CN113337772A - Method for producing IF steel by using vanadium-extracting semisteel - Google Patents

Method for producing IF steel by using vanadium-extracting semisteel Download PDF

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CN113337772A
CN113337772A CN202110566785.9A CN202110566785A CN113337772A CN 113337772 A CN113337772 A CN 113337772A CN 202110566785 A CN202110566785 A CN 202110566785A CN 113337772 A CN113337772 A CN 113337772A
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CN113337772B (en
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裴晓宇
方鸣
宋慧强
徐国明
马魁
张文杰
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HBIS Co Ltd Chengde Branch
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    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • 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
    • C21C7/0025—Adding carbon material
    • 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
    • C21C7/06—Deoxidising, e.g. killing
    • 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
    • C21C7/064—Dephosphorising; Desulfurising
    • 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
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
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  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a method for producing IF steel by using vanadium-extracting semisteel, which comprises the following steps: vanadium extraction from molten iron → desulfurization of semisteel → smelting in a converter → LF refining → RH refining → continuous casting; the produced IF steel comprises the following chemical components in percentage by mass: less than or equal to 0.004%, less than or equal to 0.03%, Mn: 0.10-0.20%, P is less than or equal to 0.012%, S is less than or equal to 0.008%, Ti: 0.055-0.070%, ALs: 0.020-0.045%, N is less than or equal to 0.0040%, and O is less than or equal to 10 ppm; the balance of Fe and inevitable impurities. The method provided by the invention achieves the purpose of vanadium extraction while ensuring the dephosphorization effect, and the production process is stable.

Description

Method for producing IF steel by using vanadium-extracting semisteel
Technical Field
The invention relates to the technical field of metallurgy, and particularly belongs to a method for producing IF steel by using vanadium-extracted semisteel.
Background
With the more and more extensive application of vanadium in steel and other industries, the economic benefit brought by vanadium products is higher and higher, after vanadium extraction treatment is carried out on vanadium-containing molten iron, the contents of C, Mn and Si in semisteel are far lower than those of normal molten iron, chemical heat sources are few in the blowing process, slag system components are single, and the subsequent converter smelting has greater difficulties in temperature control, slagging and dephosphorization.
In order to ensure that the final phosphorus content of molten steel is controlled to be below 0.013%, the existing technology for producing IF steel by using vanadium-containing molten iron abandons the process of vanadium extraction from molten iron and changes the process into dephosphorization, and the specific process is the production mode of smelting vanadium-containing molten iron → a dephosphorization converter → composite injection desulfurization → semisteel in the converter, so that the production mode seriously influences the yield of vanadium slag and causes the loss of a large amount of vanadium elements.
Disclosure of Invention
In order to solve the problem of large loss of vanadium, the invention provides a method for producing IF steel by using vanadium-extracting semisteel, which achieves the purpose of vanadium extraction while ensuring the dephosphorization effect and has stable production process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for producing IF steel by using vanadium-extracted semisteel comprises the following steps: vanadium extraction from molten iron → semisteel desulfurization → converter smelting → LF refining → RH refining → continuous casting.
Vanadium extraction from the molten iron: molten iron with proper components is fed into a vanadium extraction furnace for vanadium extraction treatment, and the molten iron with low S, P content is selected as much as possible according to mass percentage, wherein S is less than or equal to 0.06 percent, and P is less than or equal to 0.12 percent. And crude oxygen is adopted for vanadium extraction in the vanadium extraction process, the blowing temperature is controlled to be between 1300 ℃ and 1400 ℃, the vanadium extraction rate is ensured, meanwhile, the crushing material is added in the blowing process for the first-step dephosphorization, and a proper amount of aluminum, silicon-manganese alloy and silicon iron are added for the oxidation adjustment of the semi-steel, so that heat is supplemented, and the pretreatment is carried out for the next desulfurization. The semisteel obtained after vanadium extraction treatment comprises the following steps: t is more than 1360 ℃, C is more than or equal to 3.7 percent and less than or equal to 4.0 percent, P is less than or equal to 0.11 percent, and Si and Mn are traces.
And (3) desulfurization of the semisteel: hoisting the semisteel subjected to vanadium extraction to a desulfurization process, and carrying out composite blowing desulfurization and slagging-off treatment on the semisteel, wherein the process comprises the following steps: (1) carrying out desulfurization treatment on the iron ladle containing the blast furnace molten iron in a desulfurization station by a composite desulfurization method; (2) and carrying out slagging-off treatment on the desulfurized molten iron by using a slagging-off machine, wherein the S content of the desulfurized semisteel is less than or equal to 0.003 percent, and the slagging-off rate is more than or equal to 98 percent.
Smelting in the converter: and (3) delivering the desulfurized semisteel into a decarburization converter for smelting, strictly controlling the process temperature and the slag condition, and improving the dephosphorization efficiency. Adding refining slag and small-sized ash in the tapping process, tapping without deoxidation, using a sliding plate to carry out slag stopping operation, reducing the slag discharge amount, using a slag stopping plug when the content of the tapping endpoint P is close to the edge, ensuring the slag stopping effect, and controlling the tapping time to be 6-8 min. The content of the trace elements is reduced by controlling the oxidizability in the blowing process, the end point oxygen of the converter is controlled according to the target value of 700-plus-900 ppm, the end point oxygen is higher than the target value of 900-plus-1000 ppm, and a proper amount of low-nitrogen bottom nitrogen carburant is added in the tapping process for the end point oxygen control. Calculated by mass percent, T is more than or equal to 1650 ℃ and less than or equal to 1670 ℃, C is more than or equal to 0 and less than or equal to 0.04%, P is less than or equal to 0.010%, and S is less than or equal to 0.008% of the molten steel tapped from the decarburization converter.
And LF refining: performing LF refining treatment on the molten steel, and adjusting the manganese content of steel types and supplementing heat by adding a proper amount of medium-carbon ferromanganese, wherein the addition amount of Mn alloy is based on the standard that Mn elements in the molten steel do not exceed the upper limit; a small amount of lime is added in the refining process to ensure the submerged arc effect, when the oxygen content in the argon station is close to or exceeds 900ppm, a proper amount of aluminum modifying agent can be added before tapping to remove part of oxygen in slag for top slag modification, so that the condition of foaming slag is avoided, and the subsequent RH furnace treatment is not influenced. Calculated by mass percent, T is more than or equal to 1610 ℃ and less than or equal to 1620 ℃, C is more than or equal to 0 and less than or equal to 0.04%, Mn is more than or equal to 0.10% and less than or equal to 0.20%, Si is more than or equal to 0 and less than or equal to 0.01%, P is less than or equal to 0.010%, and S is less than or equal to 0.008% in molten steel refined by an LF furnace.
And RH refining: carrying out RH furnace circulation degassing treatment on the molten steel, wherein in the RH treatment process: the ultimate vacuum degree is not higher than 300kpa, the pure degassing time is 6-12min, the exhaust time is 20-40min, the calming time is 15-20min, Ti alloying and component fine adjustment of Mn element are carried out in the treatment process, and tapping is carried out after the requirement of the control key point is met. Tapping molten steel: t is more than or equal to 1580 ℃ and less than or equal to 1590 ℃, C is more than or equal to 0 and less than or equal to 0.003 percent, Mn is more than or equal to 0.10 and less than or equal to 0.20 percent, Si is more than or equal to 0 and less than or equal to 0.02 percent, Ti is more than or equal to 0.060 percent and less than or equal to 0.070 percent, P is less than or equal to 0.010 percent, S is less than or equal to 0.007 percent, N is less than or equal to 0.0030 percent, O: less than or equal to 10 ppm.
The continuous casting process comprises the following steps: adopting protective casting, using carbon-free covering agent, 600-plus-one 1500kg of head furnace covering agent, 600-plus-one continuous drawing, 20-45 ℃ of head furnace superheat degree, 20-40 ℃ of continuous drawing furnace superheat degree and no more than 0.0009% of continuous casting recarburization.
The IF steel produced by the invention comprises the following chemical components in percentage by mass: c: less than or equal to 0.004%, Si: less than or equal to 0.03%, Mn: 0.10-0.20%, P: 0.012%, S is less than or equal to 0.008%, Ti: 0.055-0.070%, ALs: 0.020-0.045%, N: less than or equal to 0.0040 percent, O: less than or equal to 10 ppm; the balance of Fe and inevitable impurities.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
1. according to the invention, the IF steel plate with yield strength less than or equal to 300MPa, tensile strength less than or equal to 360MPa and elongation more than or equal to 33% is obtained through titanium strengthening and component design for reducing manganese content and through reasonable control of various process parameters.
2. The production method of the IF steel provided by the invention is additionally provided with a vanadium extraction process, the semisteel after vanadium extraction enters a desulfurization process, and the vanadium slag is subjected to next treatment, so that economic benefits can be generated.
3. According to the invention, silicon-manganese alloy and aluminum are used for deoxidation in the vanadium extraction converter stage, so that the desulfurization efficiency is improved, and the dephosphorization function is added according to the characteristic of low-temperature vanadium extraction.
4. The method provided by the invention improves the oxygen content of the converter tapping and can reduce the corrosion to the refractory material of the converter in the blowing process.
5. According to the invention, no aluminum deoxidizer is used during the tapping at the converter stage, and the low-nitrogen carburant is used for converter end point oxygen control only when the tapping end point oxygen exceeds 900ppm, so that the inclusion produced by using aluminum products for deoxidation can be effectively avoided.
6. The invention uses the medium carbon ferromanganese as a heat-supplementing agent in the refining stage, reduces the tapping temperature of the converter, shortens the blowing period and reduces the corrosion to the converter lining.
7. The average end point oxygen of the finished molten steel is below 10 ppm. Calculated by mass percent, the content of C in the IF steel is less than or equal to 0.004 percent, the content of Si is less than or equal to 0.03 percent, and the content of Mn: 0.10-0.20%, P is less than or equal to 0.012%, S is less than or equal to 0.008%, Ti: 0.055-0.070%, ALs: 0.020-0.045%, N less than or equal to 0.0040% and O less than or equal to 10ppm, so that the components of the molten steel can be uniform, and the component segregation phenomenon is remarkably reduced.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
A method for producing IF steel by using vanadium-extracted semisteel comprises the following steps: the method comprises the following specific operations of molten iron vanadium extraction → semisteel desulfurization → converter smelting → LF refining → RH refining → continuous casting:
molten iron with proper components is fed into a vanadium extraction furnace for vanadium extraction treatment, and the molten iron with low S, P content is selected as much as possible according to mass percentage, wherein S is less than or equal to 0.06 percent, and P is less than or equal to 0.12 percent. And crude oxygen is adopted for vanadium extraction in the vanadium extraction process, the blowing temperature is controlled to be between 1300 ℃ and 1400 ℃, the vanadium extraction rate is ensured, meanwhile, the crushing material is added in the blowing process for the first-step dephosphorization, and a proper amount of aluminum, silicon-manganese alloy and silicon iron are added for the oxidation adjustment of the semi-steel, so that heat is supplemented, and the pretreatment is carried out for the next desulfurization. The semisteel obtained after vanadium extraction treatment comprises the following steps: t is more than 1360 ℃, C is more than or equal to 3.7 percent and less than or equal to 4.0 percent, P is less than or equal to 0.11 percent, and Si and Mn are traces.
Hoisting the semisteel subjected to vanadium extraction to a desulfurization process, and carrying out composite blowing desulfurization and slagging-off treatment on the semisteel, wherein the process comprises the following steps: (1) carrying out desulfurization treatment on the iron ladle containing the blast furnace molten iron in a desulfurization station by a composite desulfurization method; (2) and carrying out slagging-off treatment on the desulfurized molten iron by using a slagging-off machine, wherein the S content of the desulfurized semisteel is less than or equal to 0.003 percent, and the slagging-off rate is more than or equal to 98 percent.
And (3) delivering the desulfurized semisteel into a decarburization converter for smelting, strictly controlling the process temperature and the slag condition, and improving the dephosphorization efficiency. Adding refining slag and small-sized ash in the tapping process, tapping without deoxidation, using a sliding plate to carry out slag stopping operation, reducing the slag discharge amount, using a slag stopping plug when the content of P at the tapping terminal point is close to the edge, ensuring the slag stopping effect, and controlling the tapping time to be 6-8 min. The content of the trace elements is reduced by controlling the oxidizability in the blowing process, the end point oxygen of the converter is controlled according to the target value of 700-plus-900 ppm, the end point oxygen is higher than the target value of 900-plus-1000 ppm, and a proper amount of low-nitrogen bottom nitrogen carburant is added in the tapping process for the end point oxygen control. Calculated by mass percent, T is more than or equal to 1650 ℃ and less than or equal to 1670 ℃, C is more than or equal to 0 and less than or equal to 0.04%, P is less than or equal to 0.010%, and S is less than or equal to 0.008% of the molten steel tapped from the decarburization converter.
Performing LF furnace treatment on the molten steel, and in a refining process, adjusting and supplementing the manganese content of steel by adding a proper amount of medium-carbon ferromanganese, wherein the addition amount of Mn alloy is based on the condition that Mn elements in the molten steel do not exceed the upper limit; a small amount of lime is added in the refining process to ensure the submerged arc effect, when the oxygen content in the argon station is close to or exceeds 900ppm, a proper amount of aluminum modifying agent can be added before tapping to remove part of oxygen in slag for top slag modification, so that the condition of foaming slag is avoided, and the subsequent RH furnace treatment is not influenced. Calculated by mass percent, T is more than or equal to 1610 ℃ and less than or equal to 1620 ℃, C is more than or equal to 0 and less than or equal to 0.04%, Mn is more than or equal to 0.10% and less than or equal to 0.20%, Si is more than or equal to 0 and less than or equal to 0.01%, P is less than or equal to 0.010%, and S is less than or equal to 0.008% in molten steel refined by an LF furnace.
Carrying out RH furnace circulation degassing treatment on the molten steel, wherein in the RH treatment process: the ultimate vacuum degree is not higher than 300kpa, the pure degassing time is 6-12min, the exhaust time is 20-40min, the calming time is 15-20min, Ti alloying and component fine adjustment of Mn element are carried out in the treatment process, and tapping is carried out after the requirement of the control key point is met. Tapping molten steel: t is more than or equal to 1580 ℃ and less than or equal to 1590 ℃, C is more than or equal to 0 and less than or equal to 0.003 percent, Mn is more than or equal to 0.10 and less than or equal to 0.20 percent, Si is more than or equal to 0 and less than or equal to 0.02 percent, Ti is more than or equal to 0.060 percent and less than or equal to 0.070 percent, P is less than or equal to 0.010 percent, S is less than or equal to 0.007 percent, N is less than or equal to 0.0030 percent, O: less than or equal to 10 ppm.
Adopting protective casting, using carbon-free covering agent, 600-plus-one 1500kg of head furnace covering agent, 600-plus-one continuous drawing, 20-45 ℃ of head furnace superheat degree, 20-40 ℃ of continuous drawing furnace superheat degree and no more than 0.0009% of continuous casting recarburization.
Example 1
The method comprises the steps of vanadium extraction by adopting a 150-ton converter, composite blowing desulfurization, smelting by adopting the 150-ton converter, LF refining, RH refining and slab continuous casting.
The semisteel temperature of the vanadium extraction converter is 1362 ℃, the carbon content is 3.8 percent, and the P content is 0.11 percent.
The content of S in the desulfurized molten iron is 0.0015 percent.
The tapping temperature of the converter was 1653 ℃, the C content was 0.029%, the P content was 0.009%, the S content was 0.0053%, the O content was 795ppm, and the tapping time was 423S.
The tapping temperature of the LF furnace is 1613%, the C content is 0.029%, the Mn content is 0.14%, the Si content is 0.005%, the P content is 0.007%, and the S content is 0.007%.
The RH tapping temperature is 1581 ℃, the C content is 0.0007%, the Mn content is 0.15%, the Si content is 0.003%, the Ti content is 0.07%, the P content is 0.006%, the S content is 0.007%, the ultimate vacuum degree is 112kpa, the pure degassing time is 8min, the degassing time is 27min, and the calming time is 20 min.
The finished product comprises, by mass, 0.0015% of C, 0.005% of Si, 0.15% of Mn, 0.008% of P, 0.007% of S, 0.069% of Ti, 0.032% of ALs, 0.0026% of N, O: 5 ppm.
The yield strength, tensile strength and elongation of the IF steel prepared in the embodiment are 290MPa, 345MPa and 37 percent respectively.
Example 2
Adopting a 150-ton converter to extract vanadium, carrying out composite blowing desulfurization, smelting in the 150-ton converter, LF refining, RH refining and slab continuous casting,
the temperature of the semisteel of the vanadium extraction converter is 1365 ℃, the carbon content is 3.81 percent, and the P content is 0.10 percent.
The content of S in the desulfurized molten iron is 0.0013 percent.
The tapping temperature of the converter is 1655 ℃, the C content is 0.024%, the P content is 0.002%, the S content is 0.001%, the O content is 810ppm, and the tapping time is 410S.
The tapping temperature of the LF furnace is 1618 ℃, the C content is 0.028%, the Mn content is 0.14%, the Si content is 0.005%, the P content is 0.007%, and the S content is 0.005%.
The RH tapping temperature is 1588 ℃, the C content is 0.002%, the Mn content is 0.16%, the Si content is 0.003%, the ALs Ti content is 0.07%, the P content is 0.006%, the S content is 0.007%, the ultimate vacuum degree is 85kpa, the pure degassing time is 8min, the degassing time is 31min, and the calming time is 20 min.
The finished product comprises, by mass, 0.002% of C, 0.005% of Si, 0.16% of Mn, 0.008% of P, 0.006% of S, 0.068% of Ti, 0.035% of ALs, 0.0037% of N and 3ppm of O.
The IF steel prepared in the embodiment has yield strength of 275MPa, tensile strength of 332MPa and elongation of 41 percent.
Example 3
The method comprises the steps of vanadium extraction by adopting a 150-ton converter, composite blowing desulfurization, smelting by adopting the 150-ton converter, LF refining, RH refining and slab continuous casting.
The semisteel temperature of the vanadium extraction converter is 1368 ℃, the carbon content is 3.76 percent, and the P content is 0.009 percent.
The S content of the desulfurized molten iron is 0.0020 percent.
The tapping temperature of the converter is 1655 ℃, the C content is 0.020%, the P content is 0.001%, the S content is 0.003%, the O content is 823ppm, and the tapping time is 406S.
The tapping temperature of the LF furnace is 1616 ℃, the C content is 0.026%, the Mn content is 0.16%, the Si content is 0.004%, the P content is 0.007%, and the S content is 0.003%.
The RH tapping temperature is 1583 ℃, the C content is 0.002%, the Mn content is 0.11%, the Si content is 0.003%, the Ti content is 0.065%, the P content is 0.007%, the S content is 0.004%, the ultimate vacuum degree is 132kpa, the pure degassing time is 6min, the degassing time is 22min, and the calming time is 20 min.
The finished product comprises, by mass, 0.002% of C, 0.007% of Si, 0.11% of Mn, 0.007% of P, 0.004% of S, 0.064% of Ti, 0.036% of ALs, 0.0037% of N, O: 2 ppm.
The IF steel prepared in this example had a yield strength of 263MPa, a tensile strength of 326MPa and an elongation of 46%.
Example 4
The method comprises the steps of vanadium extraction by adopting a 150-ton converter, composite blowing desulfurization, smelting by adopting the 150-ton converter, LF refining, RH refining and slab continuous casting.
The temperature of the semisteel of the vanadium extraction converter is 1366 ℃, the carbon content is 3.72 percent, and the P content is 0.08 percent.
The S content of the desulfurized molten iron is 0.0024 percent.
The tapping temperature of the converter is 1666 ℃, the C content is 0.033%, the P content is 0.007%, the S content is 0.002%, the O content is 886ppm, and the tapping time is 465S.
The tapping temperature of the LF furnace is 1615 ℃, the C content is 0.037%, the Mn content is 0.18%, the Si content is 0.007%, the P content is 0.009%, and the S content is 0.006%.
The RH tapping temperature is 1585 ℃, the C content is 0.003%, the Mn content is 0.11%, the Si content is 0.005%, the Ti content is 0.064%, the P content is 0.005%, the S content is 0.005%, the ultimate vacuum degree is 130kpa, the pure degassing time is 6min, the degassing time is 25min, and the calming time is 15 min.
The finished product comprises, by mass, 0.03% of C, 0.006% of Si, 0.12% of Mn, 0.009% of P, 0.008% of S, 0.062% of Ti, 0.031% of ALs, 0.0022% of N, O: 5 ppm.
The IF steel prepared in this example has a yield strength of 281MPa, a tensile strength of 353MPa and an elongation of 36%.
Example 5
The method comprises the steps of vanadium extraction by adopting a 150-ton converter, composite blowing desulfurization, smelting by adopting the 150-ton converter, LF refining, RH refining and slab continuous casting.
The semisteel temperature of the vanadium extraction converter is 1370 ℃, the carbon content is 3.93 percent, and the P content is 0.09 percent.
The content of S in the desulfurized molten iron is 0.0019 percent.
The tapping temperature of the converter is 1662 ℃, the C content is 0.037%, the P content is 0.005%, the S content is 0.005%, the O content is 854ppm, and the tapping time is 383S.
The tapping temperature of the LF furnace is 16120 ℃, the C content is 0.033%, the Mn content is 0.12%, the Si content is 0.006%, the P content is 0.008%, and the S content is 0.003%.
The RH tapping temperature is 1581 ℃, the C content is 0.001%, the Mn content is 0.17%, the Si content is 0.015%, the Ti content is 0.062%, the P content is 0.007%, the S content is 0.004%, the ultimate vacuum degree is 124kpa, the pure degassing time is 10min, the degassing time is 20min, and the calming time is 15 min.
The finished product comprises, by mass, 0.002% of C, 0.012% of Si, 0.0.16% of Mn, 0.009% of P, 0.005% of S, 0.061% of Ti, 0.035% of ALs, 0.0021% of N, O:3 ppm.
The IF steel prepared by the embodiment has the yield strength of 257MPa, the tensile strength of 295MPa and the elongation of 47 percent.
Example 6
The method comprises the steps of vanadium extraction by adopting a 150-ton converter, composite blowing desulfurization, smelting by adopting the 150-ton converter, LF refining, RH refining and slab continuous casting.
The temperature of the semisteel of the vanadium extraction converter is 1364 ℃, the carbon content is 3.85 percent, and the P content is 0.06 percent.
The content of S in the desulfurized molten iron is 0.0017 percent.
The tapping temperature of the converter is 1668 ℃, the C content is 0.018%, the P content is 0.009%, the S content is 0.004%, the O content is 897ppm, and the tapping time is 398S.
The tapping temperature of the LF furnace is 1617 ℃, the C content is 0.039%, the Mn content is 0.12%, the Si content is 0.009%, the P content is 0.006%, and the S content is 0.005%.
The RH tapping temperature is 1587 ℃, the C content is 0.001%, the Mn content is 0.13%, the Si content is 0.008%, the Ti content is 0.066%, the P content is 0.005%, the S content is 0.004%, the ultimate vacuum degree is 113kpa, the pure degassing time is 12min, the degassing time is 35min, and the calming time is 18 min.
The finished product comprises, by mass, 0.002% of C, 0.010% of Si, 0.13% of Mn, 0.007% of P, 0.005% of S, 0.065% of Ti, 0.037% of ALs, 0.0020% of N, O:3 ppm.
The IF steel prepared by the embodiment has yield strength of 268MPa, tensile strength of 312MPa and elongation of 45 percent.
Example 7
The method comprises the steps of vanadium extraction by adopting a 150-ton converter, composite blowing desulfurization, smelting by adopting the 150-ton converter, LF refining, RH refining and slab continuous casting.
The semisteel temperature of the vanadium extraction converter is 1368 ℃, the carbon content is 3.98 percent, and the P content is 0.07 percent.
The S content of the desulfurized molten iron is 0.0026 percent.
The tapping temperature of the converter is 1651 ℃, the C content is 0.011 percent, the P content is 0.008 percent, the S content is 0.002 percent, the O content is 708ppm, and the tapping time is 366S.
The tapping temperature of the LF furnace is 1610 ℃, the C content is 0.018%, the Mn content is 0.19%, the Si content is 0.003%, the P content is 0.006%, and the S content is 0.004%.
The RH tapping temperature is 1589 ℃, the C content is 0.002%, the Mn content is 0.20%, the Si content is 0.010%, the Ti content is 0.067%, the P content is 0.004%, the S content is 0.005%, the ultimate vacuum degree is 100kpa, the pure degassing time is 10min, the degassing time is 40min, and the calming time is 18 min.
The finished product comprises, by mass, 0.003% of C, 0.010% of Si, 0.20% of Mn, 0.005% of P, 0.005% of S, 0.066% of Ti, 0.039% of ALs, 0.0021% of N, O: 2 ppm.
The yield strength of the IF steel prepared by the embodiment is 286MPa, the tensile strength is 349MPa, and the elongation is 34%.
Example 8
The method comprises the steps of vanadium extraction by adopting a 150-ton converter, composite blowing desulfurization, smelting by adopting the 150-ton converter, LF refining, RH refining and slab continuous casting.
The semisteel temperature of the vanadium extraction converter is 1371 ℃, the carbon content is 3.83 percent, and the P content is 0.10 percent.
The S content of the desulfurized molten iron is 0.0022 percent.
The tapping temperature of the converter is 1659 ℃, the C content is 0.019%, the P content is 0.003%, the S content is 0.007%, the O content is 749ppm, and the tapping time is 474S.
The tapping temperature of the LF furnace is 1612 ℃, the C content is 0.022%, the Mn content is 0.10%, the Si content is 0.004%, the P content is 0.008%, and the S content is 0.006%.
The RH tapping temperature is 1583 ℃, the C content is 0.001%, the Mn content is 0.13%, the Si content is 0.017%, the Ti content is 0.061%, the P content is 0.005%, the S content is 0.006%, the ultimate vacuum degree is 105kpa, the pure degassing time is 7min, the degassing time is 38min, and the calming time is 18 min.
The finished product comprises, by mass, 0.002% of C, 0.017% of Si, 0.13% of Mn, 0.005% of P, 0.007% of S, 0.061% of Ti, 0.037% of ALs, 0.0024% of N, O: 5 ppm.
The IF steel prepared in the embodiment has yield strength of 273MPa, tensile strength of 249MPa and elongation of 39%.
The above-mentioned embodiments are further described in detail for the purpose of illustrating the invention, the technical solutions and the advantages, it should be understood that the above-mentioned embodiments are only preferred embodiments of the invention, and are not intended to limit the spirit and the principle of the invention, and any modifications, equivalent substitutions, improvements and the like should be included in the protection scope of the invention.

Claims (10)

1. A method for producing IF steel by using vanadium-extracted semisteel is characterized by comprising the following steps: vanadium extraction from molten iron → semisteel desulfurization → converter smelting → LF refining → RH refining → continuous casting.
2. The method for producing the IF steel by using the vanadium extraction semisteel as claimed in claim 1, wherein the semisteel after molten iron vanadium extraction is as follows: t is more than 1360 ℃, C is more than or equal to 3.7 percent and less than or equal to 4.0 percent, and P is less than or equal to 0.11 percent.
3. The method for producing IF steel from vanadium-extracted semisteel according to claim 1 or 2, wherein the blowing temperature is controlled between 1300 ℃ and 1400 ℃ during the vanadium extraction from the molten iron, the crushing material is added during the blowing process to perform the first dephosphorization, and a proper amount of aluminum, silicomanganese and silicon iron is added to perform the oxidation adjustment on the semisteel.
4. The method for producing IF steel by using the semi-steel extracted with vanadium as claimed in claim 1, wherein S is less than or equal to 0.003% after the semi-steel is desulfurized.
5. The method for producing IF steel using vanadium-extracted semisteel according to claim 1, wherein the converter smelting tapping molten steel: t is more than or equal to 1650 ℃ and less than or equal to 1670 ℃, C is more than or equal to 0 and less than or equal to 0.04%, P is less than or equal to 0.010%, S is less than or equal to 0.008%, the end point oxygen content is 700-900ppm, and the tapping time is 6-8 min.
6. The method for producing IF steel from vanadium-extracted semisteel according to claim 5, wherein the converter end point oxygen control is performed using a low nitrogen carburant when the end point oxygen exceeds 900 ppm.
7. The method for producing IF steel from vanadium-extracting semisteel as claimed in claim 1, wherein the molten steel after LF refining has a temperature of 1610 ℃ to T1620 ℃, 0 to C0.04%, 0.10% to Mn 0.20%, 0 to Si 0.01%, P0.010%, and S0.008%.
8. The method for producing IF steel by using vanadium-extracted semisteel according to claim 1 or 7, characterized in that the adjustment and heat supplementation of the manganese content of steel grade are performed by adding medium carbon ferromanganese in the LF refining process.
9. The method for producing IF steel from vanadium-extracted semisteel according to claim 1, wherein in the RH refining process: limiting vacuum degree not higher than 300kpa, pure degassing time of 6-12min, exhaust time of 20-40min, and sedation time of 15-20 min; molten steel from RH refining: t is more than or equal to 1580 ℃ and less than or equal to 1590 ℃, C is more than or equal to 0 and less than or equal to 0.003 percent, Mn is more than or equal to 0.10 and less than or equal to 0.20 percent, Si is more than or equal to 0 and less than or equal to 0.02 percent, Ti is more than or equal to 0.060 percent and less than or equal to 0.070 percent, P is less than or equal to 0.010 percent, S is less than or equal to 0.007 percent, N is less than or equal to 0.0030 percent and O is less than or equal to 10 ppm.
10. The method for producing the IF steel by using the vanadium-extracted semisteel according to claim 1, wherein the IF steel comprises the following chemical components in percentage by mass: less than or equal to 0.004%, less than or equal to 0.03%, Mn: 0.10-0.20%, P is less than or equal to 0.012%, S is less than or equal to 0.008%, Ti: 0.055-0.070%, ALs: 0.020-0.045%, N is less than or equal to 0.0040%, and O is less than or equal to 10 ppm; the balance of Fe and inevitable impurities.
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