Hot-rolled H-section steel and its production method

Abstract

The present invention discloses a hot-rolled H-shaped steel including a web, a first flange plate, and a second flange plate, in which the difference in thickness between the first flange plate and the second flange plate, |T1-T2|, is greater than 0, and the ratio of the difference in area between the first flange plate and the second flange plate, |S1-S2|, to the area S1 of the first flange plate is less than or equal to 1, or the ratio of the difference in area between the first flange plate and the second flange plate, |S1-S2|, to the area S2 of the second flange plate is less than or equal to 1. The hot-rolled H-shaped steel of the present invention can meet the production requirements of various specifications in which the thicknesses of the flanges on both sides are not equal, and can also avoid the occurrence of side bending during the rolling process. The difference in the flow rate of metal per second of the flanges on both sides during the rolling process is controlled within a certain range, thereby stably producing hot-rolled H-shaped steel with the thicknesses of the flanges on both sides being not equal. The present invention further discloses a production method of hot-rolled H-shaped steel.

Description

[Technical field]

[0001] The present invention belongs to the technical field of H-beam, specifically, the present invention relates to hot-rolled H-beam and its production method. [Background technology]

[0002] At present, all hot-rolled H-shaped steel is produced by universal rolling, and the rolled material is double-symmetrically rolled (in the height direction and width direction) into an "H" shape during the universal rolling stage. The upper and lower horizontal rolls roll and compress the web in the thickness direction, and the vertical rolls on both sides roll and compress the flanges on both sides in the thickness direction, respectively. If the thickness or width of the flanges on both sides during the rolling process is not controlled, the metal flow rate per second of the flanges on both sides will be different, causing the rolling stretch difference on both sides, and the rolled material will inevitably have side bends, which will accumulate to a certain extent and affect the bite of the subsequent passes. If the difference in the metal flow rate per second of the flanges on both sides is too large, serious side bends will cause rolling accidents. Therefore, for mass-produced hot-rolled H-shaped steel products, the outlines of both flanges are the same width and thickness. However, in different structures, there are indeed actual requirements for hot-rolled H-shaped steel with unequal thickness of the flanges on both sides.

[0003] The patent document with publication number CN103557426A discloses a hot-rolled H-shaped steel with unequal flange thickness, which adopts a blooming hole design with a thickness difference of less than 8mm between the flanges on both sides, and controls the difference in the reduction amount of the vertical rolls on both sides to the flanges to 4mm-9mm during universal rolling to produce a hot-rolled H-shaped steel with a thickness ratio of the flanges on both sides of 0.7-0.9 and a difference between the flange thickness and the web thickness of 2mm-4mm. The patent has strict limitations on the thickness ratio of the flanges on both sides and the thickness difference between the flanges and the web of the hot-rolled H-shaped steel, and if the size exceeds the range, serious side bending will occur during the rolling process, or obvious defects such as flange surface waves or web surface waves will occur, which will affect the practical use. In addition, this method can only produce the specifications of H450*150 series, and cannot be applied to larger or smaller specifications because the area ratio of the flange and the web is different from that of the specifications.

[0004] At present, the method not yet disclosed in the prior art can produce hot rolled H-section steel with unequal flange thicknesses on both sides in various specifications. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention is intended to solve at least one of the technical problems existing in the prior art, and aims to provide a hot-rolled H-section steel to meet the production requirements of various specifications in which the flanges on both sides have unequal thicknesses, and at the same time, to avoid side bending during the rolling process. [Means for solving the problem]

[0006] In order to achieve the above object, the technical solution adopted by the present invention is a hot-rolled H-shaped steel including a web, a first flange plate, and a second flange plate, in which the difference in thickness value between the first flange plate and the second flange plate, |T1-T2|, is greater than 0, and the ratio of the difference in area between the first flange plate and the second flange plate, |S1-S2|, to the area S1 of the first flange plate is 1 or less, or the ratio of the difference in area between the first flange plate and the second flange plate, |S1-S2|, to the area S2 of the second flange plate is 1 or less.

[0007] The difference in thickness between the first flange plate and the second flange plate, |T1-T2|, is in the range of 2 mm to 40 mm.

[0008] The web height H has a value ranging from 100 mm to 1250 mm.

[0009] The value of the width B1 of the first flange plate and the value of the width B2 of the second flange plate are in the range of 39 mm to 500 mm.

[0010] The value of the thickness T1 of the first flange plate and the value of the thickness T1 of the second flange plate are in the range of 7 mm to 150 mm.

[0011] The ratio of the width B1 of the first flange plate to the thickness T1 of the first flange plate is equal to or greater than 1.70.

[0012] The ratio of the width B2 of the second flange plate to the thickness T2 of the second flange plate is equal to or greater than 1.70.

[0013] The value of the web thickness Tw is equal to or less than the minimum value of the thickness T1 of the first flange plate and the thickness T2 of the second flange plate.

[0014] The present invention further provides a method for producing hot rolled H-section steel, the method including the steps of converter smelting, argon gas injection refining, special shaped billet continuous casting, billet heating, blooming, and universal rolling, wherein in the blooming step, an area of ​​a first blooming hole die is the thickness T1 of the first flange plate * the width B1 of the first flange plate * the total compression ratio, and an area of ​​a second blooming hole die is the thickness T1 of the second flange plate * the width B1 of the second flange plate * the total compression ratio.

[0015] In the universal rolling step, the two flange plates of the rolled material have a T1 / T2 value or a T2 / T1 value equal to the finished H-section steel.

[0016] The hot rolled H-section steel of the present invention can meet the production requirements of various specifications of unequal flange thicknesses, and at the same time, can avoid side bending during the rolling process, and the difference in the metal flow rate per second of the flanges on both sides during the rolling process is controlled within a certain range, so that the hot rolled H-section steel with unequal flange thicknesses on both sides can be stably produced. The hot rolled H-section steel produced has a wide product specification coverage and can meet a wide range of application requirements, and only needs to adjust the blooming hole type and edger rolling mill hole type, that is, it can be stably produced by adopting the production process of general hot rolled H-section steel and adjusting the vertical roll protocol on the existing universal rolling mill. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a structural schematic diagram of the hot-rolled H-section steel of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the drawings and the description of the examples, with the aim of helping those skilled in the art to understand the inventive concept and technical solutions of the present invention more completely, accurately and deeply, and to facilitate the implementation thereof.

[0019] It should be noted that in the following embodiments, the terms "first" and "second" described do not represent an absolute division relationship of structures and / or functions, nor do they represent an execution order of the preceding and following, but are merely for the convenience of description.

[0020] As shown in Fig. 1, the present invention provides a hot-rolled H-shaped steel including a web 3, a first flange plate 1, and a second flange plate 2. The difference in thickness between the first flange plate 1 and the second flange plate 2, |T1-T2|, is greater than 0, and the ratio of the difference in area between the first flange plate 1 and the second flange plate 2, |S1-S2|, to the area S1 of the first flange plate 1 is less than or equal to 1, or the ratio of the difference in area between the first flange plate 1 and the second flange plate 2, |S1-S2|, to the area S2 of the second flange plate 2 is less than or equal to 1. The area S1 of the first flange plate 1 is T1*B1, and the area S2 of the second flange plate 2 is T2*B2.

[0021] Specifically, as shown in Fig. 1, the web 3 is located between the first flange plate 1 and the second flange plate 2, the web 3 is fixedly connected to the first flange plate 1 and the second flange plate 2, the width direction of the first flange plate 1 is parallel to the width direction of the second flange plate 2 and parallel to the thickness direction of the web 3, the thickness direction of the first flange plate 1 is parallel to the thickness direction of the second flange plate 2 and parallel to the height direction of the web 3, the thickness direction of the first flange plate 1 is perpendicular to the width direction of the first flange plate 1, and the thickness direction of the second flange plate 2 is perpendicular to the width direction of the second flange plate 2. The distance between the outer surface of the first flange plate 1 and the outer surface of the second flange plate 2 is the height H of the web 3, the width of the first flange plate 1 is B1, the width of the second flange plate 2 is B2, the thickness of the first flange plate 1 is T1, the thickness of the second flange plate 2 is T2, the thickness of the web 3 is Tw, and the first flange plate 1, the second flange plate 2, and the web 3 are integrally structured by hot rolling.

[0022] Side bends occur in hot rolled H-section steel because the flow rates per second of metal in the flanges on both sides are different during the rolling process. Excessive side bends will affect the rolling bite of the subsequent passes, resulting in reduction and affecting normal production. However, small side bends are acceptable.

[0023] The idea of ​​the present invention is as follows: when designing the specifications of the finished hot-rolled H-section steel, the thickness and width of the flanges on both sides are changed in coordination according to the applicable requirements, and the difference in the areas of the flanges on both sides is ensured to be controlled within a certain range. The groove type and protocol are designed based on controlling the size of the flanges on both sides of the rolled material, and the difference in the metal flow rate per second of the flanges on both sides during the rolling process is controlled within a certain range, thereby stably producing hot-rolled H-section steel with unequal flange thicknesses on both sides.

[0024] In this embodiment, the difference in thickness between the first flange plate 1 and the second flange plate 2, |T1-T2|, is in the range of 2 mm to 40 mm.

[0025] In this embodiment, the value of the height H of the web 3 ranges from 100 mm to 1250 mm.

[0026] In this embodiment, the range of the value of the width B1 of the first flange plate 1 and the value of the width B2 of the second flange plate 2 is 39 mm to 500 mm.

[0027] In this embodiment, the range of the value of the thickness T1 of the first flange plate 1 and the value of the thickness T1 of the second flange plate 2 is 7 mm to 150 mm.

[0028] In this embodiment, the ratio B1 / T1 of the width B1 of the first flange plate 1 to the thickness T1 of the first flange plate 1 is 1.70 or more. The ratio B2 / T2 of the width B2 of the second flange plate 2 to the thickness T2 of the second flange plate 2 is 1.70 or more.

[0029] In this embodiment, the value of the thickness Tw of the web 3 is equal to or smaller than the minimum value of the thickness T1 of the first flange plate 1 and the thickness T2 of the second flange plate 2.

[0030] In this embodiment, the grounds for setting each size of the hot-rolled H-section steel are as follows.

[0031] If the value of the web height H is lower than 100mm, the thickness of the flange is generally small, and according to the principle of equal area, the adjustment space of the thickness of the flange on both sides is limited, so there is no obvious difference between the hot-rolled H-shaped steel with unequal thickness of the flange on both sides and the product with equal thickness on both sides in terms of cross-sectional performance, and there is no need to adjust the size of the flange by warping, so the lower limit is set to 100mm. If the value of the web height H is higher than 1250mm, a certain amount of compression in the height direction is required for universal rolling, and an ultra-high billet is required, but this cannot be realized with the current continuous casting equipment and technology level, so the upper limit is set to 1250mm.

[0032] If the flange plate width B1 or B2 is less than 39 mm, the specification has no practical value, so the lower limit is set to 39 mm. If the flange plate width B1 or B2 is more than 500 mm, an extra-wide billet must be used, but this is not feasible with the current continuous casting equipment and technology level, so the upper limit is set to 500 mm.

[0033] If the flange plate thickness T1 or T2 is less than 7mm, the web will be thinner, the ability to apply tensile resistance will decrease, and the web will be prone to wave defects after rolling, so the lower limit is set to 7mm. If the flange plate thickness T1 or T2 is higher than 150mm, it will be necessary to use an ultra-thick billet to ensure a certain compression ratio, but this cannot be achieved with the current continuous casting equipment and technology level, so the upper limit is set to 150mm.

[0034] If the thickness difference between the flange plates on both sides, |T1-T2|, is less than 2mm, the difference in cross-sectional properties between the flange plates on both sides is small, and the applicable properties are almost the same as those of hot-rolled H-shaped steel with equal thickness on both sides. From the viewpoint of economic efficiency, there is no need to adjust the size of the flange plate, so the lower limit is set to 2mm. If the thickness difference between the flange plates on both sides, |T1-T2|, is more than 40mm, the difference in the reduction amount of the vertical rolls on both sides in the universal rolling stage during the rolling process becomes large, which affects the stability of the rolling mill, and the difference in the width of the flange plates on both sides becomes large, which significantly increases the correction amount of the universal groove and the edger rolling mill groove, which affects the economy, so the upper limit is set to 40mm.

[0035] If the value of |T1*B1-T2*B2| / T1*B1 or |T1*B1-T2*B2| / T2*B2, which is the ratio of the difference in the area of ​​the flange plates on both sides to the area of ​​the flange plate on one side, is higher than 1.00%, the difference in the metal flow rate per second of the flanges on both sides will exceed a certain limit, and the rolled material will form a side bend that exceeds the allowable limit of normal rolling bite, affecting the surface quality and ultimately affecting production. Therefore, the lower limit is set to 1.00%.

[0036] If the value of B1 / T1 or the value of B2 / T2, which is the ratio of the width of the flange plate on the same side to the thickness of the flange plate, is lower than 1.70, the deformation area of ​​the flange will be concentrated on the side contacting the vertical roll during the universal rolling process, and the deformation penetration of the flange on the thicker side will be limited, resulting in a sharp decrease in the final mechanical properties of the flange plate on that side, which will affect the practical use of the product. Therefore, the lower limit is set to 1.70.

[0037] If the value of the web thickness Tw is larger than the value of T1 or T2, in the case of universal rolling, the web and flange plate may deform and become unable to be harmonized, which may cause the rolling bite to be uneven and may affect the surface quality. In addition, the specifications required for practical use are all set so that the web thickness is equal to or less than the thickness of the flange plate, and the web thickness Tw is equal to or less than the minimum value of T1 and T2.

[0038] The present invention further provides a method for producing hot rolled H-beam, the method including the steps of converter smelting, argon gas injection refining, special billet continuous casting, billet heating, blooming, universal rolling, and air cooling. In the blooming step, the area of ​​the first blooming hole of the blooming mill is the thickness T1*width B1*total compression ratio of the first flange plate 1 of the finished H-beam, and the area of ​​the second blooming hole of the blooming mill is the thickness T1*width B1*total compression ratio of the second flange plate 2 of the finished H-beam. The rolled material has an H-shaped structure, and the rolled material includes a web and two flange plates, the web is located between the two flange plates, and the web is fixedly connected to the two flange plates. During the rolling process, the billet is rolled into a special shape, and the size of the flanges on both sides of the blooming hole die is designed based on the area of ​​the flanges on both sides of the finished product size. The two flange plates of the rolled material enter the first blooming hole die and the second blooming hole die respectively.

[0039] If the size design of the flanges on both sides of the blooming die does not adopt the above method, the flanges on both sides of the die will have different areas, and side bending will occur after one pass of blooming, and the next pass will not be able to fit directly into the die, and due to the rolling action of the rolling rolls on the inner metal of the flanges, the amount of metal flowing into the metal webs of the flanges on both sides will be different, resulting in defects such as wire drawing or folding. In addition, the cross-sectional area of ​​the flanges on both sides will be increased, which will increase the difference in the metal flow rate of the flanges on both sides, and the amount of side bending will accumulate quickly to a certain extent, which will affect stable production.

[0040] The method for producing hot-rolled H-beam steel of the present invention may further include steps of hot metal pretreatment, extra-furnace refining, and vacuum refining. The hot metal pretreatment step is provided before the converter smelting step, the extra-furnace refining step is provided between the argon gas injection refining step and the vacuum refining step, and the vacuum refining step is provided between the extra-furnace refining step and the special-shaped billet continuous casting step. The steps of hot metal pretreatment, extra-furnace refining, and vacuum refining can be selected according to the requirements of different finished product mechanical properties and service performance, and the remaining steps are steps that are necessarily adopted by the method for producing hot-rolled H-beam steel.

[0041] In the universal rolling step, the edger rolling machine used should set the groove according to the height of the flanges on both sides of the finished product and participate in the whole rolling process to ensure that the height value of the flanges on both sides is stable. In addition, in the universal rolling step, the two flange plates of the rolled material are equal to the T1 / T2 value or T2 / T1 value of the H-beam finished product, and the specific values ​​are selected according to the corresponding relationship between the flanges of the rolled material and the finished product, and the remaining protocol design can be carried out according to the method already disclosed.

[0042] If the edger rolling mill in the universal rolling stage is not involved in rolling in a certain pass or the groove shape is not corrected, the height difference between the flanges on both sides of the rolled material in that pass will change, and when rolling according to the protocol for setting the flange thickness, the difference in the metal flow rate per second of the flanges on both sides will exceed the limited value, causing the side bending of the rolled material. The thicker the flange, the more serious the problem.

[0043] If the above method is not adopted to set the flange thickness on both sides of the flange of the rolled material in each pass of the universal rolling stage, then, just like the above principle, too large deviation will occur in the flow rate of metal per second on both sides of the rolled material, causing side bending of the rolled material. EXAMPLES

[0044] Example 1 As shown in Table 1, the web height H is 102 mm, the width B1 of the first flange plate 1 is 50 mm, the width B2 of the second flange plate 2 is 39 mm, the thickness T1 of the first flange plate 1 is 7 mm, the thickness T2 of the second flange plate 2 is 9 mm, the web thickness Tw is 5 mm, |T1-T2|=2 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.29.

[0045] Example 2 As shown in Table 1, the web height H is 104 mm, the width B1 of the first flange plate 1 is 50 mm, the width B2 of the second flange plate 2 is 32 mm, the thickness T1 of the first flange plate 1 is 7 mm, the thickness T2 of the second flange plate 2 is 11 mm, the web thickness Tw is 5 mm, |T1-T2|=2.91 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.57.

[0046] Example 3 As shown in Table 1, the web height H is 106 mm, the width B1 of the first flange plate 1 is 50 mm, the width B2 of the second flange plate 2 is 27 mm, the thickness T1 of the first flange plate 1 is 7 mm, the thickness T2 of the second flange plate 2 is 13 mm, the web thickness Tw is 5 mm, |T1-T2|=2.08 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.29.

[0047] Example 4 As shown in Table 1, the web height H is 605 mm, the width B1 of the first flange plate 1 is 200 mm, the width B2 of the second flange plate 2 is 155 mm, the thickness T1 of the first flange plate 1 is 17 mm, the thickness T2 of the second flange plate 2 is 22 mm, the web thickness Tw is 11 mm, |T1-T2|=7.05 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.29.

[0048] Example 5 As shown in Table 1, the web height H is 610 mm, the width B1 of the first flange plate 1 is 200 mm, the width B2 of the second flange plate 2 is 126 mm, the thickness T1 of the first flange plate 1 is 17 mm, the thickness T2 of the second flange plate 2 is 27 mm, the web thickness Tw is 11 mm, |T1-T2|=4.67 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.06.

[0049] Example 6 As shown in Table 1, the web height H is 615 mm, the width B1 of the first flange plate 1 is 200 mm, the width B2 of the second flange plate 2 is 106 mm, the thickness T1 of the first flange plate 1 is 17 mm, the thickness T2 of the second flange plate 2 is 32 mm, the web thickness Tw is 11 mm, |T1-T2|=3.31 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.24.

[0050] Example 7 As shown in Table 1, the web height H is 805 mm, the width B1 of the first flange plate 1 is 300 mm, the width B2 of the second flange plate 2 is 252 mm, the thickness T1 of the first flange plate 1 is 26 mm, the thickness T2 of the second flange plate 2 is 31 mm, the web thickness Tw is 14 mm, |T1-T2|=8.13 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.15.

[0051] Example 8 As shown in Table 1, the web height H is 810 mm, the width B1 of the first flange plate 1 is 300 mm, the width B2 of the second flange plate 2 is 217 mm, the thickness T1 of the first flange plate 1 is 26 mm, the thickness T2 of the second flange plate 2 is 36 mm, the web thickness Tw is 14 mm, |T1-T2|=6.03 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.15.

[0052] Example 9 As shown in Table 1, the web height H is 815 mm, the width B1 of the first flange plate 1 is 300 mm, the width B2 of the second flange plate 2 is 190 mm, the thickness T1 of the first flange plate 1 is 26 mm, the thickness T2 of the second flange plate 2 is 41 mm, the web thickness Tw is 14 mm, |T1-T2|=4.63 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.13.

[0053] Example 10 As shown in Table 1, the web height H is 1005 mm, the width B1 of the first flange plate 1 is 300 mm, the width B2 of the second flange plate 2 is 263 mm, the thickness T1 of the first flange plate 1 is 36 mm, the thickness T2 of the second flange plate 2 is 41 mm, the web thickness Tw is 19 mm, |T1-T2|=6.41 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.16.

[0054] Example 11 As shown in Table 1, the web height H is 1010 mm, the width B1 of the first flange plate 1 is 300 mm, the width B2 of the second flange plate 2 is 235 mm, the thickness T1 of the first flange plate 1 is 36 mm, the thickness T2 of the second flange plate 2 is 46 mm, the web thickness Tw is 19 mm, |T1-T2|=5.11 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.09.

[0055] Example 12 As shown in Table 1, the web height H is 1015 mm, the width B1 of the first flange plate 1 is 300 mm, the width B2 of the second flange plate 2 is 212 mm, the thickness T1 of the first flange plate 1 is 36 mm, the thickness T2 of the second flange plate 2 is 51 mm, the web thickness Tw is 19 mm, |T1-T2|=4.16 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.11.

[0056] Example 13 As shown in Table 1, the web height H is 1215 mm, the width B1 of the first flange plate 1 is 422 mm, the width B2 of the second flange plate 2 is 397 mm, the thickness T1 of the first flange plate 1 is 80 mm, the thickness T2 of the second flange plate 2 is 85 mm, the web thickness Tw is 40 mm, |T1-T2|=4.67 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.04.

[0057] Example 14 As shown in Table 1, the web height H is 1225 mm, the width B1 of the first flange plate 1 is 422 mm, the width B2 of the second flange plate 2 is 355 mm, the thickness T1 of the first flange plate 1 is 80 mm, the thickness T2 of the second flange plate 2 is 95 mm, the web thickness Tw is 40 mm, |T1-T2|=3.74 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.10.

[0058] Example 15 As shown in Table 1, the web height H is 1235 mm, the width B1 of the first flange plate 1 is 422 mm, the width B2 of the second flange plate 2 is 321 mm, the thickness T1 of the first flange plate 1 is 80 mm, the thickness T2 of the second flange plate 2 is 105 mm, the web thickness Tw is 40 mm, |T1-T2|=3.06 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.16.

[0059] Example 16 As shown in Table 1, the web height H is 102 mm, the width B1 of the first flange plate 1 is 100 mm, the width B2 of the second flange plate 2 is 80 mm, the thickness T1 of the first flange plate 1 is 8 mm, the thickness T2 of the second flange plate 2 is 10 mm, the web thickness Tw is 6 mm, |T1-T2|=8.00 mm, |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 are 0.

[0060] Example 17 As shown in Table 1, the web height H is 105 mm, the width B1 of the first flange plate 1 is 100 mm, the width B2 of the second flange plate 2 is 62 mm, the thickness T1 of the first flange plate 1 is 8 mm, the thickness T2 of the second flange plate 2 is 13 mm, the web thickness Tw is 6 mm, |T1-T2|=4.77 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.75.

[0061] Example 18 As shown in Table 1, the web height H is 111 mm, the width B1 of the first flange plate 1 is 100 mm, the width B2 of the second flange plate 2 is 42 mm, the thickness T1 of the first flange plate 1 is 8 mm, the thickness T2 of the second flange plate 2 is 19 mm, the web thickness Tw is 6 mm, |T1-T2|=2.21 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.25.

[0062] Example 19 As shown in Table 1, the web height H is 305 mm, the width B1 of the first flange plate 1 is 300 mm, the width B2 of the second flange plate 2 is 225 mm, the thickness T1 of the first flange plate 1 is 15 mm, the thickness T2 of the second flange plate 2 is 20 mm, the web thickness Tw is 10 mm, |T1-T2|=11.25 mm, |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 are 0.

[0063] Example 20 As shown in Table 1, the web height H is 310 mm, the width B1 of the first flange plate 1 is 300 mm, the width B2 of the second flange plate 2 is 180 mm, the thickness T1 of the first flange plate 1 is 15 mm, the thickness T2 of the second flange plate 2 is 25 mm, the web thickness Tw is 10 mm, |T1-T2|=7.20 mm, |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 are 0.

[0064] Example 21 As shown in Table 1, the web height H is 315 mm, the width B1 of the first flange plate 1 is 300 mm, the width B2 of the second flange plate 2 is 150 mm, the thickness T1 of the first flange plate 1 is 15 mm, the thickness T2 of the second flange plate 2 is 30 mm, the web thickness Tw is 30 mm, |T1-T2|=5.00 mm, |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 are 0.

[0065] Example 22 As shown in Table 1, the web height H is 521 mm, the width B1 of the first flange plate 1 is 500 mm, the width B2 of the second flange plate 2 is 432 mm, the thickness T1 of the first flange plate 1 is 32 mm, the thickness T2 of the second flange plate 2 is 37 mm, the web thickness Tw is 20 mm, |T1-T2|=11.68 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.10.

[0066] Example 23 As shown in Table 1, the web height H is 526 mm, the width B1 of the first flange plate 1 is 500 mm, the width B2 of the second flange plate 2 is 381 mm, the thickness T1 of the first flange plate 1 is 32 mm, the thickness T2 of the second flange plate 2 is 42 mm, the web thickness Tw is 20 mm, |T1-T2|=9.07 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.01.

[0067] Example 24 As shown in Table 1, the web height H is 531 mm, the width B1 of the first flange plate 1 is 500 mm, the width B2 of the second flange plate 2 is 340 mm, the thickness T1 of the first flange plate 1 is 32 mm, the thickness T2 of the second flange plate 2 is 47 mm, the web thickness Tw is 20 mm, |T1-T2|=7.23 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.03.

[0068] Example 25 As shown in Table 1, the web height H is 575 mm, the width B1 of the first flange plate 1 is 374 mm, the width B2 of the second flange plate 2 is 343 mm, the thickness T1 of the first flange plate 1 is 110 mm, the thickness T2 of the second flange plate 2 is 120 mm, the web thickness Tw is 70 mm, |T1-T2|=2.86 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.05.

[0069] Example 26 As shown in Table 1, the web height H is 585 mm, the width B1 of the first flange plate 1 is 374 mm, the width B2 of the second flange plate 2 is 316 mm, the thickness T1 of the first flange plate 1 is 110 mm, the thickness T2 of the second flange plate 2 is 130 mm, the web thickness Tw is 70 mm, |T1-T2|=2.43 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.15.

[0070] Example 27 As shown in Table 1, the web height H is 605 mm, the width B1 of the first flange plate 1 is 374 mm, the width B2 of the second flange plate 2 is 274 mm, the thickness T1 of the first flange plate 1 is 110 mm, the thickness T2 of the second flange plate 2 is 150 mm, the web thickness Tw is 70 mm, |T1-T2|=1.83 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.10.

[0071] Example 28 As shown in Table 1, the web height H is 983 mm, the width B1 of the first flange plate 1 is 470 mm, the width B2 of the second flange plate 2 is 422 mm, the thickness T1 of the first flange plate 1 is 88 mm, the thickness T2 of the second flange plate 2 is 98 mm, the web thickness Tw is 50 mm, |T1-T2|=4.31 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.01.

[0072] Example 29 As shown in Table 1, the web height H is 993 mm, the width B1 of the first flange plate 1 is 470 mm, the width B2 of the second flange plate 2 is 382 mm, the thickness T1 of the first flange plate 1 is 88 mm, the thickness T2 of the second flange plate 2 is 108 mm, the web thickness Tw is 50 mm, |T1-T2|=3.54 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.25.

[0073] Example 30 As shown in Table 1, the web height H is 1003 mm, the width B1 of the first flange plate 1 is 470 mm, the width B2 of the second flange plate 2 is 350 mm, the thickness T1 of the first flange plate 1 is 88 mm, the thickness T2 of the second flange plate 2 is 118 mm, the web thickness Tw is 50 mm, |T1-T2|=2.97 mm, and the maximum value of both |T1*B1-T2*B2| / T1*B1 and |T1*B1-T2*B2| / T2*B2 is 0.15.

[0074] [Table 1]

[0075] The present invention is described above by way of example in conjunction with the drawings. Obviously, the specific implementation of the present invention is not limited to the above manner. Any insubstantial improvements made to the method concept and technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other situations without any improvements, are all within the scope of protection of the present invention. [Explanation of symbols]

[0076] 1...First flange plate 2. Second flange plate 3. Web

Claims

1. a hot-rolled H-shaped steel including a web, a first flange plate, and a second flange plate, the difference in thickness between the first flange plate and the second flange plate being a value of |T1-T2| that is greater than 0, the ratio of the difference in area between the first flange plate and the second flange plate being a value of |S1-S2| to the area S1 of the first flange plate being equal to or less than 1, and the ratio of the difference in area between the first flange plate and the second flange plate being a value of |S1-S2| to the area S2 of the second flange plate being equal to or less than 1, the value of the difference in width between the first flange plate and the second flange plate being equal to or less than 0, and the width direction of the first flange plate being parallel to the width direction of the second flange plate; The hot-rolled H-section steel is characterized by the above.

2. The difference in thickness between the first flange plate and the second flange plate, |T1-T2|, is in the range of 2 mm to 40 mm. The hot-rolled H-section steel according to claim 1 .

3. The range of the web height H is 100 mm to 1250 mm. The hot-rolled H-section steel according to claim 1 .

4. The range of the width B1 of the first flange plate and the width B2 of the second flange plate is 39 mm to 500 mm. The hot-rolled H-section steel according to claim 1 .

5. The range of the thickness T1 of the first flange plate and the thickness T2 of the second flange plate is 7 mm to 150 mm. The hot-rolled H-section steel according to claim 1 .

6. The ratio of the width B1 of the first flange plate to the thickness T1 of the first flange plate is 1.70 or more. The hot-rolled H-section steel according to any one of claims 1 to 5.

7. The ratio of the width B2 of the second flange plate to the thickness T2 of the second flange plate is 1.70 or more. The hot-rolled H-section steel according to any one of claims 1 to 5.

8. The value of the web thickness Tw is equal to or less than the minimum value of the thickness T1 of the first flange plate and the thickness T2 of the second flange plate. The hot-rolled H-section steel according to any one of claims 1 to 5.

9. 6. A method for producing hot rolled H-section steel according to claim 1, comprising the steps of converter smelting, argon gas injection refining, special shaped billet continuous casting, billet heating, blooming, and universal rolling, wherein in the blooming step, an area of ​​a first blooming hole die is the thickness T1 of the first flange plate * the width B1 of the first flange plate * the total compression ratio, and an area of ​​a second blooming hole die is the thickness T2 of the second flange plate * the width B2 of the second flange plate * the total compression ratio. A method for producing hot rolled H-section steel.

10. In the universal rolling step, the thickness T1 / thickness T2 or thickness T2 / thickness T1 of the two flange plates of the rolled material and the finished H-shaped steel are equal; The method for producing hot rolled H-section steel according to claim 9 .

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