in the vacuum refining stage, the viscosity is increased by increasing the alkalinity of the refining slag system, the thickness of a slag layer is increased, the alkalinity of the refining slag system is more than or equal to 7, the viscosity is more than or equal to 0.6 Pa.s, and the total amount of the refining slag is more than or equal to 15kg/t; the concrete slag control operation is as follows: adding lime 2.0-5.0kg/t, fluorite 0.3kg/t and calcium carbide 0.3kg/t into the ladle before vacuum pumping;
and a third step of: the aluminum alloy is added and soft-blown, the content of alumina in slag is improved, aluminum-oxygen reaction and aluminum-nitrogen reaction are inhibited, the alkalinity of a refining slag system is more than or equal to 7, the viscosity is 0.3-0.5 Pa.s, the refining slag system is maintained until casting is finished, the adsorption capacity of impurities of the refining slag system is improved again, and the cleanliness of high-manganese high-aluminum steel is ensured; the concrete slag control operation is as follows: adding 2.0-3.5kg/t of low-silicon bauxite into a ladle, starting aluminum alloying process operation, and simultaneously carrying out soft blowing process operation, wherein the soft blowing time is more than or equal to 15min.
Further, the low-silicon bauxite: al (Al) 2 O 3 ≥80％，SiO 2 ≤8％。
Further, the method is suitable for high-manganese high-aluminum steel with Mn more than or equal to 10.0% and Al more than or equal to 0.80%.
Further, the smelting production process of the high-manganese high-aluminum steel comprises the following steps: KR pretreatment desulfurization, top-bottom combined blowing converter, LF refining, vacuum air extraction refining, aluminum alloying and soft blowing and continuous casting.
Compared with the prior art, the invention has the beneficial technical effects that:
the three-step slag adjusting method and the smelting operation steps thereof are suitable for the special smelting process of the high-manganese high-aluminum steel, and the metallurgical characteristics of the refining slag are adjusted according to metallurgical requirements at different stages in the smelting process flow of the high-manganese high-aluminum steel, so that the refining slag can exert the maximum metallurgical effect, the cleanliness control requirement of the high-manganese high-aluminum steel is met, and the yield and the qualification rate of the high-manganese high-aluminum steel alloy are improved. In the LF refining stage, a large amount of manganese alloy is matched with the high-manganese high-aluminum steel, the refining slag system should rapidly form slag, and foreign impurities and deoxidized products brought by the alloy into molten steel are effectively adsorbed at the same time, so that the purity of the molten steel is ensured; in the vacuum refining stage, the vacuum is easy to cause the vaporization and overflow of manganese, the refining slag system has certain viscosity, the manganese loss is reduced, and the smooth removal of nitrogen in steel is ensured; in the aluminum alloy adding and soft blowing stage, the refining slag system can effectively prevent aluminum nitride and aluminum oxide inclusion from being generated, isolate air and ensure smooth casting of the high-manganese high-aluminum steel.
The three-step slag adjustment method and the smelting operation steps thereof are suitable for the special smelting process of the high-manganese high-aluminum steel, and the metallurgical characteristics of the refining slag are adjusted according to metallurgical requirements at different stages in the smelting process flow of the high-manganese high-aluminum steel, so that the refining slag can exert the maximum metallurgical effect, the cleanliness control requirement of the high-manganese high-aluminum steel is met, and the yield and the qualification rate of the high-manganese high-aluminum steel alloy are improved. The cost of the slag-making material of the refining slag system is increased by 10 yuan/t, and the rejection rate is reduced by 30 percent by improving the qualification rate of the high-manganese high-aluminum steel, so that the production cost is reduced by 600 yuan/t. The annual production of high manganese Gao Lvgang t can reduce the production cost by 118 ten thousand yuan/year.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a diagram showing the morphology of inclusions in high manganese and high aluminum produced by a conventional process;
FIG. 2 shows the morphology of inclusions in high manganese and high aluminum produced by the method of the patent.
Detailed Description
The three-step slag adjusting method is suitable for the refining of the high-manganese high-aluminum steel, comprises the smelting operation steps of the high-manganese high-aluminum steel with Mn more than or equal to 10.0 percent and Al more than or equal to 0.80 percent, and is suitable for the smelting production process of the high-manganese high-aluminum steel: KR pretreatment desulfurization-top-bottom combined blown converter-LF refining (ultra-high manganese alloy addition amount) -vacuum air extraction refining (easy gasification of manganese in steel) -aluminum alloying and soft blowing-continuous casting; the three-step adjustment process of the high-manganese high-aluminum steel slag specifically comprises the following steps:
the first step: in the LF refining stage, a high-alkalinity high-aluminum refining slag system is adopted, the mass percentage of Al2O3 in slag is more than or equal to 25%, the alkalinity of the refining slag system is more than or equal to 5, the viscosity is 0.3-0.5 Pa.s, the slag formation is rapid, and the inclusion adsorption capacity is strong. The concrete slag control operation is as follows: during tapping, 1.0-3.0kg/t of aluminum ingot, lime and low-silicon bauxite (wherein Al2O3 is more than or equal to 80% and SiO2 is less than or equal to 8%) are added into molten steel, and 3.3kg/t of aluminum ingot is respectively added. When ladle is in place during LF refining, 0.3-1.0kg/t of aluminum ingot is added into molten steel, 3.0-5.0kg/t of lime, 2.0-3.5kg/t of low-silicon bauxite, 0.6kg/t of fluorite and 1kg/t of calcium carbide are added into the ladle. After LF refining is completed, 15kg of aluminum particles are put into the surface of refining slag.
And a second step of: in the vacuum refining stage, the viscosity is increased by increasing the alkalinity of the refining slag system, the thickness of a slag layer is increased, the alkalinity of the refining slag system is more than or equal to 7, the viscosity is more than or equal to 0.6 Pa.s, and the total amount of the refining slag is more than or equal to 15kg/t; the concrete slag control operation is as follows: before vacuum pumping, adding lime 2.0-5.0kg/t, fluorite 0.3kg/t and calcium carbide 0.3kg/t into the ladle.
And a third step of: the aluminum alloy is added and soft blown, the content of alumina in slag is improved, the aluminum-oxygen reaction and the aluminum-nitrogen reaction are inhibited, the alkalinity of a refining slag system is more than or equal to 7, the viscosity is 0.3-0.5 Pa.s, the aluminum alloy is kept until casting is finished, the adsorption capacity of impurities of the refining slag system is improved again, and the cleanliness of the high-manganese high-aluminum steel is ensured. The concrete slag control operation is as follows: adding 2.0-3.5kg/t of low-silicon bauxite into a ladle, starting aluminum alloying process operation, and simultaneously carrying out soft blowing process operation, wherein the soft blowing time is more than or equal to 15min.
Comparative example
The original high-manganese high-aluminum steel slag adjustment process only comprises 1 step, and the specific operation is as follows: when the ladle is in place during LF refining, 3kg/t of aluminum-free deoxidizer is added into molten steel, and 4kg/t of lime, 1kg/t of fluorite and 1kg/t of calcium carbide are added into the ladle. After the LF positioning slag system is adjusted, the slag system is not adjusted at all; in the VD vacuum refining process, a manganese gasification effect occurs, so that the manganese content in the steel is greatly reduced, and the yield of the manganese alloy is only 80.3%; in the stage of adding and soft blowing of aluminum alloy, the aluminum content is increased sharply, refining slag is not adjusted, a large amount of aluminum nitride and alumina inclusions generated at the moment are not controlled effectively, and finally the inclusions aggregate and grow up, so that the performance of the high-manganese high-aluminum steel product is not good.
By adopting the slag system adjusting method provided by the patent, the inclusion in the high-manganese high-aluminum steel and the loss of manganese in the vacuum process can be effectively controlled, and the conditions of the addition amount and the yield of the manganese alloy when the original process and the process provided by the patent are adopted to produce the high-manganese high-aluminum steel are provided in the table 1.
TABLE 1 yield of manganese alloy produced by different technologies for high manganese high aluminum Steel
The appearance of the aluminum nitride inclusion which is commonly distributed in a layered manner in the high-manganese high-aluminum steel produced by adopting the original production process is shown in the following figure 1.
The aluminum nitride inclusions in the high-manganese high-aluminum steel produced by the method provided by the patent are generally in dispersion distribution, and the morphology of the aluminum nitride inclusions is shown in the following figure 2.
As can be seen from the comparison of FIG. 1 and FIG. 2, the size and distribution of the aluminum nitride inclusion in the high-manganese high-aluminum steel produced by the method are obviously improved, the aluminum nitride inclusion in the high-manganese high-aluminum steel produced by the method is obviously reduced, and the distribution of the aluminum nitride inclusion is obviously diffused.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (3)
1. The three-step slag adjusting method suitable for refining the high-manganese high-aluminum steel is characterized in that the slag adjusting process of the high-manganese high-aluminum steel is divided into 3 steps, and the method specifically comprises the following steps of:
the first step: in the LF refining stage, a high-alkalinity high-aluminum refining slag system is adopted, and Al in slag 2 O 3 The mass percentage is more than or equal to 25 percent, the alkalinity of a refining slag system is more than or equal to 5, the viscosity is 0.3 to 0.5 Pa.s, the slag formation is fast, and the inclusion adsorption capacity is strong; the concrete slag control operation is as follows: 1.0-3.0kg/t aluminum ingot, 3.3kg/t each of lime and low-silicon bauxite are added into molten steel during tapping; when ladle is refined in place by LF, adding 0.3-1.0kg/t of aluminum ingot into molten steel, adding 3.0-5.0kg/t of lime into ladle, 2.0-3.5kg/t of low-silicon bauxite, 0.6kg/t of fluorite and 1kg/t of calcium carbide; after LF refining is completed, 15kg of aluminum particles are added to the surface of refining slag;
and a second step of: in the vacuum refining stage, the viscosity is increased by increasing the alkalinity of the refining slag system, the thickness of a slag layer is increased, the alkalinity of the refining slag system is more than or equal to 7, the viscosity is more than or equal to 0.6 Pa.s, and the total amount of the refining slag is more than or equal to 15kg/t; the concrete slag control operation is as follows: adding lime 2.0-5.0kg/t, fluorite 0.3kg/t and calcium carbide 0.3kg/t into the ladle before vacuum pumping;
and a third step of: the aluminum alloy is added and soft-blown, the content of alumina in slag is improved, aluminum-oxygen reaction and aluminum-nitrogen reaction are inhibited, the alkalinity of a refining slag system is more than or equal to 7, the viscosity is 0.3-0.5 Pa.s, the refining slag system is maintained until casting is finished, the adsorption capacity of impurities of the refining slag system is improved again, and the cleanliness of high-manganese high-aluminum steel is ensured; the concrete slag control operation is as follows: adding 2.0-3.5kg/t of low-silicon bauxite into a ladle, starting aluminum alloying process operation, and simultaneously performing soft blowing process operation, wherein the soft blowing time is more than or equal to 15min;
is suitable for high-manganese high-aluminum steel with Mn more than or equal to 10.0 percent and Al more than or equal to 0.80 percent.
2. The refining three-step slag conditioning method for high manganese and high aluminum steel according to claim 1, wherein the low-silicon bauxite: al (Al) 2 O 3 ≥80%，SiO 2 ≤8%。
3. The three-step slag adjusting method for refining high-manganese high-aluminum steel according to claim 1, wherein the smelting production process of the high-manganese high-aluminum steel comprises the following steps: KR pretreatment desulfurization, top-bottom combined blowing converter, LF refining, vacuum air extraction refining, aluminum alloying and soft blowing and continuous casting.
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