A billet continuous casting and rolling production line and a billet continuous casting and rolling production process

Abstract

The application provides a billet open-die continuous rolling production line and a billet open-die continuous rolling production process, and belongs to the rolling processing technical field of wire rods. The production line comprises a first type of rolling mill group and a second type of rolling mill group which are alternately arranged along the rolling direction of the billet, the pressing direction of the billet by the first type of rolling mill group intersects with the pressing direction of the billet by the second type of rolling mill group; the first type of rolling mill group comprises at least two first type of rolling mills which are connected in series, and the second type of rolling mill group comprises at least two second type of rolling mills which are connected in series. Compared with the traditional reversible open-die or semi-continuous rolling reversible open-die, the production efficiency is improved. The same rolling mill group can roll the billet at least twice in the same pressing direction, the deformation amount of the billet in the pressing direction can be increased, the deformation penetration effect of the core of the billet can be increased, the internal defects of the original as-cast structure in the core of the billet can be improved, and the product quality of the rolled billet is improved.

Description

Technical Field

[0001] This invention relates to the field of wire rod rolling technology, and in particular to a billet rolling production line and a billet rolling process. Background Technology

[0002] In the field of hot rolling of steel products, the initial rolling process for long products has shifted from focusing on the shape of billets for bars and wire rods to improving the quality of bar and wire rod products. Large-section steel billets, through an initial rolling process with increased reduction, can undergo multiple deformation and pressing of the billet core, significantly reducing internal defects in the original cast structure and noticeably improving issues such as carbon segregation. Especially for high-performance products used in the automotive and machinery industries, such as high-grade cold heading steel, high-grade gear steel, high-grade spring steel, high-standard bearing steel, high-strength cord steel, cutting wire, and piano wire, a two-heat forming process is typically used. The steps of the two-heat forming process are generally as follows: the large-section steel billet is heated, rolled into smaller-section billets by the initial rolling production line, cooled, collected, and inspected for flaws. After grinding as needed, it is sent to a bar and wire rod heating furnace for reheating and rolling to produce finished bars and wire rods.

[0003] Currently, there are three main types of long product rolling processes: the first is rolling using a single or multiple reciprocating reversible rolling mill, also known as reversible rolling; the second is rolling using a single or multiple reciprocating reversible rolling mill followed by multiple horizontal-vertical or vertical-horizontal alternating continuous rolling mills, also known as semi-continuous rolling; and the third is rolling using multiple horizontal-vertical or vertical-horizontal alternating continuous rolling mills, also known as continuous rolling. The general production method of reversible billet rolling is to roll the billet two times in the height direction and then flip it over, then roll it two times in the other direction and flip it over again, and so on, to roll the required billet. This rolling method has good deformation penetration effect, but it requires frequent forward and reverse switching of the rolls and the front and rear roller tables. In addition to moving the steel to center the slots during the interval between passes, it is also necessary to quickly adjust the rolling mill pressing mechanism to adapt to the roll gap required for the next pass. In order to avoid excessive temperature drop during the rolling process, the pure rolling time of a single pass is generally controlled within 10 seconds, and the stable rolling speed of each pass is generally controlled between 2 m / s and 5 m / s. Although the steel bite is carried out at a low speed in each pass, the frequent steel bite and throwing have a large impact on the mechanical transmission system, electrical transmission and the upper-level power grid of the rolling mill. At the same time, due to the limitation of the rolling mill pressing accuracy, the dimensional accuracy of the rolled piece is not high. Furthermore, the output of single-stand reversible billet rolling is not high. For example, for producing 150mm×150mm rolled billets, using 280mm×320mm steel billets, the annual output of single-stand reversible billet rolling is approximately 600,000 to 800,000 tons. To achieve higher output while maintaining the advantages of large deformation penetration technology in reversible billet rolling, it is necessary to use two or more reversible billet rolling mills, or the second method of semi-continuous billet rolling. However, both of these methods require setting up one or more reciprocating reversible rolling mills, resulting in a longer process line, greater temperature drop during production, and higher investment in plant, civil engineering, and equipment, making the input-output uneconomical. Moreover, it is difficult to achieve high-precision rolling of steel billets using two or more reversible billet rolling mills. The third method is full continuous billet rolling, which continuously rolls the steel billet into a finished rolled billet in one pass along the rolling direction. It has advantages such as high dimensional accuracy of finished products, high rolling efficiency, and high annual output. However, in the current continuous rolling mill process, the mill usually adopts a continuous rolling method with alternating horizontal-vertical or vertical-horizontal arrangement. During the rolling process, the height and width of the steel billet are alternately rolled one pass in turn for alternating deformation. Compared with the rolled billet obtained by the reversible rolling process, the core deformation penetration effect is poor. The internal quality of the rolled billet obtained by the current continuous rolling mill process is not as good as that of the rolled billet obtained by the reversible rolling process, which restricts the application of the continuous rolling mill process. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a billet rolling production line and a billet rolling production process to solve the problems of poor core deformation penetration effect in the prior art.

[0005] To achieve the above and other related objectives, the present invention provides a billet rolling production line, comprising a first type of rolling mill and a second type of rolling mill arranged alternately along the rolling direction of the billet, wherein the pressing direction of the first type of rolling mill on the billet intersects with the pressing direction of the second type of rolling mill on the billet.

[0006] The first type of rolling mill group includes at least two first type rolling mills connected in series, each first type rolling mill has the same pressing direction, and each first type rolling mill group performs at least two passes of continuous rolling on the billet;

[0007] The second type of rolling mill group includes at least two second type rolling mills connected in series, each second type rolling mill having the same pressing direction, and each second type rolling mill group performing at least two passes of continuous rolling on the billet.

[0008] Optionally, the first type of rolling mill is a vertical rolling mill, and the second type of rolling mill is a horizontal rolling mill.

[0009] Optionally, the angle between the pressing direction of the first type of rolling mill on the billet and the pressing direction of the second type of rolling mill on the billet is 86° to 94°.

[0010] Optionally, the billet rolling production line further includes a tail mill. In the rolling direction of the billet, when there is a second type of rolling mill group before the tail mill, the tail mill is a first type of rolling mill; when there is a first type of rolling mill group before the tail mill, the tail mill is a second type of rolling mill.

[0011] Optionally, both the first type of rolling mill and the second type of rolling mill have box-shaped passes.

[0012] Optionally, the rolling temperature of both the first type of rolling mill and the second type of rolling mill is 700℃~1250℃, the rolling speed of both the first type of rolling mill and the second type of rolling mill is 0.05m / s~10m / s, and the rolling elongation coefficient of both the first type of rolling mill and the second type of rolling mill is 1.05~1.5.

[0013] Optionally, each of the first type of rolling mill and the second type of rolling mill is driven independently.

[0014] The present invention also provides a billet continuous rolling production process, comprising the following steps:

[0015] A continuous rolling production line is used to roll the billet. The continuous rolling production line includes a first type of rolling mill and a second type of rolling mill arranged alternately along the rolling direction of the billet. The pressing direction of the first type of rolling mill on the billet intersects with the pressing direction of the second type of rolling mill on the billet.

[0016] The first type of rolling mill group includes at least two first type rolling mills connected in series, and the pressing direction of each first type rolling mill is the same; the second type of rolling mill group includes at least two second type rolling mills connected in series, and the pressing direction of each second type rolling mill is the same.

[0017] The billet is rolled by each of the first type of rolling mills and each of the second type of rolling mills. During the rolling process, each of the first type of rolling mills performs at least two consecutive rolling passes on the billet, and each of the second type of rolling mills performs at least two consecutive rolling passes on the billet.

[0018] Optionally, the billet continuous rolling production line further includes a tail mill. In the rolling direction of the billet, when there is a second type of rolling mill group preceding the tail mill, the tail mill is a first type of rolling mill; when there is a first type of rolling mill group preceding the tail mill, the tail mill is a second type of rolling mill.

[0019] After the billet passes through each of the first type of rolling mill and each of the second type of rolling mill, the tail mill rolls the billet.

[0020] Optionally, the angle between the pressing direction of the first type of rolling mill on the billet and the pressing direction of the second type of rolling mill on the billet is 86° to 94°.

[0021] Optionally, the rolling temperature of the billet is 700℃~1250℃, the rolling speed is 0.05m / s~10m / s, and the rolling elongation coefficient is 1.05~1.5.

[0022] Optionally, the billet is a round billet, a square billet, or a rectangular billet before rolling, and a square billet or a rectangular billet after rolling.

[0023] Optionally, the cross-sectional area of ​​the billet before rolling is 40000 mm². 2 ~360000mm 2 The cross-sectional area of ​​the rolled billet is 6400 mm². 2 ~90000mm 2 .

[0024] Alternatively, the billet can be rolled individually.

[0025] Optionally, the continuous rolling production line further includes a transverse moving stand, a shear, a slow cooling stand, and a cooling bed. After the billet is rolled, it is transversely moved, the head is sheared, the length is sheared, and the tail is sheared. After the tail of the billet is sheared, it is collected by the slow cooling stand or by cooling on the cooling bed to obtain the finished rolled billet.

[0026] As described above, the billet rolling production line and billet rolling process of the present invention have the following beneficial effects: By using several rolling mills to continuously roll the billet in the rolling direction, high output of rolled billets can be achieved, improving production efficiency compared to traditional reversible or semi-continuous reversible rolling. Simultaneously, since at least two rolling mills are arranged within the same rolling mill group, the same rolling mill group can roll the billet at least twice in the same pressing direction when the billet passes through it. This increases the deformation amount of the billet in that pressing direction, enhances the deformation penetration effect of the billet core, and helps to improve the internal defects of the original cast structure in the billet core, thereby improving the product quality of the rolled billet. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the layout of the billet rolling production line in an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the layout of the rolling mill unit in an embodiment of the present invention.

[0029] Figure 3 This is one of the schematic diagrams showing the deformation of each pass during the billet rolling process in an embodiment of the present invention.

[0030] Figure 4 This is the second schematic diagram of deformation during each pass of the billet rolling process in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached drawings: 1. Type I rolling mill 2. Type II rolling mill 3. Tail rolling mill 3. Continuous rolling mill 10. Transverse moving stand 20. Shear 30. Slow cooling stand 40. Cooling bed 50. Detailed Implementation

[0032] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0033] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show components relevant to the present invention and are not drawn according to the actual number, shape, and size of components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, sizes, etc., depicted in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of the present invention, should still fall within the scope of the technical content disclosed in the present invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are only for clarity of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0034] Please see Figures 1-4 This embodiment provides a billet rolling production line. Figure 1 , Figure 3 and Figure 4 The middle arrow points to the rolling direction of the billet. The continuous rolling mill production line includes a first-type mill group 1 and a second-type mill group 2 arranged alternately along the rolling direction of the billet. The pressing direction of the first-type mill group 1 on the billet intersects with the pressing direction of the second-type mill group 2. The first-type mill group 1 includes at least two first-type mills connected in series, each with the same pressing direction, and each first-type mill group 1 performs at least two passes of continuous rolling on the billet. The second-type mill group 2 includes at least two second-type mills connected in series, each with the same pressing direction, and each second-type mill group 2 performs at least two passes of continuous rolling on the billet.

[0035] The continuous rolling mill production line uses several mills to continuously roll billets in the rolling direction, achieving high output of rolled billets and improving production efficiency compared to traditional reversible or semi-continuous reversible rolling. Simultaneously, since at least two mills are installed in both the first type of mill group 1 and the second type of mill group 2, the same mill group can roll the billet at least twice in the same pressing direction when it passes through either group. This increases the deformation of the billet in that pressing direction, enhances the deformation penetration effect in the billet core, and helps improve the internal defects of the original cast structure in the billet core, thus improving the product quality of the rolled billet. The pressing direction of the first type of mill group 1 intersects with that of the second type of mill group 2. Therefore, in the rolling direction, the pressing direction of the next mill group is different from that of the previous mill group, preventing over-rolling of the billet in the same pressing direction.

[0036] like Figure 3 As shown, in some embodiments, the first type of rolling mill group 1 includes three or more first type rolling mills, and the second type of rolling mill group 2 includes three or more second type rolling mills.

[0037] like Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, the first type of rolling mill group 1 includes two first-type rolling mills, and the second type of rolling mill group 2 includes two second-type rolling mills. The number of rolling mills in the rolling mill group can be reasonably selected based on the elongation coefficient, the total number of rolling passes, and the deformation penetration effect of the billet core.

[0038] In this embodiment, the angle between the pressing direction of the first type of rolling mill group 1 and the pressing direction of the second type of rolling mill group 2 on the billet is 86° to 94°. Specifically, in this embodiment, the pressing directions of the mills in adjacent rolling mill groups can be perpendicular, that is, the angle between the pressing directions of the mills in two adjacent rolling mill groups is 90°. In reality, it is difficult for the pressing directions of the mills in adjacent rolling mill groups to be absolutely perpendicular. Therefore, in reality, the angle between the pressing directions of the mills in two adjacent rolling mill groups is 89° to 91°. The angle between the pressing direction of the first type of rolling mill group 1 and the pressing direction of the second type of rolling mill group 2 on the billet can be reasonably adjusted according to the actual production situation.

[0039] Each of the first-type rolling mill group 1, the second-type rolling mill group 2, and the tail rolling mill 3 constitutes a continuous rolling mill group 10. In some embodiments, the continuous rolling mill group 10 has one first-type rolling mill group 1 and one second-type rolling mill group 2, with either the first-type rolling mill group 1 or the second-type rolling mill group 2 positioned at the front. In this embodiment, the continuous rolling mill group 10 includes nine rolling mills arranged sequentially. Specifically, in this embodiment, the nine rolling mills of the continuous rolling mill group 10 are arranged in a vertical-vertical-horizontal-horizontal-vertical-vertical-vertical-horizontal-horizontal-vertical configuration.

[0040] In this embodiment, in two adjacent rolling mill groups, the pressing direction of the mills in one rolling mill group is arranged vertically, and the pressing direction of the mills in the other rolling mill group is arranged horizontally. Specifically, in some embodiments, the first type of rolling mill can be a horizontal rolling mill, and the second type of rolling mill can be a vertical rolling mill. In this embodiment, the first type of rolling mill is a vertical rolling mill, and the second type of rolling mill is a horizontal rolling mill.

[0041] In this embodiment, the billet continuous rolling production line also includes a tail mill 3. In the billet rolling direction, when the tail mill 3 is preceded by a second-type mill group 2, the tail mill 3 is a first-type mill; when the tail mill 3 is preceded by a first-type mill group 1, the tail mill 3 is a second-type mill. In practice, the total number of rolling passes for the billet can be determined based on parameters such as the rolling coefficient and the deformation during the billet rolling process. In the total number of mills in the continuous rolling production line, after the alternating arrangement of the first-type mill group 1 and the second-type mill group 2, the remaining mills are the tail mill 3. The average number of tail mills 3 is less than the number of first-type mills in the first-type mill group 1 and the number of second-type mills in the second-type mill group 2.

[0042] In this embodiment, both the first type of rolling mill and the second type of rolling mill have box-shaped passes. In some embodiments, the rolling mill pass can be circular, semi-circular, or rhomboid. In this embodiment, the rolling mill pass is box-shaped. The box-shaped pass can effectively prevent the billet from twisting during rolling. The box-shaped pass has a simple structure, high strength, long service life, and is suitable for billet preparation.

[0043] In this embodiment, the billet is a square or rectangular billet, meaning its cross-sectional shape is square or rectangular. The pressing directions of the mills in adjacent rolling mill groups are perpendicular, allowing them to work in conjunction with the square or rectangular billet to roll it and prevent twisting. Specifically, in this embodiment, the rolling temperature of both the first and second type of rolling mills is 700℃~1250℃, the rolling speed of both is 0.05m / s~10m / s, and the rolling elongation coefficient of both is 1.05~1.5. A too high elongation coefficient leads to over-rolling of the billet, making it prone to twisting in subsequent processes. It also increases the requirements for the rolling mills, raising production line costs. A too low elongation coefficient makes it difficult to achieve deformation and penetration into the core of the billet. In this embodiment, the elongation coefficient is 1.25.

[0044] In this embodiment, both the first type of rolling mill and the second type of rolling mill are driven independently. Specifically, in this embodiment, each rolling mill is equipped with an independent power unit, and the power units of each rolling mill operate independently, avoiding mutual interference between the power units of the rolling mills and affecting the rolling effect. In this embodiment, the power unit is an electric motor, which runs smoothly, has high torque, and is suitable for billet preparation.

[0045] This embodiment also provides a billet continuous rolling production process, including the following steps:

[0046] A continuous rolling production line is used to roll the billet. The continuous rolling production line includes a first type of rolling mill group 1 and a second type of rolling mill group 2 arranged alternately along the rolling direction of the billet. The pressing direction of the first type of rolling mill group 1 on the billet intersects with the pressing direction of the second type of rolling mill group 2 on the billet.

[0047] The first type of rolling mill group 1 includes at least two first type rolling mills connected in series, and the pressing direction of each first type rolling mill is the same. The second type of rolling mill group 2 includes at least two second type rolling mills connected in series, and the pressing direction of each second type rolling mill is the same.

[0048] The billet is rolled by each of the first type of rolling mill 1 and each of the second type of rolling mill 2. During the rolling process, each of the first type of rolling mill 1 performs at least two passes of continuous rolling on the billet, and each of the second type of rolling mill 2 performs at least two passes of continuous rolling on the billet.

[0049] In this embodiment, the billet rolling production line further includes a tail mill 3. In the rolling direction of the billet, when the tail mill 3 is preceded by a second type of rolling mill group 2, the tail mill 3 is a first type of rolling mill. When the tail mill 3 is preceded by a first type of rolling mill group 1, the tail mill 3 is a second type of rolling mill. After the billet passes through each of the first type of rolling mill group 1 and each of the second type of rolling mill group 2, the tail mill 3 rolls the billet.

[0050] In this embodiment, the angle between the pressing direction of the first type of rolling mill 1 on the billet and the pressing direction of the second type of rolling mill 2 on the billet is 86° to 94°.

[0051] In this embodiment, the rolling temperature of the billet is 700℃~1250℃, the rolling speed is 0.05m / s~10m / s, and the rolling elongation coefficient is 1.05~1.5.

[0052] In some embodiments, the billet is a round billet, a square billet, or a rectangular billet before rolling, and a square billet or a rectangular billet after rolling. In this embodiment, the cross-sectional area of ​​the billet before rolling is 40000 mm². 2 ~360000mm 2 The cross-sectional area of ​​the rolled billet is 6400 mm². 2 ~90000mm 2 .

[0053] In this embodiment, after the continuous rolling mill 10, the continuous rolling production line further includes a transverse traverse stand 20, a shear 30, a slow cooling stand 40, and a cooling bed 50. After being rolled by the continuous rolling mill 10, the billet undergoes transverse traverse, shearing of the head section, shearing to length, and shearing of the tail section. The tail section of the billet is collected by the slow cooling stand 40 or cooled by the cooling bed 50 before collection, yielding the finished rolled billet. In this embodiment, the billet is rolled single-strand. Hot steel billets are rolled single-strand in the billet rolling production line, and the shearing process after the transverse traverse is also single-strand production.

[0054] Specifically, in practical situations, for example, a rectangular hot steel billet with a cross-sectional size of 300mm × 400mm is rolled individually by various rolling mills to obtain a rolled billet with a cross-sectional size of 150mm × 150mm. The rolled billet is then transported laterally by a transverse moving stand 20 and conveyed to a shear 30 via a roller conveyor. The shear 30 shears the head, cuts to length, and cuts the tail to obtain a cut-length rolled billet. The cut-length rolled billet can be conveyed to a slow cooling stand 40 via a roller conveyor, collected at the end of the slow cooling stand 40, and then lifted by a crane to a slow cooling facility for slow cooling. Alternatively, the cut-length rolled billet can be conveyed to a cooling bed 50 via a roller conveyor, where it is cooled while moving forward step by step. After being collected at the end of the cooling bed 50, the cut-length rolled billet is lifted by a crane to a stacking area to become a finished rolled billet. In this example, there is one set of each of the transverse moving table 20, shear 30, slow cooling table 40, and cooling bed 50. Depending on the designed output of the production line, the number of sets of transverse moving table 20, shear 30, slow cooling table 40, and cooling bed 50 can be changed accordingly.

[0055] In summary, this embodiment describes a billet rolling production line and a billet rolling process. The billet rolling production line uses several rolling mills to continuously roll the billet in the rolling direction, achieving high output of rolled billets. Compared to traditional reversible or semi-continuous reversible rolling, this improves production efficiency. Furthermore, since at least two rolling mills are respectively installed in the first type of rolling mill group 1 and the second type of rolling mill group 2, the same rolling mill group can roll the billet at least twice in the same pressing direction when the billet passes through the first type of rolling mill group 1 or the second type of rolling mill group 2. This increases the deformation of the billet in that pressing direction, enhances the deformation penetration effect of the billet core, and helps to improve the internal defects of the original cast structure in the billet core, thereby improving the product quality of the rolled billet. The pressing direction of the first type of rolling mill group 1 intersects with the pressing direction of the second type of rolling mill group 2. Therefore, in the rolling direction, the pressing direction of the next rolling mill is different from that of the previous rolling mill, which can prevent over-rolling of the billet in the same pressing direction.

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A billet rolling production line, characterized in that: It includes a first type of rolling mill and a second type of rolling mill arranged alternately along the rolling direction of the billet, wherein the pressing direction of the first type of rolling mill on the billet intersects with the pressing direction of the second type of rolling mill on the billet; The first type of rolling mill group includes at least two first type rolling mills connected in series and adjacent to each other, each first type rolling mill has the same pressing direction, and each first type rolling mill group performs at least two passes of continuous rolling on the billet. The second type of rolling mill group includes at least two second type rolling mills connected in series and adjacent to each other, each second type rolling mill group has the same pressing direction, and each second type rolling mill group performs at least two passes of continuous rolling on the billet; The rolling temperature of both the first type of rolling mill and the second type of rolling mill is 700℃~1250℃, the rolling elongation coefficient of both types of rolling mill is 1.05~1.5, and the cross-sectional area of ​​the billet before rolling is 40000mm². 2 ~360000mm 2 The cross-sectional area of ​​the rolled billet is 6400 mm². 2 ~90000mm 2 .

2. The billet rolling production line according to claim 1, characterized in that: The first type of rolling mill is a vertical rolling mill, and the second type of rolling mill is a horizontal rolling mill.

3. The billet rolling production line according to claim 1, characterized in that: The angle between the pressing direction of the first type of rolling mill on the billet and the pressing direction of the second type of rolling mill on the billet is 86°~94°.

4. The billet rolling production line according to claim 1, characterized in that: The billet rolling production line also includes a tail mill. In the rolling direction of the billet, when the tail mill is preceded by a second type of rolling mill group, the tail mill is a first type of rolling mill. When the tail mill is preceded by a first type of rolling mill group, the tail mill is a second type of rolling mill.

5. The billet rolling production line according to any one of claims 1 to 4, characterized in that: Both the first type of rolling mill and the second type of rolling mill have box-shaped passes.

6. The billet rolling production line according to any one of claims 1 to 4, characterized in that: The rolling speed of both the first type of rolling mill and the second type of rolling mill is 0.05 m / s to 10 m / s.

7. The billet rolling production line according to any one of claims 1 to 4, characterized in that: Each of the first type of rolling mill and the second type of rolling mill is driven independently.

8. A billet continuous rolling production process, characterized in that, Includes the following steps: A continuous rolling production line is used to roll the billet. The continuous rolling production line includes a first type of rolling mill and a second type of rolling mill arranged alternately along the rolling direction of the billet. The pressing direction of the first type of rolling mill on the billet intersects with the pressing direction of the second type of rolling mill on the billet. The first type of rolling mill group includes at least two first type rolling mills connected in series and adjacent to each other, and the pressing direction of each first type rolling mill is the same. The second type of rolling mill group includes at least two second type rolling mills connected in series and adjacent to each other, and the pressing direction of each second type rolling mill is the same. The billet is rolled by each of the first type of rolling mill and each of the second type of rolling mill. During the rolling process, each of the first type of rolling mill performs at least two passes of continuous rolling on the billet, and each of the second type of rolling mill performs at least two passes of continuous rolling on the billet. The rolling temperature of the billet is 700℃~1250℃, the rolling elongation coefficient is 1.05~1.5, and the cross-sectional area of ​​the billet before rolling is 40000mm². 2 ~360000mm 2 The cross-sectional area of ​​the rolled billet is 6400 mm². 2 ~90000mm 2 .

9. The billet rolling process according to claim 8, characterized in that: The billet continuous rolling production line also includes a tail mill. In the billet rolling direction, when the tail mill is preceded by a second-type rolling mill group, the tail mill is a first-type rolling mill; when the tail mill is preceded by a first-type rolling mill group, the tail mill is a second-type rolling mill. After the billet passes through each of the first type of rolling mill and each of the second type of rolling mill, the tail mill rolls the billet.

10. The billet rolling process according to claim 8, characterized in that: The angle between the pressing direction of the first type of rolling mill on the billet and the pressing direction of the second type of rolling mill on the billet is 86°~94°.

11. The billet rolling process according to claim 8, characterized in that: The rolling speed is 0.05m / s to 10m / s.

12. The billet rolling process according to claim 8, characterized in that: Before rolling, the billet is a round billet, a square billet, or a rectangular billet; after rolling, the billet is a square billet or a rectangular billet.

13. The billet rolling process according to claim 8, characterized in that: Single-section rolling of billet.

14. The billet rolling process according to any one of claims 8 to 13, characterized in that: The continuous rolling production line also includes a transverse moving stand, a shear, a slow cooling stand, and a cooling bed. After the billet is rolled, it is transversely moved, the head is sheared, the length is sheared, and the tail is sheared. After the tail of the billet is sheared, it is collected by the slow cooling stand or by the cooling bed to obtain the finished rolled billet.

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