CN115106497A - Method for controlling vibration mark defect of continuous casting slab - Google Patents
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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
- B22D11/166—Controlling or regulating processes or operations for mould oscillation
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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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
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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
- B22D11/18—Controlling or regulating processes or operations for pouring
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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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract
The invention discloses a method for controlling the vibration mark defect of a continuous casting slab, wherein in the slab continuous casting process, the vibration of a crystallizer adopts non-sinusoidal vibration; what is needed isThe parameters of the non-sinusoidal vibration are controlled as follows: negative slip time t NF = 0.10-0.15 s; negative slip speed ratio NS F =30% -40%; wave form deflection rate alpha f =20% -30%; the product h · f = 600-1300 of the vibration stroke h and the vibration frequency f; the amplitude h of the crystallizer is = 4-12 mm; the frequency f = 110-180 cpm of the crystallizer; acceleration a is less than or equal to 4m/s during vibration 2 . The method is based on the continuous casting billet vibration mark forming mechanism of the solidification hook theory, reasonably controls the process parameters of the initial solidification condition of the molten steel of the crystallizer, the interface tension of steel slag, the vibration state of the crystallizer and the like, effectively solves the technical problem of the long-term unresolved vibration mark control of the continuous casting blank, and corrects the technical bias of the vibration mark forming mechanism of the traditional fracture healing theory. The method can obviously reduce the depth of the vibration mark of the casting blank, effectively improve the yield of the casting blank and realize the production and high-speed continuous casting and rolling of the defect-free casting blank.
Description
Technical Field
The invention belongs to the technical field of continuous casting in the metallurgical industry, and particularly relates to a method for controlling the vibration mark defect of a continuous casting slab.
Background
After the continuous casting technology appears, in order to reduce the occurrence of a leakage event caused by the adhesion of a solidified blank shell to a crystallizer, the crystallizer vibration technology is generated. The vibration of the crystallizer can effectively improve the lubrication of the casting blank, avoid the adhesion and the leakage of the blank shell and the crystallizer and ensure that the continuous casting process can be stably and smoothly carried out. However, with the application of the crystallizer vibration technology, periodic transverse depressions, namely vibration marks, appear on the surface of the continuous casting billet. The damage of chatter marks is manifold: when the vibration mark is deep, transverse crack can be generated during straightening, and leakage can be caused when the vibration mark is serious; slag inclusion and composition segregation at the bottom of the vibration mark valley influence the composition uniformity and mechanical property of the rolled material; deeper chatter marks will also produce chatter marks or cracks in the cold or hot rolled coil. The surface quality of the product is seriously influenced, and the steel company usually adopts the measure of grinding the surface of the casting blank to reduce the damage, so that the yield of the continuous casting blank is greatly reduced. Therefore, the research on the mechanism of the continuous casting billet vibration mark formation becomes a hot topic of metallurgy workers, so that a technology for specifically reducing or even eliminating the vibration mark is provided, and the method has great significance for the production of a defect-free casting billet and the realization of high-speed continuous casting and rolling.
Disclosure of Invention
The invention aims to provide a method for controlling the vibration mark defect of a continuous casting slab, which has good product quality.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: 1. a method for controlling the vibration mark defect of a continuous casting slab is characterized by comprising the following steps: in the slab continuous casting process, the vibration of the crystallizer adopts non-sinusoidal vibration;
the parameters of the non-sinusoidal vibration are controlled as follows: negative slip time t NF 0.10-0.15 s; negative slip speed ratio NS F 30 to 40 percent; wave form deflection rate alpha f 20 to 30 percent; the product h & f of the vibration stroke h and the vibration frequency f is 600-1300; the amplitude h of the crystallizer is 4-12 mm; the frequency f of the crystallizer is 110-180 cpm; acceleration a is less than or equal to 4m/s during vibration 2 。
In the slab continuous casting process, the superheat degree of molten steel in a tundish is controlled to be 20-40 ℃.
In the slab continuous casting process, the drawing speed of continuous casting is 1.2-1.8 m/min.
In the slab continuous casting process, the flow speed of cooling water of the crystallizer is 5-8 m/s.
In the slab continuous casting process, the high viscosity of the crystallizer casting powder is 0.15-0.35 Pa.S.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention subverts the forming mechanism of the continuous casting machine vibration mark on the traditional textbook on the vibration mark forming mechanism, provides a new vibration mark forming mechanism and a control measure based on the new mechanism, corrects the technical bias in theory, solves the technical problem which is not solved for a long time in the continuous casting field, and realizes the production of a defect-free casting blank and the high-speed continuous casting and rolling.
The invention reasonably controls the process parameters of initial solidification conditions of molten steel in the crystallizer, steel slag interfacial tension, vibration state of the crystallizer and the like based on the mechanism of forming the vibration marks of the continuous casting billet by the solidification hook theory, effectively solves the technical problem of controlling the vibration marks of the casting billet which is not solved for a long time in the continuous casting field, and corrects the technical bias on the mechanism of forming the vibration marks by the traditional fracture healing theory. The invention can obviously reduce the depth of the vibration mark of the casting blank, effectively improve the yield of the casting blank and realize the production and high-speed continuous casting and rolling of the defect-free casting blank.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a casting blank chatter mark forming process based on conventional theories of fracture healing and the like;
FIG. 2 is a schematic diagram of a continuous casting billet vibration mark forming process based on a solidification hook theory.
In fig. 2: 1-represents the position of a primary shell formed by solidifying the molten steel in the mold, and B-represents the primary shell formed by solidifying the molten steel in the mold; 2-represents a position of a meniscus of the molten steel formed in the mold, and A-represents a meniscus of the molten steel formed in the mold.
Detailed Description
Method for controlling vibration mark defect of continuous casting slab
Firstly, a continuous casting billet oscillation mark forming mechanism based on a solidification hook theory is as follows:
there are several views on the mechanism of cast slab chatter mark formation: the fracture and the healing of the primary blank shell, the contact welding of the secondary meniscus, the bending and the folding of the primary blank shell, the rupture, the overflow and the condensation of the primary blank shell of the meniscus and the like.
Based on the casting blank oscillation mark forming mechanism of the traditional theory such as fracture healing, the oscillation mark forming is considered to be divided into 3 steps, as shown in the attached figure 1: (1) when the upward movement speed of the crystallizer is greater than the pulling speed and the crystallizer is in the positive slipping period, the speed difference between the blank shell and the crystallizer is the largest, liquid slag in the air gap is extruded into a meniscus slag layer, and a slag ring protrudes out of the slag layer, wherein the state of the slag ring is from 1 state → 2 state in the figure 1;
(2) when the downward movement speed of the crystallizer is greater than the pulling speed of the casting blank and is in the negative slip period, liquid slag is pumped into a gap between the blank shell and the wall of the crystallizer to play a role in lubrication, and the pressure of a slag ring forces the meniscus blank shell to bend inwards to form a vibration mark, wherein the state of the meniscus blank shell is from 3 state → 4 state in the figure 1;
(3) the extrusion force of the slag ring disappears the hydrostatic pressure of the molten steel, and the edge of the meniscus primary blank shell is pushed to the slag ring, 5 in figure 1. This mutual movement continues until the end of the oscillation cycle, whereby oscillation marks are formed on the surface of the cast strand.
The method for controlling the vibration mark defect of the continuous casting slab is based on a solidification hook theory, and the mechanism of the formation of the vibration mark of the continuous casting slab of the solidification hook theory is considered as follows: the formation of the vibration marks on the surface of the casting blank is caused by the periodic hook appearance of a primary blank shell and the supplement of new molten steel, and is caused by the interfacial tension between the covering slag and the molten steel and the vibration of a crystallizer; as shown in fig. 2.
The mechanism of continuous casting billet chatter mark formation based on the solidification hook theory is proposed in the foreign 20 th century and 80 th century, but the 'fracture healing concept' is continuously used in the continuous casting world and continuous casting professional books in China.
Secondly, a continuous casting billet vibration mark control measure based on a solidification hook theory is as follows:
as shown in fig. 2, in the continuous casting process, the initially solidified shell is subjected to the combined action of the initial solidification condition of the molten steel in the mold, the interfacial tension between the mold flux and the molten steel, the dynamic friction force generated by the vibration of the mold, the gravity and the like. Therefore, the formation of the chatter marks of the cast slab is closely related to the solidification hooks at the meniscus of the cast slab.
The initial solidification condition of the crystallizer molten steel is closely related to the superheat degree of the molten steel, the casting machine pulling speed and the cooling strength of the crystallizer; the steel slag interfacial tension is closely related to the physical and chemical properties of the molten steel and the liquid protective slag; the dynamic friction force generated by the vibration of the crystallizer is closely related to the vibration state of the crystallizer. Therefore, the method adopts the following control process.
1. Controlling initial solidification conditions of molten steel of a crystallizer:
(1) high superheat degree of molten steel: high superheat is beneficial to controlling the length of a solidification groove, improving the fluidity of molten steel and floating impurities, but too high can cause the initial billet shell to be too thin. Therefore, the superheat degree of the molten steel in the tundish is controlled to be 25-40 ℃.
(2) High drawing speed in the casting machine: high caster pull rates are also advantageous for controlling solidification channel length and mold flux, but too high a pull rate can also result in an initial billet shell that is too thin. Therefore, the casting machine pulling speed is controlled to be 1.2-1.8 m/min.
(3) Weak cooling strength of the crystallizer: the low mold cooling strength is also advantageous in controlling the solidification trough length and the mold flux, but too high results in too thin an initial shell. Therefore, the reasonable cooling intensity of the crystallizer is kept, namely the flow velocity of cooling water of the crystallizer is 5-8 m/s.
2. Controlling the interfacial tension of the steel slag:
(1) physical and chemical properties of molten steel: the depth of the vibration mark of the casting blank is closely customary with the carbon equivalent of the steel grade, wherein the calculation relation of the carbon equivalent of the steel grade is as follows: ceq [% C ] +0.02 [% Mn ] +0.023 [% Ni ] +0.0414 [% P ] +0.003 [% Cu ] +0.7 [% N ] -0.037 [% Si ] -0.0189 [% Mo ] -0.7 [% S ] -0.0254 [% Cr ] -0.0276 [% Ti ]; the component content in the formula is mass content.
The carbon equivalent of the steel grade is used to illustrate the effect of other elements in the steel on the initial solidification. The Ceq is 0.1-0.2% of steel grade, the initial solidification shrinkage is large, and the depth of the vibration mark is deep. The chatter mark is most noticeable in the range of 0.12% carbon equivalent Ceq, because a peritectic reaction occurs and an unstable initial solidification phenomenon occurs.
(2) The physical and chemical properties of the liquid mold flux are as follows: among the physical and chemical properties of the mold flux, the influence of viscosity on the formation of vibration marks on the surface of a casting blank is most direct. The consumption of the mold flux is reduced along with the increase of the viscosity, and simultaneously the fluidity of the mold flux becomes poor, so that the width of the mold flux path is relatively widened, the pressure of the mold flux path is reduced, and the vibration mark is lightened. From the viewpoint of heat transfer, the mold flux has an increased viscosity and a reduced heat transfer ability, which is the same as the effect of the weak cooling of the mold analyzed previously. However, as the viscosity increases, the fluidity of the mold flux deteriorates, the consumption of the mold flux decreases, lubrication between the wall of the mold and the shell is not facilitated, and the shell is easily adhered. Therefore, the viscosity of the crystallizer protection slag is controlled to be 0.15-0.35 Pa.S.
3. Controlling the vibration state of the crystallizer: the casting blank vibration mark is generated in the negative slip period, and the longer the negative slip time is, the deeper the vibration mark depth is, so the length of the negative slip time is controlled, and the shape of the vibration mark can be effectively controlled. The smaller the negative slip time is, the shallower the vibration mark is, and the larger the consumption of the covering slag is; the unification of reducing vibration marks and increasing the consumption of the covering slag can be realized.
However, in the sinusoidal oscillation, the negative slip time is reduced only by reducing the amplitude or increasing the frequency, which reduces the consumption of mold flux and increases the friction between the shell and the inner wall of the mold, resulting in the sticking of the shell.
Therefore, the non-sinusoidal vibration technology of the crystallizer is adopted, the negative sliding time is reduced, and the positive sliding time is increased. The consumption of the covering slag is increased, the frictional resistance of the crystallizer is reduced, so that the vibration mark on the casting blank is more regular, the depth of the vibration mark is reduced, and the surface quality of the casting blank is good.
Maximum acceleration a of 4m/s allowed according to vibration 2 The vibration parameters are set so as to ensure that the horizontal swing error of the crystallizer is within an allowable range when the crystallizer vibrates up and down.
The determination of the crystallizer vibration parameters of a specific steel grade is also matched with the steel grade characteristics: the high pulling speed is insensitive to surface defects, the high vibration frequency and the small amplitude vibration are mainly used for improving the lubrication between the crystallizer and the casting blank; and peritectic and medium-high carbon steel grades sensitive to surface defects with low pulling speed vibrate at low vibration frequency and large amplitude, so that the consumption of the covering slag is promoted.
Therefore, the crystallizer vibration in the method adopts non-sinusoidal vibration, and the control parameters are as follows: the amplitude h of the crystallizer is 4-12 mm; the frequency f of the crystallizer is 110-180 cpm; negative slip time t at steady state pouring NF 0.10-0.15 s; negative slip speed ratio NS in steady state pouring F 30 to 40 percent; the product h & f of the vibration stroke h and the vibration frequency f during steady-state pouring is 600-1300; waveform skewness alpha of non-sinusoidal vibration f ＝20％～30％。
The invention is further illustrated by the following examples.
Example 1: the method for controlling the vibration mark defect of the continuous casting slab adopts the following specific process.
(1) A certain factory produces continuous casting slabs with the specification of 230 x 1900mm, and steel grade low-carbon tin plates, and the main components are shown in the following table 1.
Table 1: low carbon tin plate principal ingredients (wt)
| C/％ | Si/％ | Mn/％ | P/％ | S/％ | Al/％ |
| 0.035 | 0 | 0.2 | 0.015 | 0.01 | 0.03 |
In table 1, the balance is Fe and inevitable impurities.
(2) The calculation formula of the carbon equivalent of the steel grade influencing the depth of the vibration mark of the casting blank is as follows: ceq [% C ] +0.02 [% Mn ] +0.023 [% Ni ] +0.0414 [% P ] +0.003 [% Cu ] +0.7 [% N ] -0.037 [% Si ] -0.0189 [% Mo ] -0.7 [% S ] -0.0254 [% Cr ] -0.0276 [% Ti ] -, 0.035+0.02 [% 0.2+0.0414 [% 0.015-0.7 [% 0.01 ═ 0.033, which is a crack insensitive low carbon steel.
(3) The crystallizer adopts non-sinusoidal vibration, and the vibration parameters are shown in table 2.
Table 2: non-sinusoidal oscillation parameter of crystallizer
Wherein, through calculation, the following results are obtained: the amplitude h is C1+ C2 x Vc is 4.3-7.0 mm; the vibration frequency f is C3+ C4 Vc 167-178 cpm; non-sinusoidal waveform skew rate alpha f ＝2(C6-0.5)*100％＝20％；
Non-sinusoidal oscillation negative slip time:
negative slip time t at steady state pouring NF ＝0.11S；
Non-sinusoidal oscillation negative slip speed ratio:
negative slip speed ratio NS in steady state pouring F ＝34～40％；
Product of vibration stroke h and vibration frequency f during steady state pouring: h and f are 952 to 1169.
(4) Controlling initial solidification conditions of molten steel of a crystallizer: the superheat degree of the molten steel of the tundish is 35 ℃; the casting machine has a casting speed of 1.6 m/min; the cooling intensity of the crystallizer, i.e. the flow rate of the cooling water of the crystallizer, is kept low at 7.5 m/s.
(5) Controlling the interfacial tension of the steel slag: the viscosity of the crystallizer casting powder is 0.35 Pa.S.
After the control measures are taken, the vibration mark depth of the continuous casting slab is reduced from 3.5mm to below 1.5mm by statistics to reach more than 95%, and the production requirements of casting blank quality and hot charging are met.
Example 2: the method for controlling the vibration mark defect of the continuous casting slab adopts the following specific process.
(1) A plant produces a continuous cast slab, 230 x 1900mm specification, steel grade steel for oil line, having the following major ingredients in Table 3.
Table 3: petroleum pipeline steel main component (wt)
| C/％ | Si/％ | Mn/％ | P/％ | S/％ | Al/％ | Nb/％ | Ti/％ |
| 0.075 | 0.15 | 1.15 | 0.015 | 0.006 | 0.02 | 0.02 | 0.015 |
In table 2, the balance is Fe and inevitable impurities.
(2) The calculation formula of the carbon equivalent of the steel grade influencing the depth of the vibration mark of the casting blank is as follows: ceq [% C ] +0.02 [% Mn ] +0.023 [% Ni ] +0.0414 [% P ] +0.003 [% Cu ] +0.7 [% N ] -0.037 [% Si ] -0.0189 [% Mo ] -0.7 [% S ] -0.0254 [% Cr ] -0.0276 [% Ti ] -, 0.075+0.02 [% 1.15+0.0414 [% 0.015-0.7 [% 0.006-0.037 [% 0.15-0.0276 ═ 0.015 [% 0.088, belonging to low alloy steel with insensitive surface cracks.
(3) The crystallizer adopts non-sinusoidal vibration, and the vibration parameters are shown in a table 4.
Table 4: non-sinusoidal oscillation parameter of crystallizer
Wherein, through calculation, the following results are obtained: the amplitude h is C1+ C2 x Vc is 4.1-7.4 mm; the vibration frequency f is C3+ C4 Vc 157-168 cpm; non-sinusoidal waveform skew rate alpha f 2(C6-0.5) × 100% ═ 30%; negative slip time t at steady state pouring NF 0.10S; negative slip speed ratio NS in steady state pouring F 34-40%; product of vibration stroke h and vibration frequency f during steady state pouring: h and f are 689-1162.
(4) Controlling initial solidification conditions of molten steel of a crystallizer: the superheat degree of the molten steel of the tundish is 30 ℃; the casting machine has a casting speed of 1.3 m/min; the cooling intensity of the crystallizer is kept low, namely the flow velocity of cooling water of the crystallizer is 6.5 m/s.
(5) Controlling the interfacial tension of the steel slag: the viscosity of the mold flux was 0.25 pas.
After the control measures are taken, the vibration mark depth of the continuous casting slab is reduced from 3.5mm to below 2.0mm by statistics to reach more than 98%, and the production requirements of casting blank quality and hot charging are met.
Example 3: the method for controlling the vibration mark defect of the continuous casting slab adopts the following specific process.
(1) A certain plant produces continuous casting slabs with specification of 230 x 1900mm, peritectic steel for mechanical structure of steel grades, and the main components are shown in the following table 5.
Table 5: peritectic steel for mechanical structure main component (wt)
| C/％ | Si/％ | Mn/％ | P/％ | S/％ | Al/％ |
| 0.16 | 0 | 0.37 | 0.02 | 0.01 | 0.025 |
In table 3, the balance is Fe and inevitable impurities.
(2) The calculation formula of the carbon equivalent of the steel grade influencing the depth of the vibration mark of the casting blank is as follows: ceq [% C ] +0.02 [% Mn ] +0.023 [% Ni ] +0.0414 [% P ] +0.003 [% Cu ] +0.7 [% N ] -0.037 [% Si ] -0.0189 [% Mo ] -0.7 [% S ] -0.0254 [% Cr ] -0.0276 [% Ti ] -, 0.16+0.02 [% 0.37+0.0414 [% 0.02-0.7 ═ 0.01 ═ 0.16, and belongs to oscillation mark sensitive peritectic steel.
(3) The crystallizer adopts non-sinusoidal vibration, and the vibration parameters are shown in a table 6.
Table 6: non-sinusoidal oscillation parameter of crystallizer
Wherein, through calculation, the following results are obtained: the amplitude h is C1+ C2 x Vc is 5.0-8.8 mm; the vibration frequency f is C3+ C4 Vc 138-155 cpm; non-sinusoidal waveform skew rate alpha f 2(C6-0.5) × 100% ═ 24%; negative slip time t at steady state pouring NF 0.13S; negative slip speed ratio NS in steady state pouring F 34-40%; product of vibration stroke h and vibration frequency f during steady state pouring: and h and f are 775-1215.
(4) Controlling initial solidification conditions of molten steel of a crystallizer: the superheat degree of the molten steel of the tundish is 25 ℃; the casting machine has a casting speed of 1.5 m/min; the cooling intensity of the crystallizer, i.e. the flow rate of the cooling water of the crystallizer, is kept low at 5.5 m/s.
(5) Controlling the interfacial tension of the steel slag: the viscosity of the mold flux was 0.18 pas.
After the control measures are taken, the vibration mark depth of the continuous casting slab is reduced from 3.5mm to below 2.0mm by statistics to reach more than 98.5 percent, and the production requirements of casting blank quality and hot charging are met.
Example 4: the method for controlling the vibration mark defect of the continuous casting slab adopts the following specific process.
(1) A certain factory produces continuous casting slabs with specification of 230 x 1900mm, steel grade high carbon tool steel, and the main components are shown in the following table 7.
Table 7: high carbon tool steel Main component (wt)
| C/％ | Si/％ | Mn/％ | P/％ | S/％ | Al/％ |
| 0.65 | 0.25 | 1.0 | 0.015 | 0.003 | 0.025 |
In table 4, the balance is Fe and inevitable impurities.
(2) The calculation formula of the carbon equivalent of the steel grade influencing the depth of the vibration mark of the casting blank is as follows: ceq [% C ] +0.02 [% Mn ] +0.023 [% Ni ] +0.0414 [% P ] +0.003 [% Cu ] +0.7 [% N ] -0.037 [% Si ] -0.0189 [% Mo ] -0.7 [% S ] -0.0254 [% Cr ] -0.0276 [% Ti ] -, 0.65+0.02 [% 1.0+0.0414 [% 0.015-0.7 [% 0.003 ═ 0.67, belonging to high carbon steel insensitive to vibration mark.
(3) The crystallizer adopts non-sinusoidal vibration, and the vibration parameters are shown in a table 8.
Table 8: non-sinusoidal oscillation parameter of crystallizer
Wherein, through calculation, the following results are obtained: the amplitude h is C1+ C2 x Vc is 5.6-8.9 mm; the vibration frequency f is C3+ C4 Vc 117-128 cpm; non-sinusoidal waveform skew rate alpha f 2(C6-0.5) × 100% ═ 26%; negative slip time t at steady state pouring NF 0.14S; negative slip speed ratio NS during steady state pouring F 31-40%; product of vibration stroke h and vibration frequency f during steady state pouring: h and f are 717 to 1041.
(4) Controlling initial solidification conditions of molten steel of a crystallizer: the superheat degree of the molten steel of the tundish is 20 ℃; the casting machine casting speed is 1.2 m/min; the cooling intensity of the crystallizer, i.e. the flow rate of the cooling water of the crystallizer, is kept low at 6 m/s.
(5) Controlling the interfacial tension of the steel slag: the viscosity of the crystallizer casting powder is 0.20 Pa.S.
After the control measures are taken, the vibration mark depth of the continuous casting slab is reduced from 3.5mm to below 2.5mm by statistics to reach more than 99%, and the production requirements of casting blank quality and hot charging are met.
Example 5: the method for controlling the vibration mark defect of the continuous casting slab adopts the following specific process.
(1) A certain factory produces continuous casting plate blanks with the specification of 230 x 1900mm, and steel type low-carbon tin plates; belongs to low-carbon steel insensitive to cracks.
(2) The crystallizer adopts non-sinusoidal vibration, wherein: the amplitude h is 4.0-7.6 mm; the vibration frequency f is 142-155 cpm; non-sinusoidal waveform skew rate alpha f 22%; negative slip time t at steady state pouring NF 0.15S; negative slip speed ratio NS in steady state pouring F 34-40%; product of vibration stroke h and vibration frequency f during steady state pouring: h and f are 987-1204; acceleration a is less than or equal to 4m/s during vibration 2 。
(3) Controlling initial solidification conditions of molten steel of a crystallizer: the superheat degree of the molten steel in the tundish is 40 ℃; the casting machine casting speed is 1.7 m/min; the crystallizer cooling intensity, i.e. the crystallizer cooling water flow rate, is kept low at 8 m/s.
(4) Controlling the interfacial tension of the steel slag: the viscosity of the crystallizer casting powder is 0.30 Pa.S.
After the control measures are taken, the vibration mark depth of the continuous casting slab is reduced from 3.5mm to below 1.5mm by statistics to reach more than 97 percent, and the production requirements of casting blank quality and hot charging are met.
Example 6: the method for controlling the vibration mark defect of the continuous casting slab adopts the following specific process.
(1) A certain factory produces continuous casting slabs with the specification of 230 mm 1900mm, steel grade and steel for petroleum pipelines; belongs to low alloy steel with insensitive surface cracks.
(2) The crystallizer adopts non-sinusoidal vibration, wherein: the amplitude h is 4.6-8.0 mm; the vibration frequency f is 166-180 cpm; non-sinusoidal waveform skew rate alpha f 27 percent; negative slip time t at steady state pouring NF 0.12S; negative slip speed ratio NS in steady state pouring F 31-40%; product of vibration stroke h and vibration frequency f during steady state pouring: h and f are 937-1300; acceleration a is less than or equal to 4m/s during vibration 2 。
(3) Controlling initial solidification conditions of molten steel of a crystallizer: the superheat degree of molten steel in the tundish is 28 ℃; the casting machine has a casting speed of 1.8 m/min; the cooling intensity of the crystallizer, namely the flow speed of cooling water of the crystallizer is kept low to be 7 m/s.
(4) Controlling the interfacial tension of the steel slag: the viscosity of the mold flux was 0.22 pas.
After the control measures are taken, the vibration mark depth of the continuous casting slab is reduced from 3.5mm to below 2.0mm by statistics to reach more than 98.2 percent, and the production requirements of casting blank quality and hot charging are met.
Example 7: the method for controlling the vibration mark defect of the continuous casting slab adopts the following specific process.
(1) A certain factory produces continuous casting slabs with specification of 230 x 1900mm, peritectic steel for steel grade mechanical structures; belongs to peritectic steel sensitive to vibration marks.
(2) The crystallizer adopts non-sinusoidal vibration, wherein: the amplitude h is 8.7-12.0 mm; the vibration frequency f is 129-148 cpm; non-sinusoidal waveform skew rate alpha f 25 percent; negative slip time t at steady state pouring NF 0.12S; negative slip speed ratio NS in steady state pouring F 34-40%; product of vibration stroke h and vibration frequency f during steady state pouring: h and f are 600-873; acceleration a is less than or equal to 4m/s during vibration 2 。
(3) Controlling initial solidification conditions of molten steel of a crystallizer: the superheat degree of the molten steel of the tundish is 32 ℃; the casting machine has a casting speed of 1.4 m/min; the cooling intensity of the crystallizer, i.e. the flow rate of the cooling water of the crystallizer, is kept low at 6.5 m/s.
(4) Controlling the interfacial tension of the steel slag: the viscosity of the crystallizer casting powder is 0.15 Pa.S.
After the control measures are taken, the vibration mark depth of the continuous casting slab is reduced from 3.5mm to below 2.0mm by statistics to reach more than 98%, and the production requirements of casting blank quality and hot charging are met.
Example 8: the method for controlling the vibration mark defect of the continuous casting slab adopts the following specific process.
(1) Producing continuous casting plate blanks with specification of 230 x 1900mm in a certain factory, wherein the steel grade is high-carbon tool steel; belongs to high-carbon steel insensitive to vibration marks.
(2) The crystallizer adopts non-sinusoidal vibration, wherein: the amplitude h is 5.2-8.8 mm; the vibration frequency f is 110-125 cpm; non-sinusoidal waveform skew rate alpha f 28%; negative slip time t at steady state pouring NF 0.13S; negative slip during steady state pouringSpeed ratio NS F 30-38%; product of vibration stroke h and vibration frequency f during steady state pouring: h and f are 782-1115; acceleration a is less than or equal to 4m/s during vibration 2 。
(3) Controlling initial solidification conditions of molten steel of a crystallizer: the superheat degree of the molten steel in the tundish is 20 ℃; the casting machine has a casting speed of 1.5 m/min; the cooling intensity of the crystallizer, namely the flow speed of cooling water of the crystallizer is kept low at 5 m/s.
(4) Controlling the interfacial tension of the steel slag: the viscosity of the mold flux was 0.38 pas.
After the control measures are taken, the vibration mark depth of the continuous casting slab is reduced from 3.5mm to below 2.5mm by statistics to reach more than 98.5 percent, and the production requirements of casting blank quality and hot charging are met.
Claims (5)
1. A method for controlling the vibration mark defect of a continuous casting slab is characterized by comprising the following steps: in the slab continuous casting process, the vibration of the crystallizer adopts non-sinusoidal vibration;
the parameters of the non-sinusoidal vibration are controlled as follows: negative slip time t NF = 0.10-0.15 s; negative slip speed ratio NS F =30% -40%; wave form deflection rate alpha f =20% -30%; the product h · f = 600-1300 of the vibration stroke h and the vibration frequency f; the amplitude h of the crystallizer is = 4-12 mm; the frequency f = 110-180 cpm of the crystallizer; acceleration a is less than or equal to 4m/s during vibration 2 。
2. The method for controlling the continuous casting slab chatter mark defects as claimed in claim 1, wherein: in the slab continuous casting process, the superheat degree of molten steel in a tundish is controlled to be 20-40 ℃.
3. The method for controlling the continuous casting slab chatter mark defects as claimed in claim 1, wherein: in the slab continuous casting process, the drawing speed of continuous casting is 1.2-1.8 m/min.
4. The method for controlling the continuous casting slab chatter mark defects as claimed in claim 1, wherein: in the slab continuous casting process, the flow speed of cooling water of the crystallizer is 5-8 m/s.
5. The method for controlling the chatter mark defects of the continuous casting slab as claimed in any one of claims 1 to 4, wherein: in the slab continuous casting process, the high viscosity of the crystallizer covering slag is 0.15-0.35 Pa.S.
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