KR102169605B1 - Thick Plate Heat Treatment Apparatus - Google Patents

Abstract

A heat treatment apparatus for a thick plate according to an exemplary embodiment of the present invention includes: a heating furnace having a charging door and an extraction door at front and rear surfaces for charging and extracting the thick plate; A cooling facility capable of cooling the thick plate extracted from the heating furnace simultaneously with extraction; A burner for heating the inner space of the heating furnace; And a skid disposed inside the heating furnace to support the thick plate, wherein the skid includes a refractory body and a skid brick placed on the refractory body and provided to contact the thick plate, and the plurality of skids It is arranged along the longitudinal direction of the thick plate to form a skid row, and a plurality of skid rows may be arranged along the width direction of the thick plate.

Description

Thick Plate Heat Treatment Apparatus}

The present invention relates to a heat treatment apparatus for a thick plate.

The hot-rolled thick plate is charged into the furnace and heated while going through an annealing step, and then passes through the steps of cooling, straightening, cutting, and pickling.

In a conventional heating furnace for heating the thick plate, a skid that supports the thick plate is disposed during operation. These skids are arranged in the longitudinal direction of the thick plate to withstand high temperature changes.

However, since the contact area between the skid and the rear plate arranged in the longitudinal direction is large, there is a problem that a large amount of contact scratches are generated and deeply generated on the surface of the rear plate in contact with the skid.

In addition, special steel grades such as super austenitic steel grades and duplex steel grades require rapid cooling, so facilities that can cool simultaneously with extraction of the thick plate must be provided. In particular, in the duplex steel grade, as the steel plate sags due to the decrease in strength at high temperatures, a heating furnace having a longitudinal skid arrangement must be applied.

The present invention is to solve the problems of the prior art as described above, and by minimizing the contact between the thick plate and the skid, it is an object of the present invention to provide a heat treatment apparatus for a thick plate capable of minimizing the depth of occurrence and skid mark defects occurring under the thick plate To do.

In addition, it aims to provide a cooling facility capable of rapid cooling with a longitudinal skid array heating furnace in order to produce special steel grades such as super austenitic steel grade and duplex steel grade.

However, the object of the present invention is not limited thereto, and even if not explicitly mentioned, the object or effect that can be grasped from the solutions or embodiments of the problems described below will be included therein.

A heat treatment apparatus for a thick plate according to an exemplary embodiment of the present invention includes: a heating furnace having a charging door and an extraction door at front and rear surfaces for charging and extracting the thick plate; A cooling facility capable of cooling the thick plate extracted from the heating furnace simultaneously with extraction; A burner for heating the inner space of the heating furnace; And a skid disposed inside the heating furnace to support the thick plate, wherein the skid includes a refractory body and a skid brick placed on the refractory body and provided to contact the thick plate, and the plurality of skids It is arranged along the longitudinal direction of the thick plate to form a skid row, and a plurality of skid rows may be arranged along the width direction of the thick plate.

The skid brick has a rectangular structure corresponding to the upper surface of the refractory body, and the upper surface has a curved surface gently protruding upward, but the center of the upper surface protrudes upward in a round shape with respect to the longitudinal direction, so that the front end and the rear end are It may be configured not to contact the thick plate.

The skid brick may be configured such that the upper surface of the skid brick protrudes upward in a round shape with a center of the upper surface relative to the width direction so that both side ends do not contact the rear plate.

The refractory body has a groove formed on an upper surface along the conveying direction of the thick plate, and the skid brick is formed by protruding a protrusion inserted into the groove on a lower surface, and the protrusion is formed along a longitudinal direction from the center of the lower surface. Can be extended.

The entire length of the refractory body constituting the skid row may be longer than the entire length of the skid brick constituting the skid row.

In the skid row, the skid brick may be disposed to have a buffer gap between adjacent skid bricks.

The skid brick and the refractory body may be made of different materials.

The skid brick may be made of heat-resistant steel metal.

A plurality of skids may be arranged along the longitudinal direction of the thick plate to form a skid row, and a plurality of skid rows may be arranged along the width direction of the thick plate.

A charging platform disposed in front of the heating furnace to charge the thick plate into the heating furnace through the charging door, and an extraction stand disposed behind the heating furnace to extract the thick plate to the outside of the heating furnace. I can.

The cooling facility includes an upper portion disposed at an upper portion of the rear plate so as to be able to move up and down with respect to the rear plate, and a lower portion disposed under the rear plate, and the upper portion and the lower portion include water as an upper surface and a lower surface of the plate. It can be configured to spray.

The present invention can provide a heat treatment device for a thick plate capable of minimizing the contact between the thick plate and the skid through the above configuration, thereby minimizing the depth of occurrence and skid mark defects occurring under the thick plate.

In addition, the present invention can provide a cooling facility capable of rapid cooling together with a longitudinal skid array heating furnace required for the production of special steel grades such as super austenitic steel grade and duplex steel grade.

The various and beneficial advantages and effects of the present invention are not limited to the above description, and will be more easily understood in the course of describing specific embodiments of the present invention.

1 is a schematic diagram of a heat treatment apparatus for a thick plate according to an exemplary embodiment of the present invention.
Figure 2 is a rear view schematically showing a cooling facility in the heat treatment apparatus for a thick plate of Figure 1;
Figure 3 is a side view schematically showing the cooling facility of Figure 2;
Figure 4 is a side view schematically showing a heating furnace in the heat treatment apparatus for a thick plate of Figure 1;
5 is a cross-sectional view schematically showing a cross-section taken along line II′ in FIG. 4.
6 is a perspective view schematically showing a skid forming a skid row in the heating furnace of FIG. 4.
7A and 7B are side and front views schematically showing a skid brick in the skid of FIG. 6, respectively.
8A and 8B are a side view and a front view schematically showing a modified example of the skid brick, respectively.
9A and 9B are side and front views schematically showing a state in which skid bricks of different shapes are used, respectively.
10A and 10B are side views schematically showing an arrangement structure of a refractory body and a skid brick in a skid row, respectively.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. However, in describing a preferred embodiment of the present invention in detail, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, the same reference numerals are used throughout the drawings for portions having similar functions and functions. In addition, in this specification, terms such as'upper','upper','upper','lower','lower','lower', and'side' are based on drawings, and are actually elements or components. May vary depending on the direction in which the is placed.

In addition, throughout the specification, when a part is said to be'connected' to another part, it is not only'directly connected', but also'indirectly connected' with another element in the middle. Include. In addition, "including" a certain component means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

1 to 5 schematically show a heat treatment apparatus for a thick plate according to an exemplary embodiment of the present invention.

1 is a schematic diagram of a heat treatment apparatus for a thick plate according to an exemplary embodiment of the present invention, FIG. 2 is a rear view schematically showing a cooling facility in the heat treatment apparatus for a thick plate of FIG. 1, and FIG. 3 is a cooling facility of FIG. It is a schematic side view. 4 is a side view schematically showing a heating furnace in the heat treatment apparatus for a thick plate of FIG. 1, and FIG. 5 is a cross-sectional view schematically showing a cross-section taken along line II′ in FIG. 4.

In the present invention, the thick plate (P) refers to a steel plate having a thickness of 4t or more, and the expression of the thick plate (P) in the following specification generally means a steel plate.

In the present invention, the longitudinal direction of the thick plate P refers to a direction along the long side of the rectangular thick plate on a plane, and the width direction refers to a direction along the short side of the rectangular thick plate on the plane.

Referring to the drawings, the heat treatment apparatus 1 for a thick plate according to the present invention includes a heating furnace 10, a cooling facility 60, a burner 20 for heating the internal space of the heating furnace 10, and the inside of the heating furnace 10. It may include a skid 30 is disposed on the back plate (P) to support.

A charging door 11 and an extraction door 12 may be provided at the front and rear of the heating furnace 10 for charging and extracting the thick plate P, respectively.

In one embodiment, a charging table 40 is disposed in front of the heating furnace 10 so that the thick plate P, which is a heat treatment target, may be charged into the heating furnace 10 through the charging door 11. In addition, the extraction stand 50 is disposed behind the heating furnace 10 to extract the heat-treated thick plate P from the heating furnace 10 through the extraction door 12. Therefore, the transfer flow of the thick plate (P) is made in the longitudinal direction, which is charged to the front of the heating furnace 10 along the charging table 40 and then extracted from the rear side of the heating furnace 10 to the extraction table 50. It is a structure in which the heating furnace 10 enters the moving path of the thick plate P.

In one embodiment, as shown in FIG. 1, a cooling facility 60 is disposed at the rear of the heating furnace 10 in connection with the extraction table 50, and the heat-treated thick plate P is extracted and immediately cooled. Make it possible.

For example, special steel grades such as super austenitic steel grade and duplex steel grade require rapid cooling, and in the present invention, cooling treatment can be performed immediately at the same time as extraction by linking the cooling facility 60 with the extraction table 50. It is possible to heat treatment for special steel grades.

2 and 3 schematically show the cooling facility viewed from the rear and the side viewed, respectively.

Referring to the drawings, the cooling facility 60 includes an upper portion 61 and a lower portion 62, the upper portion 61 is capable of lifting and lowering with respect to the thick plate (P), and the lower portion 62 is an extraction stand ( 50) It can be configured in a fixed structure. Therefore, in the case of performing cooling on the thick plate P, the upper 61 is disposed in a structure that descends through rotation to cover the thick plate P, and water sprayed from the upper 61 and lower 62 ) Through the thick plate (P) can be cooled. When cooling is completed, the upper portion 61 may be disposed in a structure to open the rear plate P by raising and lowering through rotation.

The upper part 61 is a cover covering the plurality of upper nozzles 61a together with the plurality of upper nozzles 61a and the back plate P for spraying water (W) from the top of the back plate P to the upper surface of the back plate P (61b) may be included.

Each of the upper nozzles 61a may be disposed in a width direction perpendicular to the length direction of the thick plate P, and may be spaced apart at regular intervals along the length direction of the thick plate P. A plurality of nozzle tips provided in each upper nozzle 61a may be formed to be inclined toward both sides with respect to the center of the thick plate P.

The cover 61b covers the plurality of upper nozzles 61a and the rear plate P to prevent splashing of water W sprayed to the periphery and the diffusion of water vapor generated when cooling the rear plate P to the surroundings.

The lower portion 62 may include a plurality of lower nozzles 62a for spraying water W from the lower portion of the rear plate P to the lower surface of the rear plate P.

The upper nozzle 61a and the lower nozzle 62a may be connected to the duct 63 supplying water (W).

The structure of the skid will be described in more detail with reference to FIGS. 6 to 8.

6 is a perspective view schematically showing a skid forming a skid row in the heating furnace of FIG. 4, FIGS. 7A and 7B are side and front views schematically showing a skid brick in the skid of FIG. 6, respectively, and FIGS. 8A and 8B are It is a side view and a front view schematically showing a modified example of the skid brick, respectively.

Referring to the drawings, the skid 30 is arranged in a structure extending in the longitudinal direction of the thick plate P, and a plurality of skids 30 are arranged along the longitudinal direction of the thick plate P to form a skid row SC. , A plurality of skid rows SC may be arranged along the width direction of the thick plate P. In this way, since the skid 30 is disposed to extend in the longitudinal direction of the thick plate P, it is possible to withstand a high temperature change of a heavy material (thick material 40T or more).

Referring to the drawings, the skid 30 is placed on the refractory body 31 and the refractory body 31 disposed on the bottom of the heating furnace 10 and provided to contact the thick plate P (skid brick) ( 32) may be included.

The refractory body 31 has a hexahedral structure having a substantially rectangular upper surface, and may extend in the longitudinal direction of the thick plate P. A groove 31a may be formed on the upper surface of the refractory body 31 along the conveying direction (ie, longitudinal direction) of the thick plate P.

A skid brick 32 is placed on each refractory body 31, and the skid brick 32 supports the thick plate P.

The skid brick 32 has a rectangular structure corresponding to the upper surface of the refractory body 31, and the lower surface 32_1 forms a flat plane, and the upper surface 32_2 forms a curved surface gently protruding upward, but in the longitudinal direction. As a reference, the center of the upper surface 32_2 may be configured to protrude upward in a round shape so that the front end and the rear end do not contact the rear plate P.

In addition, the skid brick 32 is formed by protruding a protrusion 32a inserted into the groove 31a of the refractory body 31 on the lower surface 32_1, and the protrusion 32a is formed in the longitudinal direction from the center of the lower surface 32_1 It may be provided in a structure extending along the. Accordingly, the skid brick 32 can be prevented from being separated in the width direction of the refractory body 31 in a state in which the protrusion 32a is inserted into the groove 31a by being placed on the upper surface of the refractory body 31.

The skid brick 32 may be made of a material different from that of the refractory body 31. In one embodiment, the skid brick 32 may be made of a heat-resistant steel metal. However, the material of the skid brick 32 is not limited thereto.

8A and 8B show a modified example of the skid brick 33.

As shown in the drawing, the skid brick 33 has a rectangular structure corresponding to the upper surface of the refractory body 31, the lower surface 33_1 forms a flat plane, and the upper surface 33_2 has a curved surface gently protruding upward. However, the center of the upper surface (33_2) protrudes upward in a round shape based on the longitudinal direction, so that the front and rear ends do not contact the rear plate (P), and the center of the upper surface (33_2) is rounded upward in the width direction. It may be configured to protrude so that both side ends do not contact the back plate (P).

In addition, a protrusion 33a inserted into the groove 31a of the refractory body 31 may protrude from the lower surface 33_1 to be formed.

During heating in a conventional heating furnace, a part that contacts the skid may have a different temperature from that of other parts, and a scratch mark may occur at the contact part of the thick plate due to contact with the skid, thereby damaging the thick plate. In the embodiment of the present invention, since the thick plate P is supported by the skid bricks 32 and 33, the contact area with the thick plate P can be reduced, thereby reducing the damage area caused by contact, and heating the thick plate P Is advantageous to

In particular, since the contact part of the skid bricks 32 and 33 with the rear plate P forms a curved surface of a structure protruding in a round shape, even if a contact occurs, the rear plate P slides along the curved surface to avoid impact. Thus, there is an advantage of preventing the occurrence of scratch defects.

On the other hand, in the case of a change in the longitudinal direction that mainly increases when the thick plate P is expanded by heating, it is relatively larger in the outer portion of the thick plate P, not in the central part, so in one embodiment of the present invention, the thick plate ( Depending on the position of P), skid bricks (32, 33) having different shapes can be used. For example, the skid brick 32 shown in FIGS. 7A and 7B (hereinafter referred to as'the first type skid brick') and the skid brick 33 shown in FIGS. 8A and 8B (hereinafter, the'second type (Referred to as'skid bricks') can be divided and placed according to their location.

9A and 9B schematically show a state in which skid bricks of different shapes are used, respectively.

As shown in FIGS. 9A and 9B, a first type of skid brick 32 may be disposed in the center of the rear plate P, and a second type of skid brick 33 may be disposed at an outer portion of the rear plate P. Can be placed. That is, in consideration of expansion in the longitudinal direction and expansion in the width direction of the thick plate P, it is preferable to arrange a second type of skid brick 33 on the outer portion of the thick plate P.

10A and 10B schematically show the arrangement structure of the refractory body and the skid brick in the skid row, respectively.

In one embodiment, as shown in FIG. 10A, the total length La of the refractory body 31 constituting the skid row SC is the length Lb of the entire skid brick 32 constituting the skid row SC It can be configured to be longer than that.

In addition, as shown in FIG. 10B, each of the skid bricks 32 in the skid row SC may be disposed to be spaced apart from each other at predetermined intervals so that a buffer gap G is provided between the adjacent skid bricks 32. have.

In this way, in the skid row SC, the total length Lb of the skid brick 32 is less than the length La of the refractory body 31, or the gap G for the buffer between the skid bricks 32 is By arranging it so that it is provided, when the thick plate P expands by heating, it is possible to absorb and mitigate the impact caused by the frictional resistance applied to the thick plate P.

During expansion by heating, the thick plate P is mainly stretched in the longitudinal direction. As in the present invention, the skid brick 32 supporting the thick plate P is placed on the refractory body 31 along the longitudinal direction of the thick plate P. By configuring so as to be slidable, even if the thick plate P is stretched, it slides in response to this, so that the shock applied to the thick plate P can be absorbed.

As described above, the present invention can stably support the thick plate P even with changes in the thick plate P during heating, and can prevent the occurrence of scratch defects occurring in the thick plate P.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains have realized that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. You can understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and are not limiting.

1: heat treatment device for thick plate 10: heating furnace
20: burner 30: skid
31: refractory body 31a: groove
32, 33: skid brick 32a, 33a: protrusion
40: charging stand 50: extraction stand
60: cooling facility 61: upper
61a: upper nozzle 61b: cover
62: lower 62a: lower nozzle

Claims (10)

A heating furnace having a charging door and an extraction door at the front and rear sides for charging and extracting the thick plate;
A burner for heating the inner space of the heating furnace; And
A skid disposed inside the heating furnace to support the thick plate;
Including,
The skid includes a refractory body and a skid brick placed on the refractory body and provided to contact the thick plate, a plurality of skids are arranged along the longitudinal direction of the thick plate to form a skid row, and a plurality of skid rows are the It is arranged along the width direction of the thick plate,
The refractory body has a groove formed along the transport direction of the thick plate on the upper surface,
The skid brick is formed by protruding a protrusion inserted into the groove on a lower surface thereof, and the protrusion extends in a longitudinal direction from the center of the lower surface,
In the skid row, the skid brick is provided with a buffer gap between adjacent skid bricks so as to absorb and mitigate the shock due to frictional resistance applied to the rear plate when the thick plate expands by heating. Heat treatment device for thick plate.
The method of claim 1,
The skid brick has a rectangular structure corresponding to the upper surface of the refractory body, and the upper surface has a curved surface gently protruding upward, but the center of the upper surface protrudes upward in a round shape with respect to the longitudinal direction, so that the front end and the rear end are Heat treatment apparatus for a thick plate, characterized in that configured not to contact with the thick plate.
The method of claim 2,
The skid brick heat treatment apparatus for a thick plate, characterized in that the upper surface of the skid brick is configured such that the center of the upper surface protrudes upward in a round shape based on the width direction so that both side ends do not contact the thick plate.
The method of claim 1,
Heat treatment apparatus for a thick plate, characterized in that the skid brick and the refractory material are made of different materials.
The method of claim 4,
The skid brick is a heat treatment apparatus for a thick plate, characterized in that made of a heat-resistant steel metal.
The method of claim 1,
A cooling facility capable of cooling the thick plate extracted from the heating furnace at the same time as the extraction; further includes,
A charging platform disposed in front of the heating furnace to charge the thick plate into the heating furnace through the charging door, and an extraction stand disposed at the rear of the heating furnace to extract the thick plate to the outside of the heating furnace. Heat treatment device for thick plate.
The method of claim 6,
The cooling facility includes an upper portion disposed at an upper portion of the rear plate so as to be able to move up and down with respect to the rear plate, and a lower portion disposed under the rear plate, and the upper portion and the lower portion include water as an upper surface and a lower surface of the plate. Heat treatment apparatus for a thick plate configured to spray.
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