H-shaped steel production method and H-shaped steel

Abstract

The invention discloses a production method of H-shaped steel. The production method comprises the following steps: cogging and rolling; a hole pattern of a roller of a rolling mill adopted in the cogging rolling is a special-shaped hole, and a sleeve hole exists in the special-shaped hole. According to the H-shaped steel production method, under the condition of existing rolling mill equipment, the hole pattern and the rolling process of the cogging mill are optimized, the trepanning and special-shaped hole vertical rolling process method is adopted, and production of large-specification H-shaped steel with the web height being 650 or above can be achieved. The invention provides the H-shaped steel which is manufactured by adopting the H-shaped steel production method.

Description

Technical Field

[0001] The invention belongs to the technical field of steel rolling, and in particular to an H-shaped steel production method and the H-shaped steel. Background Art

[0002] As the main product of the steel industry, H-beam has been widely used in infrastructure fields such as high-rise buildings, petrochemicals, marine engineering, bridges and dams, subway projects, and wind power generation. With the continuous expansion of the application field of hot-rolled H-beam, the demand for large-sized hot-rolled H-beam as the main load-bearing components has gradually increased due to its good mechanical properties and excellent cross-sectional parameters. For mature H-beam production lines, the production of large-sized hot-rolled H-beam is difficult due to the influence of billet size and tooling equipment conditions.

[0003] A Chinese patent with publication number CN102974609A discloses a method for hot rolling production of H-beams. The patent is mainly based on continuous casting ingots. Through reasonable heating and rolling processes and increased web compressed air blowing, H-beams above H650×300 are produced. The surface oxide scale of large-size H-beams during hot rolling can be removed well, thereby improving the surface quality of the product.

[0004] A Chinese patent with publication number CN117299784A discloses a large-height thin-web hot-rolled H-shaped steel and a production method thereof, which sequentially includes production steps of converter smelting, special-shaped billet continuous casting, billet heating, billet rolling, universal rolling and air cooling. After billet rolling, the billet includes web section I and web section II, and can produce various types of large-height + thin web + thick flange H-shaped steel.

[0005] A Chinese patent with publication number CN112872027A discloses a new process for rolling large H-beams. The rough rolling unit adopts innovative two-roller or universal combination hole type three-stand reversible continuous rolling, and the finishing rolling unit adopts universal combination hole type three-stand reversible continuous rolling plus finished product single stand headless tension-free rolling, which can improve the efficiency of the production line and reduce the rolling cost per ton of steel.

[0006] A Chinese patent with publication number CN114932144A discloses a method for producing thick hot-rolled H-shaped steel. A forming hole for forming an arc-shaped protrusion on the web of the rolled piece is formed in the hole profile of the BD rolling mill. By adopting the HH rolling method, the pass reduction rate, reduction amount, rolling speed, and rolling load are controlled. On the basis of not changing the original rolling passes, rolling temperature, and product performance, the product dimensional accuracy is improved, the problem of under-processing of the outer side of the H-shaped steel flange is effectively solved, and the dimensional accuracy and product quality are improved.

[0007] It is desirable to provide an improved method for producing H-beams, in particular with regard to achieving the production of large-size H-beams with a web height of more than 650 mm. Summary of the invention

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a method for producing H-beams, the purpose of which is to produce large-size H-beams with a web height of more than 650 mm.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is: an H-beam production method, comprising the steps of:

[0010] slab rolling;

[0011] The slab rolling adopts a rolling mill to roll the slab vertically, and the hole type of the rolling mill roll is a special-shaped hole and has a sleeve hole.

[0012] The roll surface of the rolling mill roll used in the slab rolling is composed of 3-4 special-shaped holes.

[0013] The special-shaped holes are divided into transition holes and finished holes.

[0014] The transition hole includes a web hole and a flange hole, and the flange hole includes a first flange hole and a second flange hole.

[0015] The roller is provided with a first transition hole and a second transition hole, and the sleeve hole is formed by combining the second flange hole of the first transition hole and the first flange hole of the second transition hole.

[0016] The roller is provided with a first transition hole and a second transition hole, the second flange hole of the first transition hole is located in the web hole of the second transition hole, and the first flange hole of the second transition hole is located in the web hole of the first transition hole.

[0017] The total number of passes of the slab rolling is 13 to 21.

[0018] During the slab rolling process, the shaped hole performs 1 to 3 light pressing and vertical rolling passes on the slab.

[0019] The invention provides an H-shaped steel, which is manufactured by adopting the H-shaped steel production method.

[0020] The web height of the H-shaped steel is between 650 and 1000 mm, and the flange and web thickness of the H-shaped steel are between 10 and 40 mm.

[0021] The H-beam production method of the present invention optimizes the hole type of the blanking machine and the rolling process under the existing rolling mill equipment conditions, and adopts the process method of sleeve hole and special-shaped hole vertical rolling, so as to realize the production of large-size H-beam with a web height of more than 650. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] This specification includes the following drawings, which show the following contents:

[0023] Figure 1 It is a transitional profile hole for the common groove of the blanking roll;

[0024] Figure 2 It is the hole type of the transition special-shaped sleeve hole inlaid in the blanking roll;

[0025] Marked in the figure are: 1, first transition hole; 11, first flange hole of the first transition hole; 12, second flange hole of the first transition hole; 13, web hole of the first transition hole; 2112, sleeve hole; 2, second transition hole; 21, first flange hole of the second transition hole; 22, second flange hole of the second transition hole; 23, web hole of the second transition hole. DETAILED DESCRIPTION

[0026] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0027] It should be noted that, in the following embodiments, the “first” and “second” mentioned do not represent an absolute distinction in structure and / or function, nor do they represent a sequential order of execution, but are merely for the convenience of description.

[0028] The present invention provides a method for producing H-beam, comprising the following steps:

[0029] S1, billet heating;

[0030] S2, water spraying for phosphorus removal;

[0031] S3, billet rolling;

[0032] S4, rolling by reversible universal mill;

[0033] S5, hot saw cutting;

[0034] S6, cooling on cooling bed;

[0035] S7, straightening;

[0036] S8, cold sawing to length;

[0037] S9, labeling and bundling.

[0038] Specifically, in the above step S3, the hole type of the rolling mill roll used for the blank rolling is a special-shaped hole, and there is a sleeve hole in the special-shaped hole, and the special-shaped hole is used instead of the box-shaped hole to vertically roll the blank.

[0039] In the present invention, without changing the billet size and the roll length, the billet opening hole type is optimized, and the process method of sleeve hole and special-shaped hole vertical rolling is adopted to realize the development of large-size H-shaped steel with a web height of more than 650 mm.

[0040] The rolling mill used for slab rolling is a two-roll mill, and the roll surface consists of 3-4 special-shaped holes, which are divided into transition holes and finished holes.

[0041] The transition holes include web holes and flange holes, and the flange holes include first flange holes and second flange holes.

[0042] like Figure 1 As shown, the roller is provided with a first transition hole 1 and a second transition hole 2, the flange holes of the first transition hole 1 include a first flange hole 11 and a second flange hole 12, the flange holes of the second transition hole 2 include a first flange hole 21 and a second flange hole 22, the web hole 13 of the first transition hole 1 is located between the first flange hole 11 and the second flange hole 12, and the web hole 23 of the second transition hole 2 is located between the first flange hole 21 and the second flange hole 22. The sleeve hole 2112 is composed of the second flange hole of the first transition hole 1 and the first flange hole of the second transition hole 2, and the groove bottom width of the combined hole MAX (d1, d2) < d3 < d1 + d2, d1 is the groove bottom width of the first transition hole, d2 is the groove bottom width of the second transition hole, and d3 is the groove bottom width of the combined transition hole.

[0043] As a variant implementation scheme, Figure 2 As shown, the roller is provided with a first transition hole 1 and a second transition hole 2. The flange holes of the first transition hole 1 include a first flange hole 11 and a second flange hole 12, and the flange holes of the second transition hole 2 include a first flange hole 21 and a second flange hole 22. The web hole 13 of the first transition hole 1 is located between the first flange hole 11 and the second flange hole 12, and the web hole 23 of the second transition hole 2 is located between the first flange hole 21 and the second flange hole 22. The second flange hole 12 of the first transition hole 1 is located in the web hole 23 of the second transition hole 2, and the first flange hole 21 of the second transition hole 2 is located in the web hole 13 of the first transition hole 1, and the first flange hole 21 of the second transition hole 2 is located between the first flange hole 11 and the second flange hole 12 of the first transition hole 1, and the web hole 13 of the first transition hole 1 is located between the first flange hole 21 and the second flange hole 22 of the second transition hole 2. The first transition hole 1 and the second transition hole 2 are inlaid to form a sleeve hole.

[0044] Preferably, the total number of slab rolling passes is 13 to 21, wherein during the slab rolling process, the slab is subjected to 1 to 3 light pressing and vertical rolling passes using the special-shaped holes instead of the box-shaped holes. After the slab rolling is completed, the slab is sent to the universal rolling mill by rollers for reciprocating rolling.

[0045] The present invention also provides an H-shaped steel, which is manufactured by the above H-shaped steel production method. The web height of the H-shaped steel (i.e., the distance between the two webs of the H-shaped steel) is between 650 and 1000 mm, and the thickness of the flange and web of the H-shaped steel is between 10 and 40 mm.

[0046] Example 1

[0047] The rolled specifications in this embodiment are H700x300 series specifications, and the web height of the H-shaped steel is 700mm.

[0048] This embodiment provides a production method of hot-rolled H-beam, comprising the steps of: heating the steel billet, dephosphorizing with high-pressure water, billet rolling, rolling with a reversible universal mill, hot sawing, cooling with a cooling bed, straightening, cold sawing to length, labeling and bundling. Billet rolling includes 15 passes in total, the billet mill is a two-roller mill, and the roller surface consists of three special-shaped holes, two of which are transition holes, and the other special-shaped hole is a finished product hole.

[0049] like Figure 1 As shown, in this embodiment, the two transition holes are respectively the first transition hole 1 and the second transition hole 2, the first transition hole 1 and the second transition hole 2 share a groove, the flange holes of the first transition hole 1 include the first flange hole 11 and the second flange hole 12, the flange holes of the second transition hole 2 include the first flange hole 21 and the second flange hole 22, the web hole 13 of the first transition hole 1 is located between the first flange hole 11 and the second flange hole 12, and the web hole 23 of the second transition hole 2 is located between the first flange hole 21 and the second flange hole 22. The sleeve hole 2112 is composed of the second flange hole of the first transition hole 1 and the first flange hole of the second transition hole 2.

[0050] During the billet rolling process, the billet is first rolled back and forth for 7 times in the first transition hole to widen the billet web height, and then rolled back and forth for 3 times in the second transition hole. After the billet is turned 90 degrees, the billet is then lightly pressed and rolled vertically for 2 times in the second transition hole to eliminate the ears produced on the outside of the flange of the flat-rolled billet in the special-shaped hole and avoid warping and folding defects on the outside of the flange of the H-shaped steel product. Finally, after the billet is turned 90 degrees, the billet is sent to the finished hole for 3 times of reciprocating rolling to roll out a qualified intermediate billet, which is then fed into the universal rolling mill by the roller table for rolling. The size and performance of the H-shaped steel product meet the standard requirements.

[0051] Example 2

[0052] The rolled specifications in this embodiment are H800x300 series specifications, and the web height of the H-shaped steel is 800mm.

[0053] This embodiment provides a production method of hot-rolled H-beam, comprising the steps of: heating the steel billet, dephosphorizing with high-pressure water, rolling with a billet, rolling with a reversible universal mill, sawing with a hot saw, cooling with a cooling bed, straightening, sizing with a cold saw, labeling and bundling. The billet rolling includes 17 passes in total, the billet mill is a two-roller mill, the roller surface consists of three special-shaped holes, two of which are transition holes, and the other special-shaped hole is a finished hole, the two transition holes are respectively a first transition hole and a second transition hole, and the second transition hole and the finished hole form a sleeve hole.

[0054] During the slab rolling process, the slab is first rolled back and forth 12 times in the first transition hole to widen the web height of the slab, and then the slab is rolled back and forth 2 times in the second transition hole to continue widening the web height of the slab and reduce the leg height of the slab. Finally, the slab is sent into the finished hole for 3 times of reciprocating rolling to produce a qualified intermediate slab. The intermediate slab is then input into the universal rolling mill by the roller table for rolling. The size and performance of the H-shaped steel products meet the standard requirements.

[0055] Example 3

[0056] The rolled specifications in this embodiment are H1000x300 series specifications, and the web height of the H-shaped steel is 1000mm.

[0057] This embodiment provides a production method of hot-rolled H-beam, comprising the steps of: heating the steel billet, dephosphorizing with high-pressure water, rolling with a billet, rolling with a reversible universal mill, sawing with a hot saw, cooling with a cooling bed, straightening, sizing with a cold saw, labeling and bundling. The billet rolling includes 21 passes in total, the billet mill is a two-roller mill, the roller surface consists of three special-shaped holes, two of which are transition holes, and the other special-shaped hole is a finished hole, the two transition holes are respectively a first transition hole and a second transition hole, and the second transition hole and the finished hole form a sleeve hole.

[0058] like Figure 1 As shown, in this embodiment, the two transition holes are respectively the first transition hole 1 and the second transition hole 2, the first transition hole 1 and the second transition hole 2 share a groove, the flange holes of the first transition hole 1 include the first flange hole 11 and the second flange hole 12, the flange holes of the second transition hole 2 include the first flange hole 21 and the second flange hole 22, the web hole 13 of the first transition hole 1 is located between the first flange hole 11 and the second flange hole 12, and the web hole 23 of the second transition hole 2 is located between the first flange hole 21 and the second flange hole 22. The sleeve hole 2112 is composed of the second flange hole of the first transition hole 1 and the first flange hole of the second transition hole 2.

[0059] During the billet rolling process, the billet is first rolled back and forth 11 times in the first transition hole to widen the billet web height, then rolled back and forth 3 times in the second transition hole, turned the billet 90 degrees, and then lightly pressed and rolled vertically for 2 times in the first transition hole. After turning 90 degrees, the billet is rolled back and forth 3 times in the second transition hole. Finally, the billet is sent into the finished hole and rolled back and forth 3 times to roll out a qualified intermediate billet. The intermediate billet is input into the universal rolling mill by the roller table for rolling. The size and performance of the H-shaped steel product meet the standard requirements.

[0060] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. H-beam production method, comprising the steps of: slab rolling; It is characterized in that The slab rolling adopts a rolling mill to roll the slab vertically, and the hole type of the rolling mill roll is a special-shaped hole and has a sleeve hole.

2. The H-beam production method according to claim 1, characterized in that: The roll surface of the rolling mill roll used in the slab rolling is composed of 3-4 special-shaped holes.

3. The H-beam production method according to claim 1, characterized in that: The special-shaped holes are divided into transition holes and finished holes.

4. The H-beam production method according to claim 3, characterized in that: The transition hole includes a web hole and a flange hole, and the flange hole includes a first flange hole and a second flange hole.

5. The H-beam production method according to claim 4, characterized in that: The roller is provided with a first transition hole and a second transition hole, and the sleeve hole is formed by combining the second flange hole of the first transition hole and the first flange hole of the second transition hole.

6. The H-beam production method according to claim 4, characterized in that: The roller is provided with a first transition hole and a second transition hole, the second flange hole of the first transition hole is located in the web hole of the second transition hole, and the first flange hole of the second transition hole is located in the web hole of the first transition hole.

7. The H-beam production method according to any one of claims 1 to 6, characterized in that: The total number of passes of the slab rolling is 13 to 21.

8. The H-beam production method according to any one of claims 1 to 6, characterized in that: During the slab rolling process, the shaped hole performs 1 to 3 light pressing and vertical rolling passes on the slab. 9.H-shaped steel, characterized in that: The H-shaped steel is manufactured by the H-shaped steel production method described in any one of claims 1 to 8.

10. The H-beam according to claim 9, characterized in that: The web height of the H-shaped steel is between 650 and 1000 mm, and the flange and web thickness of the H-shaped steel are between 10 and 40 mm.

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