CN114395656B - Low-cost stable casting production method of weathering resistant steel based on thin slab - Google Patents

Low-cost stable casting production method of weathering resistant steel based on thin slab Download PDF

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CN114395656B
CN114395656B CN202210101917.5A CN202210101917A CN114395656B CN 114395656 B CN114395656 B CN 114395656B CN 202210101917 A CN202210101917 A CN 202210101917A CN 114395656 B CN114395656 B CN 114395656B
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CN114395656A (en
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任涛
王涛
赵占山
朱韶哲
刘林
胡正祥
陈洪民
赵梓云
武剑
张彦龙
陈旭
杜建
周伟
吴玉强
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Rizhao Steel Holding Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a low-cost stable casting production method of weathering steel based on a thin slab, which belongs to the field of steel production, comprises converter smelting and LF furnace refining, and is characterized in that: the weathering steel comprises Cu, cr and Ti, wherein in the smelting process of the converter, the steel is not deoxidized in the steel releasing process of the converter, and copper and chromium are supplemented; the mass ratio of the components of the molten steel after the converter is as follows: less than 0.05 percent of C, 0.2 to 0.25 percent of Cr, 0.15 to 0.2 percent of Cu and no control requirements on other components; in the LF furnace refining process, the method comprises the following steps: (1) heating and raising temperature: raising the temperature of the molten steel to be more than or equal to 1580 ℃; (2) supplementing phosphorus, copper and chromium; (3) blowing argon for decarburization; (4) replenishing ferrosilicon alloy; (5) adding aluminum wires for deoxidation; (6) desulfurizing, alloying and slagging; and (7) soft blowing. Compared with the prior art have low cost, the characteristics of high casting drawing speed.

Description

Low-cost stable casting production method of weathering resistant steel based on thin slab
Technical Field
The invention relates to a steel production method, in particular to a low-cost stable casting production method of weathering resistant steel suitable for thin slabs.
Background
The weathering steel is mainly manufactured by containers, the demand is large, and the weathering steel produced on a full endless thin slab production line at present has the advantages of low cost, thin specification, stable performance and the like.
In the actual production process, ferrosilicon, ferromanganese, ferrochromium, ferrophosphorus, copper plate and aluminum product deoxidizer are added at one time in the steel placing process of the converter; adding lime into a refining furnace, regulating slag, desulfurizing, finely regulating alloy components, adding ferrotitanium and treating calcium; the carbon requirement for steel discharge of the converter is high, and the carbon content of the steel at the arrival station is required to be less than 0.035%. The alloy amount is large, the smelting time is long, the oxygen over-blowing of a converter is high, the cost of the deoxidizer is high, a large amount of oxidizing inclusions are generated, the conditions of crystallizer liquid level fluctuation, thermocouple fluctuation and the like exist in the casting process of a continuous casting machine, the pulling speed stability is influenced, especially the pulling speed is increased to more than 4.6m/min, the fluctuation can reach more than 1.5, the current rolling specification can not meet the requirement when the continuous casting speed is reduced quickly, the requirement is excessive to the thick specification, and the delivery time of the product is influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low-cost stable casting production method of weathering steel based on a thin slab.
The technical scheme for solving the technical problem is as follows: a low-cost stable casting production method of weathering steel based on sheet billet comprises converter smelting and LF furnace refining, and is characterized in that: the weathering steel comprises Cu, cr and Ti, wherein in the smelting process of the converter, the steel is not deoxidized in the steel releasing process of the converter, and copper and chromium are supplemented; the mass ratio of the components of the molten steel after the converter is as follows: c is less than 0.05 percent, cr is 0.2 to 0.25 percent, cu is 0.15 to 0.2 percent, and other components have no control requirement;
in the LF furnace refining process, the method comprises the following steps:
(1) Heating and warming: raising the temperature of the molten steel to be more than or equal to 1580 ℃;
(2) Supplementing phosphorus, copper and chromium;
(3) Blowing argon for decarburization;
(4) Replenishing ferrosilicon alloy;
(5) Adding aluminum wires for deoxidation;
(6) Desulfurizing, alloying and slagging;
(7) And (4) soft blowing.
In the step (2), the additive is added according to the target of 0.06-0.07 percent of P, 0.23-0.24 percent of Cu and 0.26-0.28 percent of Cr0.06 percent of P.
In the step (2), the target P content is 0.06%, cu content is 0.23%, and Cr0.26% is added.
In the step (3), the stirring time is determined according to the content of carbon arriving at the station and the oxygen condition in the steel, the oxygen content in the steel is more than 350ppm, and the stirring time is not more than 5min; and (3) prolonging the stirring time for 1min to no more than 10min at each time of reducing the oxygen content by 20ppm until the carbon content of the molten steel is reduced to less than 0.035 percent.
In the step (4), the ferrosilicon alloy is added to the component Si of 0.20 to 0.22 percent for silicon alloying.
In the step (4), the target Si content is added according to 0.20% of Si.
In the step (6), firstly adding lime, supplementing ferromanganese alloy, finely adjusting the manganese content to 0.35-0.45%, supplementing lime after alloying, and feeding aluminum particles and calcium carbide for slag adjustment; after the desulfurized slag is produced, argon is blown to stir, and the S content of the molten steel is ensured to be less than 0.005 percent; after slagging is finished, feeding the ferrotitanium cored wire.
The ferromanganese alloy is low-carbon ferromanganese or medium-carbon ferromanganese alloy.
The titanium content in the ferrotitanium cored wire is 70%, and the ratio of iron to powder is 170:396.
in the step (7), stirring by adopting differential flow, then adjusting argon soft blowing, feeding calcium-iron core-spun yarns, performing secondary soft blowing after calcium treatment, closing argon, adding a carbon-free alkaline covering agent, preserving heat, and continuously casting molten steel on a station.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the carbon tapping requirement of the converter is reduced, so that the consumption of iron and steel materials can be effectively reduced, and the consumption of a deoxidizer is reduced; protecting the refractory of the converter, prolonging the service life of the converter, and reducing the cost of the aluminum product deoxidizer by about 0.15Kg/t;
2. the silicomanganese alloy is added separately, so that silicomanganese salt inclusions are reduced, and the use amount of a deoxidizer in the LF refining process is reduced;
3. the ferrotitanium alloy is replaced by the ferrotitanium core-spun yarn, so that the yield of titanium element can be effectively improved, the stability of components is ensured, and the generation of iron oxide and titanium nitrogen compounds is reduced;
4. an annular flow field is formed by differential flow control, so that the floating efficiency of impurities is improved, and the purity of molten steel is improved.
5. The liquid level and thermocouple fluctuation in the continuous casting process of the full endless rolling production line are stabilized, and the pulling speed can be increased to 4.9m/min.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The invention relates to a low-cost stable casting production method of weathering resistant steel based on a thin slab, which comprises the following steps: smelting in a converter, refining in an LF furnace, continuously casting to obtain a thin slab, and performing subsequent continuous rolling, cooling and coiling process flows. And the molten iron does not need to be pretreated.
The specific production steps and parameters are as follows, the production steel is weathering resistant steel, and the components comprise Cu, cr, ti and the like.
1. Smelting in a converter
The existing standard is that the carbon required by converter tapping is less than or equal to 0.035%, the invention reduces the carbon required by converter tapping, and the carbon content in the argon station is less than 0.05%. The carbon tapping requirement of the converter is reduced, so that the consumption of steel materials and iron materials can be effectively reduced, the consumption of the deoxidizer is reduced, and the cost of the aluminum product deoxidizer is reduced by about 0.15Kg/t; meanwhile, the refractory of the converter can be protected, and the service life of the converter can be prolonged.
The range of the molten steel [ O ] at the end point of the existing standard converter is 600ppm-1000ppm, the invention reduces the over-blowing of the converter and the oxygen (300-400 ppm) at the end point, thereby being beneficial to reducing the consumption of steel and iron materials and protecting the refractory material of the furnace lining;
the converter does not deoxidize in the steel releasing process, and chromium iron and a copper plate are supplemented according to the target ranges of 0.2-0.25% of Cr and 0.15-0.2% of Cu;
the mass ratio of the components of the molten steel after the converter is as follows: less than 0.05 percent of C, 0.2 to 0.25 percent of Cr, 0.15 to 0.2 percent of Cu and no control requirements on other components.
2. Refining in LF furnace
In the refining process of the LF furnace, carrying out deoxidation, desulfurization, component alloy addition and inclusion removal in the LF furnace; in the following steps, the addition of raw materials is based on the matching of the amount of molten steel of 300 t.
(1) Heating and raising temperature
The LF furnace enters a station, is subjected to oxygen determination and sampling, is heated and heated, and the temperature of molten steel is increased to be more than or equal to 1580 ℃;
(2) Supplementing phosphorus, copper and chromium
According to the arrival components, supplementing phosphorus by taking 0.06-0.07 percent as a target, and supplementing ferrochrome and copper plates by taking 0.23-0.24 percent of copper and 0.26-0.28 percent of chromium as components; in the optimized scheme, ferrochrome and a copper plate are added according to 0.23 percent of Cu and 0.26 percent of Cr0.26;
(3) Blowing argon for decarburization
Regulating the argon blown from the bottom of the steel ladle to a bypass valve, wherein the pipeline pressure is more than 1.6bar, so that the whole steel surface is guaranteed to turn over, thereby promoting the residual oxygen and carbon in the steel to further react to generate CO gas and reducing the carbon oxygen content in the steel;
the stirring time is determined according to the arrival carbon content and the oxygen condition in the steel, the oxygen in the steel is more than 350ppm, and the stirring time is not more than 5min; and (3) prolonging the stirring time for 1min to no more than 10min at each time of reducing the oxygen content by 20ppm until the carbon content of the molten steel is reduced to less than 0.035 percent.
(4) Replenishing ferrosilicon alloy
Replenishing the ferrosilicon alloy to 0.20-0.22% of silicon as a component, and carrying out silicon alloying; in the optimization scheme, adding Si0.20% as a target;
(5) Adding aluminum wire for deoxidation
Then, adding 1000-1500 m aluminum wire for deoxidation;
(6) Desulfurization, alloying and slagging
Adding 2500-3500Kg of first batch of lime after deoxidation, supplementing low-carbon ferromanganese or medium-carbon ferromanganese alloy, and if the molten steel design also contains Ni or other alloys, supplementing the alloy and the ferromanganese alloy at the moment, finely adjusting the manganese content to 0.35-0.45%, and supplementing according to the lower limit in the optimization scheme; silicon and manganese alloys are added separately, so that the formation of silicomanganese salt inclusions is reduced, and the use amount of a deoxidizer in the LF refining process is reduced;
adding lime less than or equal to 1200Kg after alloying, feeding aluminum particles and calcium carbide to adjust slag, adding 15-35Kg of aluminum particles and 20-30Kg of calcium carbide once, and adding 10-20Kg of calcium carbide per minute in the optimized scheme;
after the desulfurized slag is produced, the flow of argon is adjusted to 80m 3 Stirring for 5-8min. Ensuring that the S content of the molten steel is less than 0.005 percent;
according to the slag condition, if no white slag occurs, lime is supplemented for less than or equal to 500 Kg/time;
after slagging is finished, feeding 350-450 m of ferrotitanium core-spun yarn, wherein the titanium content of the ferrotitanium core-spun yarn is 70%, and the ratio of iron to powder is 170:396. the ferrotitanium alloy is replaced by the ferrotitanium core-spun yarn, so that the yield of titanium element can be effectively improved, the stability of components is ensured, and the generation of iron oxide and titanium nitrogen compounds is reduced.
(7) Soft blowing
Stirring at a differential flow rate: the total time of the two stages is 6min, each stage is 3min, the first stage opens the argon gas of the gas permeable core at the side A to a bypass state, and the flow is used at the side BThe amount is 50-80m 3 H, after 3min, performing a second stage of opening the gas-permeable core at the side B to a bypass state, wherein the using flow rate of the side A is 50-80m 3 H is used as the reference value. Thereby forming an annular flow field and promoting floating and adsorption of impurities. An annular flow field is formed by differential flow control, so that the floating efficiency of impurities is improved, and the purity of molten steel is improved.
After the differential flow control, argon soft blowing is adjusted for 8-15min (the bare diameter of argon flowers on the molten steel surface is 50-100 mm), a calcium-iron core-spun yarn is fed for 280m (the content of Ca is more than 97%), and the soft blowing is carried out for the second time for 8-12 min after the calcium treatment. Argon flow during soft blowing is 10-30m 3 /h。
And closing argon, adding a carbon-free alkaline covering agent, preserving heat, and continuously casting the molten steel on a station.
The mass ratio of the components of the refined molten steel is as follows: 0.035 to 0.045 percent of C, less than or equal to 0.003 percent of S, 0.075 to 0.095 percent of P, 0.25 to 0.29 percent of Cu, 0.30 to 0.35 percent of Cr, 0.30 to 0.50 percent of Si, 0.40 to 0.50 percent of Mn0.015 to 0.050 percent of Als0.015 to 0.050 percent of Si.
3. Continuous casting
Molten steel refined from an LF furnace enters a continuous casting and rolling production line, the liquid level and thermocouple fluctuation in the continuous casting process is less than 1, and the drawing speed can be increased to 4.9m/min due to high purity of the molten steel, so that a sheet billet with the specification of 1.0-2.5mm is obtained.
And carrying out rough rolling, finish rolling, laminar cooling and coiling on the thin slab to obtain hot rolled strip steel with different thicknesses.
To better compare the process of the present application with the prior art, comparative tests were performed.
The pretreatment of molten iron and the converter smelting method of each example group and the control group are the same, and the difference lies in the LF furnace refining process.
In the converter smelting process: the over-blowing of the converter reaches 30 percent, no deoxidizer alloy is added in the steel releasing process of the converter, the mass ratio of the components of the molten steel after the converter is controlled according to the weight ratio of C less than 0.05 percent, cr 0.23 percent and Cu 0.18 percent, and other components have no control requirements.
The mass ratios of the molten steel components after refining in each of the examples and the control were controlled to C0.038%, S0.0025%, P0.079%, cu 0.26%, cr 0.33%, si0.34%, mn0.45%, and Als 0.025%.
The LF furnace refining process of each example set was operated according to the parameter ranges disclosed in the above steps.
In the LF furnace refining process of the control group:
(1) Heating and raising temperature
The LF furnace enters a station, oxygen is determined, sampling is carried out, heating and temperature rising are carried out, and the temperature of molten steel is raised to 1590 ℃;
(2) Blowing argon for decarburization
380ppm of oxygen arrives at the station, and the stirring time is 5min; the carbon content after stirring is 0.034%;
(3) Deoxidation
Adding 1500 m of aluminum wires;
(4) Desulfurizing, alloying and slagging
Adding 2000Kg of first batch of lime (300 t of molten steel amount) after deoxidation, sequentially supplementing low-carbon ferromanganese, copper plate, low-carbon ferrochrome and ferrosilicon according to the preset component control requirement, transmitting power for 20 minutes to ensure that the slag surface turns green, continuously supplementing 400Kg of lime, transmitting power for 3 minutes to ensure that the slag surface turns white, performing desulfurization and stirring, and opening argon to 50m 3 Stirring for 15min, and reducing S in the steel to 0.006 percent. Desulfurization to [ S ]]Adding 20-30kg of aluminum particles to the slag surface after the concentration is less than or equal to 0.003 percent, stirring for 1-2 min, slagging again, and then carrying out titanium alloying, wherein the titanium alloying target is controlled according to the internal control of 0.025-0.045 percent.
(5) Soft blowing
The set flow of 2 air permeable cores of the steel ladle is 15-25m 3 And h, the flow is the same, and the diameter of the argon flower is ensured to be one basketball size.
The results of each group are compared in the following table
Dosage of deoxidizer Yield of titanium element Purity of molten steel Maximum steady pull speed
Example 1 3.1Kg/t 92％ Fluctuation 0.5 4.9m/min
Example 2 3.25Kg/t 94.5％ Fluctuation 0.4 4.9m/min
Example 3 3.08Kg/t 90.3％ Fluctuation 0.6 4.9m/min
Control group 3.53Kg/t 72.3％ Fluctuation 1.8 4.5m/min
The results of all groups show that the method can reduce the consumption of the deoxidizer in the LF refining process, effectively improve the yield of the titanium element, improve the purity of the molten steel by improving the floating efficiency of the inclusion, and improve the maximum stable pulling speed to 4.9m/min. When the pulling speed of the comparison group is higher than 4.6m/min, the fluctuation can reach more than 1.5, so the maximum stable pulling speed can only reach 4.5m/min, and when the continuous casting speed reduction is higher, the current rolling specification can not meet the requirement, the product delivery time is influenced because the rolling specification is excessive to the thick specification.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.

Claims (7)

1. A low-cost stable casting production method of weathering steel based on sheet billet comprises converter smelting and LF furnace refining, and is characterized in that: the weather-resistant steel comprises Cu, cr and Ti, wherein in the smelting process of the converter, the steel is not deoxidized in the steel releasing process of the converter, and the Cu and the Cr are supplemented; the mass ratio of the components of the molten steel after the converter is as follows: less than 0.05 percent of C, 0.2 to 0.25 percent of Cr, 0.15 to 0.2 percent of Cu and no control requirements on other components;
in the LF furnace refining process, the method comprises the following steps:
(1) Heating and warming: raising the temperature of the molten steel to be more than or equal to 1580 ℃;
(2) Supplementing phosphorus, copper and chromium;
(3) Blowing argon for decarburization; the stirring time is determined according to the arrival carbon content and the oxygen condition in the steel, the oxygen in the steel is more than 350ppm, and the stirring time is not more than 5min; when the oxygen content is reduced by 20ppm, the stirring time is prolonged by 1min, and the longest stirring time is not more than 10min, so as to carry out decarburization reaction until the carbon content of the molten steel is reduced to be less than 0.035%;
(4) Replenishing ferrosilicon alloy; replenishing the ferrosilicon alloy to the content of Si of 0.20-0.22 percent, and carrying out silicon alloying;
(5) Adding aluminum wires for deoxidation;
(6) Desulfurizing, alloying and slagging; firstly adding lime, supplementing ferromanganese, finely adjusting the manganese content to 0.35-0.45%, supplementing lime after alloying, and feeding aluminum particles and calcium carbide for slag adjustment; after the desulfuration slag is manufactured, argon is blown to stir, and the S content of the molten steel is ensured to be less than 0.005 percent; after slagging is finished, feeding the ferrotitanium core-spun yarn;
(7) Soft blowing: the soft blowing is carried out by adopting differential flow stirring.
2. The low-cost stable casting production method of the weathering steel based on thin slab as claimed in claim 1, characterized in that: in the step (2), the additive is supplemented according to the target of 0.06-0.07% of P, 0.23-0.24% of Cu and 0.26-0.28% of Cr0.06%.
3. The low-cost stable casting production method of the sheet bar-based weathering steel according to claim 2, characterized in that: in the step (2), the target supplement is performed according to the proportion of 0.06 percent of P, 0.23 percent of Cu and 0.26 percent of Cr0.26 percent.
4. The low-cost stable casting production method of the weathering steel based on thin slab as claimed in claim 1, characterized in that: in the step (4), the target addition is carried out according to Si 0.20%.
5. The low-cost stable casting production method of the weathering steel based on thin slabs according to claim 1, characterized in that: the ferromanganese alloy is low-carbon ferromanganese or medium-carbon ferromanganese alloy.
6. The low-cost stable casting production method of the weathering steel based on thin slab as claimed in claim 1, characterized in that: the titanium content in the ferrotitanium core-spun yarn is 70%, and the ratio of iron to powder is 170:396.
7. the low-cost stable casting production method of the weathering steel based on thin slabs according to claim 1, characterized in that: in the step (7), stirring is carried out by adopting differential flow, then argon gas soft blowing is adjusted, calcium-iron core-spun yarns are fed, secondary soft blowing is carried out after calcium treatment, argon gas is closed, a carbon-free alkaline covering agent is added for heat preservation, and molten steel is continuously cast on a station.
CN202210101917.5A 2022-01-27 2022-01-27 Low-cost stable casting production method of weathering resistant steel based on thin slab Active CN114395656B (en)

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CN202310178118.2A CN116159975A (en) 2022-01-27 2022-01-27 High-pulling-speed preparation process of weather-resistant steel sheet billet
CN202210101917.5A CN114395656B (en) 2022-01-27 2022-01-27 Low-cost stable casting production method of weathering resistant steel based on thin slab

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Denomination of invention: A low-cost and stable casting production method for weather resistant steel based on thin slab

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