CN110284049B - External refining method for increasing continuous casting furnace number of ultra-deep drawing cold-rolled enamel steel - Google Patents
External refining method for increasing continuous casting furnace number of ultra-deep drawing cold-rolled enamel steel Download PDFInfo
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Abstract
The invention discloses an external refining method for increasing the number of continuous casting furnaces of ultra-deep drawing cold rolling enamel steel, which is characterized in that molten iron and scrap steel are smelted into primary molten steel; carrying out first-step modification on ladle top slag in the alloy fine adjustment station process: the method has the advantages that the number of continuous casting furnaces of the ultra-deep drawing cold rolling enamel steel is increased from the previous 3-furnace continuous casting to 5-furnace continuous casting, the increasing rate is 66.7%, the batch, high efficiency and stable production of the ultra-deep drawing cold rolling enamel steel are realized, and the method has obvious economic benefit.
Description
Technical Field
The invention belongs to the technical field of steel making, and particularly relates to an external refining method for increasing the number of continuous casting furnaces of ultra-deep drawing cold-rolled enameled steel.
Background
The enamel product is generally formed by stamping a steel plate to form a base blank, and then enameling and sintering enamel on the surface of the base blank. The ultra-deep drawing cold rolling enamel steel has excellent stamping performance and fish scaling resistance, can meet the requirements of producing enamel products with complex shapes, high stamping difficulty and high enamel quality requirements, has the characteristics of ultra-low carbon, high sulfur, high nitrogen and high titanium as the components, and has no longer the difficulty of restricting the ultra-deep drawing cold rolling enamel steel along with the improvement of smelting technology. According to the metallurgical principle, the continuous casting molten steel of the steel grade has poor castability, and the flow accumulation is easily generated in the casting process to interrupt the production, thereby seriously restricting the release of the productivity of a steel mill and the improvement of the production efficiency. In order to avoid abnormal interruption of production, a common steel mill adopts a group production with small casting times (not more than 4 furnaces). For steel mills, the low number of continuous casting furnaces in the continuous casting process becomes a limiting link which restricts the production efficiency and the cost of deep drawing cold rolling enamel steel, and technical innovation is needed to solve the problem.
Disclosure of Invention
In order to solve the problems that the current mainstream steel plant is easy to accumulate the current and the number of continuous casting furnaces is low in the casting process of producing the aluminum and titanium containing ultra-deep drawing cold rolling enamel steel, the invention provides the external refining method for increasing the number of the continuous casting furnaces of the ultra-deep drawing cold rolling enamel steel.
The technical scheme provided by the invention is as follows:
an external refining method for increasing the number of continuous casting furnaces of ultra-deep drawing cold-rolled enamel steel comprises the following steps:
(1) smelting in a converter: smelting molten iron and scrap steel into primary molten steel;
(2) alloy fine adjustment station: carrying out first-step modification on the ladle top slag;
(3) RH vacuum refining furnace: and (3) decarbonizing and increasing nitrogen after RH molten steel circulation, determining oxygen when decarbonization starts, adding aluminum particles for deoxidation and alloying after decarbonization is finished, and adding a ladle top slag modifier for secondary modification after RH is broken.
Further, in the step (1), the smelting tapping temperature of the converter is controlled to be 1680-; the slag discharge amount of the chamber converter is controlled during the tapping of the converter.
Furthermore, in the step (1), the adding amount of lime is 2-5 kg/ton steel; the flow rate of argon gas is set to 100-400Nm3Hour/hour; the slag discharge amount of the converter is not more than 4.5 kg/ton steel.
In the step (2), the requirements of the ladle top slag modifier used in the first step of modification are as follows: metallic Aluminum (MAL) not less than 45.0%, SiO2≤8.0％、H2O is less than or equal to 8.0 percent; granularity: 5-28mm is more than 85 percent and more than 30mm is less than or equal to 5 percent; the addition amount of the ladle top slag modifier is 1-3kg per ton of steel.
In the step (2), the ladle top slag modifier is added through a distributor, and during the period, the ladle bottom argon blowing is not started.
In the step (3), decarburization and nitrogen increase are carried out after RH molten steel circulation, and the nitrogen increase conditions are as follows: during the decarburization period, the lift gas is nitrogen, and the flow rate of nitrogen is set to 170-190Nm3The time is more than or equal to 10 minutes under the condition that the vacuum degree is required to be less than or equal to 2.6 mbar;
in the step (3), oxygen is determined when decarburization begins, and if the carbon content of molten steel is more than or equal to +150ppm and the oxygen content of molten steel is less than or equal to +300ppm, carbon-oxygen matching is performed, and natural decarburization is adopted; if the oxygen content of the molten steel is less than the carbon content of the molten steel and is more than 150ppm, the carbon content is high and the oxygen content is low, and an RH top lance is adopted for blowing oxygen; if the oxygen content of the molten steel is more than the carbon content of the molten steel and is more than 300ppm, the carbon is low, and a carburant is added for pre-deoxidation, so that the aim is to control the activity oxygen of the molten steel at 150-300ppm after the decarburization is finished.
In the step (3), adding the deoxidized aluminum particles into the deoxidized aluminum particles for 6 minutes to increase nitrogen, wherein the nitrogen increasing condition is as follows: the lift gas is nitrogen, and the flow rate of nitrogen is set to be 180-200Nm3Per hour, the vacuum was set at 50 to 100 mbar.
In the step (3), adding the deoxidized aluminum particles for 6 minutes, adding ferrosulfur, electrolytic manganese, ferrotitanium and a copper plate to alloy the molten steel, and synchronously increasing nitrogen in the molten steel; adding sulfur iron, electrolytic manganese, ferrotitanium and a copper plate, and circulating the molten steel for 18-24 minutes; the nitrogen increasing conditions are as follows: the lift gas is nitrogen, and the flow rate of nitrogen is set to be 180-200Nm3Per hour, the vacuum was set at 50 to 100 mbar.
In the step (3), the ladle top slag modifier for secondary modification is required to be: MAL is more than or equal to 45.0 percent, CaO is more than or equal to 45.0 percent, and SiO2≤8.0％、H2O is less than or equal to 0.5 percent, and the granularity is as follows: 5-28mm is more than 85 percent and more than 30mm is less than or equal to 5 percent; the adding amount of the ladle top slag modifier is adjusted according to RH oxygen blowing amount: when the RH oxygen blowing amount is 0, adding 150-200 kg; RH oxygen blowing amount is 0-100Nm3When the temperature is high, 200-300kg is added; RH oxygen blowing amount of 101-200Nm3When the temperature is increased to 400kg, the RH oxygen blowing amount is more than or equal to 201Nm3When the dosage is 400-500 kg.
Further, the extra-furnace refining method for increasing the number of continuous casting furnaces of the extra-deep drawing cold-rolled enamel steel comprises the following chemical components in percentage by weight: less than or equal to 0.005 percent of carbon, less than or equal to 0.030 percent of silicon, 0.05 to 0.35 percent of manganese, less than or equal to 0.020 percent of phosphorus, 0.015 to 0.035 percent of sulfur, 0.015 to 0.050 percent of acid-soluble aluminum, 0.070 to 0.10 percent of titanium, 0.0050 to 0.0100 percent of nitrogen, 0.02 to 0.04 percent of copper, and the balance of iron and inevitable impurities.
The invention provides a preparation method of high-extra-deep drawing cold-rolled enamel steel, which comprises the processes of converter smelting → an alloy fine-tuning station → an RH vacuum refining furnace → slab continuous casting, wherein the steps of the converter smelting, the alloy fine-tuning station and the RH vacuum refining furnace are carried out according to the method.
The invention controls the slag amount of the converter, lime is added during tapping, the alloy fine-tuning station is added, and the RH is added after the gap is brokenMeasures such as a ladle top slag modifier and the like reduce the oxidability of slag and reduce secondary oxidation during casting so as to reduce Al inclusion2O3The amount of production. In the invention, the ladle top slag is subjected to primary modification in the alloy fine-tuning station procedure, the oxidability of the slag is lower, the oxygen content of molten steel is high in the RH decarburization process, and oxygen is transferred from the molten steel to the top slag to enhance the oxidability of the ladle in the RH treatment period, so that the ladle top slag is subjected to secondary modification after RH breaking;
the oxygen content of 150-300ppm after RH chemical heating and RH decarburization control are avoided by high-temperature tapping of the converter, thereby not only meeting the decarburization requirement of molten steel, but also reducing the deoxidation product Al to the maximum extent2O3The amount of production; meanwhile, the removal of impurities is promoted by improving the flow of the lifting gas after RH deoxidation, and the cleanliness of molten steel is improved, so that the castability of the molten steel is improved.
By the external refining method for increasing the number of continuous casting furnaces of the ultra-deep drawing cold rolling enamel steel, the nitrogen content can be accurately controlled, the number of continuous casting furnaces is greatly increased, and batch, efficient and stable production of the ultra-deep drawing cold rolling enamel steel is realized.
By adopting the method, the number of the continuous casting furnaces of the ultra-deep drawing cold rolling enamel steel is increased from the former 3-furnace continuous casting to 5-furnace continuous casting, the increasing rate is 66.7 percent, the batch, high-efficiency and stable production of the ultra-deep drawing cold rolling enamel steel is realized, and the method has obvious economic benefit.
Drawings
FIG. 1 is a flow chart of the external refining method for increasing the number of continuous casting furnaces of ultra-deep drawing cold rolling enamel steel in the invention.
Detailed Description
The technical idea of the patent is explained in detail below by combining a set of 5-furnace ultra-deep drawing cold rolling enamel steel smelted by a 300-ton converter-RH furnace in a steel plant.
Example 1
An external refining method for increasing the number of continuous casting furnaces of ultra-deep drawing cold-rolled enamel steel comprises the following steps:
(1) and (4) smelting in a converter. The molten steel of the converter is qualified, and steel is tapped when the end temperature of the molten steel reaches the target, and the tapping temperature is shown in table 1.
TABLE 1 converter tapping thermometer
| Furnace number | A | B | C | D | E |
| Tapping temperature/. degree C | 1698 | 1695 | 1697 | 1692 | 1690 |
(2) Adding lime during converter tapping, opening a ladle to blow argon at the bottom during lime adding, and closing bottom blowing argon after lime is melted. The lime addition and argon flow are specified in Table 2.
TABLE 2 lime addition and argon flow during tapping of the converter
(3) The converter controlled the amount of slag, and the specific amount of slag is shown in Table 3.
TABLE 3 converter tap Steel amount
| Furnace number | A | B | C | D | E |
| Ladle slag thickness/mm | 48 | 42 | 50 | 45 | 50 |
| Slag amount/kg/ton steel of converter | 3.3 | 2.8 | 4.3 | 2.4 | 2.9 |
(4) After molten steel enters an alloy fine-tuning station, a ladle top slag modifier is added through a distributor, and during the period, ladle bottom argon blowing is not started. The amount and composition of the ladle slag modifier are shown in Table 4.
TABLE 4 Steel ladle top slag modifier addition and composition TABLE
(5) After the molten steel enters RH, vacuum pumping is carried out to start decarburization and nitrogen increase. Specific control parameters are shown in table 5.
TABLE 5 RH decarburization period main control parameter table
(6) And adding aluminum particles for deoxidation and alloying after the decarburization is finished. Adding deoxidized aluminum particles in 6 minutes after the addition (second step of nitrogen increasing), wherein the lift gas is nitrogen, and the nitrogen flow rate is set to be 180-200Nm3Per hour, setting the vacuum degree to be 50-100 mbar; the specific control parameters are shown in table 6.
TABLE 6 parameter table of deoxidation and alloying process by adding aluminum particles
(7) Adding the deoxidized aluminum particles for 6 minutes, and then adding the ferro-sulphur, the electrolytic manganese, the ferrotitanium and the copper plate to alloy the molten steel. And (3) circulating the molten steel for 15-20 minutes after the ferro-sulphur, the electrolytic manganese, the ferrotitanium and the copper plate are added, and breaking the air. The lift gas is nitrogen, and the flow rate of nitrogen is set to be 180-200Nm3Per hour, the vacuum was set at 50 to 100 mbar. Specific control parameters and results are shown in table 7.
TABLE 7 alloying Process parameters of addition alloys and RH breaking chemistry
(8) RH breaks empty. Adding a ladle top slag modifier after the air is broken, wherein the requirements are as follows: MAL is more than or equal to 45.0 percent, CaO is more than or equal to 45.0 percent, and SiO2≤8.0％、H2O is less than or equal to 0.5 percent, and the granularity is as follows: 5-28mm is more than 85 percent, and more than 30mm is less than or equal to 5 percent. The adding amount of the ladle top slag modifier is adjusted according to RH oxygen blowing amount: when the RH oxygen blowing amount is 0, adding 150-200 kg; RH oxygen blowing amount is 0-100Nm3When the temperature is high, 200-300kg is added; RH oxygen blowing amount of 101-200Nm3When the oxygen is blown into the container, 300-400kg of RH oxygen blowing agent is addedThe amount is more than or equal to 201Nm3When the temperature is high, 500kg of the catalyst is added; the addition requirements are as follows: is uniformly arranged on the surface of the ladle top slag. The specific control parameters are shown in Table 8.
TABLE 8 addition of post-RH ladle top slag modifier and composition
Therefore, by adopting the method, the number of the continuous casting furnaces of the ultra-deep drawing cold rolling enamel steel is increased from the previous 3-furnace continuous casting to 5-furnace continuous casting, the increasing rate is 66.7 percent, the batch, efficient and stable production of the ultra-deep drawing cold rolling enamel steel is realized, and the method has obvious economic benefit.
The above detailed description of the method for refining outside the furnace for increasing the number of continuous casting furnaces for ultra-deep drawing cold rolling enamel steel with reference to the examples is illustrative and not restrictive, and several examples can be cited within the limits of the present invention, so that variations and modifications without departing from the general concept of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. An external refining method for increasing the number of continuous casting furnaces of ultra-deep drawing cold rolling enamel steel is characterized by comprising the following steps:
(1) smelting in a converter: smelting molten iron and scrap steel into primary molten steel;
(2) alloy fine adjustment station: carrying out first-step modification on the ladle top slag;
(3) RH vacuum refining furnace: decarbonizing and increasing nitrogen after RH molten steel circulation, determining oxygen when decarbonization starts, adding aluminum particles for deoxidation and alloying after decarbonization is finished, and adding a ladle top slag modifier for secondary modification after RH is broken;
in the step (1), the smelting and tapping temperature of the converter is controlled to be 1680-;
in the step (1), the adding amount of lime is 2-5kg per ton of steel; the slag discharging amount of the converter is not more than 4.5 kg/ton steel;
in the step (2), the step (c),the requirements of the ladle top slag modifier used in the first-step modification are as follows: metal Al (MAL) is more than or equal to 45.0%, CaO is more than or equal to 45.0%, SiO2≤8.0%、H2O ≤0.5%；
In the step (3), the nitrogen increasing conditions are as follows: during the decarburization period, the lift gas is nitrogen, and the flow rate of nitrogen is set to 170-190Nm3The time is more than or equal to 10 minutes under the condition that the vacuum degree is required to be less than or equal to 2.6 mbar; oxygen is determined when the decarburization begins, and the activity oxygen of the molten steel is controlled to be 150-300ppm after the decarburization ends;
in the step (3), adding the deoxidized aluminum particles into the deoxidized aluminum particles for 0 to 6 minutes to increase nitrogen, wherein the nitrogen increasing condition is as follows: the lift gas is nitrogen, and the flow rate of nitrogen is set to be 180-200Nm3Per hour, setting the vacuum degree to be 50-100 mbar;
in the step (3), the ladle top slag modifier for secondary modification is required to be: metal Al (MAL) is more than or equal to 45.0%, CaO is more than or equal to 45.0%, SiO2≤8.0%、H2O ≤0.5%。
2. The external refining method for increasing the number of continuous casting furnaces of ultra-deep drawing cold rolling enamel steel as claimed in claim 1, wherein in the step (1), during the lime adding period, ladle bottom blowing argon is started, and after lime is melted, bottom blowing argon is closed.
3. The secondary refining method for increasing the number of continuous casting furnaces for extra-deep drawing cold-rolled enameled steel as claimed in claim 2, wherein in the step (1), the argon flow is set to 100-400Nm3In terms of hours.
4. The external refining method for increasing the continuous casting furnace number of the ultra-deep drawing cold rolling enamel steel as claimed in claim 1, wherein in the step (2), the ladle top slag modifier used in the first step of modification has a particle size of: 5-28mm is more than 85 percent and more than 30mm is less than or equal to 5 percent; the addition amount of the ladle top slag modifier is 1-3kg per ton of steel.
5. The method for increasing the number of continuous casting furnaces of ultra-deep drawing cold-rolled enameled steel according to any one of claims 1-4The external refining method is characterized in that in the step (3), after the deoxidized aluminum particles are added for 6 minutes, ferro-sulphur, electrolytic manganese, ferrotitanium and a copper plate are added to alloy the molten steel, and the nitrogen is continuously and synchronously added to the molten steel; adding sulfur iron, electrolytic manganese, ferrotitanium and a copper plate, and circulating the molten steel for 18-24 minutes; the nitrogen increasing conditions are as follows: the lift gas is nitrogen, and the flow rate of nitrogen is set to be 180-200Nm3Per hour, the vacuum was set at 50 to 100 mbar.
6. The external refining method for increasing the number of continuous casting furnaces of ultra-deep drawing cold rolling enamel steel as claimed in any one of claims 1 to 4, wherein in the step (3), the ladle top slag modifier for secondary modification has a particle size: 5-28mm is more than 85 percent and more than 30mm is less than or equal to 5 percent; the adding amount of the ladle top slag modifier is adjusted according to RH oxygen blowing amount: when the RH oxygen blowing amount is 0, adding 150-200 kg; 0 < RH oxygen blowing amount is less than or equal to 100Nm3When the temperature is high, 200-300kg is added; RH oxygen blowing amount of 101-200Nm3When the temperature is increased to 400kg, the RH oxygen blowing amount is more than or equal to 201Nm3When the dosage is 400-500 kg.
7. The external refining method for increasing the continuous casting furnace number of the ultra-deep drawing cold rolling enamel steel as claimed in any one of claims 1 to 4, wherein the ultra-deep drawing cold rolling enamel steel comprises the following chemical components in percentage by weight: less than or equal to 0.005 percent of carbon, less than or equal to 0.030 percent of silicon, 0.05 to 0.35 percent of manganese, less than or equal to 0.020 percent of phosphorus, 0.015 to 0.035 percent of sulfur, 0.015 to 0.050 percent of acid-soluble aluminum, 0.070 to 0.10 percent of titanium, 0.0050 to 0.0100 percent of nitrogen, 0.02 to 0.04 percent of copper, and the balance of iron and inevitable impurities.
8. The preparation method of the high ultra-deep drawing cold rolling enamel steel comprises the processes of converter smelting → an alloy fine-tuning station → an RH vacuum refining furnace → slab continuous casting, and is characterized in that the steps of the converter smelting, the alloy fine-tuning station and the RH vacuum refining furnace are carried out according to the external refining method of any one of claims 1 to 7.
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| CN111334635B (en) * | 2020-03-16 | 2021-12-21 | 包头钢铁（集团）有限责任公司 | Method for modifying top slag of deep-drawing steel |
| CN112342333A (en) * | 2020-11-06 | 2021-02-09 | 马鞍山钢铁股份有限公司 | High-efficiency low-oxygen-level ultra-low-carbon steel production method |
| CN112646953B (en) * | 2020-11-23 | 2022-12-16 | 首钢集团有限公司 | Steel slag modification method of ultra-low carbon steel |
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| CN103469075B (en) * | 2013-09-18 | 2016-04-13 | 济钢集团有限公司 | A kind of ultra-deep of ASP duplex explained hereafter rushes cold rolling Glassed Steel and manufacture method thereof |
| CN103643118A (en) * | 2013-12-26 | 2014-03-19 | 马钢(集团)控股有限公司 | Hot-rolled and pickled steel plate for 380MPa-grade single-sided enamel and production method thereof |
| CN103643119A (en) * | 2013-12-26 | 2014-03-19 | 马钢(集团)控股有限公司 | Hot-rolled and pickled steel plate for 210MPa-grade single-sided enamel and production method thereof |
| CN108950361B (en) * | 2018-08-10 | 2020-12-04 | 攀钢集团西昌钢钒有限公司 | Steelmaking method |
| CN109652739B (en) * | 2019-01-22 | 2020-08-18 | 山东钢铁股份有限公司 | High-strength cold-rolled steel strip for enamel and preparation method thereof |
| CN109943779B (en) * | 2019-04-30 | 2021-02-05 | 马鞍山钢铁股份有限公司 | Low-carbon cold-rolled steel plate for enamel and production method thereof |
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