WO2022166569A1

WO2022166569A1 - Continuous casting machine and method having corner crack prevention function

Info

Publication number: WO2022166569A1
Application number: PCT/CN2022/072323
Authority: WO
Inventors: 郭庆涛; 唐雪峰; 潘栋; 柴明亮; 于明光; 张栋; 魏崇一; 贾吉祥
Original assignee: 鞍钢集团北京研究院有限公司
Priority date: 2021-02-05
Filing date: 2022-01-17
Publication date: 2022-08-11
Also published as: CN112974748A

Abstract

A continuous casting machine having a corner crack prevention function, the continuous casting machine comprising a plurality of rollers and an electromagnetic heating component (2), wherein the plurality of rollers are arranged in a roller column in a continuous casting direction, the roller column has a straightening section, and the electromagnetic heating component (2) is arranged upstream of the straightening section and is close to an upstream end of the straightening section. A continuous casting method having a corner crack prevention function comprises: electromagnetically heating a corner of a casting blank (1) to a preset temperature or higher just before the casting blank (1) enters a straightening section of a roller column. The continuous casting machine has a simple structure and can prevent the corners of a casting blank from cracking.

Description

Continuous casting machine and continuous casting method with corner crack prevention function

CROSS-REFERENCE TO RELATED APPLICATIONS

The present disclosure claims the priority and rights of the Chinese patent application with application number 202110163717.8 and filing date on February 05, 2021, the entire contents of the above Chinese patent application are hereby incorporated into the present disclosure by reference.

technical field

The present disclosure relates to the technical field of metallurgy, and in particular, to a continuous casting machine and a continuous casting method with a corner crack prevention function.

Background technique

In the process of steel continuous casting, molten steel goes through a series of processes such as phase transformation and crystallization. During this process, the billet shell will be subjected to thermal stress, molten steel static pressure, friction, straightening force and other forces. When these stresses are greater than the maximum stress that the shell surface can withstand, cracks will begin to develop on the slab surface. In addition, the presence of inclusions and second-phase particles will cause stress concentration in the slab, causing further extension of surface cracks. The existence of corner cracks greatly reduces the yield of cast slabs, which seriously affects the normal production and economic benefits of iron and steel plants.

SUMMARY OF THE INVENTION

The present disclosure is made based on the inventors' findings and knowledge of the following facts and problems:

In the related art, there are three obvious brittle temperature zones in the steel from the vicinity of the solidus temperature to 600 ℃, namely: the first solidification embrittlement zone, the second high temperature plastic zone and the third low temperature embrittlement zone. During the casting process, the corner cracks of the slab are closely related to the III brittle zone. For example, the III low temperature embrittlement zone can be 1000°C-600°C. When the slab enters the straightening zone, the corner and surface temperatures are mostly 1000°C. Below, that is, within the range of the III embrittlement zone. The billet at this time is very prone to corner cracks when subjected to the straightening force.

To this end, one embodiment of the present disclosure proposes a continuous casting machine with a corner crack prevention function that can prevent corner cracks in a slab by increasing the corner temperature of the slab.

A continuous casting machine with a corner crack prevention function according to at least one embodiment of the present disclosure includes a plurality of rolls and electromagnetic heating components, the plurality of rolls are arranged in a roll row along the continuous casting direction, the roll row has a straightening section, and thus The electromagnetic heating component is provided upstream of the straightening section and adjacent to the upstream end of the straightening section, and is used for electromagnetically heating the corner of the slab before entering the straightening section to a predetermined temperature or more.

According to at least one embodiment of the present disclosure, the continuous casting machine with the function of preventing corner cracking heats the corner of the slab through the electromagnetic heating component, so that the corner temperature of the slab can be increased to avoid the third brittle zone and prevent the The occurrence of corner cracking has the characteristics of simple structure, labor saving, high production efficiency and high quality of casting billet.

In some embodiments, the predetermined temperature is the upper limit temperature of the third embrittlement temperature zone of the slab.

In some embodiments, the upper limit temperature is T1, and the electromagnetic heating component heats the corner of the slab to a range of T1+20°C to T1+100°C.

In some embodiments, there are a plurality of the electromagnetic heating components, and the plurality of the electromagnetic heating components are respectively used to heat a plurality of corners of the slab.

In some embodiments, the electromagnetic heating component is an electromagnetic heating plate wound from a copper tube, and the electromagnetic heating plate is folded into an L shape adapted to the corners of the slab.

In some embodiments, the continuous casting machine with the function of preventing corner cracks further includes a cooler, the cooler has a cooling medium outlet and a cooling medium inlet, the cooling medium inlet is connected to one end of the copper pipe, so The cooling medium outlet is connected to the other end of the copper pipe.

In some embodiments, the continuous casting machine with the function of preventing corner cracks further includes a control cabinet, the control cabinet is connected to the electromagnetic heating plate, so as to provide the electromagnetic heating plate with a power supply with continuously adjustable power.

In some embodiments, the distance between the surface of the electromagnetic heating member facing the corner surface of the slab and the corner surface of the slab is 5 mm to 50 mm.

The present disclosure also proposes a continuous casting method with a function of preventing corner cracks. Before the billet enters the straightening section of the roll row, the corners of the billet are electromagnetically heated to a temperature above a predetermined temperature to prevent the billet from entering. Cracks appear at the corners.

The continuous casting method with the function of preventing corner cracks according to the embodiment of the present disclosure prevents cracks in the corners by electromagnetically heating the corners of the slab to a predetermined temperature, thereby improving the yield of the slab and reducing the production cost.

Description of drawings

FIG. 1 is a schematic structural diagram of a continuous casting machine with a corner crack prevention function according to an embodiment of the present disclosure.

FIG. 2 is a schematic structural diagram of the electromagnetic heating plate in FIG. 1 .

FIG. 3 is a top view of the electromagnetic heating plate of FIG. 2 .

FIG. 4 is a side view of the electromagnetic heating plate of FIG. 2 .

Reference number:

Slab 1, electromagnetic heating component 2, electromagnetic heating plate 21, copper tube 211, cooler 3, control cabinet 4.

Detailed ways

Embodiments of the present disclosure are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present disclosure and should not be construed as limiting the present disclosure. In the description of the present disclosure, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial, The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying the indicated devices or elements. The clamp must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present disclosure.

A continuous casting machine with a corner crack prevention function according to an embodiment of the present disclosure will be described below with reference to the accompanying drawings.

The continuous casting machine with a corner crack prevention function according to the embodiment of the present disclosure includes a plurality of rolls (not shown in the drawings) and an electromagnetic heating part 2 .

A plurality of rolls are arranged in a roll row along the continuous casting direction, and the roll row has a straightening section. The electromagnetic heating part 2 is provided upstream of the straightening section and adjacent to the upstream end of the straightening section, for electromagnetically heating the corners of the slab 1 before entering the straightening section to a predetermined temperature or more.

The electromagnetic heating component 2 can be installed at the position before the slab 1 enters the straightening section and is immediately adjacent to the upstream end of the straightening section, and the corner of the slab 1 is electromagnetically heated to a predetermined temperature before the slab 1 enters the straightening section. As described above, the temperature of the corner portion of the slab 1 is kept away from the brittleness zone III, thereby achieving the effect of preventing corner cracking of the slab 1 .

According to the continuous casting machine with the function of preventing corner cracks in the embodiment of the present disclosure, the corners of the slab 1 are heated by the electromagnetic heating component, so that the temperature of the corners of the slab 1 can be increased to avoid the third brittle zone, Preventing the occurrence of corner cracks has the characteristics of simple structure, labor saving and high production efficiency, and the electromagnetic heating method is simple to control, and the casting billet is not easy to damage the electromagnetic heating components.

In some embodiments, the predetermined temperature is the upper limit temperature of the third embrittlement temperature zone of the slab 1 .

The third embrittlement temperature zone is a range value. When setting the temperature, the upper limit temperature of the third embrittlement temperature zone of the slab 1 is taken as the predetermined temperature to ensure that the slab 1 can avoid the third embrittlement temperature zone. During the continuous casting process, according to the different steel grades of the slab 1, the III brittle temperature zone of the slab 1 is also different. The setting temperature can vary with different steel grades.

According to the continuous casting machine with the function of preventing corner cracking according to the embodiment of the present disclosure, by setting the preset temperature as the upper limit temperature of the third brittleness temperature zone, the corner heating temperature of the slab 1 can be more ensured than that of the third brittleness temperature zone. temperature zone, reducing corner cracks and improving the quality of the slab.

In some embodiments, the upper limit temperature is T1, and the electromagnetic heating part 2 heats the corner of the slab 1 to a range of T1+20°C to T1+100°C.

In the process of heating the corners of the slab 1, the corners of the slab 1 are heated to a range of 20-100°C higher than the upper limit temperature T1, so that the slab 1 does not have corner cracks, and the energy can be reduced at the same time. For example, the third brittleness temperature zone is 1000-600°C, and the corner portion of the slab 1 is heated to the range of 1020-1100°C.

In some embodiments, there are multiple electromagnetic heating components 2 , and the multiple electromagnetic heating components 2 are respectively used to heat multiple corners of the slab 1 . As shown in FIG. 1 , there are a plurality of electromagnetic heating components 2 , and they are respectively arranged at a plurality of corners of the slab 1 for correspondingly heating all the corners of the slab 1 . For example, for a continuous casting billet, four electromagnetic heating elements 2 may be provided to heat the four corners of the billet respectively.

According to the continuous casting machine with the function of preventing corner cracks in the embodiment of the present disclosure, by arranging a plurality of electromagnetic heating components 2 , the heating efficiency is higher, and the production efficiency and quality are improved.

In some embodiments, the electromagnetic heating component 2 is an electromagnetic heating plate 21 wound from a copper tube 211 , and the electromagnetic heating plate 21 is folded into an L shape adapted to the corners of the casting billet 1 .

As shown in FIG. 2-4, the copper tube 211 is wound into a disc-shaped electromagnetic heating plate 21, and the electromagnetic heating plate 21 is bent into an L shape along its diameter direction, so that the electromagnetic heating plate 21 and the corners of the slab 1 are formed. adaptation. Wherein, the wall thickness of the copper tube 211 may be 0.5mm-10mm. The diameter of the electromagnetic heating plate 21 is 50mm-300mm, so as to better heat the corners of the slab 1 . The number of turns of the electromagnetic heating plate 21 may be 1-100. The surface of the electromagnetic heating plate 21 needs to be insulated to prevent an electric shock accident. The surface of the electromagnetic heating plate 21 can be coated with an insulating coating or placed in a box.

In some embodiments, the continuous casting machine with the function of preventing corner cracks further includes a cooler 3, the cooler 3 has a cooling medium outlet and a cooling medium inlet, the cooling medium inlet is connected to one end of the copper pipe 211, and the cooling medium outlet is connected to the copper pipe The other end of 211 is connected.

As shown in Figure 1-2, since the electromagnetic heating plate 21 is located around the slab 1, the ambient temperature is high, and its own temperature is also high during the heating process, so a cooling device is required to cool it down to ensure its normal operation. The cooling medium is stored in the cooler 3, and the cooling medium flows into the copper pipe 211 through the cooling medium outlet of the cooler 3, and then flows into the cooling medium inlet of the cooler 3 through the other end of the copper pipe 211, so as to complete the operation of the electromagnetic heating plate 21. cool down.

The continuous casting machine with the corner crack prevention function according to the embodiment of the present disclosure is provided with the cooler 3 to ensure the normal operation of the electromagnetic heating plate 21 and improve the service life of the electromagnetic heating plate 21 .

In some embodiments, the continuous casting machine with the function of preventing corner cracks further includes a control cabinet 4 , and the control cabinet 4 is connected with the electromagnetic heating plate 21 to provide a continuously adjustable power supply to the electromagnetic heating plate 21 .

As shown in FIG. 1 , the control cabinet 4 is connected with the electromagnetic heating plate 21 through a circuit, and the control cabinet 4 provides the electromagnetic heating plate 21 with a power supply with continuously adjustable power to adjust the heating temperature of the electromagnetic heating plate 21 , so that the electromagnetic heating plate 21 will The corner portion of the slab 1 is heated to within the range of T1+20°C to T1+100°C, and the heating of the corner portion of the slab 1 is completed.

The continuous casting machine with the function of preventing corner cracks according to the embodiment of the present disclosure is provided with the control cabinet 4, so that the continuous casting machine can be adapted to the production of slabs of various steel grades, and has the characteristics of diversified production products.

In some embodiments, the distance between the surface of the electromagnetic heating component 2 facing the corner surface of the slab 1 and the corner surface of the slab 1 is 5 mm to 50 mm.

The electromagnetic heating part 2 is spaced apart from the corners of the slab 1, the first surface of the electromagnetic heating part 2 is opposite to the corner surface of the slab 1, and the first surface of the electromagnetic heating part 2 and the corner surface of the slab 1 are spaced apart. The distance between them is 5mm-50mm. When the distance is too small, the electromagnetic heating part 2 is easily damaged. When the distance is too large, the heating effect of the electromagnetic heating part 2 on the corner of the slab 1 is poor. The distance is When the temperature is 5 mm to 50 mm, the heating effect of the electromagnetic heating component 2 on the corner of the slab 1 is the best.

The embodiment of the present disclosure also proposes a continuous casting method with a corner crack prevention function. Before the slab 1 is about to enter the straightening section of the roll row, the corners of the slab 1 are electromagnetically heated to a predetermined temperature or higher to prevent casting Cracks appeared at the corners of the blank 1 .

According to the continuous casting method with the function of preventing corner cracks in the embodiment of the present disclosure, by electromagnetically heating the corners of the slab 1 to a predetermined temperature or higher before the straightening section of the roll row, the corners of the slab 1 avoid the first III brittle temperature zone, so as to prevent cracks at the corners, the operation steps are simple, the corner cracks can be prevented from the slab 1, the yield of the slab 1 can be improved, and the production cost can be reduced.

The third embrittlement temperature zone is a range value, and the predetermined temperature is adjusted to the upper limit temperature of the third embrittlement temperature zone, so that the slab 1 can avoid the third embrittlement temperature zone and prevent cracks in the corners of the slab 1 .

In the description of the present disclosure, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial, The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying the indicated devices or elements It must have, be constructed, and operate in a particular orientation, and therefore should not be construed as a limitation of the present disclosure.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless expressly and specifically defined otherwise.

In the present disclosure, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between the two components, unless otherwise expressly qualified. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

In the present disclosure, unless expressly stated and defined otherwise, a first feature "on" or "under" a second feature may be in direct contact with the first and second features, or indirectly through an intermediary between the first and second features touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structures, materials, or features are included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limitations of the present disclosure, and those of ordinary skill in the art may interpret the above-described embodiments within the scope of the present disclosure. Embodiments are subject to variations, modifications, substitutions and variations.

Claims

A continuous casting machine with corner crack prevention function is characterized in that, comprising:

a plurality of rolls, a plurality of the rolls are arranged in a roll row along the continuous casting direction, and the roll row has a straightening section;

an electromagnetic heating part, the electromagnetic heating part is arranged upstream of the straightening section and adjacent to the upstream end of the straightening section, and is used for electromagnetically heating the corner of the slab before entering the straightening section to a predetermined temperature above.
The continuous casting machine with a corner crack prevention function according to claim 1, wherein the predetermined temperature is an upper limit temperature of the third brittle temperature zone of the slab.
The continuous casting machine with a corner crack prevention function according to claim 2, wherein the upper limit temperature is T1, and the electromagnetic heating component heats the corner of the slab to T1+20°C to T1+ within the range of 100°C.
The continuous casting machine with a corner crack prevention function according to any one of claims 1 to 3, wherein the number of the electromagnetic heating components is plural, and the plural electromagnetic heating components are respectively used for heating the casting. corners of the blank.
The continuous casting machine with a corner crack prevention function according to any one of claims 1 to 4, wherein the electromagnetic heating component is an electromagnetic heating plate wound from a copper tube, and the electromagnetic heating plate Fold into an L shape that fits the corners of the billet.
The continuous casting machine with a corner crack prevention function according to claim 5, further comprising a cooler, the cooler has a cooling medium outlet and a cooling medium inlet, the cooling medium inlet and the copper pipe One end is connected, and the cooling medium outlet is connected with the other end of the copper pipe.
The continuous casting machine with the function of preventing corner cracks according to claim 5, further comprising a control cabinet, the control cabinet is connected with the electromagnetic heating plate, so as to provide the electromagnetic heating plate with continuously adjustable power power supply.
The continuous casting machine with a corner crack prevention function according to any one of claims 1 to 7, wherein the surface of the electromagnetic heating member facing the corner surface of the slab is different from the surface of the slab. The distance between the corner surfaces is 5mm-50mm.
A continuous casting method with a function of preventing corner cracks, which is characterized by comprising: electromagnetically heating the corners of the slab to a predetermined temperature or more before the slab enters the straightening section of the roll row, so as to prevent the Cracks appeared in the corners of the billet.
The continuous casting method with a corner crack prevention function according to claim 9, wherein the predetermined temperature is an upper limit temperature of the third brittle temperature zone of the slab.