CN115229150B - Method for controlling rail inclusions - Google Patents
Method for controlling rail inclusions Download PDFInfo
- Publication number
- CN115229150B CN115229150B CN202210787398.2A CN202210787398A CN115229150B CN 115229150 B CN115229150 B CN 115229150B CN 202210787398 A CN202210787398 A CN 202210787398A CN 115229150 B CN115229150 B CN 115229150B
- Authority
- CN
- China
- Prior art keywords
- steel rail
- casting blank
- inclusion
- inclusions
- casting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000005266 casting Methods 0.000 claims abstract description 61
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 238000007711 solidification Methods 0.000 claims abstract description 24
- 230000008023 solidification Effects 0.000 claims abstract description 24
- 238000009749 continuous casting Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000005096 rolling process Methods 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 8
- 239000011593 sulfur Substances 0.000 claims description 8
- 230000009471 action Effects 0.000 abstract description 4
- 238000012797 qualification Methods 0.000 abstract description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 16
- 150000002910 rare earth metals Chemical class 0.000 description 16
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 229910000861 Mg alloy Inorganic materials 0.000 description 6
- 230000005684 electric field Effects 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000002401 inhibitory effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000006911 nucleation Effects 0.000 description 4
- 238000010899 nucleation Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 235000011837 pasties Nutrition 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007646 directional migration Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000024121 nodulation Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a control method of rail inclusions. The method of the invention comprises the following steps: step 1, determining the steel rail inclusion sampling positions corresponding to the D1-D2 areas below the center skin of the narrow surface of a casting blank based on the steel rail inclusion sampling detection positions and in combination with the deformation condition of the casting blank during rolling into a steel rail; step 2, calculating the solidification thickness D1-D2 of the narrow surface of the casting blank based on the solidification coefficient and the drawing speed of the casting machine, wherein the specific position of the corresponding continuous casting machine is L1-L2 below the liquid surface of the casting machine; step 3, installing at least one positive electrode and at least one negative electrode between adjacent clamping rollers below the liquid level L1-L2 of the casting machine; and step 4, applying pulse current after the casting blank pulling speed is stable. According to the invention, aiming at the steel rail inclusion rating position, a casting blank corresponding region is found, high-frequency pulse current is adopted in a targeted manner, the solidified and separated MnS inclusions are inhibited from adhering to a solidified blank shell, and the steel rail inclusion rating qualification rate is improved. The invention has small action area and high frequency, and the problem that the electrode directly contacts the surface of the casting blank without considering the conduction of the clamping roller.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a control method of steel rail inclusions.
Background
Inclusions in the rail include class a sulfides, class B aluminas, class C silicates and class D spherical oxides. Wherein class a inclusions are detrimental to their transverse toughness and anisotropy, typically requiring no more than 2.5 grades. The B, C, D inclusions are hard phases, have great influence on fatigue performance, and generally are required to be no more than 1.5 grade.
MnS inclusions in a cast slab are formed during solidification. The traditional method adopts deep desulfurization or adopts calcium and magnesium treatment and other processes to reduce precipitation of MnS, but the smelting cost is greatly increased, and a large amount of smoke dust generated by modification treatment also pollutes the environment. The class A inclusions of the rolled material are often out of standard due to the polymerization growth of MnS inclusions during solidification. The class A inclusion is a control difficulty of rail manufacturers with high sulfur content of iron ore. Meanwhile, B, C, D types of impurities are captured by the solidification front after being gathered and grown in the continuous casting process, and the impurities are easy to exceed the standard.
In recent years, the use of pulse current to control inclusions has been increasingly studied. CN113718121a discloses a method for rapidly realizing super-clean smelting of rare earth magnesium alloy. Relates to the technical field of rare earth magnesium alloy purification, and can drive rare earth inclusions to sink by utilizing the strong electric driving force of high-frequency pulse current in a melt so as to realize the rapid purification of the rare earth magnesium alloy melt; the method applies high-frequency pulse current to the rare earth magnesium alloy melt to enable the rare earth inclusion to rapidly move to the interface of the rare earth magnesium alloy melt and the bottom slag under the action of strong electro-induced driving force and be captured by high-viscosity slag in the bottom slag, thereby realizing the purification purpose. The technical scheme provided by the invention is suitable for the purification process of rare earth magnesium alloy.
CN113755891a discloses a method and apparatus for purifying metal melt using a pulsed current density gradient. Relates to the technical field of metal melt purification; the method is characterized in that a non-uniform electric field with a current density gradient between 104 and 1010A/m 3 is applied to a metal melt, so that the current density difference between two ends of the same nonmetallic inclusion in the melt is large, and the electric driving force is larger, thereby realizing the directional migration of the metallic inclusion and achieving the purpose of purifying the metal melt; the non-uniform electric field is a pulse current electric field, the average current density is 102-106A/m 2, the frequency is 10Hz-50kHz, the pulse width is 1-500 mu s, the voltage is 1-36V, and the action time is 5min-24h. The technical scheme provided by the invention is suitable for the purification process of the metal melt.
CN113441695A discloses a method for removing non-oriented silicon steel inclusions. The method comprises the steps of presetting a pulse current device in a tundish, connecting an anode of the pulse current device to an upper slag weir, connecting a cathode of the pulse current device to a lower guide dam, and applying electric pulse treatment in the molten steel pouring process. According to the invention, based on the research of the molten steel flow field of the tundish, a pulse electric field is applied between the upper slag dam and the lower guide dam of the tundish, so that the molten steel area acted by the pulse electric field is enlarged, and as the molten steel flow field moves, the flow field interacts with the pulse electric field, so that fine SiO 2 and MnS inclusion collide, gather and grow more effectively in the molten steel movement process, and float up sufficiently for a sufficient time, thereby effectively removing casting blank inclusion, reducing S and O content in the casting blank, greatly improving the purity of the molten steel, and further improving the magnetic performance of a silicon steel finished product.
CN112024864a discloses a method for removing inclusions in tundish steel by using pulse current. Comprising the following steps: setting a pulse power supply, wherein the positive electrode of the pulse power supply is connected to a stopper rod in the molten steel pouring process, and the negative electrode of the pulse power supply is connected to a continuous casting nozzle; setting parameters of a pulse power supply in the casting process: 1) The current density is 0.01-3A/m 2; 2) The pulse frequency is 100-20 KHz; 3) The pulse waveform is square wave or sine wave, and the pulse duty ratio is that the negative pulse is more than or equal to 60 percent. The invention can effectively remove A-type inclusions (mainly comprising manganese sulfide) and B-type inclusions (mainly comprising aluminum oxide) in steel, and change the size and distribution form of the inclusions, thereby improving the quality of steel billets; in the continuous casting process, the tundish molten steel is treated by utilizing a pulse current technology, and nonmetallic inclusions in the steel are removed and the morphological distribution of the nonmetallic inclusions is changed through the electric effect, the stress effect and the energy effect of the pulse current produced in the molten steel, so that the purposes of purifying the molten steel and improving the quality of steel are achieved.
The above patents all promote the floating of the inclusion in the molten metal through electric pulse, and the inclusion moves into slag at the top of the molten metal, thereby achieving the purpose of removing the inclusion. However, mnS inclusions are inclusions precipitated in a solid-liquid two-phase region (pasty region) during solidification. The above 4 patents are directed to inclusion control in the metal liquid phase. The viscosity of the molten metal is small, the control difficulty of the inclusion movement is small, the viscosity of the pasty area is increased sharply, and the control difficulty of the inclusion is very large. These techniques are not applicable and new techniques are needed.
CN111906266a discloses a method for inhibiting the blockage of a molten rare earth steel pouring nozzle by using pulse current. The method comprises the steps of inserting an electrode into rare earth molten steel, applying pulse current to the electrode by a power supply device, interfering the erosion reaction of the interface between the inner wall of the water gap and the rare earth molten steel by the pulse current, improving the corrosion resistance of the inner wall of the water gap to the rare earth molten steel, and further preventing inclusions in the molten steel from adhering to the inner wall of the water gap. Aiming at the problems that the molten steel in the smelting and casting of the rare earth steel corrodes a water gap and the water gap is blocked and nodulation is caused by the adhesion of rare earth inclusions, the invention provides a method for inhibiting the blocking of the molten steel casting water gap by using pulse current so as to stabilize the smelting and continuous casting process of the rare earth steel and improve the quality of continuous casting billets. The technology is used for inhibiting the adhesion of inclusions to a submerged nozzle through electric pulses so as to stabilize the smelting and continuous casting process of rare earth steel.
CN105583382a discloses a method for inhibiting casting blank inclusion segregation by using pulse current. Specifically, pulse current with the frequency of 1 Hz-105 Hz and the current density of 1.0 A.m -2～105A·cm-2 is applied between two opposite clamping sticks behind the continuous casting crystallizer, so that the nucleation rate and the nucleation speed of tiny sulfides and carbides formed by sulfur, carbon and other easily segregated elements in the solidification process are improved, and the casting blank segregation is inhibited. The technical principle is to promote the nucleation rate and nucleation speed of the inclusions and achieve the miniaturization and the homogenization of the distribution of the inclusions. The method has the advantages of low treatment cost, simple and convenient operation, obvious effect of inhibiting casting blank segregation and the like. The patent connects the electrode to the clamping roller, requires the clamping roller to be insulated, has large transformation difficulty and has small effect on casting blank treatment. In addition, the technology has the advantages that electric pulses are required to be applied to all positions from the outlet of the crystallizer to the solidification end point, the implementation difficulty is high, and the pertinence is low.
Disclosure of Invention
According to the technical problem, the invention provides a control method of rail inclusions, which is characterized in that the positions of the solidified MnS inclusions are controlled so as not to be remained in the 10-15 mm area of the rail head of the rail.
The invention adopts the following technical means:
A control method of rail inclusions comprises the following steps:
Step 1, determining the steel rail inclusion sampling positions corresponding to the D1-D2 areas below the center skin of the narrow surface of a casting blank based on the steel rail inclusion sampling detection positions and in combination with the deformation condition of the casting blank during rolling into a steel rail;
Step 2, calculating the specific positions of the continuous casting machine to be L1-L2 below the liquid surface of the casting machine when the solidification thickness of the narrow surface of the casting blank is D1-D2 based on the solidification coefficient and the drawing speed of the casting machine;
Step 3, installing at least one positive electrode and at least one negative electrode between adjacent clamping rollers below the liquid level L1-L2 of the casting machine;
and step 4, applying pulse current after the casting blank pulling speed is stable.
Further, the inclusion sampling detection position is a region of 10-15 mm below the tread of the steel rail.
Further, in the step2, a formula l= (D/K) 2 v is adopted to calculate the solidification thickness of the narrow surface of the casting blank, where L is the corresponding specific position of the continuous casting machine, D is the solidification thickness of the narrow surface of the casting blank, K is the solidification coefficient of the casting machine, and v is the drawing speed.
Further, when a plurality of positive and negative electrodes are used, the positive and negative electrodes are arranged in parallel.
Further, in the step 4, the frequency of the pulse current is 5000-10000 Hz, the current is 100-200A, and the voltage is 20-30V.
Further, in the step 4, a duty ratio of the pulse current is 50 to 60%.
According to the application, aiming at the steel rail inclusion rating position, a casting blank corresponding region is found, high-frequency pulse current is adopted in a targeted manner, the solidified and separated MnS inclusions are restrained from adhering to a solidified blank shell (solid phase region), and the steel rail inclusion rating qualification rate is improved. The application has small action area and high frequency, and the problem that the electrode directly contacts the surface of the casting blank without considering the conduction of the clamping roller. The application realizes the control of inclusions by controlling the inclusions to move to the area with little influence on the quality of the steel rail in the continuous casting.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic diagram of an apparatus used in the present invention.
FIG. 2 is a graph of a test flow inclusion rating in an embodiment of the invention.
FIG. 3 is a graph of comparative run inclusion ratings in an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
According to the steel rail standard, the inclusion sampling detection position is 10-15 mm below the tread of the steel rail, and the position has a certain corresponding relation with the casting blank, so that the inclusion movement behavior in the corresponding area of the casting blank is controlled, the inclusion aggregation length is avoided, and the inclusion rating can be reduced. The pulse current can generate current density gradient at the solidification front edge, so that the inclusions are driven to move towards the liquid phase, and the aggregation growth of the solidified and separated inclusions is reduced.
The embodiment discloses a control method of rail inclusions, which comprises the following steps:
In this example, for U75V rail, the sulfur content is 0.006%,
The casting blank is divided into a wide surface and a narrow surface, and in the embodiment, the corresponding position of the 10-15 mm region below the tread of the steel rail and the casting blank is determined to be a region with the center of 40-60 mm of the narrow surface of the casting blank.
According to the solidification coefficient K=29 mm/min 0.5 and the pulling speed 0.67m/min, when the solidification thickness D=40-60 mm of the narrow surface of the casting blank is calculated by adopting the formula L= (D/K) 2 x v, the corresponding specific position of the continuous casting machine is L=1.3 m-2.9 m below the liquid level.
As shown in figure 1, a plurality of positive electrodes and negative electrodes are arranged in parallel at the centers of two narrow surfaces of a casting blank in a gap between clamping rolls of 1.3 m-2.9 m of a casting machine, and positive electrodes and negative electrodes are arranged on opposite sides in decibels;
The frequency of the applied pulse current is 5000-10000 Hz, the current is 100-200A, and the voltage is 20-30V.
The duty cycle of the applied pulse current is 50-60%.
As a specific embodiment, after the casting blank pulling speed is stabilized to 0.67m/min, square wave electric pulse is applied to the 1# strand of the billet continuous casting machine. In this embodiment, the frequency is 5000Hz, the current is 150A, the voltage is 24V, and the duty ratio is 60%;
As can be seen from the figure 2, the class A inclusion rating of the 1# flow heavy rail rolled material is 1.5, and the class B and C, D inclusions are 0to 0.5; as can be seen from FIG. 3, the flow rate without electric pulse is class A grade 2.5, and B, C, D inclusions are all grade 0-0.5.
Example 2
The embodiment aims at the U75V steel rail, the sulfur content is 0.010 percent, and the method comprises the following steps:
and determining the corresponding position of the 10-15 mm region under the tread of the steel rail and the casting blank as the 35-55 mm region in the center of the narrow surface of the casting blank.
According to the solidification coefficient K=29 mm/min 0.5 and the pulling speed 0.67m/min, when the solidification thickness D=35-55 mm of the narrow surface of the casting blank is calculated by adopting the formula L= (D/K) 2 x v, the corresponding specific position of the continuous casting machine is L=1.0 m-2.4 m below the liquid level.
A plurality of positive electrode brushes and negative electrode brushes are arranged in parallel at the centers of two narrow surfaces of a casting blank in a gap between clamping rollers of 1.0 m-2.4 m of the casting machine;
And after the casting blank pulling speed is stabilized to 0.67m/min, square wave electric pulse is applied to the 1# flow of the billet continuous casting machine. In this embodiment, the frequency is 10000Hz, the current is 200A, the voltage is 30V, and the duty ratio is 60%;
through detection, class A inclusion rating of the 1# flow heavy rail rolled material is 2.0, and class B and C, D inclusions are 0-0.5; the flow rate without electric pulse is class A3.0 level, and B, C, D inclusions are all 0-0.5 level.
Example 3
The embodiment aims at the U75V steel rail, the sulfur content is 0.008 percent, and the method comprises the following steps:
And determining the corresponding position of the 10-15 mm region under the tread of the steel rail and the casting blank as the 35-60 mm region in the center of the narrow surface of the casting blank.
According to the solidification coefficient K=30mm/min 0.5 and the pulling speed 0.7m/min, when the solidification thickness D=40-60 mm of the narrow surface of the casting blank is calculated by adopting the formula L= (D/K) 2 x v, the corresponding specific position of the continuous casting machine is L=1.0 m-2.8 m below the liquid level.
A plurality of positive electrode brushes and negative electrode brushes are arranged in parallel at the centers of two narrow surfaces of a casting blank in a gap between clamping rollers of 1.0 m-2.8 m of the casting machine;
And after the casting blank pulling speed is stabilized to 0.67m/min, square wave electric pulse is applied to the 1# flow of the billet continuous casting machine. In this embodiment, the frequency is 8000Hz, the current is 150A, the voltage is 24V, and the duty ratio is 55%;
Through detection, class A inclusion rating of the 1# flow heavy rail rolled material is 1.5, and class B and C, D inclusions are 0-0.5; the flow rate without electric pulse is class A2.5 level, and B, C, D inclusions are all 0-0.5 level.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (3)
1. The control method of the rail inclusions is characterized by comprising the following steps:
step 1, determining the steel rail inclusion sampling positions corresponding to the areas D1-D2 of the narrow surface center skin of a casting blank based on the steel rail inclusion sampling detection positions and in combination with the deformation condition of the casting blank in the process of rolling the casting blank into the steel rail;
Step2, calculating the solidification thickness D1-D2 of the narrow surface of a casting blank by adopting a formula L= (D/K) 2 x v based on the solidification coefficient and the drawing speed of the casting machine, wherein the specific position of the corresponding continuous casting machine is L1-L2 below the liquid surface of the casting machine;
wherein L is the corresponding specific position of the continuous casting machine, D is the solidification thickness of the narrow surface of the casting blank, K is the solidification coefficient of the casting machine, and v is the pulling speed;
step 3, installing at least one positive electrode and at least one negative electrode between adjacent clamping rollers below the liquid level L1-L2 of the casting machine;
Wherein, for the U75V steel rail, the sulfur content is 0.006%, the D1-D2 value is 40-60 mm, and the L1-L2 value is 1.3-2.9 m;
Aiming at the U75V steel rail, the sulfur content is 0.010%, the D1-D2 value is 35-55 mm, and the L1-L2 value is 1.0-2.4 m;
aiming at U75V steel rails, the sulfur content is 0.008%, the D1-D2 values are 40-60 mm, and the L1-L2 values are 1.0-2.8 m;
Step 4, after the casting blank pulling speed is stable, pulse current is applied;
In the step 4, the frequency of the applied pulse current is 5000-10000 Hz, the current is 100-200A, and the voltage is 20-30V;
in the step 4, a duty ratio of pulse current is applied to be 50-60%.
2. The method for controlling steel rail inclusions according to claim 1, wherein the inclusion sampling detection position is a region 10-15 mm below a tread of the steel rail.
3. The method for controlling rail inclusions according to claim 1, wherein when a plurality of positive and negative electrodes are used, the positive and negative electrodes are arranged in parallel therebetween.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210787398.2A CN115229150B (en) | 2022-07-04 | 2022-07-04 | Method for controlling rail inclusions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210787398.2A CN115229150B (en) | 2022-07-04 | 2022-07-04 | Method for controlling rail inclusions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115229150A CN115229150A (en) | 2022-10-25 |
| CN115229150B true CN115229150B (en) | 2024-05-14 |
Family
ID=83670611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210787398.2A Active CN115229150B (en) | 2022-07-04 | 2022-07-04 | Method for controlling rail inclusions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115229150B (en) |
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1524094A (en) * | 1965-12-30 | 1968-05-10 | Concast Ag | Method and device for controlling a continuous casting plant |
| JPH09277034A (en) * | 1996-04-10 | 1997-10-28 | Nippon Steel Corp | Method for continuously casting molten metal |
| KR20000008005A (en) * | 1998-07-09 | 2000-02-07 | 이구택 | Continuous casting method in which central defect of slab decreases |
| CN1717288A (en) * | 2002-11-29 | 2006-01-04 | Abb股份有限公司 | Control system, computer program product, device and method |
| JP2006122961A (en) * | 2004-10-29 | 2006-05-18 | Nippon Steel Corp | Method and device for controlling fluidity in strand pool |
| RU65799U1 (en) * | 2006-12-05 | 2007-08-27 | Игорь Михайлович Ячиков | DEVICE FOR CONTROL CRYSTALLIZATION OF CONTINUOUS INGOT |
| CN200954541Y (en) * | 2006-09-01 | 2007-10-03 | 鞍钢集团鞍山矿业运输设备制造总厂 | Telecontrolled stepless variable-frequency speed-regulating tracting vehicle |
| KR20100078663A (en) * | 2008-12-30 | 2010-07-08 | 주식회사 포스코 | Device for continuous casting and method thereof |
| CN102046829A (en) * | 2008-05-26 | 2011-05-04 | 新日本制铁株式会社 | High-strength hot-rolled steel sheet for line pipe excellent in low-temperature toughness and ductile-fracture-stopping performance and process for producing the same |
| CN102166642A (en) * | 2010-02-26 | 2011-08-31 | 宝山钢铁股份有限公司 | Method for controlling morphologies of inclusions in cast structure of steel |
| CN102357329A (en) * | 2011-07-15 | 2012-02-22 | 攀钢集团有限公司 | Recovery technology of sintering flue gas desulphurization barren solution |
| CN202763025U (en) * | 2012-09-13 | 2013-03-06 | 上海耀秦冶金设备技术有限公司 | Tundish channel cleaning device |
| CN105583382A (en) * | 2016-03-07 | 2016-05-18 | 东北大学 | Method for suppressing casting blank inclusion segregation by means of pulse current |
| CN107229803A (en) * | 2017-06-16 | 2017-10-03 | 东北大学 | A kind of method for the strand microstructure for predicting continuous casting |
| CN111707799A (en) * | 2020-06-03 | 2020-09-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail rolling region genetic characterization method based on solidification structure region correspondence |
| CN112024864A (en) * | 2020-08-25 | 2020-12-04 | 辽宁科技大学 | Method for removing inclusions in tundish steel by using pulse current |
| CN113755891A (en) * | 2021-08-05 | 2021-12-07 | 北京科技大学 | Method and device for realizing metal melt purification by using pulse current density gradient |
-
2022
- 2022-07-04 CN CN202210787398.2A patent/CN115229150B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1524094A (en) * | 1965-12-30 | 1968-05-10 | Concast Ag | Method and device for controlling a continuous casting plant |
| JPH09277034A (en) * | 1996-04-10 | 1997-10-28 | Nippon Steel Corp | Method for continuously casting molten metal |
| KR20000008005A (en) * | 1998-07-09 | 2000-02-07 | 이구택 | Continuous casting method in which central defect of slab decreases |
| CN1717288A (en) * | 2002-11-29 | 2006-01-04 | Abb股份有限公司 | Control system, computer program product, device and method |
| JP2006122961A (en) * | 2004-10-29 | 2006-05-18 | Nippon Steel Corp | Method and device for controlling fluidity in strand pool |
| CN200954541Y (en) * | 2006-09-01 | 2007-10-03 | 鞍钢集团鞍山矿业运输设备制造总厂 | Telecontrolled stepless variable-frequency speed-regulating tracting vehicle |
| RU65799U1 (en) * | 2006-12-05 | 2007-08-27 | Игорь Михайлович Ячиков | DEVICE FOR CONTROL CRYSTALLIZATION OF CONTINUOUS INGOT |
| CN102046829A (en) * | 2008-05-26 | 2011-05-04 | 新日本制铁株式会社 | High-strength hot-rolled steel sheet for line pipe excellent in low-temperature toughness and ductile-fracture-stopping performance and process for producing the same |
| KR20100078663A (en) * | 2008-12-30 | 2010-07-08 | 주식회사 포스코 | Device for continuous casting and method thereof |
| CN102166642A (en) * | 2010-02-26 | 2011-08-31 | 宝山钢铁股份有限公司 | Method for controlling morphologies of inclusions in cast structure of steel |
| CN102357329A (en) * | 2011-07-15 | 2012-02-22 | 攀钢集团有限公司 | Recovery technology of sintering flue gas desulphurization barren solution |
| CN202763025U (en) * | 2012-09-13 | 2013-03-06 | 上海耀秦冶金设备技术有限公司 | Tundish channel cleaning device |
| CN105583382A (en) * | 2016-03-07 | 2016-05-18 | 东北大学 | Method for suppressing casting blank inclusion segregation by means of pulse current |
| CN107229803A (en) * | 2017-06-16 | 2017-10-03 | 东北大学 | A kind of method for the strand microstructure for predicting continuous casting |
| CN111707799A (en) * | 2020-06-03 | 2020-09-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Heavy rail rolling region genetic characterization method based on solidification structure region correspondence |
| CN112024864A (en) * | 2020-08-25 | 2020-12-04 | 辽宁科技大学 | Method for removing inclusions in tundish steel by using pulse current |
| CN113755891A (en) * | 2021-08-05 | 2021-12-07 | 北京科技大学 | Method and device for realizing metal melt purification by using pulse current density gradient |
Non-Patent Citations (6)
| Title |
|---|
| Microstructure and mechanical properties of Mg–Al–Zn alloy under a low-voltage pulsed magnetic field;J.W. Fu等;Materials Letters;第67卷(第1期);252-255 * |
| Microstructure refinement of AZ31 alloy solidified with pulsed magnetic field;WANG Bin等;Transactions of Nonferrous Metals Society of China;第20卷(第9期);1685-1690 * |
| 方坯凝固过程中夹杂物的运动轨迹;邓安元, 赫冀成, 贾光霖;东北大学学报(自然科学版);20001015(第05期);533-535 * |
| 脉冲电流对钢水凝固组织的影响;王建军;连铸;第22卷(第4期);704-706 * |
| 脉冲电流调控金属熔体中的非金属夹杂物;张新房等;金属学报;第56卷(第3期);257-277 * |
| 蔡开科.连铸结晶器.冶金工业出版社,2008,(第1版),第31页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115229150A (en) | 2022-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100432092B1 (en) | How to cast steel strips | |
| KR101318274B1 (en) | Martensitic stainless steels by twin roll strip casting process and manufacturing method thereof | |
| EP2106866A1 (en) | Continuous casting method of steel | |
| RU2718442C1 (en) | Continuous casting method | |
| CN104212977B (en) | A kind of containing Ti non-corrosive metal stripping electroslag remelting plate blank Ti element control method | |
| CN113441695A (en) | Method for removing non-oriented silicon steel inclusions | |
| CN108453222B (en) | A kind of minimizing preparation method of Copper-Nickel-Aluminium Alloy strip | |
| CN112024864A (en) | Method for removing inclusions in tundish steel by using pulse current | |
| CN115971438A (en) | Control method for reducing peritectic steel liquid level fluctuation | |
| TWI268820B (en) | Method for producing ultra low carbon steel slab | |
| CN115229150B (en) | Method for controlling rail inclusions | |
| JP2010082638A (en) | Method for producing continuously cast slab | |
| CN103938088B (en) | A kind of sheet billet continuous casting method of resistance alloy Cr20AlY | |
| CN110616293A (en) | Method for adding rare earth into molten steel | |
| JP5803851B2 (en) | Continuous casting method of steel containing rare earth metal | |
| CN115921828A (en) | Method for realizing uniform distribution of inclusions in molten steel solidification structure | |
| Shi et al. | Effect of mold rotation on the bifilar electroslag remelting process | |
| US3940976A (en) | Method of determining the suitability of continuously cast slabs of Al- or Al-Si-killed soft steel for producing cold rolled sheets to be tinned | |
| KR102368249B1 (en) | Continuous Casting Method, Slab Casting, and Continuous Casting Machine | |
| JP4203167B2 (en) | Continuous casting method for molten steel | |
| CN115870481A (en) | Device and method for improving impurity wettability by using pulse current | |
| CN115717210B (en) | Method for inhibiting titanium-containing steel-bonded fish phenomenon by using pulse current | |
| CN201713536U (en) | Phi 5.5mm cord yarn steel hot-finished rod production device | |
| CN110614350A (en) | Method for reducing casting residue of tundish of 2-machine 2-flow slab continuous casting machine | |
| CN1487099A (en) | Technological process of making flat spring steel for automobile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |