CN110872672B - Method for smelting food-grade tinplate base material by using vanadium-titanium-containing molten iron - Google Patents
Method for smelting food-grade tinplate base material by using vanadium-titanium-containing molten iron Download PDFInfo
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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Abstract
The invention discloses a food-grade tinplate base material smelted by vanadium-titanium-containing molten iron and a method thereof. The tinplate base material comprises the following chemical components in percentage by mass: c: 0.010-0.015%, Si is less than or equal to 0.02%, Mn: 0.10-0.20%, P is less than or equal to 0.012%, S is less than or equal to 0.006%, V is less than or equal to 0.0005%, Ti: 0.020-0.030%, Als: 0.020-0.050%, less than or equal to 0.01% of Cu, less than or equal to 0.06% of Cr, less than or equal to 0.04% of Ni, less than or equal to 0.001% of Mo, less than or equal to 0.0003% of Pb, less than or equal to 0.001% of Sn, and the balance of Fe and inevitable impurity elements. The production method comprises the steps of vanadium-titanium-containing molten iron desulphurization, converter vanadium extraction, converter smelting, RH refining and slab continuous casting. The invention does not affect the extraction of the precious metals vanadium and titanium in the vanadium-titanium molten iron while producing the food-grade tinplate base material, and keeps the strengthening effect of the titanium element. By adopting methods such as molten steel top slag modification and the like, the cleanliness of molten steel is improved, and the production of food-grade tinplate base material by vanadium-containing molten iron becomes possible.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for smelting a food-grade tinplate base material by using vanadium-titanium-containing molten iron.
Background
Tinplate refers to a cold-rolled low-carbon steel sheet or strip plated on both sides with commercial pure tin, and due to its good sealing, preserving, light-shielding, firmness and special metal decorating charm, it has a wide range of coverage in the packaging container industry, and is a universal packaging variety internationally. The metal packaging plate is widely applied to the aspects of food packaging, medicine packaging, commodity packaging and the like, and is a metal packaging plate with the largest usage in the world.
At present, because the vanadium content in molten iron produced by iron and steel enterprises using vanadium-titanium magnetite as a main raw material is 0.100-0.500%, based on the characteristics of vanadium-titanium-containing molten iron smelting, the oxidability of the molten iron after vanadium extraction is strong, the fluctuation of the sulfur content in the molten iron is large and unstable, molten steel oxides are increased, the purity of the molten steel is poor, the problem of punching cracking of food-grade tinplate is caused, and the use of the food packaging tightness is finally influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for smelting a food-grade tinplate base material by using vanadium-titanium-containing molten iron.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for smelting food-grade tinplate base stock by using vanadium-titanium-containing molten iron comprises the working procedures of vanadium-titanium-containing molten iron desulphurization, converter vanadium extraction, converter smelting, RH refining and slab continuous casting, and comprises the following specific process steps:
(1) a vanadium-titanium-containing molten iron desulphurization process: by adopting a composite injection method, 0.20-0.60 kg of magnesium particles per ton of steel is added, 0.60-1.80 kg of lime per ton of steel is injected, the injection time is 10-18 min, and after desulfurization is finished, the vanadium-titanium-containing molten steel S is less than or equal to 0.0030%;
(2) a converter vanadium extraction procedure: adding desulfurized vanadium-titanium-containing molten iron into a vanadium extraction converter, keeping the temperature of the semi-steel at 1320-1350 ℃, and adding 6.0-7.0 kg of ferrosilicon per t of steel into the semi-steel ladle before tapping of the semi-steel for heat compensation to obtain vanadium-containing semi-steel with V being less than or equal to 0.020%;
(3) a converter smelting process: adding vanadium-containing semisteel into a steelmaking converter for blowing, wherein the blowing process is carried outThe whole process of the converter is bottom blown with argon, and the bottom blowing intensity is 0.03-0.05 Nm3T is/min; the converter end point oxygen content is 600-800 ppm, the carbon content is 0.03-0.04%, 1.5-2.5 kg/t of ferromanganese is added in the tapping process, 1.5-2.5 kg/t of steel of small-particle lime, 1.5-2.5 kg/t of steel of composite refining slag, 1.5-2.5 kg/t of steel of top slag modifier and 1-2 kg/t of steel are added at the time of tapping 1/2, the small-particle lime is added before tapping, no deoxidizing agent is added, slag blocking tapping is carried out on the converter tapping, a slag blocking cone and sliding plate slag blocking are matched for use, the slag blocking cone is added when molten steel is injected into a ladle along 400 scales 600mm away from the ladle, the sliding plate is closed when the slag blocking cone succeeds in slag blocking, the sliding plate is prevented from flowing out and nitrogen is increased, the ladle car is driven to an argon station to carry out oxygen fixation and temperature measurement after the slag blocking cone is added, the oxygen content is 500-700 ppm, the temperature
(4) RH refining process: after the oxygen determination and temperature measurement of the molten steel are completed, hoisting the ladle to an RH furnace for refining treatment, feeding the ladle into the RH furnace for post-treatment at the temperature of 1620-1640 ℃, and adjusting alloy components to be qualified by adopting a natural decarburization method, wherein the vacuum degree is less than or equal to 67Pa, the pure degassing time is 8-10 min, and the calming time is 15-20 min; the slag system component of the top slag after the RH vacuum treatment is CaO: 45-55%, Al2O 3: 27-33%, SiO 2: less than or equal to 5.0 percent and FeO + MnO less than 2 percent;
(5) and a slab continuous casting process: and a slab continuous casting process: and pouring the molten steel with qualified components after the RH furnace refining treatment, wherein the pouring temperature is 1548-1568 ℃, and the casting blank drawing speed is 1.05-1.25 m/min to obtain a continuous casting blank.
The chemical components and the mass percentage of the vanadium-titanium-containing molten iron in the step (1) are as follows: c: 3.9-4.4%, Si: 0.09-0.60%, Mn: 0.15-0.50%, P: 0.130-0.170%, S: 0.050-0.080%, V: 0.22-0.26%, Ti: 0.065-0.200%, Als: 0.0010-0.0020%, Cu: not more than 0.0060%, Cr: less than or equal to 0.09 percent, less than or equal to 0.02 percent of Ni, less than or equal to 0.009 percent of Mo, less than or equal to 0.004 percent of Pb, less than or equal to 0.001 percent of Sn and the balance of Fe and inevitable impurities.
The molten steel smelted in the converter in the step (3) comprises the following chemical components in percentage by mass: c: 0.03-0.04%, Si is less than or equal to 0.01%, Mn: 0.10-0.20%, P is less than or equal to 0.012%, S is less than or equal to 0.006%, V is less than or equal to 0.0005%, Ti is less than or equal to 0.0025%, Als: 0.0005-0.0010%, less than or equal to 0.01% of Cu, less than or equal to 0.03% of Cr, less than or equal to 0.02% of Ni, less than or equal to 0.001% of Mo, less than or equal to 0.0003% of Pb, less than or equal to 0.001% of Sn, and the balance of Fe and inevitable impurities.
The composite refining slag in the step (3) of the invention is CaO: 45-55% of Al2O3 ：35～45%、SiO2：≤5.0%、H2O: less than 0.5 percent and the balance of impurities.
The top slag modifier in the step (3) comprises 45-50% of pure Al, 18-30% of CaO and Al2O3 ：≤15%、SiO2：≤8.0%、H2O: less than 0.5 percent and the balance of impurities.
The chemical components and the mass percentage of the chemical components of the composition of the RH refined synthetic steel in the step (4) are as follows: c: 0.010-0.015%, Si is less than or equal to 0.02%, Mn: 0.10-0.20%, P is less than or equal to 0.012%, S is less than or equal to 0.006%, V is less than or equal to 0.0005%, Ti: 0.020-0.030%, Als: 0.020-0.050%, less than or equal to 0.01% of Cu, less than or equal to 0.06% of Cr, less than or equal to 0.04% of Ni, less than or equal to 0.001% of Mo, less than or equal to 0.0003% of Pb, less than or equal to 0.001% of Sn, and the balance of Fe and inevitable impurity elements.
The top slag after finishing the RH furnace refining in the step (4) of the invention comprises the following components: CaO: 45-55% of Al2O3：27～33%、SiO2≤5.0%、MgO：3～8%、FeO+MnO≤2%。
According to the method, A, B, C, D types of coarse and fine inclusions in the low-power casting blank structure obtained by slab continuous casting in the step (5) are less than or equal to 0.5 level.
The food-grade tinplate base material produced by the method comprises the following chemical components in percentage by mass: c: 0.010-0.015%, Si is less than or equal to 0.02%, Mn: 0.10-0.20%, P is less than or equal to 0.012%, S is less than or equal to 0.006%, V is less than or equal to 0.0005%, Ti: 0.020-0.030%, Als: 0.020-0.050%, less than or equal to 0.01% of Cu, less than or equal to 0.06% of Cr, less than or equal to 0.04% of Ni, less than or equal to 0.001% of Mo, less than or equal to 0.0003% of Pb, less than or equal to 0.001% of Sn, and the balance of Fe and inevitable impurity elements.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the invention has no influence on the extraction of the precious metals vanadium and titanium in the vanadium-titanium molten iron while producing the food-grade tinplate base material, saves mineral resources and reserves the strengthening effect of the titanium element. 2. The invention promotes the molten steel inclusion to be adsorbed by adopting the methods of molten steel top slag modification, RH vacuum treatment, continuous casting stable drawing speed and the like, improves the cleanliness of the molten steel, solves the problems of strong oxidability of the molten steel, more inclusions, larger fluctuation of the sulfur content in the process and the like when the vanadium-titanium-containing molten iron is used for smelting food-grade tinplate base materials, enables the production of the food-grade tinplate base materials by the vanadium-containing molten iron to be possible, simultaneously greatly reduces the production cost, avoids the loss caused by the overproof residual elements, and realizes the cost reduction and the efficiency improvement of enterprises.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The method for smelting the food-grade tinplate base material by using the vanadium-titanium-containing molten iron comprises the working procedures of vanadium-titanium-containing molten iron desulphurization, converter vanadium extraction, converter smelting, RH refining and slab continuous casting, and comprises the following specific process steps:
(1) a vanadium-titanium-containing molten iron desulphurization process: by adopting a composite injection method, 0.20 kg of magnesium particles per t of steel is added, 0.60 kg of lime per t of steel is injected, the injection time is 10min, and after the desulfurization is finished, the molten steel S containing vanadium and titanium is prepared by the following steps: 0.0020 percent; the chemical composition and the mass percentage content of the vanadium-titanium-containing water are shown in the table 1;
(2) a converter vanadium extraction procedure: and adding the desulfurized vanadium-titanium-containing molten iron into a vanadium extraction converter, wherein the temperature of the semi-steel is 1335 ℃, and 6.0 kg of silicon iron per ton of steel is added into the semi-steel ladle before tapping of the semi-steel for heat compensation to obtain V: 0.018% vanadium-containing semisteel;
(3) a converter smelting process: adding vanadium-containing semisteel into a steelmaking converter for blowing, wherein the whole process of the converter is subjected to bottom blowing argon in the blowing process, and the bottom blowing strength is 0.03Nm3T is/min; the converter end point oxygen content is 700ppm, the carbon content is 0.03%, 1.5 kg of ferromanganese per t of steel is added in the tapping process, 1.5 kg of small lime, 1.5 kg of composite refined slag and 1 kg of top slag modifier are added when the tapping is carried out at 1/2, the small lime, the steel, the composite refined slag, the steel and the top slag modifier are added completely before the tapping is finished, no deoxidizing agent is added, the converter carries out slag blocking and tapping, the slag blocking cone is matched with a sliding plate for tapping, the slag blocking cone is added when the molten steel is injected into the steel ladle along a distance of 400mm from the steel ladle, the sliding plate is closed when the slag blocking of the slag blocking cone succeeds, the diffusion flow and nitrogen increase are prevented, and the ladle car is driven to an argon station for oxygen-fixing and temperature measurement after the molten steel is added; after smelting in a converterThe chemical components and the mass percentage of the molten steel are shown in the table 2;
(4) RH refining process: after the oxygen determination and temperature measurement of the molten steel are completed, hoisting the steel ladle to an RH furnace for refining, feeding the steel ladle into the RH furnace for post-treatment at the temperature of 1620 ℃, adjusting alloy components to be qualified by adopting a natural decarburization method with the vacuum degree of 67Pa, the pure degassing time of 8min and the calming time of 15min, and after the RH furnace is refined, wherein the top slag component comprises: CaO: 45.8% of Al2O3：29.5%、SiO2: 4.1%, MgO: 5.4%, FeO + MnO: 1.2 percent; chemical components and mass percentage contents of the finished product of the RH refining steel are shown in Table 3;
(5) and a slab continuous casting process: and pouring the molten steel with qualified components after the RH furnace refining treatment, wherein the pouring temperature is 1548 ℃, and the casting blank drawing speed is 1.05m/min to obtain a continuous casting blank.
A, B, C, D types of coarse and fine inclusions in a low-power casting blank structure obtained by the method for smelting the food-grade tinplate base material by using the molten iron containing vanadium and titanium in the embodiment are all 0 level; the chemical composition and the mass percentage of the food-grade tinplate base material are shown in the table 3.
Example 2
The method for smelting the food-grade tinplate base material by using the vanadium-titanium-containing molten iron comprises the working procedures of vanadium-titanium-containing molten iron desulphurization, converter vanadium extraction, converter smelting, RH refining and slab continuous casting, and comprises the following specific process steps:
(1) a vanadium-titanium-containing molten iron desulphurization process: by adopting a composite injection method, 0.60 kg of magnesium particles per t of steel is added, 1.80 kg of lime per t of steel is injected, the injection time is 18min, and after the desulfurization is finished, the molten steel S containing vanadium and titanium is prepared by the following steps: 0.0001 percent; the chemical composition and the mass percentage content of the vanadium-titanium-containing water are shown in the table 1;
(2) a converter vanadium extraction procedure: and adding the desulfurized vanadium-titanium-containing molten iron into a vanadium extraction converter, wherein the temperature of the semi-steel is 1350 ℃, and adding 7.0 kg of silicon iron per ton of steel into the semi-steel ladle before tapping of the semi-steel for heat compensation to obtain V: 0.014% vanadium-containing semisteel;
(3) a converter smelting process: adding vanadium-containing semisteel into a steelmaking converter for blowing, wherein the whole process of the converter is subjected to bottom blowing argon in the blowing process, and the bottom blowing strength is 0.05Nm3T is/min; the converter end point oxygen content is 650ppm, the carbon content is 0.04%,2.5 kg of ferromanganese is added in the tapping process, 2.5 kg of small-sized lime, 2.5 kg of steel, 2.5 kg of composite refining slag and 2 kg of top slag modifier are added when tapping 1/2, the steel is completely added before tapping, no deoxidizing agent is added, slag stopping and tapping are carried out during tapping of the converter, slag stopping cones and sliding plate slag stopping are matched for use, the slag stopping cones are added when molten steel is injected into the steel ladle along a distance of 400mm from the steel ladle, the sliding plates are closed when the slag stopping cones are successful in slag stopping, the diffused flow and nitrogen increase are prevented, and the steel ladle vehicle is driven to an argon station for oxygen-fixing and temperature measurement after the steel is added; the chemical components and the mass percentage of the molten steel after smelting in the converter are shown in the table 2;
(4) RH refining process: after the oxygen determination and temperature measurement of the molten steel are completed, hoisting the ladle to an RH furnace for refining, feeding the ladle into the RH furnace for post-treatment at the temperature of 1640 ℃, adjusting alloy components to be qualified by adopting a natural decarburization method with the vacuum degree of 58Pa, the pure degassing time of 10min and the calming time of 18min, and after the RH furnace is refined, wherein the top slag component comprises: CaO: 55% of Al2O3：33%、SiO2: 5.0%, MgO: 8%, FeO + MnO: 2 percent; chemical components and mass percentage contents of the finished product of the RH refining steel are shown in Table 3;
(5) and a slab continuous casting process: and pouring the molten steel with qualified components after the RH furnace refining treatment at 1568 ℃ at a casting blank casting speed of 1.25m/min to obtain a continuous casting blank.
A, B, C, D types of coarse and fine inclusions in a low-power casting blank structure obtained by the method for smelting the food-grade tinplate base material by using the molten iron containing vanadium and titanium in the embodiment are all 0 level; the chemical composition and the mass percentage of the food-grade tinplate base material are shown in the table 3.
Example 3
The method for smelting the food-grade tinplate base material by using the vanadium-titanium-containing molten iron comprises the working procedures of vanadium-titanium-containing molten iron desulphurization, converter vanadium extraction, converter smelting, RH refining and slab continuous casting, and comprises the following specific process steps:
(1) a vanadium-titanium-containing molten iron desulphurization process: by adopting a composite injection method, 0.40 kg of magnesium particles per t of steel is added, 1.0 kg of lime per t of steel is injected, the injection time is 15min, and after the desulfurization is finished, the molten steel S containing vanadium and titanium is prepared by the following steps: 0.0021%; the chemical composition and the mass percentage content of the vanadium-titanium-containing water are shown in the table 1;
(2) a converter vanadium extraction procedure: and adding the desulfurized vanadium-titanium-containing molten iron into a vanadium extraction converter, controlling the temperature of the semi-steel to be 1340 ℃, and adding 6.3 kg of silicon iron per ton of steel into the semi-steel ladle before tapping of the semi-steel for heat compensation to obtain V: 0.017% of vanadium-containing semisteel;
(3) a converter smelting process: adding vanadium-containing semisteel into a steelmaking converter for blowing, wherein the whole process of the converter is subjected to bottom blowing argon in the blowing process, and the bottom blowing strength is 0.04Nm3T is/min; the converter end point oxygen content is 750ppm, the carbon content is 0.035%, 2.0 kg of ferromanganese is added per t of steel in the tapping process, 2.0 kg of small lime, 2.0 kg of composite refined slag and 1.5 kg of top slag modifier are added when 1/2 of steel is tapped, the steel is completely added before tapping is finished, no deoxidizer is added, slag blocking tapping is carried out during converter tapping, the slag blocking cone is matched with a sliding plate for slag blocking, the slag blocking cone is added when molten steel is injected into a steel ladle along a distance of 400mm from the steel ladle, when the slag blocking cone successfully blocks slag, the sliding plate is closed, the dispersed flow and nitrogen increase are prevented, and after the adding is finished, the steel ladle is turned to an argon station for oxygen fixation and temperature measurement; the chemical components and the mass percentage of the molten steel after smelting in the converter are shown in the table 2;
(4) RH refining process: after the oxygen determination and temperature measurement of the molten steel are completed, hoisting the ladle to an RH furnace for refining, feeding the ladle into the RH furnace for post-treatment at a temperature of 1630 ℃, adjusting alloy components to be qualified by adopting a natural decarburization method with a vacuum degree of 60Pa, a pure degassing time of 9min and a calming time of 17min, and after the RH furnace is refined, wherein the top slag component comprises: CaO: 48.2% of Al2O3：27.5%、SiO2: 4.6%, MgO: 3.9%, FeO + MnO: 1.5 percent; chemical components and mass percentage contents of the finished product of the RH refining steel are shown in Table 3;
(5) and a slab continuous casting process: and pouring molten steel with qualified components after the RH furnace refining treatment at 1558 ℃ at the casting blank drawing speed of 1.21m/min to obtain a continuous casting blank.
In the low-power casting blank structure obtained by the method for smelting the food-grade tinplate base material by using the molten iron containing vanadium and titanium, A, B, C, D types of coarse and fine inclusions are 0.1 grade; the chemical composition and the mass percentage of the food-grade tinplate base material are shown in the table 3.
Example 4
The method for smelting the food-grade tinplate base material by using the vanadium-titanium-containing molten iron comprises the working procedures of vanadium-titanium-containing molten iron desulphurization, converter vanadium extraction, converter smelting, RH refining and slab continuous casting, and comprises the following specific process steps:
(1) a vanadium-titanium-containing molten iron desulphurization process: by adopting a composite injection method, 0.5 kg of magnesium particles per t of steel is added, 1.1 kg of lime per t of steel is injected, the injection time is 17min, and after the desulfurization is finished, the molten steel S containing vanadium and titanium is prepared by the following steps: 0.0012%; the chemical composition and the mass percentage content of the vanadium-titanium-containing water are shown in the table 1;
(2) a converter vanadium extraction procedure: and adding the desulfurized vanadium-titanium-containing molten iron into a vanadium extraction converter, controlling the temperature of the semi-steel to be 1330 ℃, and adding 6.6 kg of silicon iron per ton of steel into the semi-steel ladle before tapping of the semi-steel for heat compensation to obtain V: 0.015 percent of vanadium-containing semisteel;
(3) a converter smelting process: adding vanadium-containing semisteel into a steelmaking converter for blowing, wherein the whole process of the converter is subjected to bottom blowing argon in the blowing process, and the bottom blowing strength is 0.032Nm3T is/min; the converter end point oxygen content is 620ppm, the carbon content is 0.035%, 1.8 kg of ferromanganese is added per t of steel in the tapping process, 1.6 kg of small lime, 1.9 kg of composite refined slag and 1.7 kg of top slag modifier are added when 1/2 steel is tapped, the steel is completely added before tapping, no deoxidizer is added, slag blocking tapping is carried out during converter tapping, the slag blocking cone is matched with a sliding plate for slag blocking, the slag blocking cone is added when molten steel is injected into a steel ladle along a distance of 400mm, when the slag blocking cone successfully blocks slag, the sliding plate is closed, the dispersed flow and nitrogen are prevented from being increased, and after the completion of adding, the steel ladle is turned to an argon station for oxygen fixation and temperature measurement; the chemical components and the mass percentage of the molten steel after smelting in the converter are shown in the table 2;
(4) RH refining process: after the oxygen determination and temperature measurement of the molten steel are completed, hoisting the steel ladle to an RH furnace for refining, feeding the steel ladle into the RH furnace for post-treatment at 1625 ℃, adopting a natural decarburization method, wherein the vacuum degree is 62Pa, the pure degassing time is 11min, the calming time is 16min, adjusting the alloy components to be qualified, and the top slag component after the RH furnace refining is finished is as follows: CaO: 52.1% of Al2O3：30.4%、SiO2: 4.8%, MgO: 6.2%, FeO + MnO: 1.4 percent; chemical components and mass percentage contents of the finished product of the RH refining steel are shown in Table 3;
(5) and a slab continuous casting process: and pouring molten steel with qualified components after the RH furnace refining treatment at 1552 ℃ at the casting blank drawing speed of 1.20m/min to obtain a continuous casting blank.
In the low-power casting blank structure obtained by the method for smelting the food-grade tinplate base material by using the molten iron containing vanadium and titanium, A, B, C, D types of coarse and fine inclusions are 0.2 grade; the chemical composition and the mass percentage of the food-grade tinplate base material are shown in the table 3.
Example 5
The method for smelting the food-grade tinplate base material by using the vanadium-titanium-containing molten iron comprises the working procedures of vanadium-titanium-containing molten iron desulphurization, converter vanadium extraction, converter smelting, RH refining and slab continuous casting, and comprises the following specific process steps:
(1) a vanadium-titanium-containing molten iron desulphurization process: by adopting a composite injection method, 0.35 kg of magnesium particles per t of steel and 0.8 kg of lime per t of steel are added, the injection time is 12min, and after the desulfurization is finished, the molten steel S containing vanadium and titanium is prepared by the following steps: 0.0015 percent; the chemical composition and the mass percentage content of the vanadium-titanium-containing water are shown in the table 1;
(2) a converter vanadium extraction procedure: and (3) adding the desulfurized vanadium-titanium-containing molten iron into a vanadium extraction converter, wherein the temperature of the semi-steel is 1325 ℃, and 6.8 kg of silicon iron per t of steel is added into the semi-steel ladle before tapping of the semi-steel for heat compensation to obtain V: 0.010% of vanadium-containing semisteel;
(3) a converter smelting process: adding vanadium-containing semisteel into a steelmaking converter for blowing, wherein the whole process of the converter is subjected to bottom blowing argon in the blowing process, and the bottom blowing strength is 0.043Nm3T is/min; the converter end point oxygen content is 720ppm, the carbon content is 0.038%, 1.6 kg of ferromanganese is added per t of steel in the tapping process, 2.2 kg of small lime, 2.3 kg of composite refining slag and 1.2 kg of top slag modifier are added at the time of tapping 1/2, the steel is completely added before tapping, no deoxidizer is added, slag blocking tapping is carried out during converter tapping, the slag blocking cones are matched with sliding plate slag blocking, the slag blocking cones are added when molten steel is injected into the steel ladle along a distance of 400mm from the steel ladle, when the slag blocking cones successfully block slag, the sliding plates are closed, the dispersed flow and nitrogen increase are prevented, and after the addition is finished, the ladle car is driven to an argon station for oxygen fixation and temperature measurement; the chemical components and the mass percentage of the molten steel after smelting in the converter are shown in the table 2;
(4) RH refining process: after the oxygen determination and temperature measurement of the molten steel are finished, hoisting the ladle to an RH furnace for refiningTreating, wherein the treatment temperature is 1635 ℃ after the RH furnace is fed, a natural decarburization method is adopted, the vacuum degree is 55Pa, the pure degassing time is 9.5min, the calming time is 16.5min, the alloy components are adjusted to be qualified, and the top slag component after the RH furnace refining is finished is as follows: CaO: 50.1% of Al2O3：28.3%、SiO2: 3.7%, MgO: 7.5%, FeO + MnO: 1.6 percent; chemical components and mass percentage contents of the finished product of the RH refining steel are shown in Table 3;
(5) and a slab continuous casting process: and pouring molten steel with qualified components after the RH furnace refining treatment at 1551 ℃ at the casting blank drawing speed of 1.18m/min to obtain a continuous casting blank.
A, B, C, D types of coarse and fine inclusions in a low-power casting blank structure obtained by the method for smelting the food-grade tinplate base material by using the molten iron containing vanadium and titanium in the embodiment are all 0.3 grade; the chemical composition and the mass percentage of the food-grade tinplate base material are shown in the table 3.
Example 6
The method for smelting the food-grade tinplate base material by using the vanadium-titanium-containing molten iron comprises the working procedures of vanadium-titanium-containing molten iron desulphurization, converter vanadium extraction, converter smelting, RH refining and slab continuous casting, and comprises the following specific process steps:
(1) a vanadium-titanium-containing molten iron desulphurization process: by adopting a composite injection method, 0.35 kg of magnesium particles per t of steel is added, 1.6 kg of lime per t of steel is injected, the injection time is 16min, and after the desulfurization is finished, the molten steel S containing vanadium and titanium is prepared by the following steps: 0.0006 percent; the chemical composition and the mass percentage content of the vanadium-titanium-containing water are shown in the table 1;
(2) a converter vanadium extraction procedure: and adding the desulfurized vanadium-titanium-containing molten iron into a vanadium extraction converter, wherein the temperature of the semi-steel is 1345 ℃, and 6.6 kg of silicon iron per t of steel is added into the semi-steel ladle before tapping of the semi-steel for heat compensation to obtain V: 0.012% of vanadium-containing semisteel;
(3) a converter smelting process: adding vanadium-containing semisteel into a steelmaking converter for blowing, wherein the whole process of the converter is subjected to bottom blowing argon in the blowing process, and the bottom blowing strength is 0.032Nm3T is/min; the converter end point oxygen content is 670ppm, the carbon content is 0.036%, 2.2 kg of ferromanganese is added per t of steel in the tapping process, 1.8 kg of small lime, 1.6 kg of composite refined slag and 1.4 kg of top slag modifier are added per t of steel when the steel is tapped 1/2, and the tapping is performedAdding a deoxidizing agent before finishing the beam, carrying out slag-stopping tapping during converter tapping, using a slag-stopping cone and a sliding plate in a matched manner, adding the slag-stopping cone when molten steel is injected into a steel ladle and is 400mm away from the edge of the steel ladle, closing the sliding plate when the slag-stopping cone stops slag successfully, preventing the scattered flow and increasing nitrogen, and after the molten steel is added, turning on the steel ladle to an argon station for oxygen determination and temperature measurement; the chemical components and the mass percentage of the molten steel after smelting in the converter are shown in the table 2;
(4) RH refining process: after the oxygen determination and temperature measurement of the molten steel are completed, hoisting the steel ladle to an RH furnace for refining, feeding the steel ladle into the RH furnace for post-treatment at 1624 ℃, adopting a natural decarburization method, wherein the vacuum degree is 64Pa, the pure degassing time is 10.5min, the calming time is 15.5min, adjusting the alloy components to be qualified, and the top slag component after the RH furnace refining is finished is as follows: CaO: 49.3% of Al2O3：31.5%、SiO2: 3.2%, MgO: 4.6%, FeO + MnO: 1.3 percent; chemical components and mass percentage contents of the finished product of the RH refining steel are shown in Table 3;
(5) and a slab continuous casting process: and pouring molten steel with qualified components after the RH furnace refining treatment at 1551 ℃ at the casting blank drawing speed of 1.18m/min to obtain a continuous casting blank.
In the low-power casting blank structure obtained by the method for smelting the food-grade tinplate base material by using the molten iron containing vanadium and titanium, A, B, C, D types of coarse and fine inclusions are 0.5 grade; the chemical composition and the mass percentage of the food-grade tinplate base material are shown in the table 3.
Example 7
The method for smelting the food-grade tinplate base material by using the vanadium-titanium-containing molten iron comprises the working procedures of vanadium-titanium-containing molten iron desulphurization, converter vanadium extraction, converter smelting, RH refining and slab continuous casting, and comprises the following specific process steps:
(1) a vanadium-titanium-containing molten iron desulphurization process: by adopting a composite injection method, 0.44 kg of magnesium particles per t of steel is added, 1.15 kg of lime per t of steel is injected, the injection time is 13min, and after the desulfurization is finished, the molten steel S containing vanadium and titanium is prepared by the following steps: 0.0025 percent; the chemical composition and the mass percentage content of the vanadium-titanium-containing water are shown in the table 1;
(2) a converter vanadium extraction procedure: and adding the desulfurized vanadium-titanium-containing molten iron into a vanadium extraction converter, wherein the temperature of the semi-steel is 1332 ℃, and 6.2 kg of silicon iron per t of steel is added into the semi-steel ladle before tapping of the semi-steel for heat compensation to obtain V: 0.009% of vanadium-containing semisteel;
(3) a converter smelting process: adding vanadium-containing semisteel into a steelmaking converter for blowing, wherein the whole process of the converter is subjected to bottom blowing argon in the blowing process, and the bottom blowing strength is 0.046Nm3T is/min; the converter end point oxygen content is 600ppm, the carbon content is 0.039%, 1.7 kg of ferromanganese is added per t of steel in the tapping process, 2.3 kg of small lime, 1.8 kg of composite refining slag, 1.9 kg of top slag modifier per t of steel are added when tapping 1/2 is carried out, the steel is completely added before tapping is finished, no deoxidizer is added, slag blocking tapping is carried out during converter tapping, the slag blocking cone is matched with sliding plate slag blocking, the slag blocking cone is added when molten steel is injected into a steel ladle along a distance of 400mm from the steel ladle, when the slag blocking of the slag blocking cone succeeds, the sliding plate is closed, the dispersed flow and nitrogen increase are prevented, and after the adding is finished, the ladle car is driven to an argon station for oxygen fixation and temperature measurement; the chemical components and the mass percentage of the molten steel after smelting in the converter are shown in the table 2;
(4) RH refining process: after the oxygen determination and temperature measurement of the molten steel are completed, hoisting the ladle to an RH furnace for refining, feeding the ladle into the RH furnace for post-treatment at a temperature of 1638 ℃, adopting a natural decarburization method, wherein the vacuum degree is 50Pa, the pure degassing time is 12min, the calming time is 19min, adjusting the alloy components to be qualified, and the top slag component after the RH furnace refining is finished is as follows: CaO: 47.6% of Al2O3：33%、SiO2: 2.8%, MgO: 8%, FeO + MnO: 1.0 percent; chemical components and mass percentage contents of the finished product of the RH refining steel are shown in Table 3;
(5) and a slab continuous casting process: and pouring molten steel with qualified components after the RH furnace refining treatment at 1550 ℃ and casting blank drawing speed of 1.18m/min to obtain a continuous casting blank.
A, B, C, D types of coarse and fine inclusions in a low-power casting blank structure obtained by the method for smelting the food-grade tinplate base material by using the molten iron containing vanadium and titanium in the embodiment are all 0 level; the chemical composition and the mass percentage of the food-grade tinplate base material are shown in the table 3.
Example 8
The method for smelting the food-grade tinplate base material by using the vanadium-titanium-containing molten iron comprises the working procedures of vanadium-titanium-containing molten iron desulphurization, converter vanadium extraction, converter smelting, RH refining and slab continuous casting, and comprises the following specific process steps:
(1) a vanadium-titanium-containing molten iron desulphurization process: by adopting a composite injection method, 0.32 kg of magnesium particles per t of steel is added, 1.2 kg of lime per t of steel is injected, the injection time is 11min, and after the desulfurization is finished, the molten steel S containing vanadium and titanium is prepared by the following steps: 0.0030%; the chemical composition and the mass percentage content of the vanadium-titanium-containing water are shown in the table 1;
(2) a converter vanadium extraction procedure: and adding the desulfurized vanadium-titanium-containing molten iron into a vanadium extraction converter, wherein the temperature of the semi-steel is 1320 ℃, and 6.4 kg of silicon iron per ton of steel is added into the semi-steel ladle before tapping of the semi-steel for heat compensation to obtain V: 0.020% of vanadium-containing semisteel;
(3) a converter smelting process: the vanadium-containing semisteel is added into a steelmaking converter for blowing, argon is blown at the bottom of the converter in the whole process of the blowing process, and the bottom blowing strength is 0.035Nm3T is/min; the converter end point oxygen content is 800ppm, the carbon content is 0.031%, 2.3 kg of ferromanganese is added per t of steel in the tapping process, 1.9 kg of small lime, 2.1 kg of composite refining slag, and 1.3 kg of top slag modifier are added at the beginning of tapping 1/2, the steel is completely added before tapping, no deoxidizer is added, slag blocking tapping is carried out during converter tapping, the slag blocking cone is matched with sliding plate slag blocking, the slag blocking cone is added when molten steel is injected into the steel ladle along a distance of 400mm from the steel ladle, when the slag blocking cone successfully blocks slag, the sliding plate is closed, the dispersed flow and nitrogen increase are prevented, and after the adding, the ladle car is driven to an argon station for oxygen fixation and temperature measurement; the chemical components and the mass percentage of the molten steel after smelting in the converter are shown in the table 2;
(4) RH refining process: after the oxygen determination and temperature measurement of the molten steel are completed, hoisting the steel ladle to an RH furnace for refining, feeding the steel ladle into the RH furnace for post-treatment at 1627 ℃, adopting a natural decarburization method, wherein the vacuum degree is 61Pa, the pure degassing time is 8.5min, the calming time is 20min, adjusting the alloy components to be qualified, and the top slag component after the RH furnace refining is finished is as follows: CaO: 45% of Al2O3：27%、SiO2: 5%, MgO: 3%, FeO + MnO: 0.8 percent; chemical components and mass percentage contents of the finished product of the RH refining steel are shown in Table 3;
(5) and a slab continuous casting process: and pouring molten steel with qualified components after the RH furnace refining treatment at 1553 ℃ at the casting blank drawing speed of 1.19m/min to obtain a continuous casting blank.
A, B, C, D types of coarse and fine inclusions in a low-power casting blank structure obtained by the method for smelting the food-grade tinplate base material by using the molten iron containing vanadium and titanium in the embodiment are all 0 level; the chemical composition and the mass percentage of the food-grade tinplate base material are shown in the table 3.
Table 1 examples 1-8 chemical composition of vanadium and titanium bearing iron-containing waters and their mass% content (%)
Table 2 examples 1-8 molten steel after converter smelting, chemical composition and mass% thereof
Table 3 examples 1-8 chemical composition and% by mass of food grade tinplate base
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (8)
1. A production method for smelting food-grade tinplate base material by using vanadium-titanium-containing molten iron is characterized in that the tinplate base material comprises the following chemical components in percentage by mass: c: 0.010-0.015%, Si is less than or equal to 0.02%, Mn: 0.10-0.20%, P is less than or equal to 0.012%, S is less than or equal to 0.006%, V is less than or equal to 0.0005%, Ti: 0.020-0.030%, Als: 0.020-0.050%, not more than 0.01% of Cu, not more than 0.06% of Cr, not more than 0.04% of Ni, not more than 0.001% of Mo, not more than 0.0003% of Pb, not more than 0.001% of Sn, and the balance of Fe and inevitable impurity elements; the method comprises the working procedures of vanadium-titanium-containing molten iron desulfurization, converter vanadium extraction, converter smelting, RH refining and slab continuous casting, and the specific process steps are as follows:
(1) a vanadium-titanium-containing molten iron desulphurization process: by adopting a composite injection method, 0.20-0.60 kg of magnesium particles per ton of steel is added, 0.60-1.80 kg of lime per ton of steel is injected, the injection time is 10-18 min, and after desulfurization is finished, the vanadium-titanium-containing molten steel S is less than or equal to 0.0030%;
(2) a converter vanadium extraction procedure: adding desulfurized vanadium-titanium-containing molten iron into a vanadium extraction converter, keeping the temperature of the semi-steel at 1320-1350 ℃, and adding 6.0-7.0 kg of ferrosilicon per t of steel into the semi-steel ladle before tapping of the semi-steel for heat compensation to obtain vanadium-containing semi-steel with V being less than or equal to 0.020%;
(3) a converter smelting process: adding vanadium-containing semisteel into a steelmaking converter for blowing, wherein the whole process of the converter is subjected to bottom blowing argon in the blowing process, and the bottom blowing strength is 0.03-0.05 Nm3T is/min; the converter end point oxygen content is 600-800 ppm, the carbon content is 0.03-0.04%, 1.5-2.5 kg/t of ferromanganese is added in the tapping process, 1.5-2.5 kg/t of steel of small-grain lime, 1.5-2.5 kg/t of steel of composite refining slag and 1-2 kg/t of steel of a top slag modifier are added when tapping 1/2 is started, a deoxidizer is not added before tapping is finished, slag blocking tapping is carried out on the converter tapping, a slag blocking cone and a sliding plate are matched for use, when molten steel is injected into a ladle along 400-fold 600mm distance from the ladle, the sliding plate is closed when the slag blocking cone is successful, the sliding plate is prevented from diffusing and increasing nitrogen, the ladle is driven to an argon station to carry out oxygen fixation and temperature measurement after the slag blocking cone is added, the oxygen content is 500-700 ppm, and the temperature is 1600-1630 ℃;
(4) RH refining process: after the oxygen determination and temperature measurement of the molten steel are completed, hoisting the ladle to an RH furnace for refining treatment, feeding the ladle into the RH furnace for post-treatment at the temperature of 1620-1640 ℃, and adjusting alloy components to be qualified by adopting a natural decarburization method, wherein the vacuum degree is less than or equal to 67Pa, the pure degassing time is 8-10 min, and the calming time is 15-20 min; the slag system component of the top slag after the RH vacuum treatment is CaO: 45-55%, Al2O 3: 27-33%, SiO 2: less than or equal to 5.0 percent and FeO + MnO less than 2 percent;
(5) and a slab continuous casting process: and pouring the molten steel with qualified components after the RH furnace refining treatment, wherein the pouring temperature is 1548-1568 ℃, the casting blank drawing speed is 1.05-1.25 m/min to obtain a continuous casting blank, and the blank is directly loaded and rolled to obtain a food-grade tinplate casting blank.
2. The production method for smelting food-grade tinplate base material from vanadium-titanium-containing molten iron according to claim 1, wherein the chemical components and mass percentages of the vanadium-titanium-containing molten iron in step (1) are as follows: c: 3.9-4.4%, Si: 0.09-0.60%, Mn: 0.15-0.50%, P: 0.130-0.170%, S: 0.050-0.080%, V: 0.22-0.26%, Ti: 0.065-0.200%, Als: 0.0010-0.0020%, Cu: not more than 0.0060%, Cr: less than or equal to 0.09 percent, less than or equal to 0.02 percent of Ni, less than or equal to 0.009 percent of Mo, less than or equal to 0.004 percent of Pb, less than or equal to 0.001 percent of Sn, and the balance of Fe and inevitable impurities.
3. The production method for smelting food-grade tinplate base material from vanadium-titanium-containing molten iron according to claim 1 or 2, characterized in that the molten iron smelted in the converter in the step (3) comprises the following chemical components in percentage by mass: c: 0.03-0.04%, Si is less than or equal to 0.01%, Mn: 0.10-0.20%, P is less than or equal to 0.012%, S is less than or equal to 0.006%, V is less than or equal to 0.0005%, Ti is less than or equal to 0.0025%, Als: 0.0005-0.0010%, less than or equal to 0.01% of Cu, less than or equal to 0.03% of Cr, less than or equal to 0.02% of Ni, less than or equal to 0.001% of Mo, less than or equal to 0.0003% of Pb, less than or equal to 0.001% of Sn, and the balance of Fe and inevitable impurities.
4. The production method for smelting food-grade tinplate base material by using vanadium-titanium-containing molten iron as claimed in claim 1 or 2, wherein the refining slag compounded in the step (3), CaO: 45-55% of Al2O3：35～45%、SiO2：≤5.0%、H2O: less than 0.5 percent and the balance of impurities.
5. The production method for smelting food-grade tinplate base material from vanadium-titanium-containing molten iron according to claim 1 or 2, wherein the top slag modifier in the step (3) comprises 45-50% of pure Al, 18-30% of CaO, and Al2O3：≤15%、SiO2：≤8.0%、H2O: less than 0.5 percent and the balance of impurities.
6. The production method for smelting food-grade tinplate base material from vanadium-titanium-containing molten iron according to claim 1 or 2, wherein the chemical components and the mass percentages of the chemical components of the molten steel refined in the step (4) RH are as follows: c: 0.010-0.015%, Si is less than or equal to 0.02%, Mn: 0.10-0.20%, P is less than or equal to 0.012%, S is less than or equal to 0.006%, V is less than or equal to 0.0005%, Ti: 0.020-0.030%, Als: 0.020-0.050%, less than or equal to 0.01% of Cu, less than or equal to 0.06% of Cr, less than or equal to 0.04% of Ni, less than or equal to 0.001% of Mo, less than or equal to 0.0003% of Pb, less than or equal to 0.001% of Sn, and the balance of Fe and inevitable impurity elements.
7. The production method for smelting food-grade tinplate base material by using vanadium-titanium-containing molten iron according to claim 1 or 2, wherein the top slag component after the RH furnace refining in the step (4) is as follows: CaO: 45-55% of Al2O3：27～33%、SiO2Less than or equal to 5.0 percent, MgO: 3-8%, FeO + MnO less than or equal to 2%, and the balance of impurities.
8. The production method for smelting food-grade tinplate base material from vanadium-titanium-containing molten iron according to claim 1 or 2, characterized in that A, B, C, D types of coarse and fine inclusions in the low-power casting blank structure obtained by slab continuous casting in the step (5) of the method are both less than or equal to 0.5 grade.
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