CN112496287A - Steelmaking process for controlling air hole defects of continuous casting slab - Google Patents

Steelmaking process for controlling air hole defects of continuous casting slab Download PDF

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Publication number
CN112496287A
CN112496287A CN202011138749.4A CN202011138749A CN112496287A CN 112496287 A CN112496287 A CN 112496287A CN 202011138749 A CN202011138749 A CN 202011138749A CN 112496287 A CN112496287 A CN 112496287A
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control module
central control
matrix
molten steel
preset
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CN202011138749.4A
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CN112496287B (en
Inventor
王光文
李维华
吴长锡
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Fujian Sanbao Steel Co Ltd
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Fujian Sanbao Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • 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
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • 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
    • B22D11/116—Refining the metal
    • B22D11/117—Refining the metal by treating with gases
    • 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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B22D11/208—Controlling or regulating processes or operations for removing cast stock for aligning the guide rolls
    • 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
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The invention relates to a steelmaking process for controlling the pore defects of a continuous casting slab, which is characterized by comprising the following steps of: firstly, conveying a steel ladle filled with refined molten steel to a rotary table, and injecting the molten steel into a tundish after the rotary table is rotated to a casting position; detecting the liquid level height of molten steel in a tundish, adjusting the opening of water gaps of the tundish according to the liquid level height of the molten steel, distributing the molten steel to a plurality of crystallizers by the tundish through the water gaps, arranging submerged water gaps in the crystallizers, and introducing argon for sealing the water gaps into the submerged water gaps; step three, the molten steel is preliminarily formed into a steel billet in a crystallizer, the steel billet is lowered to a pipeline by the crystallizer, and the steel billet is subjected to secondary water cooling in the pipeline; step four, pulling the steel billet subjected to secondary water cooling out of a pipeline by a pulling and straightening roller; and step five, cutting the steel billet by a cutting device according to the length of the required casting blank. According to the invention, the blowing amount of argon is intelligently adjusted through the control module, so that the bubble defect in the continuous casting billet is reduced.

Description

Steelmaking process for controlling air hole defects of continuous casting slab
Technical Field
The invention relates to the technical field of steel making, in particular to a steel making process for controlling the pore defects of a continuous casting slab.
Background
The quality of the continuous casting billet is an important factor influencing the qualification rate and the production cost of a final product, and the condition of ensuring good continuous casting billet quality is a precondition for hot delivery, hot charging and direct rolling. The bubble defect is one of the common defects in the casting blank, and the defect detection of the casting blank is often unqualified.
In the casting process of molten steel, negative pressure can be formed near a water gap bowl due to the rapid flowing of the molten steel, air is sucked, and secondary oxidation of the molten steel is caused to be a common cause of bubble defects. In order to avoid air suction, a sealing member is generally provided in the bowl of the nozzle, and argon gas is blown from the sealing member to prevent air suction, thereby protecting the molten steel from secondary oxidation. However, the blowing amount of argon gas into the cast steel is often manually adjusted at present, which results in unstable quality of the cast steel and frequent occurrence of bubble defects.
Disclosure of Invention
Therefore, the invention provides a steelmaking process for controlling the air hole defect of a continuous casting slab, which is used for overcoming the problem that the air hole defect is still frequently caused by manually adjusting the blowing-in amount of argon in the prior art.
In order to achieve the aim, the invention provides a steelmaking process for controlling the pore defects of a continuous casting slab, which comprises the following steps:
firstly, conveying a steel ladle filled with refined molten steel to a rotary table, and injecting the molten steel into a tundish after the rotary table is rotated to a casting position;
detecting the liquid level height of molten steel in a tundish, adjusting the opening of water gaps of the tundish according to the liquid level height of the molten steel, distributing the molten steel to a plurality of crystallizers by the tundish through the water gaps, arranging submerged water gaps in the crystallizers, and introducing argon for sealing the water gaps into the submerged water gaps;
step three, the molten steel is preliminarily formed into a steel billet in a crystallizer, the steel billet is lowered to a pipeline by the crystallizer, and the steel billet is subjected to secondary water cooling in the pipeline;
pulling the steel billet subjected to secondary water cooling out of a pipeline by a pulling and straightening roller and performing shape correction on the steel billet;
step five, cutting the steel billet by a cutting device according to the length of the required casting blank;
the central control module is provided with a molten steel condensation quantity matrix C0 in the crystallizer, an argon blowing quantity adjusting parameter matrix b0 and a primary water cooling water circulation speed adjusting parameter matrix e0(e1, e 2);
for molten steel coagulation matrixes C0 and C0(C1, C2, C3 and C4) in the crystallizer, wherein C1 is a first preset coagulation amount, C2 is a second preset coagulation amount, C3 is a third preset coagulation amount, and C4 is a fourth preset coagulation amount;
for the argon blowing quantity adjusting parameter matrix group b0, b0(b1, b2), wherein b1 is a molten steel condensation speed argon blowing quantity adjusting parameter matrix, and b2 is a tundish liquid level height argon blowing quantity adjusting parameter matrix;
for molten steel condensation speed argon blowing quantity adjusting parameter matrixes b1 and b1(b11 and b12), wherein b11 is a first preset molten steel condensation speed argon blowing quantity adjusting parameter, and b12 is a second preset molten steel condensation speed argon blowing quantity adjusting parameter;
adjusting argon blowing quantity parameter matrixes b2 and b2(b21 and b22) for the height of the liquid level of the tundish, wherein b21 is a first preset argon blowing quantity parameter for adjusting the height of the liquid level of the tundish, and b22 is a second preset argon blowing quantity parameter for adjusting the height of the liquid level of the tundish;
for the primary water cooling water circulation speed adjusting parameter matrix e0, e0(e1, e2), wherein e1 is a first preset primary water cooling water circulation speed adjusting parameter, and e2 is a second preset primary water cooling water circulation speed adjusting parameter;
when the condensation detection duration T is passed, the condensation sensor detects the molten steel condensation amount C in the crystallizer and transmits a detection result to the central control module, and the central control module compares the internal parameters C with the internal parameters C0:
when C is greater than C1 and less than or equal to C2, the central control module selects b11 from the matrix b1 as a parameter for adjusting the molten steel condensation amount and the argon blowing amount, calculates delta C, and regulates the argon blowing amount to Bi 'according to the calculation result, wherein the delta C is C2-C, and the Bi' is Bi '-Bi' × b 11;
when C is more than C2 and less than or equal to C3, the central control module does not adjust the blowing amount Bi' of argon;
when C is greater than C3 and less than or equal to C4, the central control module selects b12 from the matrix b1 as a parameter for adjusting the molten steel condensation amount and the argon blowing amount, calculates delta C, delta C-C3, and adjusts the argon blowing amount to Bi ' Bi ' + Bi ' × b12 according to the calculation result;
when the condensation amount is not more than C1 and not more than C4, the central control module adjusts the circulation speed of the primary water cold water:
when C is less than or equal to C1, the central control module adjusts the argon blowing amount to Bi ', Bi' -Bi '× (C2-C1), the central control module calculates Delta C, Delta C' -C2-C, and the central control module adjusts the primary water cold water circulation speed Ei ', Ei' -Ei + Delta C × e1 according to the calculation result;
when C is more than C4, the central control module adjusts the argon blowing amount to Bi ', Bi ' + Bi ' × (C4-C3), calculates Delta C, Delta C-C3, and according to the calculation result, the central control module adjusts the primary water cold water circulation speed Ei ', Ei ' -Ei-Delta C × e 2;
and after the adjustment of the primary water cooling water circulation speed is finished, detecting the condensation amount C 'of the molten steel in the crystallizer by the condensation sensor when the condensation detection time length T passes, transmitting the detection result to the central control module, and repeating the operation until C' is more than C1.
Further, the central control module is also provided with a molten steel type matrix A0, an argon blowing amount initial preset matrix B0, a liquid level height matrix D0 and a crystallizer primary water cold water circulation speed matrix E0;
a molten steel type matrix A0 and A0(A1, A2, A3 and A4) are arranged for the central control module, wherein A1 is a first preset molten steel type, A2 is a second preset molten steel type, A3 is a third preset molten steel type, and A4 is a fourth preset molten steel type;
a matrix B0, B0(B1, B2, B3, B4) is initially preset for the argon blowing amount, wherein B1 is a first preset initial argon blowing amount, B2 is a second preset initial argon blowing amount, B3 is a third preset initial argon blowing amount, and B4 is a fourth preset initial argon blowing amount;
for the liquid level height matrix D0, D0(D1, D2, D3, D4), wherein D1 is the first predetermined liquid level height, D2 is the second predetermined liquid level height, D3 is the third predetermined liquid level height, and D4 is the fourth predetermined liquid level height;
for a crystallizer primary water cooling water circulation speed matrix E0, E0(E1, E2, E3, E4), where E1 is a first preset primary water cooling water circulation speed, E2 is a second preset primary water cooling water circulation speed, E3 is a third preset primary water cooling water circulation speed, and E4 is a fourth preset primary water cooling water circulation speed;
the central control module compares the type A of the tundish molten steel with the internal parameters of a matrix A0:
when the A is judged to be the A1 type molten steel, the central control module selects B1 from the B0 matrix as the initial argon blowing amount and selects E1 from the E0 matrix as the primary water cooling water circulation speed;
when the A is judged to be the A2 type molten steel, the central control module selects B2 from the B0 matrix as the initial argon blowing amount and selects E2 from the E0 matrix as the primary water cooling water circulation speed;
when the A is judged to be the A3 type molten steel, the central control module selects B3 from the B0 matrix as the initial argon blowing amount and selects E3 from the E0 matrix as the primary water cooling water circulation speed;
when the A is judged to be the A4 type molten steel, the central control module selects B4 from the B0 matrix as the initial argon blowing amount and selects E4 from the E0 matrix as the primary water cooling water circulation speed;
after the selection is finished, the central control module adjusts the argon blowing amount to Bi and adjusts the primary water cold water circulation speed to Ei, wherein i is 1,2,3 and 4;
the sensor detects the liquid level D of the tundish and transmits a detection result to the central control module, and the central control module compares the internal parameters D and D0:
when D1 is larger than D and is less than or equal to D2, the central control module selects b21 from the matrix b2 as a liquid level height to adjust the argon blowing amount parameter, calculates delta D, and regulates the argon blowing amount to be Bi 'and Bi' to be Bi-Bi multiplied by b21 according to the calculation result, wherein the delta D is D2-D;
when D is more than D2 and less than or equal to D3, the central control module does not adjust the blowing amount Bi of argon;
when D3 is larger than D and is less than or equal to D4, the central control module selects b22 from the matrix b2 as a liquid level height to adjust the argon blowing amount parameter, calculates delta D, delta D-D3, and adjusts the argon blowing amount to Bi 'and Bi' ═ Bi + Bi multiplied by b22 according to the calculation result.
Further, the central control module is also provided with a friction force matrix F0 between the steel billet and the crystallizer wall, a friction force difference matrix F0 and a medicament addition quantity parameter matrix G0;
for the friction force matrixes F0, F0(F1, F2, F3, F4), wherein F1 is a standard value of the friction force between the first predetermined steel billet and the wall of the crystallizer, F2 is a standard value of the friction force between the second predetermined steel billet and the wall of the crystallizer, F3 is a standard value of the friction force between the third predetermined steel billet and the wall of the crystallizer, and F4 is a standard value of the friction force between the fourth predetermined steel billet and the wall of the crystallizer;
for the friction difference matrix f0, f0(f1, f2, f3, f4), where f1 is a first predetermined friction difference, f2 is a second predetermined friction difference, f3 is a third predetermined friction difference, and f4 is a fourth predetermined friction difference;
for the agent addition quantity parameter matrixes G0 and G0(G1, G2 and G3), wherein G1 is a first preset agent addition quantity, G2 is a second preset agent addition quantity, and G3 is a third preset agent addition quantity;
when the A is judged to be A1 type molten steel, the central control module selects F1 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the A is judged to be A2 type molten steel, the central control module selects F2 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the A is judged to be A3 type molten steel, the central control module selects F3 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the A is judged to be A4 type molten steel, the central control module selects F4 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the crystallizer is used for lowering the steel billet into the pipeline, the friction force sensor detects the friction force F between the steel billet and the wall of the crystallizer and transmits a detection result to the central control module, the central control module calculates the difference F between the actual friction force and a standard value of the friction force, F is F-Fi, and the central control module compares the F with the internal parameters of F0:
when f is less than or equal to f1, the central control module judges that the molten steel is completely deoxidized and does not put medicament into the crystallizer
When f is more than f1 and less than or equal to f2, the central control module judges that the molten steel is not completely deoxidized and puts a medicament with the addition of G1 into the crystallizer;
when f is more than f2 and less than or equal to f3, the central control module judges that the molten steel is not completely deoxidized and puts a medicament with the addition of G2 into the crystallizer;
and when f is more than f3 and less than or equal to f4, the central control module judges that the molten steel is not completely deoxidized and adds a medicament with the addition amount of G3 into the crystallizer.
Further, the central control module is also provided with a secondary water cooling water circulation speed matrix H0 and a secondary water cooling water circulation speed adjusting parameter matrix H0;
for the secondary water cold water circulation speed matrix H0, H0(H1, H2, H3, H4), wherein H1 is a first preset secondary water cold water circulation speed, H2 is a second preset secondary water cold water circulation speed, H3 is a third preset secondary water cold water circulation speed, and H4 is a fourth preset secondary water cold water circulation speed;
for secondary water cooling water circulation speed adjusting parameter matrixes h0, h0(h1, h2, h3 and h4), wherein h1 is a first preset secondary water cooling water circulation speed adjusting parameter, h2 is a second preset secondary water cooling water circulation speed adjusting parameter, h3 is a third preset secondary water cooling water circulation speed adjusting parameter, and h4 is a fourth preset secondary water cooling water circulation speed adjusting parameter;
when the A is judged to be A1 type molten steel, the central control module selects H1 from the matrix H0 as the circulation speed of secondary water cold water;
when the A is judged to be A2 type molten steel, the central control module selects H2 from the matrix H0 as the circulation speed of secondary water cold water;
when the A is judged to be A3 type molten steel, the central control module selects H3 from the matrix H0 as the circulation speed of secondary water cold water;
when the A is judged to be A4 type molten steel, the central control module selects H4 from the matrix H0 as the circulation speed of secondary water cold water;
and the central control module adjusts the circulation speed of the secondary water cold water to Hi after the selection is finished and adjusts the circulation speed according to the condensation speed of the molten steel:
when C is less than or equal to C1, the central control module selects h1 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; when C is more than C1 and less than or equal to C2, the central control module selects h2 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; the central control module calculates the delta C, the delta C is C2-C, and the central control module adjusts the circulation speed of the secondary water cold water into Hi ', Hi' is Hi + delta C multiplied by hj, j is 1,2 according to the calculation result;
when C is more than C2 and less than or equal to C3, the central control module does not adjust the circulation speed Hi of the secondary water cold water;
when C is more than C3 and less than or equal to C4, the central control module selects h3 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; when C is larger than C4, the central control module selects h4 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; and the central control module calculates the delta C, the delta C is C-C3, and adjusts the circulation speed of the secondary water cold water to Hi ', Hi' -Hi-delta C multiplied by hk, and k is 3 and 4 according to the calculation result.
Further, the central control module is further provided with a withdrawal and straightening speed matrix L0, L0(L1, L2, L3, L4), wherein L1 is a first preset withdrawal and straightening speed, L2 is a second preset withdrawal and straightening speed, L3 is a third preset withdrawal and straightening speed, and L4 is a fourth preset withdrawal and straightening speed;
when the A is judged to be A1 type molten steel, the central control module selects L1 from the matrix L0 as the withdrawal and straightening speed;
when the A is judged to be A2 type molten steel, the central control module selects L2 from the matrix L0 as the withdrawal and straightening speed;
when the A is judged to be A3 type molten steel, the central control module selects L3 from the matrix L0 as the withdrawal and straightening speed;
when the A is judged to be A4 type molten steel, the central control module selects L4 from the matrix L0 as the withdrawal and straightening speed;
and after the selection is finished, the central control module adjusts the speed of the pulling and straightening roller to be Li.
Furthermore, a vibrator is arranged outside the crystallizer and is used for vibrating the steel billet in the crystallizer to enable the steel billet to be lowered to the pipeline and preventing the steel billet from adhering to the wall of the crystallizer when the steel billet is condensed.
Further, the argon concentration delivered to the crystallizer is greater than 99%.
Further, be equipped with temperature-sensing ware and heating device in the middle package, when detecting that the temperature of steel liquid reduces in the package, the middle package can heat the steel liquid in the package.
Further, the crystallizer is provided with electromagnetic stirring, the electromagnetic stirring adopts a continuous stirring mode, and the current and the frequency decibel of the electromagnetic stirring are set to be 102-140A and 4 Hz.
Compared with the prior art, the invention has the advantages that the central control module is provided with a molten steel condensation quantity matrix C0(C1, C2, C3 and C4), a primary water cooling water circulation speed adjusting parameter matrix e0(e1 and e2) and an argon blowing quantity adjusting parameter matrix group b0(b1 and b2) in the crystallizer, wherein b1 is a parameter matrix for adjusting the argon blowing amount at the molten steel condensation speed, b1(b11, b12), b2 is a parameter matrix for adjusting the argon blowing amount at the liquid level of the tundish, b2(b21, b22), when the condensation detection time length T is passed, the condensation sensor detects the condensation quantity C of the molten steel in the crystallizer and transmits the detection result to the central control module, the central control module compares the C with the internal parameters of C0, adjust the argon gas volume of blowing in and adjust the speed of condensing through adjusting a water cooling water circulation speed through the contrast result, the intelligent regulation argon gas volume of blowing in has reduced the bubble defect in the continuous casting billet.
Furthermore, the central control module is further provided with a molten steel type matrix A0(A1, A2, A3 and A4), an argon blowing amount initial preset matrix B0(B1, B2, B3 and B4), a liquid level height matrix D0(D1, D2, D3 and D4) and a crystallizer primary water cooling water circulation speed matrix E0(E1, E2, E3 and E4), the central control module determines the initial argon blowing amount and the primary water cooling water circulation speed through the molten steel type and adjusts the argon blowing amount through the liquid level height, the argon blowing amount is further intelligently adjusted, and bubble defects in the continuous casting billet are reduced.
Further, the central control module is further provided with a steel billet and crystallizer wall friction force matrix F0(F1, F2, F3 and F4), a friction force difference matrix F0(F1, F2, F3 and F4) and a medicament addition quantity parameter matrix G0(G1, G2 and G3), when the steel billet is lowered into the pipeline by the crystallizer, the friction force sensor detects the friction force F between the steel billet and the crystallizer wall and transmits the detection result to the central control module, the central control module calculates the difference F between the actual friction force and the friction force standard value, F is F-Fi, the central control module compares the internal parameters of F and F0 to judge whether the molten steel is completely deoxidized and adds a corresponding medicament into the incompletely deoxidized molten steel, the oxygen content is monitored intelligently, and the bubble defects in the continuous casting billet are further reduced.
Furthermore, the central control module is also provided with a secondary water cold water circulation speed matrix H0(H1, H2, H3 and H4) and a secondary water cold water circulation speed adjusting parameter matrix H0(H1, H2, H3 and H4), the central control module selects a corresponding secondary water cold water circulation speed according to the type of molten steel, when the condensation detection duration T passes, the condensation sensor detects the condensation amount C of the molten steel in the crystallizer and transmits the detection result to the central control module, the central control module compares the C with the internal parameters of the C0, the secondary water cold water circulation speed is adjusted according to the comparison result, and the quality and the production efficiency of the continuous casting are improved.
Furthermore, the central control module is also provided with a withdrawal and straightening speed matrix L0(L1, L2, L3 and L4), and the central control module selects the corresponding withdrawal and straightening speed of the withdrawal and straightening roller according to the type of molten steel, so that the quality and the production efficiency of the continuous casting billet are further improved.
Furthermore, a vibrator is arranged outside the crystallizer and used for vibrating the steel billet in the crystallizer to enable the steel billet to be placed down to the pipeline and preventing the steel billet from adhering to the wall of the crystallizer when being condensed, the quality and the production efficiency of continuous casting billets are further improved, the wall of the crystallizer is protected, and the maintenance cost of the crystallizer is reduced.
Furthermore, the concentration of the conveyed argon is more than 99%, and the high-concentration argon is adopted, so that the pollution to molten steel is reduced, and the quality of the continuous casting billet is further improved.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It is noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicate directional or positional relationships that are used for convenience of description only, and do not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The invention relates to a steelmaking process for controlling the pore defects of a continuous casting slab, which comprises the following steps:
firstly, conveying a steel ladle filled with refined molten steel to a rotary table, and injecting the molten steel into a tundish after the rotary table is rotated to a casting position;
detecting the liquid level height of molten steel in a tundish, adjusting the opening of water gaps of the tundish according to the liquid level height of the molten steel, distributing the molten steel to a plurality of crystallizers by the tundish through the water gaps, arranging submerged water gaps in the crystallizers, and introducing argon for sealing the water gaps into the submerged water gaps;
step three, the molten steel is preliminarily formed into a steel billet in a crystallizer, the steel billet is lowered to a pipeline by the crystallizer, and the steel billet is subjected to secondary water cooling in the pipeline;
pulling the steel billet subjected to secondary water cooling out of a pipeline by a pulling and straightening roller and performing shape correction on the steel billet;
and step five, cutting the steel billet by a cutting device according to the length of the required casting blank.
The central control module is provided with a molten steel condensation quantity matrix C0 in the crystallizer, an argon blowing quantity adjusting parameter matrix b0 and a primary water cooling water circulation speed adjusting parameter matrix e0(e1, e 2).
For molten steel coagulation matrixes C0 and C0(C1, C2, C3 and C4) in the crystallizer, wherein C1 is a first preset coagulation amount, C2 is a second preset coagulation amount, C3 is a third preset coagulation amount, and C4 is a fourth preset coagulation amount;
and adjusting parameter matrix groups b0 and b0(b1 and b2) of argon blowing amount, wherein b1 is a molten steel condensation speed argon blowing amount adjusting parameter matrix, b2 is a tundish liquid level height argon blowing amount adjusting parameter matrix, and b3 is a medicament addition amount argon blowing amount adjusting parameter matrix.
And (3) adjusting parameter matrixes b1 and b1(b11 and b12) of the argon blowing amount of the molten steel condensation speed, wherein b11 is a first preset molten steel condensation speed argon blowing amount adjusting parameter, and b12 is a second preset molten steel condensation speed argon blowing amount adjusting parameter.
And adjusting argon blowing quantity parameter matrixes b2 and b2(b21, b22 and b23) for the liquid level of the tundish, wherein b21 is a first preset argon blowing quantity parameter for adjusting the liquid level of the tundish, and b22 is a second preset argon blowing quantity parameter for adjusting the liquid level of the tundish.
For the primary water cooling water circulation speed adjusting parameter matrix e0, e0(e1, e2), wherein e1 is a first preset primary water cooling water circulation speed adjusting parameter, and e2 is a second preset primary water cooling water circulation speed adjusting parameter;
when the condensation detection duration T is passed, the condensation sensor detects the molten steel condensation amount C in the crystallizer and transmits a detection result to the central control module, and the central control module compares the internal parameters C with the internal parameters C0:
when C is greater than C1 and less than or equal to C2, the central control module selects b11 from the matrix b1 as a parameter for adjusting the molten steel condensation amount and the argon blowing amount, calculates delta C, and regulates the argon blowing amount to Bi 'according to the calculation result, wherein the delta C is C2-C, and the Bi' is Bi '-Bi' × b 11;
when C is more than C2 and less than or equal to C3, the central control module does not adjust the blowing amount Bi' of argon;
and when C3 is larger than C and smaller than or equal to C4, the central control module selects b12 from the matrix b1 as a parameter for adjusting the molten steel condensation amount and the argon blowing amount, calculates the delta C, the delta C is equal to C-C3, and adjusts the argon blowing amount to Bi 'according to the calculation result, wherein the Bi' is equal to Bi '+ Bi' × b 12.
When the condensation amount is not more than C1 and not more than C4, the central control module adjusts the circulation speed of the primary water cold water:
when C is less than or equal to C1, the central control module adjusts the argon blowing amount to Bi ', Bi' -Bi '× (C2-C1), the central control module calculates Delta C, Delta C' -C2-C, and the central control module adjusts the primary water cold water circulation speed Ei ', Ei' -Ei + Delta C × e1 according to the calculation result;
when C is more than C4, the central control module adjusts the argon blowing amount to Bi ', Bi ' + Bi ' × (C4-C3), calculates Delta C, Delta C-C3, and according to the calculation result, the central control module adjusts the primary water cold water circulation speed Ei ', Ei ' -Ei-Delta C × e 2;
and after the adjustment of the primary water cooling water circulation speed is finished, detecting the condensation amount C 'of the molten steel in the crystallizer by the condensation sensor when the condensation detection time length T passes, transmitting the detection result to the central control module, and repeating the operation until C' is more than C1.
Specifically, the central control module is further provided with a molten steel type matrix A0, an initial argon blowing amount preset matrix B0, a liquid level height matrix D0 and a crystallizer primary water cold water circulation speed matrix E0;
a molten steel type matrix A0 and A0(A1, A2, A3 and A4) are arranged for the central control module, wherein A1 is a first preset molten steel type, A2 is a second preset molten steel type, A3 is a third preset molten steel type, and A4 is a fourth preset molten steel type;
a matrix B0, B0(B1, B2, B3, B4) is initially preset for the argon blowing amount, wherein B1 is a first preset initial argon blowing amount, B2 is a second preset initial argon blowing amount, B3 is a third preset initial argon blowing amount, and B4 is a fourth preset initial argon blowing amount;
for the liquid level height matrix D0, D0(D1, D2, D3, D4), wherein D1 is the first predetermined liquid level height, D2 is the second predetermined liquid level height, D3 is the third predetermined liquid level height, and D4 is the fourth predetermined liquid level height;
for a crystallizer primary water cooling water circulation speed matrix E0, E0(E1, E2, E3, E4), where E1 is a first preset primary water cooling water circulation speed, E2 is a second preset primary water cooling water circulation speed, E3 is a third preset primary water cooling water circulation speed, and E4 is a fourth preset primary water cooling water circulation speed;
the central control module compares the type A of the tundish molten steel with the internal parameters of a matrix A0:
when the A is judged to be the A1 type molten steel, the central control module selects B1 from the B0 matrix as the initial argon blowing amount and selects E1 from the E0 matrix as the primary water cooling water circulation speed;
when the A is judged to be the A2 type molten steel, the central control module selects B2 from the B0 matrix as the initial argon blowing amount and selects E2 from the E0 matrix as the primary water cooling water circulation speed;
when the A is judged to be the A3 type molten steel, the central control module selects B3 from the B0 matrix as the initial argon blowing amount and selects E3 from the E0 matrix as the primary water cooling water circulation speed;
when the A is judged to be the A4 type molten steel, the central control module selects B4 from the B0 matrix as the initial argon blowing amount and selects E4 from the E0 matrix as the primary water cooling water circulation speed;
after the selection is finished, the central control module adjusts the argon blowing amount to Bi and adjusts the primary water cold water circulation speed to Ei, wherein i is 1,2,3 and 4;
the sensor detects the liquid level D of the tundish and transmits a detection result to the central control module, and the central control module compares the internal parameters D and D0:
when D1 is larger than D and is less than or equal to D2, the central control module selects b21 from the matrix b2 as a liquid level height to adjust the argon blowing amount parameter, calculates delta D, and regulates the argon blowing amount to be Bi 'and Bi' to be Bi-Bi multiplied by b21 according to the calculation result, wherein the delta D is D2-D;
when D is more than D2 and less than or equal to D3, the central control module does not adjust the blowing amount Bi of argon;
when D3 is larger than D and is less than or equal to D4, the central control module selects b22 from the matrix b2 as a liquid level height to adjust the argon blowing amount parameter, calculates delta D, delta D-D3, and adjusts the argon blowing amount to Bi 'and Bi' ═ Bi + Bi multiplied by b22 according to the calculation result.
Specifically, the central control module is also provided with a friction force matrix F0 between the steel billet and the crystallizer wall, a friction force difference matrix F0 and a medicament addition quantity parameter matrix G0;
for the friction force matrixes F0, F0(F1, F2, F3, F4), wherein F1 is a standard value of the friction force between the first predetermined steel billet and the wall of the crystallizer, F2 is a standard value of the friction force between the second predetermined steel billet and the wall of the crystallizer, F3 is a standard value of the friction force between the third predetermined steel billet and the wall of the crystallizer, and F4 is a standard value of the friction force between the fourth predetermined steel billet and the wall of the crystallizer;
for the friction difference matrix f0, f0(f1, f2, f3, f4), where f1 is a first predetermined friction difference, f2 is a second predetermined friction difference, f3 is a third predetermined friction difference, and f4 is a fourth predetermined friction difference;
for the agent addition quantity parameter matrixes G0 and G0(G1, G2 and G3), wherein G1 is a first preset agent addition quantity, G2 is a second preset agent addition quantity, and G3 is a third preset agent addition quantity;
when the A is judged to be A1 type molten steel, the central control module selects F1 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the A is judged to be A2 type molten steel, the central control module selects F2 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the A is judged to be A3 type molten steel, the central control module selects F3 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the A is judged to be A4 type molten steel, the central control module selects F4 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the crystallizer is used for lowering the steel billet into the pipeline, the friction force sensor detects the friction force F between the steel billet and the wall of the crystallizer and transmits a detection result to the central control module, the central control module calculates the difference F between the actual friction force and a standard value of the friction force, F is F-Fi, and the central control module compares the F with the internal parameters of F0:
when f is less than or equal to f1, the central control module judges that the molten steel is completely deoxidized and does not put medicament into the crystallizer
When f is more than f1 and less than or equal to f2, the central control module judges that the molten steel is not completely deoxidized and puts a medicament with the addition of G1 into the crystallizer;
when f is more than f2 and less than or equal to f3, the central control module judges that the molten steel is not completely deoxidized and puts a medicament with the addition of G2 into the crystallizer;
and when f is more than f3 and less than or equal to f4, the central control module judges that the molten steel is not completely deoxidized and adds a medicament with the addition amount of G3 into the crystallizer.
Specifically, the central control module is also provided with a secondary water cooling water circulation speed matrix H0 and a secondary water cooling water circulation speed adjusting parameter matrix H0;
for the secondary water cold water circulation speed matrix H0, H0(H1, H2, H3, H4), wherein H1 is a first preset secondary water cold water circulation speed, H2 is a second preset secondary water cold water circulation speed, H3 is a third preset secondary water cold water circulation speed, and H4 is a fourth preset secondary water cold water circulation speed;
for secondary water cooling water circulation speed adjusting parameter matrixes h0, h0(h1, h2, h3 and h4), wherein h1 is a first preset secondary water cooling water circulation speed adjusting parameter, h2 is a second preset secondary water cooling water circulation speed adjusting parameter, h3 is a third preset secondary water cooling water circulation speed adjusting parameter, and h4 is a fourth preset secondary water cooling water circulation speed adjusting parameter;
when the A is judged to be A1 type molten steel, the central control module selects H1 from the matrix H0 as the circulation speed of secondary water cold water;
when the A is judged to be A2 type molten steel, the central control module selects H2 from the matrix H0 as the circulation speed of secondary water cold water;
when the A is judged to be A3 type molten steel, the central control module selects H3 from the matrix H0 as the circulation speed of secondary water cold water;
when the A is judged to be A4 type molten steel, the central control module selects H4 from the matrix H0 as the circulation speed of secondary water cold water;
and the central control module adjusts the circulation speed of the secondary water cold water to Hi after the selection is finished and adjusts the circulation speed according to the condensation speed of the molten steel:
when C is less than or equal to C1, the central control module selects h1 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; when C is more than C1 and less than or equal to C2, the central control module selects h2 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; the central control module calculates the delta C, the delta C is C2-C, and the central control module adjusts the circulation speed of the secondary water cold water into Hi ', Hi' is Hi + delta C multiplied by hj, j is 1,2 according to the calculation result;
when C is more than C2 and less than or equal to C3, the central control module does not adjust the circulation speed Hi of the secondary water cold water;
when C is more than C3 and less than or equal to C4, the central control module selects h3 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; when C is larger than C4, the central control module selects h4 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; and the central control module calculates the delta C, the delta C is C-C3, and adjusts the circulation speed of the secondary water cold water to Hi ', Hi' -Hi-delta C multiplied by hk, and k is 3 and 4 according to the calculation result.
Specifically, the central control module is further provided with pulling and straightening speed matrixes L0 and L0(L1, L2, L3 and L4), wherein L1 is a first preset pulling and straightening speed, L2 is a second preset pulling and straightening speed, L3 is a third preset pulling and straightening speed, and L4 is a fourth preset pulling and straightening speed;
when the A is judged to be A1 type molten steel, the central control module selects L1 from the matrix L0 as the withdrawal and straightening speed;
when the A is judged to be A2 type molten steel, the central control module selects L2 from the matrix L0 as the withdrawal and straightening speed;
when the A is judged to be A3 type molten steel, the central control module selects L3 from the matrix L0 as the withdrawal and straightening speed;
when the A is judged to be A4 type molten steel, the central control module selects L4 from the matrix L0 as the withdrawal and straightening speed;
and after the selection is finished, the central control module adjusts the speed of the pulling and straightening roller to be Li.
Specifically, a vibrator is arranged outside the crystallizer to vibrate the billet inside the crystallizer to enable the billet to be lowered to the pipeline and prevent the billet from adhering to the wall of the crystallizer when the billet is condensed.
Specifically, the argon is delivered to the crystallizer at a concentration greater than 99%.
Particularly, be equipped with temperature-sensing ware and heating device in the middle package, when detecting that the temperature of steel liquid reduces in the package, the middle package can heat the steel liquid in the package.
Specifically, the crystallizer is provided with electromagnetic stirring, the electromagnetic stirring adopts a continuous stirring mode, and the current and the frequency decibel of the electromagnetic stirring are set to be 102-.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A steelmaking process for controlling the pore defects of continuous casting slabs is characterized by comprising the following steps:
firstly, conveying a steel ladle filled with refined molten steel to a rotary table, and injecting the molten steel into a tundish after the rotary table is rotated to a casting position;
detecting the liquid level height of molten steel in a tundish, adjusting the opening of water gaps of the tundish according to the liquid level height of the molten steel, distributing the molten steel to a plurality of crystallizers by the tundish through the water gaps, arranging submerged water gaps in the crystallizers, and introducing argon for sealing the water gaps into the submerged water gaps;
step three, the molten steel is preliminarily formed into a steel billet in a crystallizer, the steel billet is lowered to a pipeline by the crystallizer, and the steel billet is subjected to secondary water cooling in the pipeline;
pulling the steel billet subjected to secondary water cooling out of a pipeline by a pulling and straightening roller and performing shape correction on the steel billet;
step five, cutting the steel billet by a cutting device according to the length of the required casting blank;
the central control module is provided with a molten steel condensation quantity matrix C0 in the crystallizer, an argon blowing quantity adjusting parameter matrix b0 and a primary water cooling water circulation speed adjusting parameter matrix e0(e1, e 2);
for molten steel coagulation matrixes C0 and C0(C1, C2, C3 and C4) in the crystallizer, wherein C1 is a first preset coagulation amount, C2 is a second preset coagulation amount, C3 is a third preset coagulation amount, and C4 is a fourth preset coagulation amount;
for the argon gas blowing quantity adjusting parameter matrix groups b0 and b0(b1 and b2), wherein b1 is a molten steel condensation speed argon gas blowing quantity adjusting parameter matrix, b2 is a tundish liquid level height argon gas blowing quantity adjusting parameter matrix, and b3 is a medicament addition quantity argon gas blowing quantity adjusting parameter matrix;
for molten steel condensation speed argon blowing quantity adjusting parameter matrixes b1 and b1(b11 and b12), wherein b11 is a first preset molten steel condensation speed argon blowing quantity adjusting parameter, and b12 is a second preset molten steel condensation speed argon blowing quantity adjusting parameter;
adjusting argon blowing quantity parameter matrixes b2 and b2(b21 and b22) for the liquid level of the tundish, wherein b21 is a first preset argon blowing quantity parameter for adjusting the liquid level of the tundish, and b22 is a second preset argon blowing quantity parameter for adjusting the liquid level of the tundish;
for the primary water cooling water circulation speed adjusting parameter matrix e0, e0(e1, e2), wherein e1 is a first preset primary water cooling water circulation speed adjusting parameter, and e2 is a second preset primary water cooling water circulation speed adjusting parameter;
when the argon blowing-in amount is Bi', the primary water cold water circulation speed is Ei and the condensation detection duration T is passed, the condensation sensor detects the molten steel condensation amount C in the crystallizer and transmits the detection result to the central control module, and the central control module compares the internal parameters of C and C0:
when C is greater than C1 and less than or equal to C2, the central control module selects b11 from the matrix b1 as a parameter for adjusting the molten steel condensation amount and the argon blowing amount, calculates the difference delta C between C2 and C, and adjusts the argon blowing amount to Bi 'according to the calculation result, wherein the delta C is C2-C, and the Bi' is Bi '-Bi' × b 11;
when C is more than C2 and less than or equal to C3, the central control module does not adjust the blowing amount Bi' of argon;
when C is greater than C3 and less than or equal to C4, the central control module selects b12 from the matrix b1 as a parameter for adjusting the molten steel condensation amount and the argon blowing amount, calculates the difference value delta C between C and C3, wherein delta C is C-C3, and adjusts the argon blowing amount to Bi ' Bi ' + Bi ' × b12 according to the calculation result;
when the condensation amount is not more than C1 and not more than C4, the central control module adjusts the circulation speed of the primary water cold water:
when C is less than or equal to C1, the central control module adjusts the argon blowing amount to Bi ', Bi' -Bi '× (C2-C1), the central control module calculates the difference value delta C between C2 and C, delta C' -C2-C, and according to the calculation result, the central control module adjusts the primary water cold water circulation speed Ei ', Ei' -Ei + delta C × e 1;
when C is more than C4, the central control module adjusts the argon blowing amount to Bi ', Bi ' + Bi ' × (C4-C3), the central control module calculates the difference value Delta C between C and C3, the Delta C is equal to C-C3, and the central control module adjusts the primary water cold water circulation speed Ei ', Ei ' -Ei-Delta C × e2 according to the calculation result;
after the adjustment of the primary water cooling water circulation speed is finished, detecting the condensation amount C 'of the molten steel in the crystallizer by a condensation sensor when the condensation detection time length T passes, transmitting the detection result to a central control module, and repeating the operation until C1 is more than C' and less than or equal to C4; when the C1 is more than C 'and less than or equal to C4, the blowing amount Bi' of the argon is adjusted until the C2 is more than or equal to C3.
2. The steelmaking process for controlling the blow hole defects of the continuous casting slabs as claimed in claim 1, wherein the central control module is further provided with a molten steel type matrix A0, an argon blowing amount initial preset matrix B0, a liquid level height matrix D0 and a crystallizer primary water cooling water circulation speed matrix E0;
a molten steel type matrix A0 and A0(A1, A2, A3 and A4) are arranged for the central control module, wherein A1 is a first preset molten steel type, A2 is a second preset molten steel type, A3 is a third preset molten steel type, and A4 is a fourth preset molten steel type;
a matrix B0, B0(B1, B2, B3, B4) is initially preset for the argon blowing amount, wherein B1 is a first preset initial argon blowing amount, B2 is a second preset initial argon blowing amount, B3 is a third preset initial argon blowing amount, and B4 is a fourth preset initial argon blowing amount;
for the liquid level height matrix D0, D0(D1, D2, D3, D4), wherein D1 is the first predetermined liquid level height, D2 is the second predetermined liquid level height, D3 is the third predetermined liquid level height, and D4 is the fourth predetermined liquid level height;
for a crystallizer primary water cooling water circulation speed matrix E0, E0(E1, E2, E3, E4), where E1 is a first preset primary water cooling water circulation speed, E2 is a second preset primary water cooling water circulation speed, E3 is a third preset primary water cooling water circulation speed, and E4 is a fourth preset primary water cooling water circulation speed;
the central control module compares the type A of the tundish molten steel with the internal parameters of a matrix A0:
when the A is judged to be the A1 type molten steel, the central control module selects B1 from the B0 matrix as the initial argon blowing amount and selects E1 from the E0 matrix as the primary water cooling water circulation speed;
when the A is judged to be the A2 type molten steel, the central control module selects B2 from the B0 matrix as the initial argon blowing amount and selects E2 from the E0 matrix as the primary water cooling water circulation speed;
when the A is judged to be the A3 type molten steel, the central control module selects B3 from the B0 matrix as the initial argon blowing amount and selects E3 from the E0 matrix as the primary water cooling water circulation speed;
when the A is judged to be the A4 type molten steel, the central control module selects B4 from the B0 matrix as the initial argon blowing amount and selects E4 from the E0 matrix as the primary water cooling water circulation speed;
after the selection is finished, the central control module adjusts the argon blowing amount to Bi and adjusts the primary water cold water circulation speed to Ei, wherein i is 1,2,3 and 4;
the sensor detects the liquid level D of the tundish and transmits a detection result to the central control module, and the central control module compares the internal parameters D and D0:
when D1 is larger than D and is less than or equal to D2, the central control module selects b21 from the matrix b2 as a liquid level height to adjust the argon blowing amount parameter, calculates delta D, and regulates the argon blowing amount to be Bi 'and Bi' to be Bi-Bi multiplied by b21 according to the calculation result, wherein the delta D is D2-D;
when D is more than D2 and less than or equal to D3, the central control module does not adjust the blowing amount Bi of argon;
when D3 is larger than D and is less than or equal to D4, the central control module selects b22 from the matrix b2 as a liquid level height to adjust the argon blowing amount parameter, calculates delta D, delta D-D3, and adjusts the argon blowing amount to Bi 'and Bi' ═ Bi + Bi multiplied by b22 according to the calculation result.
3. The steelmaking process for controlling the blow hole defects of the continuous casting slabs as claimed in claim 2, wherein the central control module is further provided with a steel billet and crystallizer wall friction force matrix F0, a friction force difference matrix F0 and a chemical addition quantity parameter matrix G0;
for the friction force matrixes F0, F0(F1, F2, F3, F4), wherein F1 is a standard value of the friction force between the first predetermined steel billet and the wall of the crystallizer, F2 is a standard value of the friction force between the second predetermined steel billet and the wall of the crystallizer, F3 is a standard value of the friction force between the third predetermined steel billet and the wall of the crystallizer, and F4 is a standard value of the friction force between the fourth predetermined steel billet and the wall of the crystallizer;
for the friction difference matrix f0, f0(f1, f2, f3, f4), where f1 is a first predetermined friction difference, f2 is a second predetermined friction difference, f3 is a third predetermined friction difference, and f4 is a fourth predetermined friction difference;
for the agent addition quantity parameter matrixes G0 and G0(G1, G2 and G3), wherein G1 is a first preset agent addition quantity, G2 is a second preset agent addition quantity, and G3 is a third preset agent addition quantity;
when the A is judged to be A1 type molten steel, the central control module selects F1 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the A is judged to be A2 type molten steel, the central control module selects F2 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the A is judged to be A3 type molten steel, the central control module selects F3 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the A is judged to be A4 type molten steel, the central control module selects F4 from the matrix F0 as a standard value of the friction force between the steel billet and the wall of the crystallizer;
when the crystallizer is used for lowering the steel billet into the pipeline, the friction force sensor detects the friction force F between the steel billet and the wall of the crystallizer and transmits a detection result to the central control module, the central control module calculates the difference F between the actual friction force and a standard value of the friction force, F is F-Fi, and the central control module compares the F with the internal parameters of F0:
when f is less than or equal to f1, the central control module judges that the molten steel is completely deoxidized and does not put a medicament into the crystallizer;
when f is more than f1 and less than or equal to f2, the central control module judges that the molten steel is not completely deoxidized and puts a medicament with the addition of G1 into the crystallizer;
when f is more than f2 and less than or equal to f3, the central control module judges that the molten steel is not completely deoxidized and puts a medicament with the addition of G2 into the crystallizer;
and when f is more than f3 and less than or equal to f4, the central control module judges that the molten steel is not completely deoxidized and adds a medicament with the addition amount of G3 into the crystallizer.
4. The steelmaking process for controlling the blow hole defects of the continuous casting slabs as claimed in claim 2, wherein the central control module is further provided with a secondary water cooling water circulation speed matrix H0 and a secondary water cooling water circulation speed adjusting parameter matrix H0;
for the secondary water cold water circulation speed matrix H0, H0(H1, H2, H3, H4), wherein H1 is a first preset secondary water cold water circulation speed, H2 is a second preset secondary water cold water circulation speed, H3 is a third preset secondary water cold water circulation speed, and H4 is a fourth preset secondary water cold water circulation speed;
for secondary water cooling water circulation speed adjusting parameter matrixes h0, h0(h1, h2, h3 and h4), wherein h1 is a first preset secondary water cooling water circulation speed adjusting parameter, h2 is a second preset secondary water cooling water circulation speed adjusting parameter, h3 is a third preset secondary water cooling water circulation speed adjusting parameter, and h4 is a fourth preset secondary water cooling water circulation speed adjusting parameter;
when the A is judged to be A1 type molten steel, the central control module selects H1 from the matrix H0 as the circulation speed of secondary water cold water;
when the A is judged to be A2 type molten steel, the central control module selects H2 from the matrix H0 as the circulation speed of secondary water cold water;
when the A is judged to be A3 type molten steel, the central control module selects H3 from the matrix H0 as the circulation speed of secondary water cold water;
when the A is judged to be A4 type molten steel, the central control module selects H4 from the matrix H0 as the circulation speed of secondary water cold water;
and the central control module adjusts the circulation speed of the secondary water cold water to Hi after the selection is finished and adjusts the circulation speed according to the condensation speed of the molten steel:
when C is less than or equal to C1, the central control module selects h1 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; when C is more than C1 and less than or equal to C2, the central control module selects h2 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; the central control module calculates the delta C, the delta C is C2-C, and the central control module adjusts the circulation speed of the secondary water cold water into Hi ', Hi' is Hi + delta C multiplied by hj, j is 1,2 according to the calculation result;
when C is more than C2 and less than or equal to C3, the central control module does not adjust the circulation speed Hi of the secondary water cold water;
when C is more than C3 and less than or equal to C4, the central control module selects h3 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; when C is larger than C4, the central control module selects h4 from the matrix h0 as a secondary water cold water circulation speed adjusting parameter; and the central control module calculates the delta C, the delta C is C-C3, and adjusts the circulation speed of the secondary water cold water to Hi ', Hi' -Hi-delta C multiplied by hk, and k is 3 and 4 according to the calculation result.
5. The steelmaking process for controlling the blow hole defects of the continuously cast slabs as claimed in claim 2, wherein the central control module is further provided with a withdrawal and straightening speed matrix L0, L0(L1, L2, L3, L4), wherein L1 is a first preset withdrawal and straightening speed, L2 is a second preset withdrawal and straightening speed, L3 is a third preset withdrawal and straightening speed, and L4 is a fourth preset withdrawal and straightening speed;
when the A is judged to be A1 type molten steel, the central control module selects L1 from the matrix L0 as the withdrawal and straightening speed;
when the A is judged to be A2 type molten steel, the central control module selects L2 from the matrix L0 as the withdrawal and straightening speed;
when the A is judged to be A3 type molten steel, the central control module selects L3 from the matrix L0 as the withdrawal and straightening speed;
when the A is judged to be the A4 type molten steel, the central control module selects L4 from the matrix L0 as the withdrawal and straightening speed.
6. The steel making process for controlling the blow hole defect of the continuous casting slab as claimed in claim 1, wherein a vibrator is provided outside the mold to vibrate the slab inside the mold to be lowered to the pipe and to prevent the slab from adhering to the mold wall when it is coagulated.
7. The steelmaking process for controlling porosity defects in a continuously cast slab as claimed in claim 1 wherein the argon is delivered at a concentration greater than 99%.
8. The steelmaking process for controlling the blow hole defects of the continuous casting slabs as claimed in claim 1, wherein a temperature sensor and a heating device are provided in the tundish, and the tundish can heat the molten steel in the tundish when the temperature of the molten steel in the tundish is detected to be reduced.
9. The steelmaking process for controlling the defects of the pores of the continuous casting slab as claimed in claim 1, wherein the crystallizer is provided with electromagnetic stirring, the electromagnetic stirring adopts a continuous stirring mode, and the current and frequency decibel of the electromagnetic stirring are set to 102-140A and 4 Hz.
CN202011138749.4A 2020-10-22 2020-10-22 Steelmaking process for controlling air hole defects of continuous casting slab Active CN112496287B (en)

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CN113102715A (en) * 2021-04-13 2021-07-13 福建三宝钢铁有限公司 Preparation method of non-oriented silicon steel 50SBW600 for high-voltage motor
CN116855920A (en) * 2023-09-05 2023-10-10 山西中设华晋铸造有限公司 Steel strip casting process

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CN113102715A (en) * 2021-04-13 2021-07-13 福建三宝钢铁有限公司 Preparation method of non-oriented silicon steel 50SBW600 for high-voltage motor
CN116855920A (en) * 2023-09-05 2023-10-10 山西中设华晋铸造有限公司 Steel strip casting process
CN116855920B (en) * 2023-09-05 2023-11-21 山西中设华晋铸造有限公司 Steel strip casting process

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