Hot-rolled H-beam 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-beams, and more particularly, the present invention relates to hot-rolled H-beams and a method for producing the same. [Background technology]

[0002] Currently, hot-rolled H-sections are produced using universal rolling, where the rolled material is double-symmetrically rolled (in both the vertical and horizontal directions) into an "H" shape during the universal rolling process. The upper and lower horizontal rolls compress the web in the thickness direction, while the two vertical rolls compress the flanges in the thickness direction. If the thickness or width of the flanges on both sides is not controlled during the rolling process, differences in the metal flow rate per second between the flanges will occur, leading to different rolling elongations on both sides. This will inevitably result in side bending of the rolled material, which, if accumulated to a certain extent, will affect the engagement of subsequent passes. If the difference in the metal flow rate per second between the flanges on both sides is too large, serious side bending will result in a rolling accident. Therefore, in mass-produced hot-rolled H-section products, both flanges have the same width and thickness. However, there are actual requirements for hot-rolled H-sections with unequal flange thicknesses in different structures.

[0003] Patent document CN103557426A discloses a hot-rolled H-section steel with unequal flange thicknesses, which employs a blooming hole design in which the difference in flange thickness between the two flanges is less than 8 mm, and in which the difference in reduction between the two vertical rolls relative to the flanges during universal rolling is controlled to 4 mm to 9 mm, thereby producing a hot-rolled H-section steel with a flange thickness ratio between the two flanges of 0.7 to 0.9 and a flange-to-web thickness difference of 2 mm to 4 mm. The patent also imposes strict limitations on the flange thickness ratio and flange-to-web thickness difference of the hot-rolled H-section steel, and if the sizes exceed the ranges, serious side bends will occur during the rolling process or obvious flange surface waviness or web surface waviness will occur, which will affect practical use. Furthermore, this method can only produce the H450*150 series specifications, and cannot be applied to larger or smaller specifications because the area ratio between the flange and the web is different from that of the specifications.

[0004] Currently, there is a method not yet disclosed in the prior art that can produce hot rolled H-section steel with unequal flange thicknesses of various specifications. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art by providing a hot-rolled H-section steel that satisfies the production requirements of various specifications in which the flange thicknesses on both sides are unequal, while simultaneously avoiding the occurrence of side bends 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-section steel comprising 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 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 ranges from 100 mm to 1250 mm.

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

[0010] The range of the thickness T1 of the first flange plate and the thickness T1 of the second flange plate is 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 1.70 or more.

[0012] 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.

[0013] The value of the thickness Tw of the web 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, comprising the steps of converter smelting, argon gas refining, deformed billet continuous casting, billet heating, blooming, and universal rolling, wherein in the blooming step, the area of ​​the 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 the area of ​​the 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 for unequal flange thicknesses of various specifications while simultaneously avoiding the occurrence of side bends during the rolling process. By controlling the difference in metal flow rate per second between the flanges during the rolling process within a certain range, hot-rolled H-section steel with unequal flange thicknesses can be stably produced. The hot-rolled H-section steel produced has a wide range of product specifications and can meet a wide range of application requirements. Moreover, it only requires adjustment of the blooming and edger mill grooves. That is, it can be stably produced using the general hot-rolled H-section steel production process and by adjusting the vertical roll protocol on an existing universal rolling mill. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a structural schematic diagram of a hot-rolled H-beam steel according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the drawings and 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 their implementation.

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

[0020] As shown in Figure 1, the present invention provides a hot-rolled H-section 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 1 or less, 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 1 or less. 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] 1 , the web 3 is located between the first flange plate 1 and the second flange plate 2, and 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, and the thickness of the web 3 is Tw. The first flange plate 1, the second flange plate 2, and the web 3 are integrally formed by hot rolling.

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

[0023] The idea behind the present invention is as follows: when designing the specifications of a hot-rolled H-section steel product, the thickness and width of the flanges on both sides are changed in coordination according to the applicable requirements, and the difference in area between the flanges on both sides is controlled within a certain range. By designing the groove shape and process based on controlling the size of the flanges on both sides of the rolled material and controlling the difference in the metal flow rate per second between the flanges on both sides during the rolling process within a certain range, hot-rolled H-section steel with unequal flange thicknesses can be produced stably.

[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 width B1 of the first flange plate 1 and 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 less 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 web height H is less than 100mm, the flange thickness is generally small and the space for adjusting the flange thickness is limited based on the principle of equal area. Therefore, there is no significant difference in cross-sectional performance between hot-rolled H-sections with unequal flange thicknesses and those with equal flange thicknesses, and there is no need to adjust the flange size due to warping. Therefore, the lower limit is set to 100mm. If the web height H is greater than 1250mm, a certain amount of vertical compression is required for universal rolling, requiring the use of extra-tall billets. However, this is not possible with current continuous casting equipment and technology, so the upper limit is set to 1250mm.

[0032] If the flange plate width B1 or B2 is less than 39 mm, the specification is of no practical value, so the lower limit is set to 39 mm. If the flange plate width B1 or B2 is greater 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, its ability to apply tensile resistance will be reduced, and the web will be more likely to develop wave defects after rolling, so the lower limit is set to 7mm.If the flange plate thickness T1 or T2 is greater than 150mm, an ultra-thick billet will be required to ensure a certain compression ratio, but this is not possible with current continuous casting equipment and technology, so the upper limit is set to 150mm.

[0034] If the difference in thickness between the flange plates (|T1-T2|) is less than 2mm, the difference in cross-sectional properties between the flange plates is small, and the applicable performance is similar to that of hot-rolled H-section steel with equal thickness on both sides. From an economic perspective, there is no need to adjust the flange plate size, so the lower limit is set to 2mm. If the difference in thickness between the flange plates (|T1-T2|) is greater than 40mm, the difference in the reduction amount between the vertical rolls on both sides during the universal rolling stage of the rolling process will be too great, affecting the stability of the rolling mill. In addition, the difference in width between the flange plates on both sides will be too great, significantly increasing the correction amount for the universal groove and edger rolling mill groove, affecting the economics, 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, causing the rolled material to form a side bend that exceeds the allowable limit for normal rolling bite, affecting surface quality and ultimately production, so the lower limit is set at 1.00%.

[0036] If the value of B1 / T1 or B2 / T2, which is the ratio of the flange plate width to the flange plate thickness on the same side, is lower than 1.70, the deformation area of ​​the flange will be concentrated on the side that contacts 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 at 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 will deform and become unable to harmonize, which will likely result in uneven rolling engagement and will further 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 value of 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 steel, including the steps of converter smelting, argon gas refining, special-shaped 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 equal to the thickness (T1) of the first flange plate 1 of the finished H-beam steel * the width (B1) of the first flange plate 1 * the total compression ratio, and the area of ​​the second blooming hole of the blooming mill is equal to the thickness (T1) of the second flange plate 2 of the finished H-beam steel * the width (B1) of the second flange plate 2 * the total compression ratio. The rolled material has an H-shaped structure and includes a web and two flange plates, the web being located between the two flange plates and fixedly connected to them. During the rolling process, the billet is rolled into a special shape, and the size of the flanges on both sides of the blooming die is designed based on the area of ​​the flanges on both sides of the finished product. The two flange plates of the rolled material enter the first blooming die and the second blooming die respectively.

[0039] If the above method is not used for the size design of the flanges on both sides of the blooming die, the flanges on both sides of the die will have different areas, resulting in side bending after one pass of blooming, and they will not be able to fit directly into the die in the next pass. 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 on both sides of the flanges will be different, resulting in defects such as wire drawing or folding. In addition, because the cross-sectional area of ​​the flanges on both sides is increased, the difference in metal flow between the flanges on both sides will be large, and if the amount of side bending accumulates quickly to a certain extent, it will affect stable production.

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

[0041] In the universal rolling step, the edger rolling mill used should be set 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. and H-beam finished products Thickness T1 / Thickness the value of T2 or Thickness T2 / Thickness T1 value teeth Similarly, the specific values ​​are selected according to the correspondence between the flanges of the rolled material and the finished product, and the remaining protocol design may be carried out according to the method already disclosed.

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

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

[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 has been 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 scheme. Various insubstantial improvements made to the method concepts and technical solutions of the present invention, or the direct application of the concepts and technical solutions 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-section steel including a web, a first flange plate, and a second flange plate, wherein a value of |T1-T2|, which is a difference in thickness between the first flange plate and the second flange plate, is greater than 0, a ratio of |S1-S2|, which is a difference in area between the first flange plate and the second flange plate, to the area S1 of the first flange plate is 1 or less, and a ratio of |S1-S2|, which is a difference in area between the first flange plate and the second flange plate, to the area S2 of the second flange plate is 1 or less, a value of |B1-B2|, which is a difference in width between the first flange plate and the second flange plate, is greater than 0, and a web-side surface of the first flange plate and a web-side surface of the second flange plate are parallel to each other; Hot-rolled H-section steel characterized by:

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 web height H ranges from 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-beam 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-beam steel according to any one of claims 1 to 5.

8. The value of the thickness Tw of the web 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-beam steel according to any one of claims 1 to 5.

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

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