CN111041148B - Process for continuously casting straight-up medium-thin slab of low-sulfur-content medium-carbon structural steel converter - Google Patents

Process for continuously casting straight-up medium-thin slab of low-sulfur-content medium-carbon structural steel converter Download PDF

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CN111041148B
CN111041148B CN201911295945.XA CN201911295945A CN111041148B CN 111041148 B CN111041148 B CN 111041148B CN 201911295945 A CN201911295945 A CN 201911295945A CN 111041148 B CN111041148 B CN 111041148B
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steel
ladle
medium
equal
converter
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CN111041148A (en
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杨杰
吴振刚
李军明
张军国
单庆林
张响
王占国
张涛
梁娟
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Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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    • 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
    • C21C5/30—Regulating or controlling the blowing
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • C21C1/025—Agents used for 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
    • C21C5/36—Processes yielding slags of special composition
    • 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
    • C21C7/0645—Agents used for dephosphorising or desulfurising

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses a process for continuously casting a straight upper middle thin slab and a middle thin slab of a low-sulfur-content medium carbon structural steel converter, wherein a magnesium powder blowing process is used for molten iron pretreatment, 3-7 kg of lime powder per ton of steel is added into an iron ladle in advance, and the components at the end point of the converter are controlled as follows: c is more than or equal to 0.06 percent, S is less than or equal to 0.012 percent, P is less than or equal to 0.022 percent, and the end point temperature is 1670-1680 ℃; in the tapping process, ferrosilicon is used for deoxidation and silicon preparation, high-carbon ferromanganese is used for manganese preparation, and the reasonable feeding sequence and the argon stirring strength of a steel ladle are controlled, so that the final S of molten steel is less than or equal to 0.008 percent; controlling the continuous casting drawing speed to be 1.6-1.8 m/min, and controlling the flow of argon to be 3-6L/min by using an argon blowing stopper rod and an argon blowing water feeding port. The invention realizes the process of continuously casting the medium and thin slab by blowing argon in the low-sulfur medium carbon structural steel converter, solves the technical problems of the nozzle nodulation and the product surface defect of the medium and thin slab continuous casting in the process of pouring the converter straight process, and the produced product has good quality and meets the standard and the use requirement of users.

Description

Process for continuously casting straight-up medium-thin slab of low-sulfur-content medium-carbon structural steel converter
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a process for continuously casting a straight-up medium and thin slab of a low-sulfur-content medium carbon structural steel converter.
Background
The converter molten steel does not pass through an LF refining direct-upward continuous casting process, so that the energy consumption and the cost of steelmaking can be greatly reduced. In the conventional slab process, a converter-direct continuous casting process of molten steel is frequently reported, and after the molten steel is subjected to desulfurization treatment, a CAS (CAS) treatment station or after-furnace argon blowing is adopted by most of domestic enterprises and European enterprises to directly supply the molten steel for continuous casting of conventional slabs. The units such as moving steel and the like adopt a CAS treatment station to smelt aluminum killed steel, molten steel is hoisted to the CAS treatment station after the converter taps steel, and alloying and argon blowing stirring are completed under a vacuum cover for continuous casting; adding a steel slag modifier after the furnace, stirring, statically blowing and directly supplying for continuous casting of a conventional plate blank; the steel is not deoxidized when steel is tapped by a converter in Wu-Steel-two steelmaking unit, Tangshan Jianlong unit and other units, and the steel is alloyed by an aluminum wire after being smelted, stirred and statically blown to be directly used for continuous casting of conventional slabs.
For the converter direct-up continuous casting process, the main factors restricting the production and the quality are molten steel temperature control, molten steel composition control, molten steel castability control, surface quality and the like. Wherein, because of no LF slagging function and calcium treatment process, the castability of molten steel and the surface quality of casting blank are restrictive links.
Compared with the conventional slab process, the medium and thin slab process has the advantages that the thickness of the crystallizer is small, the pulling speed is relatively high due to the adoption of the flat water gap, the nodulation tendency of the water gap is increased, the turbulence degree and the heat transfer nonuniformity in the crystallizer are remarkably enhanced, so that the casting blank is easy to have the defects of longitudinal cracking and the like, the sulfur content of molten steel is controlled to be below 0.008% for the medium and thin slab process, the longitudinal cracking of the casting blank can be effectively controlled, the casting performance and molten steel component control requirements of the molten steel are higher for the medium and thin slab process, and the process difficulty on converter straightening is higher. At present, molten steel in the domestic and overseas medium-thin plate process needs to be refined to ensure smooth pouring and the quality of final products, for example, saddle steel, medium steel and the like adopt a converter-LF refining furnace-medium-thin plate billet continuous casting process flow to produce related steel grades, and desulfurization and calcium treatment are completed through the LF refining furnace to ensure the components and the castability of the molten steel, but the process has high energy consumption, serious corrosion of steel ladle refractory materials, calcium treatment of the molten steel and high alloy consumption.
Therefore, the process for continuously casting the straight-up middle thin slab of the converter for producing the low-sulfur-content medium-carbon structural steel is developed, refined slag and alloy are added in the tapping process of the converter for slag washing and deoxidation alloying, an argon blowing system behind the converter is utilized, argon flow is controlled in stages to carry out argon blowing stirring, desulfurization, deoxidation and inclusion floating are promoted, the sulfur content of molten steel is reduced to be below 0.008%, the castability of the molten steel is ensured, and the continuous casting of the straight-up middle thin slab in an LF refining process is further omitted, so that the process has great significance for further reducing the production cost and improving the production efficiency, and meanwhile, the process for producing the low-sulfur-content steel in the straight-up middle thin slab continuous casting mode of the converter is a new attempt and a new process. Compared with a refining process, the method can reduce the cost by 10-12 yuan/t steel, has no nozzle nodulation phenomenon in continuous casting, and produces the final product with good quality and the qualification rate of 99.98 percent.
Disclosure of Invention
The invention aims to solve the technical problem of providing a process for continuously casting straight-up medium and thin slabs of a low-sulfur-content medium carbon structural steel converter. The invention solves the problems that the continuous casting can not be carried out due to the fact that the nozzle is nodulated when the medium carbon structural steel converter is directly continuously cast, and the product quality can not meet the requirements.
In order to solve the technical problems, the invention adopts the technical scheme that: a process for continuously casting a straight-up medium-thin slab of a low-sulfur-content medium-carbon structural steel converter comprises the following steps:
(1) a molten iron pretreatment process: the temperature of molten iron before treatment is more than or equal to 1250 ℃, and S is less than or equal to 0.035%; by using a magnesium powder blowing process, 3-7 kg of lime powder per ton of steel is added into the ladle in advance, and the lime is required to contain more than or equal to 88% of CaO, less than or equal to 5% of MgO,SiO2Less than or equal to 1.5 percent, less than or equal to 0.05 percent of S, more than or equal to 350ml of activity and 1-5 mm of granularity. S in the desulfurized molten iron is less than or equal to 0.010 percent, and the desulfurized iron slag is removed;
(2) a converter smelting process:
A. the steel ladle requires continuous use of a red ladle, the placement of the first three furnaces and the furnace separating ladle of the size repair and standby ladle is forbidden, and the time from continuous casting stop to converter tapping is less than or equal to 60min for the used steel ladle;
B. the smelting period of the converter is 25-28 min from the beginning of iron loading to the end of steel tapping; the argon blowing treatment period is 11-14 min; the hoisting period is 5-8 min; the time to be watered is less than or equal to 5 min; the steel casting period of continuous casting is 45-55 min;
C. the composition of the converter endpoint components is controlled as follows: c is more than or equal to 0.06 percent, S is less than or equal to 0.012 percent, and P is less than or equal to 0.022 percent; the end point temperature is 1670-1680 ℃; the deoxidation alloying charging sequence is as follows: concise slag charge, lime, carbon powder, high carbon ferromanganese, ferrosilicon, steel sand aluminium, the tapping begins 1 ~ 1.5min and adds concise slag charge and lime, and the big argon gas volume of 1000 ~ 1200L/min of feeding process stirs, uses ferrosilicon deoxidization, joins in marriage silicon, and manganese is joined in marriage to high carbon ferromanganese, controls bale Mn: 0.25-0.40%; double-baffle tapping is carried out by using a sliding plate to baffle slag and a slag-baffle cone; ladle operation: after tapping, driving the steel ladle to a temperature measuring and sampling position, and stirring for 5-6 min by adopting high-strength argon during tapping, wherein the flow of the argon is 1000-1200L/min; after steel is discharged, stirring with medium-strength argon for 3-4 min, wherein the argon flow is 500-700L/min, then sampling, and then converting into weak argon blowing for 8-10 min, wherein the argon flow is 100-200L/min, and the temperature of the converter bale after stirring is controlled to be 1585-1595 ℃;
(3) and (3) continuous casting process: controlling the continuous casting drawing speed of the last furnace to be 1.6-1.8 m/min, controlling the target drawing speed to be 1.7m/min, controlling the temperature of the tundish to be 1535-1555 ℃, using an argon blowing stopper rod and an argon blowing water feeding port, controlling the flow of argon to be 3-6L/min, and controlling the back pressure to be more than or equal to 0.01 MPa.
The converter smelting of the invention, the post-refining final slag component control is as follows: CaO: 45-50% of Al2O3：20～25%、SiO2: 10-15%, FeO + MnO less than or equal to 1.5%, Al powder: 4 to 6 percent of CaO/Al2O3: 1.7-2.2, adjusting the melting point to 1450-1550 ℃ by adding 0.6-1.5 kg of fluorite per t of steel, and adjusting the sulfur content in the ladle slagThe ratio of the sulfur content to the sulfur content of the molten steel in the ladle, namely the sulfur content ratio, is 40-65.
The thickness of the medium and thin slab continuous casting crystallizer is 150-180 mm.
The thickness specification of the medium and thin slab is 150-180 mm.
The medium carbon structural steel ladle comprises the following chemical components in percentage by mass: c: 0.16-0.22%, Si: 0.12 to 0.25%, Mn: 0.25-0.40%, S is less than or equal to 0.008%, P is less than or equal to 0.025%, and the balance is Fe and inevitable impurities.
The medium carbon structural steel comprises the following chemical components in percentage by mass: c: 0.16-0.22%, Si: 0.12 to 0.25%, Mn: 0.25-0.40%, S is less than or equal to 0.008%, P is less than or equal to 0.025%, and the balance is Fe and inevitable impurities.
The oxygen content of molten steel of the continuous casting tundish in the process is 0.0026-0.0032%, the desulfurization capacity of final slag of the ladle reaches 31.8-42.9%, and the sulfur content of a finished product is controlled at 0.006-0.008%.
Compared with a refining process, the process can reduce the cost by 10-12 yuan/t steel, has no nozzle nodulation phenomenon in continuous casting, and produces a final product with good quality.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the oxygen content of molten steel of the tundish in the continuous casting process is 0.0026-0.0032%, the desulfurization capacity of final slag of the ladle reaches 31.8-42.9%, and the sulfur content of a finished product is controlled at 0.006-0.008%. 2. The invention realizes the process of continuously casting the medium-carbon structural steel by directly blowing argon into the medium-carbon structural steel converter, solves the technical problems of the accretion of a thin slab continuous casting water gap and the surface defects of a product in the pouring process of the converter directly-on process, can reduce the cost by 10-12 yuan/t steel compared with a refining process, has good quality of the obtained product, and meets the standard and the use requirement of a user.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The process for continuously casting the medium-thin plate blank directly on the medium carbon structural steel converter in the embodiment comprises the following steps:
(1) a molten iron pretreatment process: the temperature of molten iron before treatment is more than or equal to 1250 ℃, and S is less than or equal to0.035%; by using a magnesium powder injection process, 3-7 kg of lime powder per t of steel is added into the iron ladle in advance, S in the desulfurized molten iron is less than or equal to 0.010%, and the desulfurized iron slag is completely removed; the lime powder can be undersize of lime for converter smelting, and the particle size is 1-5 mm. The lime is required to contain more than or equal to 88 percent of CaO, less than or equal to 5 percent of MgO and SiO2Less than or equal to 1.5 percent, less than or equal to 0.05 percent of S and more than or equal to 350ml of activity.
(2) A converter smelting process:
A. the steel ladle requires continuous use of a red ladle, the placement of the first three furnaces and the furnace separating ladle of the size repair and standby ladle is forbidden, and the time from continuous casting stop to converter tapping is less than or equal to 60min for the used steel ladle;
B. the smelting period of the converter is 25-28 min from the beginning of iron loading to the end of steel tapping; the argon blowing treatment period is 11-14 min; the hoisting period is 5-8 min; the time to be watered is less than or equal to 5 min; the steel casting period of continuous casting is 45-55 min;
C. the composition of the converter endpoint components is controlled as follows: c is more than or equal to 0.06 percent, S is less than or equal to 0.012 percent, and P is less than or equal to 0.022 percent; the end point temperature is 1670-1680 ℃; the deoxidation alloying charging sequence is as follows: concise slag charge, lime, carbon powder, high carbon ferromanganese, ferrosilicon, steel sand aluminium, the tapping begins 1 ~ 1.5min and adds concise slag charge and lime, and the big argon gas volume of 1000 ~ 1200L/min of feeding process stirs, uses ferrosilicon deoxidization, joins in marriage silicon, and manganese is joined in marriage to high carbon ferromanganese, controls bale Mn: 0.25-0.40%; double-baffle tapping is carried out by using a sliding plate to baffle slag and a slag-baffle cone; ladle operation: after tapping, driving a steel ladle to a temperature measuring and sampling position, stirring by using high-strength argon gas (the flow rate is 1000-1200L/min) for 5-6 min during tapping, stirring by using medium-strength argon gas (the flow rate is 500-700L/min) for 3-4 min after tapping, sampling, converting into weak argon blowing (the flow rate is 100-200L/min) for 8-10 min, and controlling the temperature to be 1585-1595 ℃ after stirring by using a converter ladle; the chemical composition and the mass percentage content of the medium carbon structural steel ladle are shown in table 1; the composition of the final slag of the post-refining furnace is controlled as follows: CaO: 45-50% of Al2O3：20～25%、SiO2: 10-15%, FeO + MnO less than or equal to 1.5%, Al powder: 4 to 6 percent of CaO/Al2O3: 1.7-2.2, adjusting the melting point to 1450-1550 ℃ by adding 0.6-1.5 kg of fluorite per t of steel, and adjusting the sulfur content ratio to 40-65;
(3) and (3) continuous casting process: the thickness of the middle thin slab continuous casting crystallizer is 150-180 mm, the continuous casting speed of the last furnace is controlled to be 1.6-1.8 m/min, the target casting speed is 1.7m/min, the temperature of the middle ladle is controlled to be 1535-1555 ℃, an argon blowing stopper rod and an argon blowing water feeding port are used, the flow rate of argon is controlled to be 3-6L/min, and the pressure for preparation is more than or equal to 0.01 MPa.
The thickness specification of the thin slab in the embodiment is 150-180 mm, and the chemical composition and the mass percentage of the thin slab are shown in table 2;
the oxygen content of molten steel of the continuous casting tundish in the process is 0.0026-0.0032%, the desulfurization capacity of final slag of the ladle reaches 31.8-42.9%, and the sulfur content of a finished product is controlled at 0.006-0.008%.
Example 1
The process for continuously casting the medium-thin plate blank directly on the medium carbon structural steel converter in the embodiment comprises the following steps:
(1) a molten iron pretreatment process: the temperature of molten iron before treatment is 1270 ℃, S: 0.032%; by using a magnesium powder blowing process, 4 kg of lime powder per t of steel is added into the ladle in advance, and the molten iron after desulfurization contains S: 0.009%, completely removing the desulfurized iron slag;
(2) a converter smelting process:
A. the steel ladle requires continuous use of a red ladle, the placement of three furnaces and a furnace separating ladle before size modification and standby ladle is forbidden, and the used steel ladle stops casting from continuous casting until the tapping time of the converter is 50 min;
B. the smelting period of the converter is 27min from the beginning of iron loading to the end of steel tapping; argon blowing treatment period is 13 min; the hoisting period is 7 min; waiting for pouring for 3 min; the steel casting period of continuous casting is 50 min;
C. the composition of the converter endpoint components is controlled as follows: c: 0.08%, S: 0.011%, P: 0.018%; the end point temperature is 1672 ℃; the deoxidation alloying charging sequence is as follows: concise slag charge, lime, carbon powder, high carbon ferromanganese, ferrosilicon, steel sand aluminium, the tapping begins to add concise slag charge and lime 1.1min, and the big argon gas volume of charging process 1050L/min stirs, uses ferrosilicon deoxidation, joins in marriage silicon, and manganese is joined in marriage to high carbon ferromanganese, controls bale Mn: 0.27 percent; double-baffle tapping is carried out by using a sliding plate to baffle slag and a slag-baffle cone; ladle operation: tapping steel ladle, stirring with high-intensity argon (flow rate of 1050L/min) for 5min, stirring with medium-intensity argon (flow rate of 600L/min) for 4min, and taking outSampling, then converting to weak argon blowing (flow rate of 150L/min) for 9min, and controlling the temperature to 1590 ℃ after the converter ladle is stirred; the chemical composition and the mass percentage content of the medium carbon structural steel ladle are shown in table 1; the composition of the final slag of the post-refining furnace is controlled as follows: CaO: 48% of Al2O3：22%、SiO2: 13%, FeO + MnO: 1.4%, Al powder: 5% CaO/Al2O3: 2.1, adjusting the melting point to 1490 ℃ by adding 1.1 kg of fireflies per ton of steel, and adjusting the sulfur content ratio to 49;
(3) and (3) continuous casting process: the thickness of the middle thin slab continuous casting crystallizer is 150mm, the continuous casting drawing speed of the last furnace is controlled to be 1.7m/min, the temperature of the middle ladle is controlled to be 1540 ℃, an argon blowing stopper rod and an argon blowing water feeding port are used, the argon flow is controlled to be 3L/min, and the standby pressure is 0.02 MPa.
The thickness specification of the thin slab in the embodiment is 150mm, and the chemical composition and the mass percentage of the thin slab are shown in table 2;
the oxygen content of molten steel in the tundish in the process of continuous casting is 0.0027 percent, the desulfurization capacity of final slag of the ladle reaches 36.4 percent, and the sulfur content of a finished product is controlled to be 0.007 percent.
Example 2
The process for continuously casting the medium-thin plate blank directly on the medium carbon structural steel converter in the embodiment comprises the following steps:
(1) a molten iron pretreatment process: the temperature of molten iron before treatment is 1265 ℃, S: 0.030%; by using a magnesium powder blowing process, 6 kg of lime powder per t of steel is added into the ladle in advance, and the molten iron after desulfurization contains S: 0.007 percent, completely removing the desulfurized iron slag;
(2) a converter smelting process:
A. the steel ladle requires continuous use of a red ladle, the placement of three furnaces and a furnace separating ladle before size modification and standby ladle is forbidden, and the time from continuous casting stop to converter tapping is 45min for the used steel ladle;
B. the smelting period of the converter is 26min from the beginning of iron loading to the end of steel tapping; argon blowing treatment period is 11 min; the hoisting period is 6 min; waiting for pouring for 4 min; the steel casting period of continuous casting is 47 min;
C. the composition of the converter endpoint components is controlled as follows: c: 0.07%, S: 0.010%, P: 0.020%; the end point temperature is 1677 ℃; the deoxidation alloying charging sequence is as follows: refining slag, lime and carbonPowder, high carbon ferromanganese, ferrosilicon, steel sand aluminium, tapping begins to add refined slag charge and lime 1.2min, and the big argon gas volume of charging process 1000L/min stirs, uses ferrosilicon deoxidation, joins in marriage silicon, and manganese is joined in marriage to high carbon ferromanganese, controls bale Mn: 0.33 percent; double-baffle tapping is carried out by using a sliding plate to baffle slag and a slag-baffle cone; ladle operation: tapping the steel ladle to a temperature measuring and sampling position after tapping, stirring by adopting high-intensity argon gas (the flow rate is 1000L/min) for 6min during tapping, stirring by adopting medium-intensity argon gas (the flow rate is 700L/min) for 3min after tapping, sampling, converting into weak argon gas blowing (the flow rate is 160L/min) for 8min, and controlling the temperature to be 1587 ℃ after stirring by the converter ladle; the chemical composition and the mass percentage content of the medium carbon structural steel ladle are shown in table 1; the composition of the final slag of the post-refining furnace is controlled as follows: CaO: 48% of Al2O3：21%、SiO2: 11%, FeO + MnO: 1.2%, Al powder: 6% CaO/Al2O3: 1.8, adjusting the melting point to 1530 ℃ by adding 0.8 kg of fluorite per t of steel, and controlling the sulfur content ratio to 57;
(3) and (3) continuous casting process: the thickness of the middle thin slab continuous casting crystallizer is 170mm, the continuous casting drawing speed of the last furnace is controlled to be 1.6m/min, the temperature of the middle ladle is controlled to be 1546 ℃, an argon blowing stopper rod and an argon blowing water feeding port are used, the flow rate of argon is controlled to be 5L/min, and the back pressure is 0.05 MPa.
The thickness specification of the thin slab in the embodiment is 170mm, and the chemical composition and the mass percentage of the thin slab are shown in table 2;
the oxygen content of molten steel in the continuous casting tundish in the process is 0.0030 percent, the desulfurization capacity of final slag of the ladle reaches 40 percent, and the sulfur content of a finished product is controlled to be 0.006 percent.
Example 3
The process for continuously casting the medium-thin plate blank directly on the medium carbon structural steel converter in the embodiment comprises the following steps:
(1) a molten iron pretreatment process: the temperature of molten iron before treatment is 1280 ℃, S: 0.025 percent; by using a magnesium powder blowing process, 3 kg of lime powder per t of steel is added into the ladle in advance, and the molten iron after desulfurization contains S: 0.006 percent, completely removing the desulfurized iron slag;
(2) a converter smelting process:
A. the steel ladle requires continuous use of a red ladle, the placement of three furnaces and a furnace separating ladle before size modification and standby ladle is forbidden, and the time from continuous casting stop to converter tapping is 54min for the used steel ladle;
B. the smelting period of the converter is 26min from the beginning of iron loading to the end of steel tapping; argon blowing treatment period is 12 min; the hoisting period is 5 min; waiting for pouring for 5 min; the continuous casting steel casting period is 48 min;
C. the composition of the converter endpoint components is controlled as follows: c: 0.075%, S: 0.009%, P: 0.021%; the end point temperature is 1675 ℃; the deoxidation alloying charging sequence is as follows: concise slag charge, lime, carbon powder, high carbon ferromanganese, ferrosilicon, steel sand aluminium, the tapping begins to add concise slag charge and lime 1.3min, and the big argon gas volume of charging process 1100L/min stirs, uses ferrosilicon deoxidation, joins in marriage silicon, and manganese is joined in marriage to high carbon ferromanganese, controls bale Mn: 0.30 percent; double-baffle tapping is carried out by using a sliding plate to baffle slag and a slag-baffle cone; ladle operation: after tapping, driving a steel ladle to a temperature measuring and sampling position, stirring by adopting high-intensity argon gas (the flow rate is 1100L/min) for 6min during tapping, stirring by adopting medium-intensity argon gas (the flow rate is 550L/min) for 3min after tapping, sampling, converting into weak argon gas blowing (the flow rate is 120L/min) for 9min, and controlling the temperature to be 1592 ℃ after stirring of a converter ladle; the chemical composition and the mass percentage content of the medium carbon structural steel ladle are shown in table 1; the composition of the final slag of the post-refining furnace is controlled as follows: CaO: 49% of Al2O3：24%、SiO2: 12%, FeO + MnO: 1.0%, Al powder: 5.5%, CaO/Al2O3: 2.0, adjusting the melting point to 1500 ℃ by adding 1.0 kg of fluorite per t of steel, and the sulfur content ratio is 62;
(3) and (3) continuous casting process: the thickness of the middle thin slab continuous casting crystallizer is 160mm, the continuous casting drawing speed of the last furnace is controlled to be 1.7m/min, the temperature of the middle ladle is controlled to be 1551 ℃, an argon blowing stopper rod and an argon blowing water feeding port are used, the flow rate of argon is controlled to be 6L/min, and the back pressure is 0.03 MPa.
The thickness specification of the thin slab in the embodiment is 160mm, and the chemical composition and the mass percentage of the thin slab are shown in table 2;
the oxygen content of molten steel in the tundish in the continuous casting process is 0.0029 percent, the desulfurization capacity of the final slag of the ladle reaches 33.3 percent, and the sulfur content of a finished product is controlled to be 0.006 percent.
Example 4
The process for continuously casting the medium-thin plate blank directly on the medium carbon structural steel converter in the embodiment comprises the following steps:
(1) a molten iron pretreatment process: the temperature of molten iron before treatment is 1275 ℃, S: 0.030%; by using a magnesium powder blowing process, adding 7 kg of lime powder per t of steel into the ladle in advance, and adding S in the desulfurized molten iron: 0.008 percent, completely removing the desulfurized iron slag;
(2) a converter smelting process:
A. the steel ladle requires continuous use of a red ladle, the placement of three furnaces and a furnace separating ladle before size modification and standby ladle is forbidden, and the used steel ladle stops casting from continuous casting until the tapping time of the converter is 59 min;
B. the smelting period of the converter is 26min from the beginning of iron loading to the end of steel tapping; argon blowing treatment period is 11 min; the hoisting period is 5 min; waiting for pouring for 3 min; the steel casting period of continuous casting is 45 min;
C. the composition of the converter endpoint components is controlled as follows: c: 0.065%, S: 0.011%, P: 0.017 percent; the end point temperature is 1679 ℃; the deoxidation alloying charging sequence is as follows: concise slag charge, lime, carbon powder, high carbon ferromanganese, ferrosilicon, steel sand aluminium, tapping begin 1min and add concise slag charge and lime, the big argon gas volume of charging process 1200L/min stirs, uses ferrosilicon deoxidization, joins in marriage silicon, and manganese is joined in marriage to high carbon ferromanganese, controls bale Mn: 0.29 percent; double-baffle tapping is carried out by using a sliding plate to baffle slag and a slag-baffle cone; ladle operation: tapping the steel ladle to a temperature measuring and sampling position after tapping, stirring for 5min by adopting high-intensity argon (with the flow rate of 1200L/min) during tapping, stirring for 3min by adopting medium-intensity argon (with the flow rate of 500L/min) after tapping, sampling, converting into weak argon blowing (with the flow rate of 200L/min) for 8min, and controlling the temperature to be 1588 ℃ after stirring of the converter ladle; the chemical composition and the mass percentage content of the medium carbon structural steel ladle are shown in table 1; the composition of the final slag of the post-refining furnace is controlled as follows: CaO: 47% of Al2O3：23%、SiO2: 14%, FeO + MnO: 1.1%, Al powder: 6% CaO/Al2O3: 1.9, adjusting the melting point to 1520 ℃ by adding 0.9 kg of fluorite per t of steel, and adjusting the sulfur content ratio to 60;
(3) and (3) continuous casting process: the thickness of the middle thin slab continuous casting crystallizer is 180mm, the continuous casting drawing speed of the last furnace is controlled to be 1.6m/min, the temperature of the middle ladle is controlled to be 1542 ℃, an argon blowing stopper rod and an argon blowing water feeding port are used, the flow rate of argon is controlled to be 5L/min, and the back pressure is 0.04 MPa.
The thickness specification of the thin slab in the embodiment is 180mm, and the chemical composition and the mass percentage of the thin slab are shown in table 2;
the oxygen content of molten steel in the continuous casting tundish in the process is 0.0032 percent, the desulfurization capacity of the final slag of the ladle reaches 31.8 percent, and the sulfur content of a finished product is controlled to be 0.0075 percent.
Example 5
The process for continuously casting the medium-thin plate blank directly on the medium carbon structural steel converter in the embodiment comprises the following steps:
(1) a molten iron pretreatment process: the temperature of molten iron before treatment is 1255 ℃, S: 0.033%; by using a magnesium powder blowing process, 6 kg of lime powder per t of steel is added into the ladle in advance, and the molten iron after desulfurization contains S: 0.010 percent, completely removing the desulfurized iron slag;
(2) a converter smelting process:
A. the steel ladle requires continuous use of a red ladle, the placement of three furnaces and a furnace separating ladle before size modification and standby ladle is forbidden, and the used steel ladle stops casting from continuous casting until the tapping time of the converter is 48 min;
B. the smelting period of the converter is 27min from the beginning of iron loading to the end of steel tapping; argon blowing treatment period is 13 min; the hoisting period is 7 min; waiting for pouring for 2.5 min; the continuous casting steel casting period is 49 min;
C. the composition of the converter endpoint components is controlled as follows: c: 0.063%, S: 0.012%, P: 0.019%; the end point temperature is 1673 ℃; the deoxidation alloying charging sequence is as follows: concise slag charge, lime, carbon powder, high carbon ferromanganese, ferrosilicon, steel sand aluminium, the tapping begins to add concise slag charge and lime 1.5min, and the big argon gas volume of reinforced process 1070L/min stirs, uses ferrosilicon deoxidization, joins in marriage silicon, and manganese is joined in marriage to high carbon ferromanganese, controls bale Mn: 0.35 percent; double-baffle tapping is carried out by using a sliding plate to baffle slag and a slag-baffle cone; ladle operation: after tapping, driving a steel ladle to a temperature measuring and sampling position, stirring by adopting high-strength argon gas (the flow rate is 1070L/min) for 6min during tapping, stirring by adopting medium-strength argon gas (the flow rate is 500L/min) for 3min after tapping, sampling, converting into weak argon blowing (the flow rate is 150L/min) for 9min, and controlling the temperature to be 1594 ℃ after stirring of a converter ladle; the chemical composition and the mass percentage content of the medium carbon structural steel ladle are shown in table 1; the composition of the final slag of the post-refining furnace is controlled as follows: CaO: 46% of Al2O3：24%、SiO2: 11%, FeO + MnO: 1.3%, Al powder: 4% CaO/Al2O3: 1.8, adjusting the melting point to 1460 ℃ by adding 1.4 kg of fluorite per t of steel, and adjusting the sulfur component ratio to 55;
(3) and (3) continuous casting process: the thickness of the middle thin slab continuous casting crystallizer is 150mm, the continuous casting drawing speed of the last furnace is controlled to be 1.8m/min, the temperature of the middle ladle is controlled to be 1548 ℃, an argon blowing stopper rod and an argon blowing water feeding port are used, the flow rate of argon is controlled to be 3L/min, and the back pressure is 0.03 MPa.
The thickness specification of the thin slab in the embodiment is 150mm, and the chemical composition and the mass percentage of the thin slab are shown in table 2;
the oxygen content of molten steel in the continuous casting tundish in the process is 0.0028 percent, the desulfurization capacity of the final slag of the ladle reaches 33.3 percent, and the sulfur content of a finished product is controlled at 0.008 percent.
Example 6
The process for continuously casting the medium-thin plate blank directly on the medium carbon structural steel converter in the embodiment comprises the following steps:
(1) a molten iron pretreatment process: the temperature of molten iron before treatment is 1270 ℃, S: 0.031%; by using a magnesium powder blowing process, adding 7 kg of lime powder per t of steel into the ladle in advance, and adding S in the desulfurized molten iron: 0.006 percent, completely removing the desulfurized iron slag;
(2) a converter smelting process:
A. the steel ladle requires continuous use of a red ladle, the placement of three furnaces and a furnace separating ladle before size modification and standby ladle is forbidden, and the used steel ladle stops casting from continuous casting until the tapping time of the converter is 52 min;
B. the smelting period of the converter is 28min from the beginning of iron loading to the end of steel tapping; the argon blowing treatment period is 12.5 min; the hoisting period is 8 min; waiting for pouring for 4 min; the continuous casting steel casting period is 51 min;
C. the composition of the converter endpoint components is controlled as follows: c: 0.077%, S: 0.0105%, P: 0.016 percent; the end point temperature is 1678 ℃; the deoxidation alloying charging sequence is as follows: concise slag charge, lime, carbon powder, high carbon ferromanganese, ferrosilicon, steel sand aluminium, the tapping begins to add concise slag charge and lime 1.4min, and the big argon gas volume of feeding process 1180L/min stirs, uses ferrosilicon deoxidization, joins in marriage silicon, and manganese is joined in marriage to high carbon ferromanganese, controls bale Mn: 0.38 percent; double-baffle steel tapping by using sliding plate to baffle slag and baffle slag cone(ii) a Ladle operation: tapping the steel ladle to a temperature measuring and sampling position after tapping, stirring by adopting high-strength argon gas (the flow rate is 1180L/min) for 6min during tapping, stirring by adopting medium-strength argon gas (the flow rate is 650L/min) for 4min after tapping, sampling, converting into weak argon gas blowing (the flow rate is 200L/min) for 8min, and controlling the temperature to be 1589 ℃ after stirring by a converter ladle; the chemical composition and the mass percentage content of the medium carbon structural steel ladle are shown in table 1; the composition of the final slag of the post-refining furnace is controlled as follows: CaO: 49% of Al2O3：21%、SiO2: 13%, FeO + MnO: 1.2%, Al powder: 5% CaO/Al2O3: 2.0, adjusting the melting point to 1470 ℃ by adding 1.3 kg of fluorite per t of steel, and the sulfur content ratio is 59;
(3) and (3) continuous casting process: the thickness of the middle thin slab continuous casting crystallizer is 160mm, the continuous casting drawing speed of the last furnace is controlled to be 1.65m/min, the temperature of the middle ladle is controlled to be 1538 ℃, an argon blowing stopper rod and an argon blowing water feeding port are used, the flow rate of argon is controlled to be 5L/min, and the back pressure is 0.03 MPa.
The thickness specification of the thin slab in the embodiment is 160mm, and the chemical composition and the mass percentage of the thin slab are shown in table 2;
the oxygen content of molten steel in the tundish in the continuous casting process is 0.0026 percent, the desulfurization capacity of the final slag of the ladle reaches 42.9 percent, and the sulfur content of a finished product is controlled to be 0.006 percent.
Example 7
The process for continuously casting the medium-thin plate blank directly on the medium carbon structural steel converter in the embodiment comprises the following steps:
(1) a molten iron pretreatment process: the temperature of molten iron before treatment is 1250 ℃, S: 0.027%; by using a magnesium powder blowing process, 5 kg of lime powder per t of steel is added into the ladle in advance, and the molten iron after desulfurization contains S: 0.010 percent, completely removing the desulfurized iron slag;
(2) a converter smelting process:
A. the steel ladle requires continuous use of a red ladle, the placement of three furnaces and a furnace separating ladle before size modification and standby ladle is forbidden, and the used steel ladle is stopped casting from continuous casting to tapping time of a converter for 55 min;
B. the smelting period of the converter is 25min from the beginning of iron loading to the end of steel tapping; argon blowing treatment period is 14 min; the hoisting period is 8 min; waiting for pouring for 5 min; the steel casting period of continuous casting is 55 min;
C. the composition of the converter endpoint components is controlled as follows: c: 0.06%, S: 0.011%, P: 0.022%; the end temperature is 1680 ℃; the deoxidation alloying charging sequence is as follows: concise slag charge, lime, carbon powder, high carbon ferromanganese, ferrosilicon, steel sand aluminium, the tapping begins to add concise slag charge and lime _ min, and the big argon gas volume of charging process 1100L/min stirs, uses ferrosilicon deoxidization, joins in marriage the silicon, and manganese is joined in marriage to high carbon ferromanganese, controls bale Mn: 0.25 percent; double-baffle tapping is carried out by using a sliding plate to baffle slag and a slag-baffle cone; ladle operation: after tapping, driving a steel ladle to a temperature measuring and sampling position, stirring for 6min (flow rate 1100L/min) by adopting high-strength argon gas during tapping, stirring for 4min by adopting medium-strength argon gas (flow rate 600L/min) after tapping, sampling, converting into weak argon gas blowing (flow rate 100L/min) for 10min, and controlling the temperature to be 1595 ℃ after stirring of a converter ladle; the chemical composition and the mass percentage content of the medium carbon structural steel ladle are shown in table 1; the composition of the final slag of the post-refining furnace is controlled as follows: CaO: 45% of Al2O3：25%、SiO2: 10%, FeO + MnO: 1.5%, Al powder: 4% CaO/Al2O3: 1.7, adjusting the melting point to 1450 ℃ by matching 1.5 kilograms of fluorite per t of steel, wherein the sulfur content ratio is 65;
(3) and (3) continuous casting process: the thickness of the middle thin slab continuous casting crystallizer is 150mm, the continuous casting drawing speed of the last furnace is controlled to be 1.60m/min, the temperature of the middle ladle is controlled to be 1535 ℃, an argon blowing stopper rod and an argon blowing water feeding port are used, the flow rate of argon is controlled to be 4L/min, and the back pressure is 0.01 MPa.
The thickness specification of the thin slab in the embodiment is 150mm, and the chemical composition and the mass percentage of the thin slab are shown in table 2;
the oxygen content of molten steel in the tundish in the continuous casting process is 0.0031 percent, the desulfurization capacity of final slag of the ladle reaches 40.9 percent, and the sulfur content of a finished product is controlled to be 0.0065 percent.
Example 8
The process for continuously casting the medium-thin plate blank directly on the medium carbon structural steel converter in the embodiment comprises the following steps:
(1) a molten iron pretreatment process: the temperature of molten iron before treatment is 1262 ℃, S: 0.035%; by using a magnesium powder blowing process, adding 7 kg of lime powder per t of steel into the ladle in advance, and adding S in the desulfurized molten iron: 0.009%, completely removing the desulfurized iron slag;
(2) a converter smelting process:
A. the steel ladle requires continuous use of a red ladle, the placement of three furnaces and a furnace separating ladle before size modification and standby ladle is forbidden, and the time from continuous casting stop to converter tapping is 60min for the used steel ladle;
B. the smelting period of the converter is 27min from the beginning of iron loading to the end of steel tapping; argon blowing treatment period is 12 min; the hoisting period is 6 min; waiting for pouring for 1 min; the continuous casting steel casting period is 46 min;
C. the composition of the converter endpoint components is controlled as follows: c: 0.068%, S: 0.012%, P: 0.020%; the end point temperature is 1670 ℃; the deoxidation alloying charging sequence is as follows: concise slag charge, lime, carbon powder, high carbon ferromanganese, ferrosilicon, steel sand aluminium, the tapping begins to add concise slag charge and lime 1.2min, and the big argon gas volume of charging process 1150L/min stirs, uses ferrosilicon deoxidation, joins in marriage silicon, and manganese is joined in marriage to high carbon ferromanganese, controls bale Mn: 0.40 percent; double-baffle tapping is carried out by using a sliding plate to baffle slag and a slag-baffle cone; ladle operation: after tapping, driving a steel ladle to a temperature measuring and sampling position, stirring by using high-intensity argon gas (the flow rate is 1200L/min) for 5min during tapping, stirring by using medium-intensity argon gas (the flow rate is 680L/min) for 3min after tapping, sampling, converting into weak argon gas blowing (the flow rate is 190L/min) for 9min, and controlling the temperature to be 1585 ℃ after stirring by using a converter ladle; the chemical composition and the mass percentage content of the medium carbon structural steel ladle are shown in table 1; the composition of the final slag of the post-refining furnace is controlled as follows: CaO: 50% of Al2O3：20%、SiO2: 15%, FeO + MnO: 1.2%, Al powder: 5% CaO/Al2O3: 2.2, adjusting the melting point to 1550 ℃ by adding 0.6 kg of fluorite per t of steel, wherein the sulfur content ratio is 40;
(3) and (3) continuous casting process: the thickness of the middle thin slab continuous casting crystallizer is 180mm, the continuous casting drawing speed of the last furnace is controlled to be 1.60m/min, the temperature of the tundish is controlled to be 1535 ℃, an argon blowing stopper rod and an argon blowing water feeding port are used, the flow rate of argon is controlled to be 5L/min, and the back pressure is 0.02 MPa.
The thickness specification of the thin slab in the embodiment is 180mm, and the chemical composition and the mass percentage of the thin slab are shown in table 2;
the oxygen content of molten steel in the continuous casting tundish in the process is 0.0030 percent, the desulfurization capacity of the final slag of the ladle reaches 41.7 percent, and the sulfur content of a finished product is controlled to be 0.007 percent.
Table 1 examples 1-8 carbon structural steel ladle chemical composition and mass% thereof (%)
Figure DEST_PATH_IMAGE002
The balance of the ingredients in table 1 is Fe and unavoidable impurities.
Table 2 chemical composition and mass% of thin slabs in carbon structural steel in examples 1 to 8
Figure DEST_PATH_IMAGE004
The balance of the ingredients in table 2 is Fe and unavoidable impurities.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims (4)

1. The process for continuously casting the straight-up medium-thin slab of the low-sulfur-content medium-carbon structural steel converter is characterized by comprising the following steps of:
(1) a molten iron pretreatment process: the temperature of molten iron before treatment is more than or equal to 1250 ℃, and S is less than or equal to 0.035%; by using a magnesium powder injection process, 3-7 kg of lime powder per t of steel is added into a ladle in advance, S in the desulfurized molten iron is less than or equal to 0.010%, and the desulfurized iron slag is completely removed;
(2) a converter smelting process:
A. the steel ladle requires continuous use of a red ladle, the placement of the first three furnaces and the furnace separating ladle of the size repair and standby ladle is forbidden, and the time from continuous casting stop to converter tapping is less than or equal to 60min for the used steel ladle;
B. the smelting period of the converter is 25-28 min from the beginning of iron loading to the end of steel tapping; the argon blowing treatment period is 11-14 min; the hoisting period is 5-8 min; the time to be watered is less than or equal to 5 min; the steel casting period of continuous casting is 45-55 min;
C. the composition of the converter endpoint components is controlled as follows: c is more than or equal to 0.06 percent, S is less than or equal to 0.012 percent, and P is less than or equal to 0.022 percent; the end point temperature is 1670-1680 ℃; the deoxidation alloying charging sequence is as follows: concise slag charge, lime, carbon powder, high carbon ferromanganese, ferrosilicon, steel sand aluminium, the tapping begins 1 ~ 1.5min and adds concise slag charge and lime, and the big argon gas volume of 1000 ~ 1200L/min of feeding process stirs, uses ferrosilicon deoxidization, joins in marriage silicon, and manganese is joined in marriage to high carbon ferromanganese, controls bale Mn: 0.25-0.40%; double-baffle tapping is carried out by using a sliding plate to baffle slag and a slag-baffle cone; ladle operation: after tapping, driving the steel ladle to a temperature measuring and sampling position, and stirring for 5-6 min by adopting high-strength argon during tapping, wherein the flow of the argon is 1000-1200L/min; after steel is discharged, stirring with medium-strength argon for 3-4 min, wherein the argon flow is 500-700L/min, then sampling, and then converting into weak argon blowing for 8-10 min, wherein the argon flow is 100-200L/min, and the temperature of the converter bale after stirring is controlled to be 1585-1595 ℃;
(3) and (3) continuous casting process: controlling the continuous casting drawing speed of the last furnace to be 1.6-1.8 m/min, controlling the temperature of a tundish to be 1535-1555 ℃, using an argon blowing stopper rod and an argon blowing water feeding port, controlling the flow of argon to be 3-6L/min, and controlling the spare pressure to be more than or equal to 0.01 MPa;
the thickness specification of the medium and thin slab is 150-180 mm;
the oxygen content of molten steel of the tundish in the process of continuous casting is 0.0026-0.0032%, the desulfurization capacity of final slag of the ladle reaches 31.8-42.9%, and the sulfur content of a finished product is controlled at 0.006-0.008%.
2. The process for continuously casting the medium thin slab in the converter with the low sulfur content and the medium carbon structural steel according to claim 1, wherein the thickness of the medium thin slab continuous casting crystallizer is 150-180 mm.
3. The process for continuously casting the medium-thin plate blank directly on the medium-carbon structural steel converter with low sulfur content according to claim 1, wherein the medium-carbon structural steel ladle comprises the following chemical components in percentage by mass: c: 0.16-0.22%, Si: 0.12 to 0.25%, Mn: 0.25-0.40%, S is less than or equal to 0.008%, P is less than or equal to 0.025%, and the balance is Fe and inevitable impurities.
4. The process for continuously casting straight-up medium thin slabs of a medium carbon structural steel converter with low sulfur content according to any one of claims 1 to 3, wherein CaO in the lime powder is more than or equal to 88 percent, MgO is less than or equal to 5 percent, and SiO in the lime powder2Less than or equal to 1.5 percent, less than or equal to 0.05 percent of S, more than or equal to 350ml of activity and 1-5 mm of granularity.
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