An asymmetric flange hot-rolled H-beam and its production method

Abstract

An asymmetric flange hot-rolled H-beam and its production method belong to the technical field of H-beam preparation. For this asymmetric flange hot-rolled H-beam, the difference in thickness between flange plate Ⅰ and flange plate Ⅱ, |tf1 - tf2| > 0, and / or the difference in width between flange plate Ⅰ and flange plate Ⅱ, |B1 - B2| > 0. In the blooming rolling process for preparing the above H-beam, a blooming pass with blooming pass Ⅰ and blooming pass Ⅱ is adopted. The width of flange deformation zone Ⅰ is greater than that of flange deformation zone Ⅱ, and the thickness of web deformation zone Ⅰ is less than that of web deformation zone Ⅱ. The beneficial effect of the present invention is that based on the existing symmetric cross-section shaped blank, a blooming pass with non-axisymmetric flanges on both sides is adopted to form an intermediate blank combined with "wide flange + thin web" and "narrow flange + thick web", and then it is formed by universal rolling. This not only controls the side bending during the rolling process, but also can produce hot-rolled H-beams with non-symmetric flanges on both sides in various specifications.

Description

Technical Field

[0001] The present invention relates to the technical field of H-beam preparation, and particularly relates to an asymmetric flange hot-rolled H-beam and a production method thereof. Background Art

[0002] Domestic hot-rolled H-beams all adopt the "blooming + universal" rolling method. The use of profiled billets can reduce the number of rolling passes and energy consumption, and is the preferred billet type for conventional hot-rolled H-beams. Since conventional hot-rolled H-beams have a double-axisymmetric cross-section, the profiled billets used also have a double-axisymmetric cross-section. The billet is reciprocally rolled by a two-high blooming mill to form an intermediate billet, and then reciprocally rolled by a universal mill to form a conventional hot-rolled H-beam with symmetric cross-sections on both sides of the flange. The schematic diagram of the profiled billet cross-section is as Figure 1 shown; the schematic diagram of the blooming rolling cross-section of the conventional hot-rolled H-beam is as Figure 2 shown, where BDH1 and BDH2 are the upper roll and the lower roll of the blooming mill respectively, and the formed pass is symmetric up and down and left and right. The shaded area represents the cross-section of the rolled piece; the schematic diagram of the universal rolling cross-section of the conventional hot-rolled H-beam is as Figure 3 shown, where UH1 and UH2 respectively represent the upper horizontal roll and the lower horizontal roll of the universal mill, and UV1 and UV2 respectively represent the left vertical roll and the right vertical roll of the universal mill. The shaded area represents the cross-section of the rolled piece.

[0003] Since hot-rolled H-beams are mostly used in beam structures, when arranged in an "I" shape to bear bending moments, the cross-section of the lower flange is mainly subjected to tensile stress, while the cross-section of the upper flange is mainly subjected to compressive stress. Considering from the aspects of structural safety and economy, the cross-section size requirements of the lower flange are relatively wide and thick, while the upper flange is relatively narrow and thin. If conventional hot-rolled H-beams are used, due to their axisymmetric cross-section, in order to ensure bearing safety, taking the cross-section size of the lower flange as the standard, the metal amount of the upper flange is excessive, and the economy is poor. Sometimes it also affects the connection space between the upper flange and the bearing surface, while the hot-rolled H-beam with asymmetric flanges on both sides is an ideal choice.

[0004] According to the existing method, when using profiled billets and symmetric passes on both sides for rolling, producing hot-rolled H-beams with asymmetric flanges on both sides is bound to cause different elongations of the flanges on both sides of the rolled piece, which will further lead to the bending of the rolled piece, making it impossible to bite into the next pass, and even causing accidents such as the rolled piece running out. Although it is conceivable to use asymmetric cross-section billets to produce hot-rolled H-beams with asymmetric flanges on both sides, in the face of problems such as diverse product specifications, large quality control difficulty of asymmetric profiled billets, and the serious impact of frequent billet type changes on the economy and production efficiency of the continuous casting process.

[0005] After retrieval, both the CN103557426A and CN113399453A documents proposed production methods for hot-rolled H-beams with unequal flange widths and thicknesses. However, the former is based on minor adjustments to conventional blooming pass designs and has strict limitations on the height, width, and ratios of the widths and thicknesses of the two flanges of the hot-rolled H-beam. For example, if the dimensions exceed the range, it will cause severe side bending during rolling or obvious wavy defects, affecting actual use. The latter controls the product and pass design based on equal flange areas on both sides and cannot form a combination of wide and thick flanges and narrow and thin flanges.

[0006] Therefore, there is no publicly disclosed method that can produce hot-rolled H-beams with asymmetric flanges on both sides using symmetric cross-section special-shaped billets, and the corresponding asymmetric hot-rolled H-beam products are also blank. Summary of the Invention

[0007] To solve the above technical problems, the present invention provides an asymmetric flange hot-rolled H-beam and its production method. Based on the existing symmetric cross-section special-shaped billet, a blooming pass with non-axisymmetric flanges on both sides is used to form an intermediate billet with a combination of "wide flange + thin web" and "narrow flange + thick web", and then it is formed by universal rolling. This not only controls the side bending during the rolling process but also can produce hot-rolled H-beams with asymmetric flanges on both sides in various specifications.

[0008] To achieve the above object, the technical solution adopted by the present invention to solve its technical problems is: The asymmetric flange hot-rolled H-beam includes a web, flange plate I, and flange plate II, and the difference in thickness between flange plate I and flange plate II |tf1 - tf2| > 0, and / or the difference in width between flange plate I and flange plate II |B1 - B2| > 0.

[0009] The range of the difference in thickness between flange plate I and flange plate II |tf1 - tf2| is 0.5 - 40 mm, and the range of the thickness tf1 of flange plate I and the thickness tf2 of flange plate II is 5 - 150 mm.

[0010] The range of the difference in width between flange plate I and flange plate II |B1 - B2| is 2 - 200 mm, and the range of the width B1 of flange plate I and the width B2 of flange plate II is 50 - 500 mm.

[0011] The range of the height H of the web is 100 - 1200 mm, and the range of the thickness tw of the web is 4 - 90 mm.

[0012] A production method of the asymmetric flange hot-rolled H-beam includes, in sequence, the production processes of converter smelting, shaped billet continuous casting, billet heating, blooming rolling, universal rolling, and air cooling. In the blooming rolling process, the pass profiles of the blooming passes include blooming pass I and blooming pass II. The blooming pass I includes a flange deformation zone I and a web deformation zone I that are connected. The blooming pass II includes a flange deformation zone II and a web deformation zone II that are connected. The width of the flange deformation zone I is greater than the width of the flange deformation zone II, and the thickness of the web deformation zone I is less than the thickness of the web deformation zone II.

[0013] The area S1 of the blooming pass I is greater than the area S2 of the blooming pass II. The ratio range of the area difference S1 - S2 between the blooming pass I and the blooming pass II to the area S2 of the blooming pass II is 0 to 10%.

[0014] The range of the difference b1 - b2 between the width of the flange deformation zone I and the width of the flange deformation zone II is 10 to 150 mm.

[0015] The range of the ratio h1 / h2 of the width of the web deformation zone I to the width of the web deformation zone II is 1.1 to 2.0.

[0016] Half e of the difference between the thickness of the web deformation zone II and the thickness of the web deformation zone I ranges from 1 to 15 mm.

[0017] In the universal rolling process, the ratio of the rolled piece to the width of the two flange plates of the H-beam finished product is equal.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides an asymmetric flange hot-rolled H-beam and its production method. Based on the existing shaped billet, a blooming pass profile with non-axisymmetric flanges on both sides is adopted. Utilizing the fact that the influence of web extension is stronger than that of flange extension, the excess extension of one side of the flange is offset by the excess extension of the other side of the web through the excess extension of one side of the web, forming an intermediate billet combined with "wide flange + thin web" and "narrow flange + thick web". It is rolled and formed by the existing universal rolling method, which not only controls the side bending during the rolling process but also can produce various specifications of asymmetric hot-rolled H-beams with non-symmetric flanges on both sides, including combinations such as "wide, thick flange" + "narrow, thin flange", "wide, thin flange" + "narrow, thick flange", "wide flange" + "narrow flange", "thick flange" + "thin flange", etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following briefly describes the content expressed in each drawing of the specification of the present invention and the marks in the drawings:

[0021] Figure 1 It is a schematic cross-sectional view of a shaped billet in the prior art;

[0022] Figure 2Schematic cross-sectional view of blooming rolling of hot-rolled H-beams in the prior art;

[0023] Figure 3 Schematic cross-sectional view of universal rolling of hot-rolled H-beams in the prior art;

[0024] Figure 4 Schematic structural view of the asymmetric flange hot-rolled H-beam of the present invention;

[0025] Figure 5 Schematic cross-sectional view of blooming rolling of the asymmetric flange hot-rolled H-beam of the present invention;

[0026] Figure 6 is Figure 5 schematic view of the blooming pass;

[0027] Figure 7 Schematic cross-sectional view of universal rolling of the asymmetric flange hot-rolled H-beam of the present invention;

[0028] The markings in the above figures are all: 1. web, 2. flange plate I, 3. flange plate II, 4. flange deformation zone I, 5. web deformation zone I, 6. flange deformation zone II, 7. web deformation zone II. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "wide flange", "narrow flange", "thin web", "thick web", "both sides", "two sides", "excessive extension", etc. are only for describing differences and do not specifically refer to specific dimensions, positions or deformation amounts, and therefore should not be construed as a limitation of the present invention.

[0032] The present invention provides an asymmetric flange hot-rolled H-beam, which includes flange plate I 2 and flange plate II 3 that are parallel to each other and a web 1 connected therebetween. The two sides of the web 1 are respectively perpendicular to the flange plate I 2 and the flange plate II 3. H represents the height of the web 1, B1 and B2 respectively represent the widths of the flange plate I 2 and the flange plate II 3, tf1 and tf2 respectively represent the thicknesses of the flange plate I 2 and the flange plate II 3, and tw represents the thickness of the web 1. The cross-sectional diagram and identification are as Figure 4 shown. The web 1, the flange plate I 2 and the flange plate II 3 are formed into an integral structure by hot-rolling a profiled billet. The cross-sectional shape of the profiled billet is as Figure 1 shown. Hb is the height of the profiled billet, Bb is the width of the profiled billet, twb is the thickness of the web 1, and tfb is the thickness of the flange.

[0033] The difference in thickness between the flange plate I 2 and the flange plate II 3, |tf1 - tf2| > 0, and / or the difference in width between the flange plate I 2 and the flange plate II 3, |B1 - B2| > 0, includes product combinations in forms such as "wide and thick flange" + "narrow and thin flange", "wide and thin flange" + "narrow and thick flange", "wide flange" + "narrow flange" (the thicknesses of the two sides of the flange are the same), "thick flange" + "thin flange" (the widths of the two sides of the flange are equal), etc.

[0034] Specifically, the height H of the web 1 ranges from 100 to 1200 mm, the widths B1 of the flange plate I 2 and B2 of the flange plate II 3 range from 50 to 500 mm, the thickness tw of the web 1 ranges from 4 to 90 mm, the thicknesses tf1 of the flange plate I 2 and tf2 of the flange plate II 3 range from 5 to 150 mm, the difference in width between the flange plate I 2 and the flange plate II 3, |B1 - B2|, ranges from 2 to 200 mm, and the difference in thickness between the flange plate I 2 and the flange plate II 3, |tf1 - tf2|, ranges from 0.5 to 40 mm. It is sufficient to satisfy one of the conditions for the value ranges of |B1 - B2| and |tf1 - tf2|, or all of them can be satisfied.

[0035] The setting basis for the dimensions of the above asymmetric flange hot-rolled H-beam is as follows:

[0036] If H is less than 100 mm, the product is not suitable for use as a beam; if H is greater than 1200 mm, the metal on the "thick web" side cannot flow smoothly to the "thin web" side during universal rolling, and rolling defects such as folding are likely to occur. Therefore, the range of H is controlled between 100 mm and 1200 mm.

[0037] If B1 or B2 is less than 50 mm, the practicality of the product with unequal-width flanges on both sides is poor; if B1 or B2 is greater than 500 mm, the height difference between the flanges on both sides of the blooming pass is too large, affecting the rolling stability. Therefore, the ranges of B1 and B2 are controlled between 50 mm and 500 mm.

[0038] If tw is less than 4 mm, the stability of the product as a beam is insufficient; if tw is greater than 90 mm, the space for adjusting the extension of the web 1 in the blooming pass is small, and an effective counteracting effect cannot be formed. Therefore, the range of tw is controlled between 4 mm and 90 mm.

[0039] If tf1 or tf2 is less than 5 mm, the difference formed by the unequal width or thickness of the two flanges is too small to be practical; if tf1 or tf2 is greater than 150 mm, the proportion of the flange metal in the blooming pass is much larger than that of the web 1, and the effect of the large extension of the web 1 cannot be fully utilized. Therefore, the ranges of tf1 and tf2 are controlled between 5 mm and 150 mm.

[0040] If |B1 - B2| is less than 2 mm, the difference formed by the unequal width of the two flanges is too small to be practical; if |B1 - B2| is greater than 200 mm, the height difference between the two flanges in the blooming pass is too large, affecting the rolling stability. Therefore, the range of |B1 - B2| is controlled between 2 mm and 200 mm.

[0041] The present invention also provides a production method of an asymmetric flange hot-rolled H-beam, which successively includes the production processes of converter smelting, special-shaped billet continuous casting, billet heating, blooming rolling, universal rolling, and air cooling. Of course, production processes can be added according to needs, such as: hot metal pretreatment (optional) → converter smelting or electric smelting → argon blowing refining (optional) → secondary refining (optional) → vacuum refining (optional) → special-shaped billet continuous casting → billet heating → blooming rolling → universal rolling → post-rolling controlled cooling (optional) → air cooling. The processes of hot metal pretreatment, argon blowing refining, secondary refining, vacuum refining, and post-rolling controlled cooling can be selected according to different product performances and processing technology requirements, and the remaining processes are the processes that must be adopted in the present invention.

[0042] The structure of the special-shaped billet adopted in the present invention is as Figure 1 shown in the special-shaped billet, and the billet production can be carried out according to the disclosed method. The billet heating is carried out by using a heating furnace according to the disclosed method to ensure that the rolled piece can be rolled and deformed at the set temperature.

[0043] The design concept of the present invention is: adopting a blooming pass with non-axisymmetric flanges on both sides, taking advantage of the fact that the influence of the extension of the web 1 is stronger than that of the flange extension, offsetting the excessive extension of one flange with the excessive extension of the other web 1 to form an intermediate billet combined with "wide flange + thin web" and "narrow flange + thick web", and then forming it by universal rolling, which not only controls the side bending during the rolling process but also can produce an asymmetric flange hot-rolled H-beam with non-symmetric flanges on both sides.

[0044] The schematic cross-sectional view of the blooming rolling of the asymmetric flange hot-rolled H-beam of the present invention is as Figure 5As shown, where BDH1 and BDH2 are the upper roll and the lower roll of the blooming mill respectively, and the shaded area represents the cross-section of the rolled piece; the schematic diagram of the universal rolling section of the asymmetric hot-rolled H-beam with two flanges is as Figure 7 shown, where UH1 and UH2 represent the upper horizontal roll and the lower horizontal roll of the universal mill respectively, and UV1 and UV2 represent the left vertical roll and the right vertical roll of the universal mill respectively, and the shaded area represents the cross-section of the rolled piece.

[0045] The method of the present invention adopts a special blooming pass and rolling method, and uses the existing profiled billet, universal rolling method and tooling. Therefore, it is applicable to asymmetric hot-rolled H-beams with two flanges of a wide range of specifications, including combined products in forms such as "wide and thick flange" + "narrow and thin flange", "wide and thin flange" + "narrow and thick flange", "wide flange" + "narrow flange", "thick flange" + "thin flange", etc.

[0046] The schematic diagram and identification of the blooming pass of the present invention are as Figure 6 shown. The pass of the blooming pass used in the blooming rolling process includes blooming pass I and blooming pass II. Blooming pass I includes a flange deformation zone I4 and a web deformation zone I5 that are connected. The blooming pass II includes a flange deformation zone II6 and a web deformation zone II7 that are connected. The width of the flange deformation zone I4 is greater than the width of the flange deformation zone II6, and the thickness of the web deformation zone I5 is less than the thickness of the web deformation zone II7. Among them, the flange deformation zone I4 and the web deformation zone I5 represent the pass of the "wide flange + thin web" side, and the flange deformation zone II6 and the web deformation zone II7 represent the pass of the "narrow flange + thick web" side. Where S1 and S2 represent the areas of blooming pass I and blooming pass II respectively, b1 and h1 represent the widths of the flange deformation zone I4 and the web deformation zone I5 respectively, b2 and h2 represent the widths of the flange deformation zone II6 and the web deformation zone II7 respectively, and e represents half of the difference between the thickness of the web deformation zone II7 and the thickness of the web deformation zone I5.

[0047] The present invention designs the two sides of the pass according to the principle of "wide flange + thin web" and "narrow flange + thick web". By adjusting the values of b1, b2, h1, h2 and e, (S1 - S2) / S2 is controlled within the range of 0 to 10%, and the total metal amount on both sides of the cross-section of the rolled piece is controlled within a certain range; to ensure that the excessive extension of the web 1 on one side can offset the excessive extension of the flange, b1 - b2 is controlled within the range of 10 mm to 150 mm, h1 / h2 is controlled within the range of 1.1 to 2.0, and e is within the range of 1 to 15 mm.

[0048] The setting basis of the dimensions of the above-mentioned blooming pass is as follows:

[0049] If (S1 - S2) / S2 is greater than 10%, during the blooming rolling process, due to the excessive metal flow rate per second on both sides of the rolled piece, the side bending will exceed the control range, which is likely to cause difficulties in biting and even lead to accidents such as the rolled piece running out. Therefore, (S1 - S2) / S2 is controlled within 0 - 10%.

[0050] If b1 - b2 is less than 10 mm, the difference between the two sides of the blooming pass is too small to form a sufficient difference in the amount of metal in the two side flanges; if b1 - b2 is greater than 150 mm, the height difference between the two side flanges of the blooming pass is too large, affecting the rolling stability. Therefore, b1 - b2 is controlled within 10 mm - 150 mm.

[0051] If h1 / h2 is less than 1.1, the area of the web deformation zone I5 ("thin web" pass) is insufficient and cannot offset the excess elongation brought by the flange deformation zone II6 ("narrow flange" pass), and the side bending will exceed the control range; if h1 / h2 is greater than 2.0, during the universal rolling stage, the metal on the "thick web" side cannot flow smoothly to the "thin web" side, and rolling defects such as folding are likely to occur. Therefore, h1 / h2 is controlled within 1.1 - 2.0.

[0052] If e is less than 1, the area of the web deformation zone I5 ("thin web") pass is insufficient and cannot offset the excess elongation brought by the flange deformation zone II6 ("narrow flange" pass), and the side bending will exceed the control range. Therefore, e is controlled to be not less than 1 mm but not more than 15 mm, otherwise, through-strip folding defects that cannot be flattened are likely to occur in the blooming section.

[0053] After the rolled piece is bloomed, the present invention cuts the head and tail of the rolled piece. According to the publicly known method, it is only necessary to ensure that the universal rolling can bite, and then a universal rolling method in the form of UR - E - UF or UR - E - UR - UF can be used, which can be reciprocating, semi - continuous or fully continuous. For the "thin web" and "thick web" combined intermediate billets formed before entering the universal rolling, the publicly known method can be used to flatten them by multi - pass rolling with horizontal rolls. Since there is space in the universal pass and multi - pass rolling is adopted, the resistance to transverse metal flow is small, and the uneven - thickness web 1 can be rolled flat. During the universal rolling, the width ratios of the rolled piece to the two flange plates of the H - beam finished product are equal.

[0054] Example 1

[0055] As shown in Table 1, the cross - sectional dimensions of the special - shaped billet used are: the height Hb of the special - shaped billet is 320 mm, the width Bb of the special - shaped billet is 220 mm, the thickness twb of the web 1 is 85 mm, and the thickness tfb of the flange is 65 mm.

[0056] The key control parameters of the blooming pass profile are as follows: the ratio of the difference between the areas of blooming pass I and blooming pass II to the area of blooming pass II, (S1 - S2) / S2 = 0; the difference between the width of flange deformation zone I (b1) and the width of flange deformation zone II (b2), b1 - b2 = 10 mm; the ratio of the width of web deformation zone I (h1) to the width of web deformation zone II (h2), h1 / h2 = 1.1; and half of the difference between the thickness of web deformation zone II (e) and the thickness of web deformation zone I, e = 1 mm.

[0057] The cross-sectional dimensions of the asymmetric flange hot-rolled H-beam obtained by the production method of the present invention are as follows: the height H of the web 1 is 100 mm, the width B1 of flange plate I 2 is 52 mm, the thickness tf1 of flange plate I 2 is 5.5 mm, the width B2 of flange plate II 3 is 50 mm, the thickness tf2 of flange plate II 3 is 5 mm, the thickness tw of the web 1 is 4 mm, |B1 - B2| = 2 mm, |tf1 - tf2| = 0.5 mm, resulting in a hot-rolled H-beam with "wide and thick flanges" + "narrow and thin flanges".

[0058] Example 2

[0059] As shown in Table 1, the cross-sectional dimensions of the special-shaped billet used are as follows: the height Hb of the special-shaped billet is 750 mm, the width Bb of the special-shaped billet is 450 mm, the thickness twb of the web 1 is 150 mm, and the thickness tfb of the flange is 105 mm.

[0060] The key control parameters of the blooming pass profile are as follows: the ratio of the difference between the areas of blooming pass I and blooming pass II to the area of blooming pass II, (S1 - S2) / S2 = 3%; the difference between the width of flange deformation zone I (b1) and the width of flange deformation zone II (b2), b1 - b2 = 20 mm; the ratio of the width of web deformation zone I (h1) to the width of web deformation zone II (h2), h1 / h2 = 1.2; and half of the difference between the thickness of web deformation zone II (e) and the thickness of web deformation zone I, e = 2 mm.

[0061] The cross-sectional dimensions of the asymmetric flange hot-rolled H-beam obtained by the production method of the present invention are as follows: the height H of the web 1 is 500 mm, the width B1 of flange plate I 2 is 250 mm, the thickness tf1 of flange plate I 2 is 30 mm, the width B2 of flange plate II 3 is 200 mm, the thickness tf2 of flange plate II 3 is 26 mm, the thickness tw of the web 1 is 12 mm, |B1 - B2| = 50 mm, |tf1 - tf2| = 4 mm, resulting in a hot-rolled H-beam with "wide and thick flanges" + "narrow and thin flanges".

[0062] Example 3

[0063] As shown in Table 1, the cross-sectional dimensions of the special-shaped blank used are as follows: the height Hb of the special-shaped blank is 900 mm, the width Bb of the special-shaped blank is 510 mm, the thickness twb of the web 1 is 130 mm, and the thickness tfb of the flange is 165 mm.

[0064] The key control parameters of the blooming pass profile are as follows: the ratio of the difference in area between blooming pass I and blooming pass II to the area of blooming pass II (S1 - S2) / S2 = 8%, the difference in width between flange deformation zone I 4 and flange deformation zone II 6 b1 - b2 = 100 mm, the ratio of the width of web deformation zone I 5 to the width of web deformation zone II 7 h1 / h2 = 1.7, and half of the difference in thickness between web deformation zone II 7 and web deformation zone I 5 e = 8 mm.

[0065] The cross-sectional dimensions of the hot-rolled H-beam with asymmetric flanges obtained by the production method of the present invention are as follows: the height H of the web 1 is 650 mm, the width B1 of flange plate I 2 is 300 mm, the thickness tf1 of flange plate I 2 is 36 mm, the width B2 of flange plate II 3 is 450 mm, the thickness tf2 of flange plate II 3 is 26 mm, the thickness tw of the web 1 is 16 mm, |B1 B2| = 150 mm, |tf1 tf2| = 10 mm, and the obtained hot-rolled H-beam is of the type with "narrow and thick flange" + "wide and thin flange".

[0066] Example 4

[0067] As shown in Table 1, the cross-sectional dimensions of the special-shaped blank used are as follows: the height Hb of the special-shaped blank is 1030 mm, the width Bb of the special-shaped blank is 440 mm, the thickness twb of the web 1 is 130 mm, and the thickness tfb of the flange is 112 mm.

[0068] The key control parameters of the blooming pass profile are as follows: the ratio of the difference in area between blooming pass I and blooming pass II to the area of blooming pass II (S1 - S2) / S2 = 2%, the difference in width between flange deformation zone I 4 and flange deformation zone II 6 b1 - b2 = 70 mm, the ratio of the width of web deformation zone I 5 to the width of web deformation zone II 7 h1 / h2 = 1.4, and half of the difference in thickness between web deformation zone II 7 and web deformation zone I 5 e = 6 mm.

[0069] The cross-sectional dimensions of the hot-rolled H-beam with asymmetric flanges obtained by the production method of the present invention are as follows: the height H of the web 1 is 850 mm, the width B1 of flange plate I 2 is 350 mm, the thickness tf1 of flange plate I 2 is 60 mm, the width B2 of flange plate II 3 is 300 mm, the thickness tf2 of flange plate II 3 is 40 mm, the thickness tw of the web 1 is 25 mm, |B1 B2| = 50 mm, |tf1 tf2| = 20 mm, and the obtained hot-rolled H-beam is of the type with "wide and thick flange" + "narrow and thin flange".

[0070] Example 5

[0071] As shown in Table 1, the cross-sectional dimensions of the special-shaped billet used are as follows: the height Hb of the special-shaped billet is 1300 mm, the width Bb of the special-shaped billet is 510 mm, the thickness twb of the web 1 is 140 mm, and the thickness tfb of the flange is 215 mm.

[0072] The key control parameters of the blooming pass profile are: the ratio of the difference in area between blooming pass I and blooming pass II to the area of blooming pass II (S1 - S2) / S2 = 10%, the difference in width between flange deformation zone I 4 and flange deformation zone II 6 b1 - b2 = 150 mm, the ratio of the width of web deformation zone I 5 to the width of web deformation zone II 7 h1 / h2 = 2.0, and half of the difference in thickness between web deformation zone II 7 and web deformation zone I 5 e = 10 mm.

[0073] The cross-sectional dimensions of the asymmetric flange hot-rolled H-beam obtained by the production method of the present invention are: the height H of the web 1 is 950 mm, the width B1 of flange plate I 2 is 500 mm, the thickness tf1 of flange plate I 2 is 150 mm, the width B2 of flange plate II 3 is 400 mm, the thickness tf2 of flange plate II 3 is 110 mm, the thickness tw of the web 1 is 90 mm, |B1 B2| = 100 mm, |tf1 tf2| = 40 mm, and the obtained hot-rolled H-beam is of "wide and thick flange" + "narrow and thin flange".

[0074] Example 6

[0075] As shown in Table 1, the cross-sectional dimensions of the special-shaped billet used are as follows: the height Hb of the special-shaped billet is 1300 mm, the width Bb of the special-shaped billet is 510 mm, the thickness twb of the web 1 is 140 mm, and the thickness tfb of the flange is 215 mm.

[0076] The key control parameters of the blooming pass profile are: the ratio of the difference in area between blooming pass I and blooming pass II to the area of blooming pass II (S1 - S2) / S2 = 10%, the difference in width between flange deformation zone I 4 and flange deformation zone II 6 b1 - b2 = 140 mm, the ratio of the width of web deformation zone I 5 to the width of web deformation zone II 7 h1 / h2 = 1.8, and half of the difference in thickness between web deformation zone II 7 and web deformation zone I 5 e = 10 mm.

[0077] The cross-sectional dimensions of the asymmetric flange hot-rolled H-beam obtained by the production method of the present invention are as follows: the height H of the web 1 is 1100 mm, the width B1 of the flange plate I 2 is 500 mm, the thickness tf1 of the flange plate I 2 is 45 mm, the width B2 of the flange plate II 3 is 300 mm, the thickness tf2 of the flange plate II 3 is 40 mm, the thickness tw of the web 1 is 30 mm, |B1 - B2| = 200 mm, |tf1 - tf2| = 5 mm, and the obtained hot-rolled H-beam has "wide and thick flanges" + "narrow and thin flanges".

[0078] Table 1 Relevant dimensional parameters of the profiled billets, blooming pass, and H-beams in Examples 1 to 6

[0079]

[0080]

[0081] In summary, based on the existing profiled billets, the present invention adopts a blooming pass with non-axisymmetric flanges on both sides. Utilizing the fact that the influence of web extension is stronger than that of flange extension, by over-extending one side of the web to offset the over-extension of the other side of the flange, an intermediate billet with a combination of "wide flange + thin web" and "narrow flange + thick web" is formed, and is rolled into shape by the existing universal rolling method. This not only controls the side bending during the rolling process but also can produce hot-rolled H-beams with non-symmetric flanges on both sides in various specifications.

[0082] As described above, only some principles of the present invention are illustrated by diagrams. This specification is not intended to limit the present invention to the specific structures and applicable scopes shown and described. Therefore, all possible corresponding modifications and equivalents that can be utilized belong to the scope of the patent applied for by the present invention.

Claims

1. A production method of an asymmetric flange hot-rolled H-beam, characterized in that, The asymmetric flange hot-rolled H-beam includes a web, flange plate I and flange plate II, and the difference in thickness between flange plate I and flange plate II, |tf1 - tf2| > 0, and / or the difference in width between flange plate I and flange plate II, |B1 - B2| > 0; The production method successively includes the production processes of converter smelting, shaped billet continuous casting, billet heating, blooming rolling, universal rolling, and air cooling. The pass shapes of the blooming passes used in the blooming rolling process include blooming pass I and blooming pass II. Blooming pass I includes a flange deformation zone I and a web deformation zone I that are connected. Blooming pass II includes a flange deformation zone II and a web deformation zone II that are connected. The width of the flange deformation zone I is greater than the width of the flange deformation zone II, and the thickness of the web deformation zone I is less than the thickness of the web deformation zone II.

2. The production method of the asymmetric flange hot-rolled H-shaped steel according to claim 1, characterized in that: The range of the difference in thickness between flange plate I and flange plate II, |tf1 - tf2|, is 0.5 to 40 mm, and the ranges of the thicknesses of flange plate I, tf1, and flange plate II, tf2, are 5 to 150 mm.

3. The production method of the asymmetric flange hot-rolled H-beam according to claim 1, characterized in that: The range of the difference in width between flange plate I and flange plate II, |B1 - B2|, is 2 to 200 mm, and the ranges of the widths of flange plate I, B1, and flange plate II, B2, are 50 to 500 mm.

4. The production method of the asymmetric flange hot-rolled H-shaped steel according to claim 1, characterized in that: The range of the height H of the web is 100 to 1200 mm, and the range of the thickness tw of the web is 4 to 90 mm.

5. The production method of the asymmetric flange hot-rolled H-shaped steel according to claim 1, characterized in that: The area S1 of blooming pass I is greater than the area S2 of blooming pass II, and the ratio of the difference in area between blooming pass I and blooming pass II, S1 - S2, to the area S2 of blooming pass II ranges from 0 to 10%.

6. The production method of the asymmetric flange hot-rolled H-shaped steel according to claim 1, characterized in that: The range of the difference in width between the flange deformation zone I and the flange deformation zone II, b1 - b2, is 10 to 150 mm.

7. The production method of the asymmetric flange hot-rolled H-beam according to claim 1, characterized in that: The ratio of the width of the web deformation zone I to the width of the web deformation zone II, h1 / h2, ranges from 1.1 to 2.

0.

8. The production method of the asymmetric flange hot-rolled H-shaped steel according to claim 1, characterized in that: Half of the difference in thickness between the web deformation zone II and the web deformation zone I, e, ranges from 1 to 15 mm.

9. The production method of the asymmetric flange hot-rolled H-beam according to claim 1, characterized in that: In the universal rolling process, the ratios of the width of the rolled piece to the widths of the two flange plates of the H-beam finished product are equal.

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