Production line for super-thick h-beams and method for producing same

Abstract

The application provides a production line and a production method of super-thick H-shaped steel, and belongs to the technical field of steel rolling. In order to realize the production of super-thick H-shaped steel by using thick slabs, the production line of the super-thick H-shaped steel comprises a first BD rolling mill (1), a second BD rolling mill (2), a UR rolling mill (3), an E rolling mill (4) and a UF rolling mill (5) which are arranged in sequence along a rolling direction. The production line and the production method of the super-thick H-shaped steel can produce the super-thick H-shaped steel by using the cutting technology through the selection of thick slabs, and the deformation amount of the material in each direction is fully ensured, so that the performance requirements of the product are met.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, specifically to a production line and method for producing ultra-thick H-beams. Background Technology

[0002] H-beams are an economical section steel profile widely used in steel structures. Traditional H-beams have relatively thin webs and flanges, which fully utilizes their mechanical advantages, achieving maximum mechanical performance with a smaller cross-sectional area. Extra-thick H-beams (with flange widths reaching approximately 100mm), due to their thicker webs and flanges, offer better stability and can be used as columns in high-rise buildings. With the vigorous promotion of steel structures in the construction industry, the use of extra-thick H-beams will gradually increase.

[0003] Large and medium-sized H-beams are typically produced using continuously cast shaped billets. The advantage of continuously rolled shaped billets is fewer rolling passes on the billet mill and a faster rolling pace. However, continuously cast shaped billets are difficult to produce; the web and flange thicknesses cannot be too thick, otherwise surface cracks are easily generated. If shaped billets with thin webs and flanges are used to produce ultra-thick H-beams, the product's compression ratio is difficult to guarantee, and the core casting structure of the hot-rolled material cannot be completely eliminated, leaving potential problems for use.

[0004] Name description: Thick H-beams: The width of the flange portion is greater than 90mm. Summary of the Invention

[0005] To enable the production of ultra-thick H-beams using thick slabs, this invention provides a production line and method for ultra-thick H-beams. This production line and method can produce ultra-thick H-beams by selecting thick slabs and using cutting technology, which fully ensures the deformation of the material in all directions and meets the performance requirements of the product.

[0006] The technical solution adopted by the embodiments of the present invention to solve its technical problem is as follows: A production line for ultra-thick H-beams includes a first BD rolling mill, a second BD rolling mill, a UR rolling mill, an E rolling mill, and a UF rolling mill arranged sequentially along the rolling direction. The first BD rolling mill can cut the cross-section of the billet into a dog-bone shape. The second BD rolling mill can press down the flange portion and the web portion of the billet. The UR rolling mill can press down the flange portion and the web portion of the billet. The E rolling mill can press down the web portion of the billet. The UF rolling mill can press down the flange portion and the web portion of the billet.

[0007] A method for producing ultra-thick H-beams, wherein the method employs the aforementioned ultra-thick H-beam production line, and the method comprises the following steps in sequence: Step 1: The upright billet enters the first dog-bone rolling hole of the first BD rolling mill for rolling; Step 2: The upright billet enters the second dog-bone rolling hole of the first BD rolling mill for rolling; Step 3: The upright billet enters the third dog-bone rolling hole of the first BD rolling mill for rolling; Step 4: The upright billet enters the fourth dog-bone rolling hole of the first BD rolling mill for rolling; Step 5: The upright billet enters the first primary rolling hole of the second BD rolling mill for rolling; Step 6: Flip the upright billet 90° to form a flat billet; Step 7: The flat billet enters the second primary rolling hole of the second BD rolling mill for rolling; Step 8: The flat billet enters the third primary rolling hole of the second BD rolling mill for rolling; Step 9: The flat billet enters the third rolling hole of the UR rolling mill for rolling; Step 10: The flat billet enters the fourth rolling hole of the E rolling mill for rolling; Step 11: The flat billet enters the fifth rolling hole of the UF rolling mill for rolling.

[0008] The beneficial effect of this invention is that it can ultimately obtain ultra-thick H-beams that meet the shape and performance requirements by using thick slabs. Attached Figure Description

[0009] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0010] Figure 1 This is a schematic diagram of the production line for the ultra-thick H-beams described in this invention.

[0011] Figure 2 This is a simplified schematic diagram of the first dog-bone type rolling hole.

[0012] Figure 3 This is a simplified schematic diagram of the second dog-bone type rolling hole.

[0013] Figure 4 This is a simplified schematic diagram of the third dog-bone type rolling hole.

[0014] Figure 5 This is a simplified schematic diagram of the fourth dog-bone type rolling hole.

[0015] Figure 6 This is a simplified schematic diagram of the first primary rolling hole.

[0016] Figure 7 This is a simplified schematic diagram of the second primary rolling hole.

[0017] Figure 8 This is a simplified schematic diagram of the third primary rolling hole.

[0018] Figure 9 This is a simplified schematic diagram of the third rolling hole.

[0019] Figure 10 This is a simplified schematic diagram of the fourth rolling hole.

[0020] Figure 11 This is a simplified schematic diagram of the fifth rolling hole.

[0021] The annotations in the attached figures are explained as follows: 1. First BD rolling mill; 2. Second BD rolling mill; 3. UR rolling mill; 4. E rolling mill; 5. UF rolling mill; 6. Billet; 11. First dog-bone type rolling pass; 12. Second dog-bone type rolling pass; 13. Third dog-bone type rolling pass; 14. Fourth dog-bone type rolling pass; 15. First BD horizontal roll; 21. First primary rolling pass; 22. Second primary rolling pass; 23. Third primary rolling pass; 24. Second BD horizontal roll; 31. Third rolling hole; 32. Third horizontal roll; 33. Third vertical roll; 41. Fourth rolling hole; 42. Fourth horizontal roll; 51. Fifth rolling hole; 52. Fifth horizontal roll; 53. Fifth vertical roll; 61. Wing flange portion; 62. Web portion; 111. First lower protruding wedge; 121. Second lower protruding wedge; 131. Third lower protruding wedge; 141. Fourth lower protruding wedge; 211. First left diagonal line segment; 212. First horizontal line segment; 213. First right diagonal line segment; 221. Second left-end diagonal line segment; 222. Second upper left horizontal line segment; 223. Second middle left diagonal line segment; 224. Second middle horizontal line segment; 225. Second middle right diagonal line segment; 226. Second upper right horizontal line segment; 227. Second right-end diagonal line segment; 231. Third left-end diagonal line segment; 232. Third upper left horizontal line segment; 233. Third middle left diagonal line segment; 234. Third middle horizontal line segment; 235. Third middle right diagonal line segment; 236. Third upper right horizontal line segment; 237. Third right-end diagonal line segment; 311. Third left diagonal line segment; 312. Third horizontal line segment; 313. Third right diagonal line segment; 314. Third left-end upward diagonal line segment; 315. Third left-end downward diagonal line segment; 411. Fourth left-end diagonal segment; 412. Fourth left-middle diagonal segment; 413. Fourth horizontal segment; 414. Fourth right-middle diagonal segment; 415. Fourth right-end diagonal segment; 511. Fifth left vertical line segment; 512. Fifth horizontal line segment; 513. Fifth right vertical line segment; 514. Fifth left vertical line segment. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] For ease of understanding and description, the following description of the present invention uses absolute positional relationships. Unless otherwise specified, the directional term "above" indicates... Figure 2 The direction above, the directional word "down" indicates Figure 2 The lower side of the middle, the directional word "left" indicates Figure 2 The left-hand direction in the text, the directional word "right" indicates Figure 2 The right-hand direction in the text, the directional word "front" indicates perpendicular to. Figure 2 The direction of the paper and the direction pointing inwards; the directional word "back" indicates perpendicular to. Figure 2 The orientation of the paper is pointed outwards from the viewpoint of the reader or user. This invention is described from the perspective of the reader or user, but the aforementioned directional terms should not be construed as limiting the scope of protection of this invention. Regarding the material, weight, size, angle, and parameters of the components, those skilled in the art can determine or replace them according to actual needs or a limited number of experiments.

[0024] In this embodiment, as Figure 1 As shown, the production line for the ultra-thick H-beam includes a first BD rolling mill 1, a second BD rolling mill 2, a UR rolling mill 3, an E rolling mill 4, and a UF rolling mill 5 arranged sequentially along the rolling direction A. The first BD rolling mill 1 can cut the cross-section of the billet 6 into a dog-bone shape. The second BD rolling mill 2 can press down the flange portion 61 and the web portion 62 of the billet 6. The UR rolling mill 3 can press down the flange portion 61 and the web portion 62 of the billet 6. The E rolling mill 4 can press down the web portion 62 of the billet 6. The UF rolling mill 5 can press down the flange portion 61 and the web portion 62 of the billet 6.

[0025] like Figure 2 , Figure 3 , Figure 4 , Figure 5As shown, the first BD rolling mill 1 (first billet rolling mill) includes a first dogbone rolling hole 11, a second dogbone rolling hole 12, a third dogbone rolling hole 13 and a fourth dogbone rolling hole 14 arranged sequentially along the rolling direction A. The first dogbone rolling hole 11, the second dogbone rolling hole 12, the third dogbone rolling hole 13 and the fourth dogbone rolling hole 14 are all composed of two first BD horizontal rolls 15 arranged vertically and vertically.

[0026] The upper contour of the first dogbone-shaped rolling hole 11 contains a first lower protruding wedge 111, the upper contour of the second dogbone-shaped rolling hole 12 contains a second lower protruding wedge 121, the upper contour of the third dogbone-shaped rolling hole 13 contains a third lower protruding wedge 131, and the upper contour of the fourth dogbone-shaped rolling hole 14 contains a fourth lower protruding wedge 141.

[0027] The lower profile of the first dog-bone type rolling hole 11 contains a first upper protruding wedge, the lower profile of the second dog-bone type rolling hole 12 contains a second upper protruding wedge, the lower profile of the third dog-bone type rolling hole 13 contains a third upper protruding wedge, and the lower profile of the fourth dog-bone type rolling hole 14 contains a fourth upper protruding wedge.

[0028] The upper contour lines of the first dog-bone type rolling hole 11 and the lower contour lines of the first dog-bone type rolling hole 11 are symmetrical and mirror images of each other. The upper contour lines of the second dog-bone type rolling hole 12 and the lower contour lines of the second dog-bone type rolling hole 12 are symmetrical and mirror images of each other. The upper contour lines of the third dog-bone type rolling hole 13 and the lower contour lines of the third dog-bone type rolling hole 13 are symmetrical and mirror images of each other. The upper contour lines of the fourth dog-bone type rolling hole 14 and the lower contour lines of the fourth dog-bone type rolling hole 14 are symmetrical and mirror images of each other.

[0029] like Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, the width of the first protruding wedge 111 ( Figure 2 The dimension in the left-right direction is smaller than the width of the second lower protruding wedge 121. Figure 3 (Dimensions in the left-right direction), the width of the second lower protruding wedge 121 is smaller than that of the third lower protruding wedge 131, and the width of the third lower protruding wedge 131 is smaller than that of the fourth lower protruding wedge 141.

[0030] The heights of the first lower protruding wedge 111, the second lower protruding wedge 121, the third lower protruding wedge 131, and the fourth lower protruding wedge 141 must all be sufficiently high to ensure that the slit billet 6 forms a dog-bone shape, and the width must meet the requirements for subsequent flange forming. The main function of the first slitting wedge (i.e., the first lower protruding wedge 111 and the first upper protruding wedge) is positioning, forming a positioning groove in the middle of the billet. The main function of the second slitting wedge (i.e., the second lower protruding wedge 121 and the second upper protruding wedge) is to increase the groove depth based on the first wedge, while widening the groove of the first wedge. This wedge can connect the first and third wedges, increasing the stability of the cutting depth process. The main function of the third slitting wedge (i.e., the third lower protruding wedge 131 and the third upper protruding wedge) is to widen the groove formed by the first two wedges. The fourth slitting wedge (i.e., the fourth lower protruding wedge 141 and the fourth upper protruding wedge) further widens the rolled piece. The four wedges transition gradually, ensuring stability during the cutting process. The stable transition of each cutting wedge is crucial for guaranteeing the dimensional accuracy of the final product.

[0031] The second BD mill 2 (second billet mill) contains a first primary rolling hole 21, a second primary rolling hole 22 and a third primary rolling hole 23 arranged sequentially along the rolling direction. The first primary rolling hole 21, the second primary rolling hole 22 and the third primary rolling hole 23 are all composed of two second BD horizontal rolls 24 arranged vertically and horizontally.

[0032] like Figure 6 As shown, the first primary rolling hole 21 is a flat-pressing hole. The cross-sectional shape of the first primary rolling hole 21 is roughly drum-shaped. The upper contour line of the first primary rolling hole 21 contains a first left oblique line segment 211, a first horizontal line segment 212, and a first right oblique line segment 213 connected sequentially from left to right. The first horizontal line segment 212 is located above the first left oblique line segment 211 and the first right oblique line segment 213, and the first horizontal line segment 212 can press down the flange portion 61 of the billet 6. The upper contour line and the lower contour line of the first primary rolling hole 21 are symmetrical and mirror images of each other.

[0033] like Figure 7As shown, the second primary rolling hole 22 is a special-shaped hole. The cross-sectional shape of the second primary rolling hole 22 is roughly dumbbell-shaped. The upper contour line of the second primary rolling hole 22 contains the second left-end oblique line segment 221, the second upper left horizontal line segment 222, the second left middle oblique line segment 223, the second middle horizontal line segment 224, the second right middle oblique line segment 225, the second upper right horizontal line segment 226, and the second right end oblique line segment 227 connected sequentially from left to right. The second upper left horizontal line segment 222 is located above the second left end oblique line segment 221 and the second left middle oblique line segment 223. The second upper right horizontal line segment 226 is located above the second right middle oblique line segment 225 and the second right end oblique line segment 227. The second middle horizontal line segment 224 is located below the second left middle oblique line segment 223 and the second right middle oblique line segment 225. The second middle horizontal line segment 224 can press down the web portion 62 of the billet 6. The upper contour line of the second primary rolling hole 22 and the lower contour line of the second primary rolling hole 22 are symmetrical and mirror images of each other.

[0034] like Figure 8 As shown, the third primary rolling hole 23 is a special-shaped hole. The cross-sectional shape of the third primary rolling hole 23 is roughly dumbbell-shaped. The upper contour line of the third primary rolling hole 23 contains the third left-end oblique line segment 231, the third upper left horizontal line segment 232, the third middle left oblique line segment 233, the third middle horizontal line segment 234, the third middle right oblique line segment 235, the third upper right horizontal line segment 236, and the third right-end oblique line segment 237 connected sequentially from left to right. The third upper left horizontal line segment 232 is located above the third left-end oblique line segment 231 and the third middle left oblique line segment 233. The third upper right horizontal line segment 236 is located above the third middle right oblique line segment 235 and the third right-end oblique line segment 237. The third middle horizontal line segment 234 is located below the third middle left oblique line segment 233 and the third middle right oblique line segment 235. The third middle horizontal line segment 234 can press down the web portion 62 of the billet 6. The upper contour line and the lower contour line of the third primary rolling hole 23 are symmetrical and mirror images of each other.

[0035] The primary function of the first primary rolling pass 21 is to fully flatten the end of the dog-bone billet sent from the first BD rolling mill 1, forming the initial flange thickness. The billet then enters the second primary rolling pass 22, which presses down the web portion 62 of the billet 6, while the flange portion 61 is barely pressed down. The metal in the flange portion 61 is pulled away by the web metal, leaving the flange metal. The third primary rolling pass 23 shapes the material exiting the second primary rolling pass 22, forming a shaped billet that meets the requirements for entering the universal rolling mill.

[0036] like Figure 9As shown, the UR mill 3 (i.e., the universal roughing mill) contains a third rolling pass 31. The cross-sectional shape of the third rolling pass 31 is approximately dumbbell-shaped or H-shaped. The third rolling pass 31 consists of two third horizontal rolls 32 spaced vertically and two third vertical rolls 33 spaced horizontally (a total of four rolls). The upper contour of the third rolling pass 31 contains a third left oblique line segment 311, a third horizontal line segment 312, and a third right oblique line segment 313 connected sequentially from left to right. The third horizontal line segment 312 can press down the web portion 62 of the billet 6. The middle of the left end contour of the third rolling pass 31 protrudes to the right. The left end contour of the third rolling pass 31 contains a third left end upper oblique line segment 314 and a third left end lower oblique line segment 315 connected vertically. The third left end upper oblique line segment 314 and the third left end lower oblique line segment 315 can press down the flange portion 61 of the billet 6. The upper and lower contour lines of the third rolling hole 31 are symmetrical and mirror images of each other. The left and right contour lines of the third rolling hole 31 are symmetrical and mirror images of each other.

[0037] like Figure 10 As shown, the E mill 4 (vertical roll edge mill) contains a fourth rolling pass 41. The cross-sectional shape of the fourth rolling pass 41 is approximately dumbbell-shaped. The fourth rolling pass 41 consists of two fourth horizontal rolls 42 (two rolls in total) spaced vertically. The upper contour line of the fourth rolling pass 41 contains a fourth left-end oblique line segment 411, a fourth left-middle oblique line segment 412, a fourth horizontal line segment 413, a fourth right-middle oblique line segment 414, and a fourth right-end oblique line segment 415 connected sequentially from left to right. The fourth horizontal line segment 413 can press down the web portion 62 of the billet 6. The upper and lower contour lines of the fourth rolling pass 41 are symmetrical and mirror images of each other.

[0038] like Figure 11As shown, the UF mill 5 (universal finished product mill) contains a fifth rolling pass 51. The cross-sectional shape of the fifth rolling pass 51 is approximately H-shaped. The fifth rolling pass 51 consists of two fifth horizontal rolls 52 spaced vertically and two fifth vertical rolls 53 spaced horizontally (a total of four rolls). The upper contour of the fifth rolling pass 51 contains a fifth left vertical line segment 511, a fifth horizontal line segment 512, and a fifth right vertical line segment 513 connected sequentially from left to right. The fifth horizontal line segment 512 can press down the web portion 62 of the billet 6. The left end contour of the fifth rolling pass 51 contains a fifth left vertical line segment 514, which can press down the flange portion 61 of the billet 6. The upper and lower contour lines of the fifth rolling hole 51 are symmetrical and mirror images of each other. The left and right contour lines of the fifth rolling hole 51 are symmetrical and mirror images of each other.

[0039] The following describes a method for producing ultra-thick H-beams. This method utilizes the aforementioned ultra-thick H-beam production line and includes the following steps: Step 1: The upright billet 6 enters the first dog-bone type rolling hole 11 of the first BD rolling mill 1 for rolling; Step 2: The upright billet 6 enters the second dog-bone rolling hole 12 of the first BD rolling mill 1 for rolling; Step 3: The upright billet 6 enters the third dog-bone rolling hole 13 of the first BD rolling mill 1 for rolling; Step 4: The upright billet 6 enters the fourth dog-bone rolling hole 14 of the first BD rolling mill 1 for rolling; Step 5: The upright billet 6 enters the first primary rolling hole 21 of the second BD rolling mill 2 for rolling; Step 6: Flip the upright billet 6 90° to form a flat billet 6; Step 7: The flat billet 6 enters the second primary rolling hole 22 of the second BD rolling mill 2 for rolling; Step 8: The flat billet 6 enters the third primary rolling hole 23 of the second BD rolling mill 2 for rolling; Step 9: The flat billet 6 enters the third rolling hole 31 of the UR rolling mill 3 for rolling; Step 10: The flat billet 6 enters the fourth rolling hole 41 of the E rolling mill 4 for rolling; Step 11: The flat billet 6 enters the fifth rolling hole 51 of the UF rolling mill 5 for rolling.

[0040] The production method of the ultra-thick H-beams utilizes a slitting method to cut the material into a dog-bone cross-section. Then, it is pressed down in the height direction within a flat-bottomed box-shaped bore to further widen the dog-bone cross-section. The dog-bone cross-section is then rolled using a special-shaped bore to obtain a special-shaped billet that meets dimensional requirements. Reciprocating rolling is then performed on a reversible universal continuous rolling mill, with vertical rolls used to correct the leg dimensions, ultimately obtaining ultra-thick H-beams that meet both shape and performance requirements.

[0041] The following describes the production method of ultra-thick H-beams, taking H558mm×452mm×65mm×100mm as an example. The production method of ultra-thick H-beams includes the following steps: The billet selected is a 1400×400 slab.

[0042] Step 1: The upright billet 6 enters the first dog-bone type rolling hole 11 of the first BD rolling mill 1 for rolling; Step 2: The upright billet 6 enters the second dog-bone rolling hole 12 of the first BD rolling mill 1 for rolling; Step 3: The upright billet 6 enters the third dog-bone rolling hole 13 of the first BD rolling mill 1 for rolling; Step 4: The upright billet 6 enters the fourth dog-bone rolling hole 14 of the first BD rolling mill 1 for rolling; Step 5: The upright billet 6 enters the first primary rolling hole 21 of the second BD rolling mill 2 for rolling; Step 6: The turning machine flips the upright billet 6 by 90° to form a flat billet 6. The turning machine is set between the first primary rolling hole 21 and the second primary rolling hole 22. Step 7: The flat billet 6 enters the second primary rolling hole 22 of the second BD rolling mill 2 for rolling; Step 8: The flat billet 6 enters the third primary rolling hole 23 of the second BD rolling mill 2 for rolling; Step 9: The flat billet 6 enters the third rolling hole 31 of the UR rolling mill 3 for 3-5 reversible passes; Step 10: The flat billet 6 enters the fourth rolling hole 41 of the E rolling mill 4 for 3 to 5 reversible passes. Step 11: The flat billet 6 enters the fifth rolling hole 51 of the UF rolling mill 5 for 3 to 5 reversible passes of rolling, and finally rolls into the finished product.

[0043] Steps 9 to 11 use the XH rolling method. The product produced is rolled from a 400mm thick slab to a 65mm thick finished product in the web direction, which is 400 / 65=6.15 times thicker. In the H direction, it is rolled from 1400mm to 558mm, which is 1400 / 558=2.5 times thicker. Moreover, the flange metal is mainly formed by the widening of the slab, so the material properties can fully meet the requirements.

[0044] The above description is merely a specific embodiment of the present invention and should not be construed as limiting the scope of the invention. Therefore, substitutions of equivalent components, or equivalent changes and modifications made within the scope of protection of the present invention, should still fall within the scope of the present invention. Furthermore, the technical features, technical solutions, and embodiments of the present invention can be freely combined and used.

Claims

1. A production line for ultra-thick H-beams, characterized in that, The production line for the ultra-thick H-beam includes a first BD rolling mill (1), a second BD rolling mill (2), a UR rolling mill (3), an E rolling mill (4), and a UF rolling mill (5) arranged sequentially along the rolling direction. The first BD rolling mill (1) can cut the cross section of the billet (6) into a dog-bone shape. The second BD rolling mill (2) can press down the flange portion (61) and the web portion (62) of the billet (6). The UR rolling mill (3) can press down the flange portion (61) and the web portion (62) of the billet (6). The E rolling mill (4) can press down the web portion (62) of the billet (6). The UF rolling mill (5) can press down the flange portion (61) and the web portion (62) of the billet (6).

2. The production line for ultra-thick H-beams according to claim 1, characterized in that, The first BD mill (1) includes a first dogbone rolling hole (11), a second dogbone rolling hole (12), a third dogbone rolling hole (13) and a fourth dogbone rolling hole (14) arranged sequentially along the rolling direction. The first dogbone rolling hole (11), the second dogbone rolling hole (12), the third dogbone rolling hole (13) and the fourth dogbone rolling hole (14) are all composed of two first BD horizontal rolls (15) arranged vertically and vertically.

3. The production line for ultra-thick H-beams according to claim 2, characterized in that, The upper profile of the first dogbone-shaped rolling hole (11) contains a first lower protruding wedge (111), the upper profile of the second dogbone-shaped rolling hole (12) contains a second lower protruding wedge (121), the upper profile of the third dogbone-shaped rolling hole (13) contains a third lower protruding wedge (131), and the upper profile of the fourth dogbone-shaped rolling hole (14) contains a fourth lower protruding wedge (141).

4. The production line for ultra-thick H-beams according to claim 3, characterized in that, The width of the first lower protruding wedge (111) is less than the width of the second lower protruding wedge (121), the width of the second lower protruding wedge (121) is less than the width of the third lower protruding wedge (131), and the width of the third lower protruding wedge (131) is less than the width of the fourth lower protruding wedge (141).

5. The production line for ultra-thick H-beams according to claim 2, characterized in that, The second BD mill (2) contains a first primary rolling hole (21), a second primary rolling hole (22) and a third primary rolling hole (23) arranged sequentially along the rolling direction. The first primary rolling hole (21), the second primary rolling hole (22) and the third primary rolling hole (23) are all composed of two second BD horizontal rolls (24) arranged vertically and vertically.

6. The production line for ultra-thick H-beams according to claim 5, characterized in that, The upper contour of the first primary rolling hole (21) contains a first left oblique line segment (211), a first horizontal line segment (212) and a first right oblique line segment (213) connected from left to right. The first horizontal line segment (212) is located above the first left oblique line segment (211) and the first right oblique line segment (213). The first horizontal line segment (212) can press down the flange portion (61) of the billet (6). The upper contour of the second primary rolling hole (22) contains a second left-end oblique line segment (221), a second upper left horizontal line segment (222), a second left middle oblique line segment (223), a second middle horizontal line segment (224), a second right middle oblique line segment (225), a second upper right horizontal line segment (226), and a second right end oblique line segment (227) connected from left to right. The second upper left horizontal line segment (222) is located above the second left end oblique line segment (221) and the second left middle oblique line segment (223). The second upper right horizontal line segment (226) is located above the second right middle oblique line segment (225) and the second right end oblique line segment (227). The second middle horizontal line segment (224) is located below the second left middle oblique line segment (223) and the second right middle oblique line segment (225). The second middle horizontal line segment (224) can press down the web portion (62) of the billet (6). The upper contour of the third primary rolling hole (23) contains the third left-end oblique line segment (231), the third upper left horizontal line segment (232), the third middle left oblique line segment (233), the third middle horizontal line segment (234), the third middle right oblique line segment (235), the third upper right horizontal line segment (236), and the third right-end oblique line segment (237) connected from left to right. The third upper left horizontal line segment (232) is located above the third left-end oblique line segment (231) and the third middle left oblique line segment (233). The third upper right horizontal line segment (236) is located above the third middle right oblique line segment (235) and the third right-end oblique line segment (237). The third middle horizontal line segment (234) is located below the third middle left oblique line segment (233) and the third middle right oblique line segment (235). The third middle horizontal line segment (234) can press down the web portion (62) of the billet (6).

7. The production line for ultra-thick H-beams according to claim 6, characterized in that, The UR rolling mill (3) contains a third rolling hole (31), which is composed of two third horizontal rolls (32) spaced apart vertically and two third vertical rolls (33) spaced apart horizontally. The upper contour of the third rolling hole (31) contains a third left oblique line segment (311), a third horizontal line segment (312), and a third right oblique line segment (313) connected from left to right. The third horizontal line segment (312) can press down the web portion (62) of the billet (6). The left end contour of the third rolling hole (31) contains a third left end upper oblique line segment (314) and a third left end lower oblique line segment (315) connected vertically. The third left end upper oblique line segment (314) and the third left end lower oblique line segment (315) can press down the flange portion (61) of the billet (6).

8. The production line for ultra-thick H-beams according to claim 7, characterized in that, The E mill (4) contains a fourth rolling hole (41), which is composed of two fourth horizontal rolls (42) spaced apart vertically. The upper contour of the fourth rolling hole (41) contains a fourth left-end oblique line segment (411), a fourth left-middle oblique line segment (412), a fourth horizontal line segment (413), a fourth right-middle oblique line segment (414), and a fourth right-end oblique line segment (415) connected sequentially from left to right. The fourth horizontal line segment (413) can press down the web portion (62) of the billet (6).

9. The production line for ultra-thick H-beams according to claim 8, characterized in that, The UF mill (5) contains a fifth rolling hole (51), which is composed of two fifth horizontal rolls (52) spaced apart vertically and two fifth vertical rolls (53) spaced apart horizontally. The upper contour of the fifth rolling hole (51) contains a fifth left vertical line segment (511), a fifth horizontal line segment (512), and a fifth right vertical line segment (513) connected sequentially from left to right. The fifth horizontal line segment (512) can press down the web portion (62) of the billet (6). The left end contour of the fifth rolling hole (51) contains a fifth left vertical line segment (514), which can press down the flange portion (61) of the billet (6).

10. A method for producing ultra-thick H-beams, characterized in that, The method for producing ultra-thick H-beams uses the production line for ultra-thick H-beams as described in claim 1, and the method for producing ultra-thick H-beams includes the following steps in sequence: Step 1: The upright billet (6) enters the first dog-bone rolling hole (11) of the first BD rolling mill (1) for rolling; Step 2: The upright billet (6) enters the second dog-bone rolling hole (12) of the first BD rolling mill (1) for rolling; Step 3: The upright billet (6) enters the third dog-bone rolling hole (13) of the first BD rolling mill (1) for rolling; Step 4: The upright billet (6) enters the fourth dog-bone rolling hole (14) of the first BD rolling mill (1) for rolling; Step 5: The upright billet (6) enters the first primary rolling hole (21) of the second BD rolling mill (2) for rolling; Step 6: Flip the upright billet (6) 90° to form a flat billet (6); Step 7: The flat billet (6) enters the second primary rolling hole (22) of the second BD rolling mill (2) for rolling; Step 8: The flat billet (6) enters the third primary rolling hole (23) of the second BD rolling mill (2) for rolling; Step 9: The flat billet (6) enters the third rolling hole (31) of the UR rolling mill (3) for rolling; Step 10: The flat billet (6) enters the fourth rolling hole (41) of the E rolling mill (4) for rolling; Step 11: The flat billet (6) enters the fifth rolling hole (51) of the UF rolling mill (5) for rolling.

Images