CN112474794B

CN112474794B - Cap-shaped steel rolling method and cap-shaped steel

Info

Publication number: CN112474794B
Application number: CN202011333466.5A
Authority: CN
Inventors: 丁朝晖; 吴保桥; 吴湄庄; 张建; 张卫斌; 彭林; 黄琦; 彦井成; 夏勐; 邢军; 何军委; 沈千成; 汪杰; 陈辉
Original assignee: Maanshan Iron and Steel Co Ltd
Current assignee: Maanshan Iron and Steel Co Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2022-07-29
Anticipated expiration: 2040-11-25
Also published as: WO2022111191A1; CN112474794A

Abstract

The invention discloses a cap-shaped steel rolling method and a cap-shaped steel; the rolling process flow comprises the following steps: heating → high-pressure water descaling → cogging and roughing → reciprocating continuous rolling → cooling → straightening; the rolling hole pattern comprises a wave-shaped flat arc pre-splitting hole, an M-shaped multi-type splitting hole, a multi-type finish rolling hole and a hot rolling finished product hole, the middle parts of the multi-type finish rolling hole and the hot rolling finished product hole are provided with arc sections, the two ends of each arc section are symmetrically provided with an upper leg part and a lower leg part, the upper end of each upper leg part is intersected with one end of each arc section to form an included angle, and the lower leg part is arranged at the lower end of one side, far away from the arc sections, of each upper leg part and is intersected with the upper leg part to form an included angle; the hat-shaped steel comprises a horizontal waist part, wherein vertical straight legs and horizontal flat legs are symmetrically arranged at two ends of the horizontal waist part respectively, and the flat legs are positioned on one sides of the straight legs far away from the waist part; the invention can effectively improve the production efficiency of the hat-shaped steel, improve the rolling stability, reduce the difficulty of process design and reduce the loss of roller equipment.

Description

Cap-shaped steel rolling method and cap-shaped steel

Technical Field

The invention relates to the field of hot-rolled section steel forming, in particular to a cap-shaped steel rolling method and cap-shaped steel.

Background

At present, the centre sill as bearing is arranged in the middle of the chassis after the truck chassis such as open top car, open top car and passenger train among the railway freight car is welded into the hat shape by two I-steel pieces to the roof beam, and the welding has increased the process, and the welding seam is perishable, need the aligning after welding, for guaranteeing intensity, needs increase thickness, the corresponding increase of cost. With the development of economy in China and the further speed increase of trains, higher requirements are also put forward on steel for railways. If the forming process of directly hot rolling the hat-shaped steel is adopted, the defects caused by welding can be avoided, the cost can be reduced, the working hours can be saved, and the weight can be reduced, so the production process has great economic benefit and social benefit.

The hot rolling hat-shaped steel, because the groove of pass is too deep, inhomogeneous deformation aggravates, the intensity of roll receives the influence, and product cross-section width is big, and the number of passes that can process on the limited roll body length reduces, and the deformation zone enlarges simultaneously and leads to the rolling force to increase, and pass design and technology arrange the degree of difficulty big. With the complexity of the product shape, the more the curved arcs are, the larger the product aspect ratio is, and the rolling force required in the product production process is increased. When hot rolling one-step forming is adopted, different work is generated on the same section, internal consumption is generated, and the service life of equipment spare parts such as a roll shaft, a universal joint, a speed ratio distribution box and the like is greatly shortened due to overlarge bearing capacity.

As the inner and outer eight corners of the hat-shaped steel are right angles, the hat-shaped steel is difficult to bite and take off the groove during rolling, and high requirements are provided for the hole pattern design and the hot rolling process. Limited by production process and equipment, cap-shaped steel cannot be rolled by domestic exterior steel mills at present, and how to reduce the design difficulty of the cap-shaped steel production process becomes a problem to be solved urgently by technical personnel in the field.

In the prior patent technology, for example, patent inventions with publication numbers of CN110142292A, CN110475623A and CN108160705A and patent inventions with publication number of CN1608759B respectively try different rolling methods of steel sheet piles and channel steels, but all have no rolling method and pass of hat-shaped steel lower legs; further, as disclosed in patent publication No. CN104438490A entitled hat section Steel Forming method, a method for rolling hat section Steel with strip Steel, which is a narrow and long steel plate, is disclosed, which cannot meet the demand of steel mills for producing hat section Steel from blanks; therefore, there is a strong need for a method of rolling hat section steel and a hat section steel to solve this problem.

Disclosure of Invention

The invention aims to provide a cap-shaped steel rolling method and cap-shaped steel, and aims to solve the problem that the prior art cannot meet the requirement of a steel mill for producing the cap-shaped steel through blanks.

In order to achieve the purpose, the invention provides the following technical scheme: a rolling method of hat-shaped steel comprises the following rolling process flows: heating → high-pressure water descaling → cogging and roughing → reciprocating continuous rolling → cooling → straightening; the rolling pass at least comprises a waved flat arc pre-splitting hole, an M-shaped multi-type splitting hole, a multi-type finish rolling hole and a hot rolling finished product hole according to the sequence of passes, the middle parts of the multi-type splitting hole, the multi-type finish rolling hole and the hot rolling finished product hole are provided with arc sections, the two ends of each arc section are symmetrically provided with an upper leg part and a lower leg part, the upper end of each upper leg part is intersected with one end of each arc section to form an included angle, and each lower leg part is arranged at the lower end of one side, far away from each arc section, of each upper leg part and is intersected with each upper leg part to form an included angle; the included angle between the upper leg part and the middle arc section from the sectional cutting hole to the hot rolling finished product hole and the inclination of the side wall of the upper leg part are gradually reduced according to the sequence of the passes.

Preferably, the rolling hole pattern comprises five rough rolling passes of a flat arc pre-splitting hole K11, a flat arc pre-splitting hole K10, a few-type splitting hole K9, a few-type splitting hole K8 and a few-type splitting hole K7, three middle rolling passes of a few-type finish rolling hole K6, a few-type finish rolling hole K5 and a few-type finish rolling hole K4, and three finish rolling passes of a few-type finish rolling hole K3, a few-type pre-forming hole K2 and a hot rolling finished product hole K1 in sequence of passes; the hot-rolled finished hole is in a shape of a Chinese character 'tu', and the remaining strokes of the lower part, the vertical part, the horizontal part and the vertical part are removed.

Preferably, the raw material adopts a 280mm multiplied by 550mm rectangular billet; the rough rolling pass rolling speed is 2.3-3.4 m/s, the rolling reduction of the flat arc pre-splitting hole K11 is 104mm, and the elongation is 1.187; the rolling reduction of the flat arc pre-splitting hole K10 is 36mm, and the elongation is 1.162; the rolling reduction of the sectional cutting hole K9 is 36mm, and the elongation is 1.157; the rolling reduction of the sectional cutting hole K8 is 20mm, and the elongation is 1.150; the rolling reduction of the sectional cut hole K7 is 23mm, and the elongation is 1.291; the rolling speed of the medium rolling pass is 1.8-3.0 m/s, the rolling reduction of the finishing rolling hole K6 is 19mm, and the elongation is 1.294; the rolling reduction of the geometric finishing rolling hole K5 is 13.1mm, and the elongation is 1.240; the rolling reduction of the finishing rolling hole K4 is 9.1mm, and the elongation is 1.304; the rolling speed of a finish rolling pass is 2.9-4.5 m/s, the rolling reduction of the sectional type finish rolling hole K3 is 5.3mm, and the elongation is 1.287; the rolling reduction of the n-shaped preformed hole K2 is 3.6mm, and the elongation is 1.267; the rolling reduction of the hot-rolled finished hole K1 is 2.9mm, the elongation is 1.216, the radius of each arc and the included angle of tangent lines at two ends of each arc of the flat arc pre-splitting hole K11 are as follows, beta 1-11: 10-80mm, 80-110 °, β 2-11: 10-100mm, 110-: 10-100mm, 90-110 °, β 4-11: 20-150mm, 135-165 DEG, beta 5-11: 10-100mm, 100-: 10-100mm, 140-: 10-100mm, 115-145 DEG, beta 8-11: 10-80mm, 110-: 10-80mm, 70-90 °; the radius of each arc of the flat arc pre-segmentation hole K10 and the included angle of tangent lines at two ends of each arc are as follows, beta 1-10: 10-100mm, 100-: 10-100mm, 95-120 °, β 3-10: 10-100mm, 70-100 °, β 4-10: 50-250mm, 140-: 10-100mm, 110-: 10-100mm, 110-: 40-150mm, 120-150 DEG, beta 9-10: 10-100mm, 70-90 °; the arc radiuses and included angles of tangent lines at two ends of each arc of the geometric segmentation hole K9 and the geometric segmentation hole K8 are as follows, beta 1-9: 10-200mm, 135-165 DEG, beta 3-9: 10-100mm, 60-90 °, β 4-9: 50-250mm, 120-: 10-100mm, 80-100 °, beta 6-9: 10-100mm, 85-110 degrees, beta 7-9: 10-50mm, 100-: 10-150mm, 120-150 DEG, beta 9-9: 10-150mm, 80-100 °; the radius of each circular arc of the geometric segmentation hole K7 and the included angle of tangent lines at two ends of the circular arc are as follows, beta 1-7: 20-120mm, 130-165 DEG, beta 3-7: 10-100mm, 60-90 °, beta 6-7: 10-100mm, 85-115 °, β 7-7: 10-50mm, 60-90 °, beta 9-7: 20-200mm, 90-120 °, θ 1-7: 150-; the radius of each circular arc of the finishing rolling hole K6 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-6: 10-200mm, 145-175 DEG,. beta.3-6: 10-100mm, 65-95 °, β 6-6: 10-100mm, 75-105 °, β 7-6: 5-20mm, 65-95 °, beta 9-6: 50-250mm, 100-: 150-; the radius of each circular arc of the finishing rolling hole K5 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-5: 10-200mm, 155-: 10-100mm, 65-95 °, β 6-5: 10-100mm, 75-105 °, β 7-5: 5-20mm, 65-95 degrees, beta 9-5: 50-250mm, 100-: 150-; the radius of each circular arc of the finishing rolling hole K4 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-4: 30-150mm, 155-: 5-50mm, 65-95 °, beta 6-4: 5-60mm, 75-100 °, beta 7-4: 5-10mm, 65-95 °, beta 9-4: 50-300mm, 110-: 200-: 10-100mm, 150-; the radius of each circular arc of the finishing rolling hole K3 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-3: 50-250mm, 160-175 DEG, beta 3-3: 5-50mm, 65-95 °, beta 6-3: 5-50mm, 70-95 °, beta 7-3: 1-8mm, 80-90 °, β 9-3: 200-: 400-800mm, 160-175 degrees; the radius of each arc of the preformed hole K2 and the included angle of the tangent lines at the two ends of the arc are as follows, beta 3-2: 5-40mm, 70-98 °, beta 6-2: 5-40mm, 70-98 °, beta 7-2: 1-5mm, 70-95 °, β 9-2: 400-800mm, 140-160 degree; the radius of each arc of the hot-rolled finished product hole K1 and the included angle of tangent lines at two ends of the arc are as follows, beta 3-1: 5-30mm, 70-100 °, beta 6-1: 5-30mm, 70-100 °, beta 7-1: 1-5mm, 70-100 °, β 9-1: 600-1200mm, 145-170 deg.

Preferably, the raw material adopts a slab with the thickness of 1000mm multiplied by 280 mm; the rough rolling pass rolling speed is 1.8-3.2 m/s, the rolling reduction of the flat arc pre-splitting hole K11 is 59mm, and the elongation is 1.200; the rolling reduction of the flat arc pre-splitting hole K10 is 46mm during rolling, and the elongation is 1.191; the rolling reduction of the sectional cutting hole K9 is 36mm, and the elongation is 1.042; the rolling reduction of the sectional cutting hole K8 is 20mm, and the elongation is 1.161; the rolling reduction of the sectional cut hole K7 is 23mm, and the elongation is 1.285; the rolling speed of the medium rolling pass is 2.0-3.5 m/s, the rolling reduction of the finishing rolling hole K6 is 19mm, and the elongation is 1.327; the rolling reduction of the finishing rolling hole K5 is 13mm, and the elongation is 1.263; the rolling reduction of the finishing rolling hole K4 is 9mm, and the elongation is 1.305; the rolling speed of the finish rolling pass is 2.6-4.2 m/s, the rolling reduction of the sectional type finish rolling hole K3 is 5.2mm, and the elongation is 1.296; the rolling reduction of the n-shaped preformed hole K2 is 3.5mm, and the elongation is 1.267; the rolling reduction of the hot-rolled finished hole K1 is 3.0mm, and the elongation is 1.212; the radius of each arc of the flat arc pre-cutting holes K11 and K10 and the included angle of the tangent lines at the two ends of each arc are as follows, beta 1-10: 40mm, 111 °, β 2-10: 50mm, 107.3 °, β 3-10: 85mm, 92.7 °, β 4-10: 230mm, 157 °, β 6-10: 80mm, 130.8 °, β 7-10: 32mm, 130.8 °, β 8-10: 80mm, 133.5 °, β 9-10: 90mm, 86 °; the arc radiuses and included angles of tangent lines at two ends of each arc of the geometric segmentation hole K9 and the geometric segmentation hole K8 are as follows, beta 1-9: 75mm, 150.1 °, β 3-9: 68mm, 80 °, β 4-9: 200mm, 138 °, β 5-9: 32mm, 88 °, β 6-9: 55mm, 103.6 °, β 7-9: 24mm, 121.9 °, β 8-9: 60mm, 137.2 °, β 9-9: 120mm, 94 °; the radius of each circular arc of the geometric segmentation hole K7 and the included angle of tangent lines at two ends of the circular arc are as follows, beta 1-7: 80mm, 154.9 °, β 3-7: 55mm, 80.1 °, β 6-7: 46mm, 105.5 °, β 7-7: 18mm, 79.9 °, β 9-7: 150mm, 108 °; the radius of each circular arc of the finishing rolling hole K6 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-6: 90mm, 160 °, β 3-6: 42mm, 81 °, β 6-6: 42mm, 92 °, β 7-6: 15mm, 81 °, β 9-6: 180mm, 118 °, θ 1-6: 150mm, 165 °; the radius of each circular arc of the finishing rolling hole K5 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-5: 90mm, 164 °, β 3-5: 30mm, 78.8 °, β 6-5: 32mm, 82.1 °, β 7-5: 8mm, 82 °, β 9-5: 200mm, 126 °, θ 1-5: 200mm, 166 °; the radius of each circular arc of the finishing rolling hole K4 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-4: 84.5mm, 164 °, β 3-4: 25mm, 84 °, β 6-4: 29.5mm, 92 °, β 7-4: 6mm, 84 °, β 9-4: 250mm, 152 °, θ 1-4: 400mm, 169 °, θ 2-4: 50mm, 163 °; the radius of each circular arc of the finishing rolling hole K3 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-3: 173mm, 163 °, β 3-3: 20mm, 84.5 °, β 6-3: 23.5mm, 91 °, β 7-3: 4mm, 78.6 °, β 9-3: 300mm, 159 °, θ 1-3: 600mm, 173 °; the radius of each arc of the preformed hole K2 and the included angle of the tangent lines at the two ends of the arc are as follows, beta 3-2: 18.8mm, 90 °, β 6-2: 18.8mm, 90 °, β 7-2: 2.5mm, 85.5 °, β 9-2: 600mm, 160 °; the radius of each arc of the hot-rolled finished product hole K1 and the included angle of tangent lines at two ends of the arc are as follows, beta 3-1: 15.2mm, 90 °, β 6-1: 15mm, 90 °, β 7-1: 2mm, 88.3 °, β 9-1: 900mm, 170.

Preferably, the heating is performed by a walking beam type heating furnace, the temperature of a soaking section of the heating furnace is controlled to be 1200-1280 ℃, no obvious black mark is generated on the surface of a billet, and the time of the soaking section is ensured to be more than or equal to 22 minutes.

Preferably, the working water pressure of the descaling machine in the high-pressure water descaling is more than or equal to 16MPa, so that the scale of the steel billet is completely removed, and the running speed of the steel billet is 0.5-2.5 m/s.

In any of the above solutions, the rolling pass further includes a box-type hole K12 before the flat arc pre-splitting hole, and the raw material is processed into a billet suitable for the flat arc pre-splitting hole through the box-type hole K12.

The invention also provides another technical scheme, and the cap-shaped steel comprises a horizontal waist part, wherein two ends of the horizontal waist part are respectively and symmetrically provided with a vertical straight leg and a horizontal flat leg, the straight leg is vertical to the waist part, and the flat leg is vertical to the straight leg and is positioned on one side of the straight leg, which is far away from the waist part.

Preferably, the fillet radius r2 between the upper end of the flat leg of the hat-shaped steel and the straight leg is 15mm, and the included angle α 2 between the upper end of the flat leg and the outer wall of the straight leg is 90 ° ± 0.5 °; the fillet radius r1 of straight leg inner wall and waist inner wall equals 15mm, and the contained angle alpha 1 of straight leg inner wall and waist inner wall equals 90 degrees +/-0.5 degrees.

Preferably, the height h of the cap-shaped steel is 310 +/-2 mm, and the inner width b1 is 350 +/-2 mm; the length b2 of the flat leg is 125 +/-3 mm, the thickness t3 is 18 +/-1 mm, the upper fillet radius r3 of the flat leg far away from one end of the straight leg is 7mm, and the lower fillet radius r4 is 2 mm; the straight leg thickness t2 is 12 +/-1 mm, and the waist thickness t1 is 12 +/-1 mm.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the cap-shaped steel rolling method, the cap-shaped steel is formed at one step through two stages of hot rolling and car straightening, so that the production efficiency and the rolling stability are effectively improved, the process design difficulty is reduced, and the loss of roller equipment is reduced.

2. The cap-shaped steel rolling method adopts the flat arc pre-splitting holes to facilitate the smooth transition of the rolled piece shape, so that the arc pre-splitting holes and the subsequent holes form side pressure on the waist part and the straight leg part of the rolled piece, and the metal at the waist part of the rolled piece flows to the straight leg part along with deformation by matching with the large side wall inclination, thereby creating conditions for reducing the abrasion of a middle finish rolling pass and stabilizing rolling.

3. According to the cap-shaped steel rolling method, the included angles between the upper leg parts and the horizontal section and the inclination of the side walls of the hole patterns of the several-type splitting holes, the several-type finish rolling holes and the several-type preformed holes are gradually reduced according to the sequence of the passes, and a large-bending hole pattern system is adopted from the splitting holes to the control holes so as to ensure that each hole can be smoothly bitten into and taken off the groove, and the waist part and the leg part can be well processed.

4. The cap-shaped steel adopts a one-step forming rolling process, and has the advantages of scientific and reasonable structure, safe and convenient use, simple and convenient operation, stable segmentation, easy biting and groove shedding, difficult roller winding of the whole pass system, small roller abrasion, long roller service life and contribution to improving the yield.

Drawings

FIG. 1 is a schematic view of the structure of the finished cap steel of the present invention;

FIG. 2 is a schematic structural view of one embodiment of a flat arc pre-slit aperture of the present invention;

FIG. 3 is a schematic structural view of one embodiment of a multi-segment slit of the present invention;

FIG. 4 is a schematic structural view of one embodiment of a multi-type finishing hole of the present invention;

FIG. 5 is a schematic structural view of one embodiment of a hot rolled finished hole of the present invention;

FIG. 6 is a schematic structural view of all rolling passes in examples 1 and 3 of the present invention;

FIG. 7 is a schematic view of the shape of the hole in K11 pass rolling in examples 1 and 3 of the present invention;

FIG. 8 is a schematic view of the hole shape of the K10 pass rolling in examples 1, 3 and 4, and is also a schematic view of the hole shape of the K11 pass rolling in example 4;

FIG. 9 is a schematic view of the shapes of the holes in K9 and K8 passes in examples 1, 3 and 4 of the present invention;

FIG. 10 is a schematic view showing the shape of a K7 pass rolled hole in examples 1, 3 and 4 of the present invention;

FIG. 11 is a schematic view showing the shape of a K6 pass rolled hole in examples 1, 3 and 4 of the present invention;

FIG. 12 is a schematic view showing the shape of a K5 pass rolled hole in examples 1, 3 and 4 of the present invention;

FIG. 13 is a schematic view showing the shape of a K4 pass rolled hole in examples 1, 3 and 4 of the present invention;

FIG. 14 is a schematic view showing the shape of a K3 pass rolled hole in examples 1, 3 and 4 of the present invention;

FIG. 15 is a schematic view showing the shape of a hole formed in K2 pass in examples 1, 3 and 4 of the present invention;

FIG. 16 is a schematic view showing the shape of the hole formed in K1 pass in examples 1, 3 and 4 of the present invention;

fig. 17 is a schematic structural view of all rolling passes in example 4 of the present invention.

Detailed Description

Example 1:

a rolling method of hat-shaped steel comprises the following rolling process flows: heating → high-pressure water descaling → cogging and roughing → reciprocating continuous rolling → cooling → straightening;

the heating can adopt a walking beam type heating furnace, the temperature of a soaking section of the heating furnace is preferably controlled to be 1200-1280 ℃, the surface of a steel billet is ensured not to have obvious black marks of a hearth pipe, and the time of the soaking section is ensured to be more than or equal to 30 minutes, preferably more than or equal to 33 minutes in the example;

the working water pressure of the descaling machine in the high-pressure water descaling is not lower than 16MPa, so that the scale of the steel billet is completely removed, the running speed of the steel billet can be controlled to be 0.5-2.5 m/s, and the preferable working water pressure is 1.5-2 m/s in the example;

during rolling, the rolling holes at least comprise a wavy flat arc pre-cutting hole (shown in figure 2), a few-type cutting hole (shown in figure 3), a few-type finishing rolling hole (shown in figure 4) and a hot rolling finished product hole (shown in figure 5) according to the sequence of passes, arc sections are arranged in the middle of the few-type cutting hole, the few-type finishing rolling hole and the hot rolling finished product hole, an upper leg portion and a lower leg portion are symmetrically arranged at two ends of each arc section, the upper end of each upper leg portion is intersected with one end of each arc section to form an included angle, and each lower leg portion is arranged at the lower end of one side, far away from the arc section, of each upper leg portion and is intersected with the upper leg portion to form an included angle; the included angle between the upper leg part and the middle arc section from the sectional holes to the hot rolled finished product hole and the inclination of the side wall of the upper leg part are gradually reduced according to the sequence of the passes, and the hole pattern is gradually changed from M to approximate to a 'sectional' shape; the flat arc-shaped pre-splitting holes are convenient for the shape of a rolled piece to be in smooth transition, the flat arc-shaped pre-splitting holes and the several-type splitting holes form side pressure on the waist part and the straight leg part of the rolled piece, and the waist metal of the rolled piece flows to the straight leg part along with deformation by matching with the large side wall inclination, so that conditions are created for reducing the abrasion of a middle finish rolling pass and stabilizing rolling;

In the preferred embodiment, the rolling raw material adopts a rectangular billet with the thickness of 280mm multiplied by 550mm, thereby providing favorable conditions for subsequent forming and widening; as shown in fig. 6, the rolled hole pattern in this embodiment includes five rough rolling passes of a flat arc pre-splitting hole K11, a flat arc pre-splitting hole K10, a few-type splitting hole K9, a few-type splitting hole K8 and a few-type splitting hole K7, three middle rolling passes of a few-type finish rolling hole K6, a few-type finish rolling hole K5 and a few-type finish rolling hole K4, and three finish rolling passes of a few-type finish rolling hole K3, a few-type pre-forming hole K2 and a hot-rolled finished hole K1 in sequence of passes, wherein the few-type pre-forming hole K2 is similar to the few-type finish rolling hole K3, and also has structures of an arc section, an upper leg portion and a lower leg portion; the rolling speed of the rough rolling pass is 2.3-3.4 m/s, the reduction and the uneven deformation are distributed in rough rolling as much as possible, the rough rolling extension hole is forcibly widened to meet the requirement of a deep cutting hole on the width of a blank, the reduction is 104mm when the flat arc-shaped pre-segmentation hole K11 is rolled, and the elongation is 1.187; the rolling reduction of the flat arc pre-splitting hole K10 is 36mm, and the elongation is 1.162; the rolling reduction of the sectional cutting hole K9 is 36mm, and the elongation is 1.157; the rolling reduction of the sectional cutting hole K8 is 20mm, and the elongation is 1.150; the rolling reduction of the sectional cut hole K7 is 23mm, and the elongation is 1.291; the rolling speed of the medium rolling pass is 1.8-3.0 m/s, the rolling reduction of the finishing rolling hole K6 is 19mm, and the elongation is 1.294; the rolling reduction of the geometric finishing rolling hole K5 is 13.1mm, and the elongation is 1.240; the rolling reduction of the finishing rolling hole K4 is 9.1mm, and the elongation is 1.304; the rolling speed of a finish rolling pass is 2.9-4.5 m/s, the rolling reduction of the sectional type finish rolling hole K3 is 5.3mm, and the elongation is 1.287; the rolling reduction of the n-shaped preformed hole K2 is 3.6mm, and the elongation is 1.267; the rolling reduction of the hot-rolled finished hole K1 is 2.9mm, and the elongation is 1.216; the rolling reduction and the guide can be finely adjusted according to the process requirements in the production;

In this embodiment, the design of each hole pattern is preferably as follows with reference to fig. 6 to 16, specifically, the radii of the arcs at each position of the flat arc pre-slit hole K11 (see fig. 7) and the included angles of the tangent lines at the two ends of the arcs are as follows, β 1 to 11: 10-80mm, 80-110 °, β 2-11: 10-100mm, 110-140 DEG, beta 3-11: 10-100mm, 90-110 °, β 4-11: 20-150mm, 135-165 DEG, beta 5-11: 10-100mm, 100-: 10-100mm, 140-: 10-100mm, 115-145 DEG, beta 8-11: 10-80mm, 110-: 10-80mm, 70-90 °; the radius of each arc of the flat arc pre-cutting hole K10 (shown in figure 8) and the included angle of tangent lines at two ends of the arc are as follows, beta 1-10: 10-100mm, 100-: 10-100mm, 95-120 °, β 3-10: 10-100mm, 70-100 °, β 4-10: 50-250mm, 140-: 10-100mm, 110-: 10-100mm, 110-: 40-150mm, 120-150 DEG, beta 9-10: 10-100mm, 70-90 °; the hole patterns of the sectional type cutting holes K9 and the sectional type cutting holes K8 are the same (see figure 9), the radius of each circular arc and the included angle of tangent lines at two ends of the circular arc are as follows, beta 1-9: 10-200mm, 135-165 DEG, beta 3-9: 10-100mm, 60-90 °, β 4-9: 50-250mm, 120-: 10-100mm, 80-100 °, beta 6-9: 10-100mm, 85-110 degrees, beta 7-9: 10-50mm, 100-: 10-150mm, 120-150 DEG, beta 9-9: 10-150mm, 80-100 °; the radius of each circular arc of the geometric segmentation hole K7 (shown in figure 10) and the included angle of tangent lines at two ends of the circular arc are as follows, beta 1-7: 20-120mm, 130-165 DEG, beta 3-7: 10-100mm, 60-90 °, beta 6-7: 10-100mm, 85-115 °, β 7-7: 10-50mm, 60-90 °, beta 9-7: 20-200mm, 90-120 °, θ 1-7: 150-; the radius of each circular arc of the finishing rolling hole K6 (shown in figure 11) and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-6: 10-200mm, 145-175 DEG,. beta.3-6: 10-100mm, 65-95 °, β 6-6: 10-100mm, 75-105 °, β 7-6: 5-20mm, 65-95 °, beta 9-6: 50-250mm, 100-: 150-; the radius of each circular arc of the finishing rolling hole K5 (shown in figure 12) and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-5: 10-200mm, 155-: 10-100mm, 65-95 °, β 6-5: 10-100mm, 75-105 °, β 7-5: 5-20mm, 65-95 degrees, beta 9-5: 50-250mm, 100-: 150-; the radius of each circular arc of the finishing rolling hole K4 (shown in figure 13) and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-4: 30-150mm, 155-: 5-50mm, 65-95 °, beta 6-4: 5-60mm, 75-100 °, beta 7-4: 5-10mm, 65-95 °, beta 9-4: 50-300mm, 110-: 200-: 10-100mm, 150-; the radius of each circular arc at each part of the finishing rolling hole K3 (shown in figure 14) and the included angle of tangent lines at two ends of the circular arc are as follows, beta 1-3: 50-250mm, 160-175 DEG, beta 3-3: 5-50mm, 65-95 °, beta 6-3: 5-50mm, 70-95 °, beta 7-3: 1-8mm, 80-90 °, β 9-3: 200-: 400-800mm, 160-175 degrees; the radius of each circular arc at each position of the preformed hole K2 (shown in figure 15) and the included angle of tangent lines at two ends of the circular arc are as follows, beta 3-2: 5-40mm, 70-98 °, beta 6-2: 5-40mm, 70-98 °, beta 7-2: 1-5mm, 70-95 °, β 9-2: 400-800mm, 140-160 degree; the radius of the circular arc at each position of the hot-rolled finished product hole K1 (shown in figure 16) and the included angle of the tangent lines at two ends of the circular arc are as follows, beta 3-1: 5-30mm, 70-100 °, beta 6-1: 5-30mm, 70-100 °, beta 7-1: 1-5mm, 70-100 °, β 9-1: 600-; it should be noted that the parts not marked in fig. 7-16 are straight line segments or smooth curve transitions or adjustments as needed, and the part of the arc of the lower part of the middle arc-shaped segment not marked can be an arc concentric with the upper part and can also be adjusted as needed; by adopting a large waist bending hole type system, each hole can be ensured to be smoothly bitten into and taken off from the groove, so that the waist and the legs are well processed; the large-inclination type hole pattern is adopted, so that the rolling stability is ensured, and the rolled piece is easy to strip the groove to fully ensure the shapes and the sizes of the leg part and the waist part;

The cooling can be generally carried out by adopting a roller way to transmit to a cooling bed; the straightening can adopt a nine-roller cantilever type straightener to meet the appropriate cross section curvature; after straightening, the surface of the product cannot have the defects of cracks, scabs, peeling, hairlines, folding, impurities and the like in the inspection process, and the product can be packaged and warehoused if the product is inspected to be free of defects.

In addition, the rolling pass can also comprise a box-shaped hole K12 before the flat arc pre-splitting hole, the raw material is processed into a billet suitable for the flat arc pre-splitting hole through the box-shaped hole K12, and the method can be well used through the box-shaped hole K12 if the rectangular billet similar to the example is not used.

Example 2:

the difference between the embodiment and the embodiment 1 is that the rolling pass comprises a flat arc pre-splitting hole K10, a few-type splitting hole K7, a few-type finish rolling hole K5, a few-type finish rolling hole K3 and a hot rolling finished product hole K1 according to the sequence of passes, other pass of the pass can be added between the passes, the total pass number does not need to be controlled to be 11 or 12, and a producer can adjust the pass as required; however, it is still necessary in principle to provide that the angle between the upper leg and the central arc and the inclination of the upper leg side wall from the several-segment slit opening to the hot-rolled finished product opening decrease in the sequence of passes.

Example 3:

the difference between the embodiment and the embodiment 1 is that the temperature of the soaking section of the heating furnace is controlled to be 1220-1280 ℃, and the working water pressure of a descaler in high-pressure water descaling is more than or equal to 20.5 MPa;

on the basis of the embodiment 1, the radius of each circular arc at each position of the flat arc pre-splitting hole K11 and the included angle of tangent lines at two ends of the circular arc are as follows, beta 1-11: 40mm, 93.9 °, β 2-11: 40mm, 125.9 °, β 3-11: 60mm, 96.7 °, β 4-11: 100mm, 150.8 °, β 5-11: 45mm, 118.3 °, β 6-11: 60mm, 153.3 °, β 7-11: 50mm, 130.3 °, β 8-11: 40mm, 128.7 °, β 9-11: 25mm, 77 °;

the radius of each arc of the flat arc pre-segmentation hole K10 and the included angle of tangent lines at two ends of each arc are as follows, beta 1-10: 40mm, 112.9 °, β 2-10: 50mm, 108.8 °, β 3-10: 60mm, 89.2 °, β 4-10: 180mm, 160 °, β 6-10: 50mm, 123.1 °, β 7-10: 40mm, 123.1 °, β 8-10: 80mm, 133.6 °, β 9-10: 28mm, 87 °;

the arc radiuses and included angles of tangent lines at two ends of each arc of the geometric segmentation hole K9 and the geometric segmentation hole K8 are as follows, beta 1-9: 68mm, 150 °, β 3-9: 48mm, 75 °, β 4-9: 140mm, 137 °, β 5-9: 32mm, 93 °, β 6-9: 45mm, 98 °, β 7-9: 24mm, 118 °, β 8-9: 60mm, 137 °, β 9-9: 45mm, 94 °;

The radius of each circular arc of the geometric segmentation hole K7 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-7: 80mm, 155 °, β 3-7: 40mm, 77 °, β 6-7: 42mm, 102.6 °, β 7-7: 18mm, 77 °, β 9-7: 82.5mm, 108 °, θ 1-7: 300mm, 163 °;

the radius of each circular arc of the finishing rolling hole K6 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-6: 73.7mm, 160 °, β 3-6: 40mm, 78 °, β 6-6: 42mm, 89 °, β 7-6: 10mm, 78 °, β 9-6: 127mm, 118 °, θ 1-6: 300mm, 164 °;

the radius of each circular arc of the finishing rolling hole K5 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-5: 90mm, 164 °, β 3-5: 30mm, 78.8 °, β 6-5: 37mm, 90 °, β 7-5: 8mm, 78.8 °, β 9-5: 173.5mm, 126 °, θ 1-5: 300mm, 166 °;

the radius of each circular arc of the finishing rolling hole K4 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-4: 84.5mm, 164 °, β 3-4: 25mm, 78.3 °, β 6-4: 29.5mm, 89 °, β 7-4: 6mm, 78.3 °, β 9-4: 188mm, 166 °, θ 1-4: 400mm, 170 °, θ 2-4: 50mm, 164 °;

the radius of each circular arc of the finishing rolling hole K3 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-3: 173mm, 163 °, β 3-3: 20mm, 80 °, β 6-3: 23.5mm, 88 °, β 7-3: 4mm, 74 °, β 9-3: 290mm, 134 °, θ 1-3: 600mm, 173 °;

The radius of each arc of the preformed hole K2 and the included angle of the tangent lines at the two ends of the arc are as follows, beta 3-2: 18.8mm, 87.5 °, β 6-2: 18.8mm, 87.5 °, β 7-2: 2.5mm, 83 °, β 9-2: 600mm, 160 °;

the radius of each arc of the hot-rolled finished product hole K1 and the included angle of tangent lines at two ends of the arc are as follows, beta 3-1: 15mm, 90 °, β 6-1: 15mm, 90 °, β 7-1: 2mm, 87.5 °, β 9-1: 900mm, 170.

Example 4:

the difference between the embodiment and the embodiment 1 is that a 1000mm × 230mm slab is adopted as a raw material; the temperature of the soaking section is controlled to be 1200-1280 ℃ during heating, and the time of the soaking section is more than or equal to 30 minutes; the working water pressure of the descaling machine in the high-pressure water descaling is more than or equal to 19MPa, and the running speed of the steel billet is 1.2-2.2 m/s; because the height of the slab with the thickness of 1000mm multiplied by 230mm is higher, the slab is not suitable for direct rolling, the height of the slab is reduced by adopting box-shaped holes, double drum shapes are eliminated according to the situation, and the slab is processed into a billet suitable for a flat arc pre-cutting hole;

referring to fig. 17, in the present embodiment, the rolling pass includes five rough rolling passes of the flat arc pre-splitting hole K11, the flat arc pre-splitting hole K10, the several-type splitting hole K9, the several-type splitting hole K8 and the several-type splitting hole K7, three middle rolling passes of the several-type finish rolling hole K6, the several-type finish rolling hole K5 and the several-type finish rolling hole K4, and three finish rolling passes of the several-type finish rolling hole K3, the several-type pre-forming hole K2 and the hot rolled finished hole K1 in sequence of passes; the flat arc pre-cut split holes in K11 and K10 passes are the same and are similar to the hole pattern shown in FIG. 8, the several split holes in K9 and K8 passes are the same and are similar to the hole pattern shown in FIG. 9, the K7 hole pattern is similar to that shown in FIG. 10, the K6 hole pattern is similar to that shown in FIG. 11, the K5 hole pattern is similar to that shown in FIG. 12, the K4 hole pattern is similar to that shown in FIG. 13, the K3 hole pattern is similar to that shown in FIG. 14, the K2 hole pattern is similar to that shown in FIG. 15, and the K1 hole pattern is similar to that shown in FIG. 16, so the radii of arcs and the tangential included angles of two ends of the arcs are described at the positions marked by FIGS. 8-16:

The radius of each arc of the flat arc pre-cutting holes K11 and K10 and the included angle of the tangent lines at the two ends of each arc are as follows, beta 1-10: 40mm, 111 °, β 2-10: 50mm, 107.3 °, β 3-10: 85mm, 92.7 °, β 4-10: 230mm, 157 °, β 6-10: 80mm, 130.8 °, β 7-10: 32mm, 130.8 °, β 8-10: 80mm, 133.5 °, β 9-10: 90mm, 86 °;

the arc radiuses and included angles of tangent lines at two ends of each arc of the geometric segmentation hole K9 and the geometric segmentation hole K8 are as follows, beta 1-9: 75mm, 150.1 °, β 3-9: 68mm, 80 °, β 4-9: 200mm, 138 °, β 5-9: 32mm, 88 °, β 6-9: 55mm, 103.6 °, β 7-9: 24mm, 121.9 °, β 8-9: 60mm, 137.2 °, β 9-9: 120mm, 94 °;

the radius of each circular arc of the geometric segmentation hole K7 and the included angle of tangent lines at two ends of the circular arc are as follows, beta 1-7: 80mm, 154.9 °, β 3-7: 55mm, 80.1 °, β 6-7: 46mm, 105.5 °, β 7-7: 18mm, 79.9 °, β 9-7: 150mm, 108 °;

the radius of each circular arc of the finishing rolling hole K6 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-6: 90mm, 160 °, β 3-6: 42mm, 81 °, β 6-6: 42mm, 92 °, β 7-6: 15mm, 81 °, β 9-6: 180mm, 118 °, θ 1-6: 150mm, 165 °;

the radius of each circular arc of the finishing rolling hole K5 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-5: 90mm, 164 °, β 3-5: 30mm, 78.8 °, β 6-5: 32mm, 82.1 °, β 7-5: 8mm, 82 °, β 9-5: 200mm, 126 °, θ 1-5: 200mm, 166 °;

The radius of each circular arc of the finishing rolling hole K4 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-4: 84.5mm, 164 °, β 3-4: 25mm, 84 °, β 6-4: 29.5mm, 92 °, β 7-4: 6mm, 84 °, β 9-4: 250mm, 152 °, θ 1-4: 400mm, 169 °, θ 2-4: 50mm, 163 °;

the radius of each circular arc of the finishing rolling hole K3 and the included angle of the tangent lines at the two ends of the circular arc are as follows, beta 1-3: 173mm, 163 °, β 3-3: 20mm, 84.5 °, β 6-3: 23.5mm, 91 °, β 7-3: 4mm, 78.6 °, β 9-3: 300mm, 159 °, θ 1-3: 600mm, 173 °;

the radius of each arc of the preformed hole K2 and the included angle of the tangent lines at the two ends of the arc are as follows, beta 3-2: 18.8mm, 90 °, β 6-2: 18.8mm, 90 °, β 7-2: 2.5mm, 85.5 °, β 9-2: 600mm, 160 °;

the radius of each arc of the hot-rolled finished product hole K1 and the included angle of tangent lines at two ends of the arc are as follows, beta 3-1: 15.2mm, 90 °, β 6-1: 15mm, 90 °, β 7-1: 2mm, 88.3 °, β 9-1: 900mm, 170 °;

in the embodiment, the rolling speed of the rough rolling pass is 1.8-3.2 m/s, the rolling reduction of the flat arc pre-splitting hole K11 is 59mm, and the elongation is 1.200; the rolling reduction of the flat arc pre-splitting hole K10 is 46mm during rolling, and the elongation is 1.191; the rolling reduction of the sectional cutting hole K9 is 36mm, and the elongation is 1.042; the rolling reduction of the sectional cutting hole K8 is 20mm, and the elongation is 1.161; the rolling reduction of the sectional cut hole K7 is 23mm, and the elongation is 1.285; the rolling speed of the medium rolling pass is 2.0-3.5 m/s, the rolling reduction of the finishing rolling hole K6 is 19mm, and the elongation is 1.327; the rolling reduction of the finishing rolling hole K5 is 13mm, and the elongation is 1.263; the rolling reduction of the finishing rolling hole K4 is 9mm, and the elongation is 1.305; the rolling speed of the finish rolling pass is 2.6-4.2 m/s, the rolling reduction of the sectional type finish rolling hole K3 is 5.2mm, and the elongation is 1.296; the rolling reduction of the n-shaped preformed hole K2 is 3.5mm, and the elongation is 1.267; the rolling reduction of the hot-rolled finished hole K1 is 3.0mm, and the elongation is 1.212; the rolling reduction and the guide can be finely adjusted according to the process requirements in the production.

Example 5:

referring to fig. 1, a hat-shaped steel is formed in one step by the method of the present invention, and comprises a horizontal waist portion 3, wherein two ends of the horizontal waist portion 3 are respectively and symmetrically provided with a vertical straight leg 2 and a horizontal flat leg 1, the straight leg 2 is perpendicular to the waist portion 3, and the flat leg 1 is perpendicular to the straight leg 2 and is located on one side of the straight leg 2 away from the waist portion 3; the cap-shaped steel can be plain carbon steel, low alloy steel, weathering steel or the like, and particularly Q450NQR1 weathering steel can be adopted.

In this embodiment, the fillet radius r2 between the upper end of the flat leg 1 of the hat-shaped steel and the straight leg 2 is 15mm, and the included angle α 2 between the upper end of the flat leg 1 and the outer wall of the straight leg 2 is 90 ° ± 0.5 °; the fillet radius r1 between the inner wall of the straight leg 2 and the inner wall of the waist part 3 is 15mm, and the included angle alpha 1 between the inner wall of the straight leg 2 and the inner wall of the waist part 3 is 90 degrees +/-0.5 degrees; furthermore, the height h of the hat-shaped steel is 310 +/-2 mm, and the inner width b1 is 350 +/-2 mm; the length b2 of the flat leg 1 is 125 +/-3 mm, the thickness t3 is 18 +/-1 mm, the upper fillet radius r3 of the flat leg 1 far away from one end of the straight leg 2 is 7mm, and the lower fillet radius r4 is 2 mm; the thickness t2 of the straight leg 2 is 12 +/-1 mm, and the thickness t1 of the waist part 3 is 12 +/-1 mm.

The cap-shaped steel has the advantages of scientific and reasonable structure, safe and convenient use, simple and convenient operation, stable segmentation and easy engagement and disengagement; the hot rolling one shot forming has avoided the welding defect that probably produces with two B steel concatenations, effectively prevents the crackle, reduces the maintenance frequency, does benefit to the life who improves the vehicle.

It can also be seen from this embodiment 5 that the important pass in the first 4 embodiments of the present invention is the hot rolled finished hole (see fig. 16) of the last rolling pass, which is in the shape of a "convex" with the left strokes of the lower part left in the vertical and horizontal directions removed, and also similar to a "few" shape, and also similar to a hat, because other process flows are performed after the rolling of this pass, the pass will directly affect the structure and shape of the final product, usually the upper leg of the pass is in the shape of a straight plate, and the middle arc-shaped section and the lower leg are in the shape of a curved surface close to the straight plate, which is beneficial to straightening and forming, but does not exclude the curved surface of the upper leg, all straight plates, or curved directions, and the hat-shaped steel shown in fig. 1 can be finally obtained; however, since the finished hole is not a control hole (the hole with narrower openings at both ends belongs to a control hole in the figure, for example, fig. 3, but fig. 2, 4 and 5 are not control holes), the former control hole, for example, the multi-type preformed hole K2 or the multi-type finish rolling hole K3, plays a role in controlling the structure and shape of the final product.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention; for example, it is obvious that a section steel having a different size from the hat section steel of the present invention can be obtained from billet stock of a different size; for another example, by adjusting the size of the hole type system, hat section steel with different proportions of the flat leg 1, the straight leg 2 and the waist 3 from the present invention can also be obtained; for another example, the radii and angles of the pass types of the flat arc pre-slit hole K11, the flat arc pre-slit hole K10, the several-type slit hole K9, the several-type slit hole K8, the several-type slit hole K7, the several-type finish rolling hole K6, the several-type finish rolling hole K5, the several-type finish rolling hole K4, the several-type finish rolling hole K3, the several-type pre-forming hole K2, and the hot rolled finished product hole K1 may be adjusted even in the form, and particularly, the flat arc pre-slit hole may be largely changed due to the particularity of the steel rolling field. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

The details of the present invention are not described in detail, but are known to those skilled in the art.

Claims

1. The method for rolling the hat-shaped steel is characterized in that the rolling process flow comprises the following steps: heating → high-pressure water descaling → cogging rough rolling → reciprocating continuous rolling → cooling → straightening; the rolling pass at least comprises a waved flat arc pre-splitting hole, an M-shaped multi-type splitting hole, a multi-type finish rolling hole and a hot rolling finished product hole according to the sequence of passes, the middle parts of the multi-type splitting hole, the multi-type finish rolling hole and the hot rolling finished product hole are provided with arc sections, the two ends of each arc section are symmetrically provided with an upper leg part and a lower leg part, the upper end of each upper leg part is intersected with one end of each arc section to form an included angle, and each lower leg part is arranged at the lower end of one side, far away from each arc section, of each upper leg part and is intersected with each upper leg part to form an included angle; the included angle between the upper leg part and the middle arc section from the geometric type cutting hole to the hot rolling finished product hole and the inclination of the side wall of the upper leg part are gradually reduced according to the sequence of the passes;

the rolling hole type comprises five rough rolling passes of a flat arc pre-splitting hole K11, a flat arc pre-splitting hole K10, a few-type splitting hole K9, a few-type splitting hole K8 and a few-type splitting hole K7, three middle rolling passes of a few-type finish rolling hole K6, a few-type finish rolling hole K5 and a few-type finish rolling hole K4, and three finish rolling passes of a few-type finish rolling hole K3, a few-type pre-forming hole K2 and a hot-rolled finished product hole K1 according to the sequence of the passes; the hot-rolled finished product hole is in a shape of a Chinese character 'tu', the lower part of the hole is removed, and the left strokes of the hole are vertical, horizontal and vertical;

The raw material adopts rectangular billet steel;

arc radius and the arc both ends tangent line contained angle are as follows everywhere in flat arc pre-segmentation hole K11, correspond the protruding circular arc of lower extreme outside angle of shank department under several formulas segmentation hole K9: 10-80mm, 80-110 °, corresponding to the convex arc of the lower end inside corner of the lower leg of the formula cut-off hole K9: 10-100mm, 110-140 degrees, corresponding to the concave arc at the included angle between the lower part of the arc-shaped section of the sectional hole K9 and the upper leg part: 10-100mm, 90-110 °, corresponding to the lower convex arc at the arc segment of the several-type split hole K9: 20-150mm, 135-165 degrees, corresponding to the convex arc of the upper end outer side angle at the lower leg part of the sectional hole K9: 10-100mm, 100-: 10-100mm, 140-160 degrees, corresponding to the convex arc of the upper end outer side angle at the upper leg part of the sectional hole K9: 10-100mm, 115-145 degrees, corresponding to the convex arc at the included angle between the upper part of the arc-shaped section of the sectional splitting hole K9 and the upper leg part: 10-80mm, 110-140 degrees, corresponding to the upper concave arc at the arc section of the sectional holes K9: 10-80mm, 70-90 °;

arc radius and the arc both ends tangent line contained angle are as follows everywhere in flat arc pre-segmentation hole K10, correspond the protruding circular arc of lower extreme outside angle of shank department under several formulas segmentation hole K9: 10-100mm, 100-130 degrees, corresponding to the convex arc of the lower end inner side angle at the lower leg part of the several-type splitting hole K9: 10-100mm, 95-120, correspond several formula segmentation hole K9 arc section lower part and the concave circular arc of last shank contained angle department: 10-100mm, 70-100 °, corresponding to the lower convex arc at the arc segment of the several-type cutting hole K9: 50-250mm, 140-170 degrees, and the concave arc corresponding to the upper end inner side angle at the lower leg part of the sectional hole K9: 10-100mm, 110-135 degrees, corresponding to the convex arc of the upper end outer side angle at the upper leg part of the sectional hole K9: 10-100mm, 110-: 40-150mm, 120-150 degrees, corresponding to the upper concave arc at the arc section of the sectional holes K9: 10-100mm, 70-90 °;

The arc radius and the tangent included angle of the two ends of each arc of the several-type segmentation hole K9 and the several-type segmentation hole K8 are as follows, and the bottom surface of the lower leg is concave: 10-200mm, 135 + 165 degrees, concave arc of the included angle between the lower part of the arc section and the upper leg part: 10-100mm, 60-90 degrees, arc section lower part convex arc: 50-250mm, 120-150 degrees, convex arc of outer side angle of upper end of lower leg part: 10-100mm, 80-100 degrees, and concave arc of the inner side angle of the upper end of the lower leg part: 10-100mm, 85-110 degrees, convex arc of upper leg outer side angle: 10-50mm, 100-: 10-150mm, 120-150 DEG, and the upper part of the arc-shaped section is concave: 10-150mm, 80-100 °;

the arc radius and the tangent included angle of the two ends of the arc at each position of the n-shaped cutting hole K7 are as follows, and the bottom surface of the lower leg is concave: 20-120mm, 130-165 degrees, and the included angle between the lower part of the arc section and the upper leg part is concave arc: 10-100mm, 60-90 degrees, concave arc of upper end inner side angle of lower leg: 10-100mm, 85-115 degrees, convex arc of upper leg outer side angle: 10-50mm, 60-90 degrees, arc section upper concave arc: 20-200mm, 90-120 degrees, concave arc in the middle of the inner side of the upper leg part: 150-;

the circular arc radius and the tangent included angle of the two ends of the circular arc at each part of the finishing rolling hole K6 are as follows, and the bottom surface of the lower leg is a concave circular arc: 10-200mm, 145-175 degrees, and the included angle between the lower part of the arc section and the upper leg part is concave arc: 10-100mm, 65-95 degrees, and concave arc of the inner side angle of the upper end of the lower leg part: 10-100mm, 75-105 degrees, convex arc of upper leg outer side angle: 5-20mm, 65-95 degrees, the upper part of the arc section is concave: 50-250mm, 100-: 150-;

The circular arc radius and the circular arc both ends tangent included angle of several formulas finish rolling hole K5 everywhere are as follows, the concave circular arc of shank bottom surface down: 10-200mm, 155-: 10-100mm, 65-95 degrees, concave arc of upper end inner side angle of lower leg: 10-100mm, 75-105 degrees, convex arc of upper leg outer side angle: 5-20mm, 65-95 degrees, the upper part of the arc section is concave: 50-250mm, 100-: 150-;

the circular arc radius and the tangent included angle of the two ends of the circular arc at each part of the finishing rolling hole K4 are as follows, and the bottom surface of the lower leg is a concave circular arc: 30-150mm, 155-: 5-50mm, 65-95 degrees, and the concave arc of the inner side angle of the upper end of the lower leg part: 5-60mm, 75-100 degrees, convex arc of upper leg outer side angle: 5-10mm, 65-95 degrees, the upper part of the arc section is concave: 50-300mm, 110-140 degrees, concave arc at the middle part of the inner side of the upper leg part: 200, 600mm, 150, 175 degrees, the included angle between the upper part of the arc section and the upper leg part is concave: 10-100mm, 150-;

the circular arc radius and the tangent included angle of the two ends of the circular arc at each part of the finishing rolling hole K3 are as follows, and the bottom surface of the lower leg is a concave circular arc: 50-250mm, 160-175 degrees, and the included angle between the lower part of the arc section and the upper leg part is concave arc: 5-50mm, 65-95 degrees, and the concave arc of the inner side angle of the upper end of the lower leg part: 5-50mm, 70-95 degrees, convex arc of upper leg outer side angle: 1-8mm, 80-90 degrees, arc section upper part concave arc: 200-400mm, 120-150 degrees, and the middle part of the inner side of the upper leg part is concave: 400-800mm, 160-175 degrees;

The arc radius of each part of the preformed hole K2 and the included angle of the tangent lines at the two ends of the arc are as follows, and the included angle of the lower part of the arc section and the upper leg part is a concave arc: 5-40mm, 70-98 degrees, and the concave arc of the inner side angle of the upper end of the lower leg part: 5-40mm, 70-98 degrees, convex arc of upper leg outer side angle: 1-5mm, 70-95 degrees, the upper part of the arc section is concave: 400-800mm, 140-160 degree;

the radius of each arc of the hot-rolled finished product hole K1 and the included angles of the tangent lines at the two ends of the arc are as follows, and the included angle between the lower part of the arc section and the upper leg part is a concave arc: 5-30mm, 70-100 degrees, concave arc of upper inner side angle of lower leg: 5-30mm, 70-100 degrees, convex arc of upper leg outer side angle: 1-5mm, 70-100 degrees, the upper part of the arc section is concave: 600-.

2. The method of rolling hat section steel according to claim 1, wherein: the raw material adopts a rectangular billet with the thickness of 280mm multiplied by 550 mm; the rough rolling pass rolling speed is 2.3-3.4 m/s, the rolling reduction of the flat arc pre-splitting hole K11 is 104mm, and the elongation is 1.187; the rolling reduction of the flat arc pre-splitting hole K10 is 36mm, and the elongation is 1.162; the rolling reduction of the sectional cutting hole K9 is 36mm, and the elongation is 1.157; the rolling reduction of the sectional cutting hole K8 is 20mm, and the elongation is 1.150; the rolling reduction of the sectional cut hole K7 is 23mm, and the elongation is 1.291; the rolling speed of the medium rolling pass is 1.8-3.0 m/s, the rolling reduction of the finishing rolling hole K6 is 19mm, and the elongation is 1.294; the rolling reduction of the geometric finishing rolling hole K5 is 13.1mm, and the elongation is 1.240; the rolling reduction of the finishing rolling hole K4 is 9.1mm, and the elongation is 1.304; the rolling speed of a finish rolling pass is 2.9-4.5 m/s, the rolling reduction of the sectional type finish rolling hole K3 is 5.3mm, and the elongation is 1.287; the rolling reduction of the n-shaped preformed hole K2 is 3.6mm, and the elongation is 1.267; the rolling reduction of the hot rolled finished hole K1 was 2.9mm, and the elongation was 1.216.

3. The method of rolling hat section steel according to claim 1, wherein: the heating is carried out by adopting a walking beam type heating furnace, the temperature of a soaking section of the heating furnace is controlled to be 1200-1280 ℃, no obvious furnace bottom tube black mark exists on the surface of a steel billet, and the time of the soaking section is ensured to be more than or equal to 22 minutes.

4. The method of rolling hat section steel according to claim 1, wherein: the working water pressure of the descaling machine in the high-pressure water descaling process is more than or equal to 16MPa, so that the scale of the steel billet can be completely removed, and the running speed of the steel billet is 0.5-2.5 m/s.

5. The method of rolling hat section steel according to any one of claims 1 to 4, wherein: the rolling pass also comprises a box-shaped hole K12 before the flat arc pre-splitting hole, and the raw material is processed into a billet suitable for the flat arc pre-splitting hole through the box-shaped hole K12.

6. The method for rolling the hat-shaped steel is characterized in that the rolling process flow comprises the following steps: heating → high-pressure water descaling → cogging and roughing → reciprocating continuous rolling → cooling → straightening; the rolling pass at least comprises a waved flat arc pre-splitting hole, an M-shaped multi-type splitting hole, a multi-type finish rolling hole and a hot rolling finished product hole according to the sequence of passes, the middle parts of the multi-type splitting hole, the multi-type finish rolling hole and the hot rolling finished product hole are provided with arc sections, the two ends of each arc section are symmetrically provided with an upper leg part and a lower leg part, the upper end of each upper leg part is intersected with one end of each arc section to form an included angle, and each lower leg part is arranged at the lower end of one side, far away from each arc section, of each upper leg part and is intersected with each upper leg part to form an included angle; the included angle between the upper leg part and the middle arc section from the geometric type cutting hole to the hot rolling finished product hole and the inclination of the side wall of the upper leg part are gradually reduced according to the sequence of the passes;

the raw material adopts a slab with the thickness of 1000mm multiplied by 280 mm;

the arc radius and the arc both ends tangent line contained angle of each place of flat arc pre-segmentation hole K11 and flat arc pre-segmentation hole K10 are as follows, correspond the protruding circular arc of the lower extreme outside corner of shank department under several formulas segmentation hole K9: 40mm, 111, correspond several formulas segmentation hole K9 lower extreme medial angle convex arc of shank department: 50mm, 107.3, correspond several formula segmentation hole K9 arc section lower part and the concave circular arc of last shank contained angle department: 85mm, 92.7 degrees, corresponding to the lower convex arc at the arc segment of the sectional cutting hole K9: 230mm, 157 degrees, corresponding to the concave arc of the upper end inner side angle at the lower leg part of the sectional hole K9: 80mm, 130.8, correspond several formulas segmentation hole K9 upper end outside corner convex circular arc of shank department: 32mm, 130.8, correspond several formula segmentation hole K9 arc section upper portion and the protruding circular arc of last shank contained angle department: 80mm, 133.5 °, corresponding to the upper concave arc at the arc segment of the several-type split hole K9: 90mm, 86 °;

The arc radius and the tangent included angle of the two ends of each arc of the several-type segmentation hole K9 and the several-type segmentation hole K8 are as follows, and the bottom surface of the lower leg is concave: 75mm, 150.1 °, arc segment lower part and last shank contained angle concave arc: 68mm, 80 °, convex arc at the lower part of the arc segment: 200mm, 138 °, lower leg upper end outer side angle convex arc: 32mm, 88 degrees, concave arc of upper end inside angle of lower leg: 55mm, 103.6 °, convex arc of upper leg outer side angle: 24mm, 121.9 °, arc segment upper portion and last shank contained angle convex arc: 60mm, 137.2 °, concave arc at the upper part of the arc section: 120mm, 94 °;

the arc radius and the tangent included angle of the two ends of the arc at each position of the n-shaped cutting hole K7 are as follows, and the bottom surface of the lower leg is concave: 80mm, 154.9 degrees, the arc section lower part and last shank contained angle concave arc: 55mm, 80.1 °, concave arc of upper end inside corner of lower leg: 46mm, 105.5 °, convex arc of upper leg outer corner: 18mm, 79.9 °, concave arc at the upper part of the arc segment: 150mm, 108 °;

the circular arc radius and the tangent included angle of the two ends of the circular arc at each part of the finishing rolling hole K6 are as follows, and the bottom surface of the lower leg is a concave circular arc: 90mm, 160 °, arc section lower part and last shank contained angle concave arc: 42mm, 81 degrees, concave arc of upper end inside angle of lower leg: 42mm, 92 °, convex arc of upper leg upper end outer side angle: 15mm, 81 °, arc segment upper portion concave arc: 180mm, 118 °, concave arc in the middle of the inner side of the upper leg: 150mm, 165 °;

The circular arc radius and the tangent included angle of the two ends of the circular arc at each part of the finishing rolling hole K5 are as follows, and the bottom surface of the lower leg is a concave circular arc: 90mm, 164 °, arc-shaped section lower part and last shank contained angle concave arc: 30mm, 78.8 degrees, concave arc of upper end inside corner of lower leg: 32mm, 82.1 °, convex arc of upper leg outer corner: 8mm, 82 °, arc segment upper portion concave arc: 200mm, 126 °, concave arc in the middle of the inner side of the upper leg: 200mm, 166 °;

the circular arc radius and the tangent included angle of the two ends of the circular arc at each part of the finishing rolling hole K4 are as follows, and the bottom surface of the lower leg is a concave circular arc: 84.5mm, 164 degrees, the lower part of the arc section and the upper leg part form a concave arc: 25mm, 84 °, concave arc of upper end inside angle of lower leg: 29.5mm, 92 °, convex arc of upper leg upper end outer side angle: 6mm, 84 degrees, the upper concave arc of the arc section: 250mm, 152 °, concave arc in the middle of the inside of the upper leg: 400mm, 169 °, arc-shaped segment upper portion and last shank contained angle concave arc: 50mm, 163 °;

the circular arc radius and the tangent included angle of the two ends of the circular arc at each part of the finishing rolling hole K3 are as follows, and the bottom surface of the lower leg is a concave circular arc: 173mm, 163 degrees, the lower part of the arc section and the upper leg included angle concave arc: 20mm, 84.5 °, concave arc of upper end inside corner of lower leg: 23.5mm, 91, go up the protruding circular arc of shank upper end outside angle: 4mm, 78.6 °, arc segment upper concave arc: 300mm, 159 °, concave arc in the middle of the inner side of the upper leg: 600mm, 173 °;

The arc radius of each part of the preformed hole K2 and the included angle of the tangent lines at the two ends of the arc are as follows, and the included angle of the lower part of the arc section and the upper leg part is a concave arc: 18.8mm, 90 °, concave arc of lower leg upper end inside angle: 18.8mm, 90 °, convex arc of upper leg outer side angle: 2.5mm, 85.5 °, arc segment upper portion concave arc: 600mm, 160 °;

the radius of each arc of the hot-rolled finished product hole K1 and the included angles of the tangent lines at the two ends of the arc are as follows, and the included angle between the lower part of the arc section and the upper leg part is a concave arc: 15.2mm, 90 °, lower leg upper end inside angle concave arc: 15mm, 90 °, go up the protruding circular arc of shank upper end outside angle: 2mm, 88.3 °, concave arc at the upper part of the arc segment: 900mm, 170.

7. The method of rolling hat section steel according to claim 6, wherein: the rough rolling pass rolling speed is 1.8-3.2 m/s, the rolling reduction of the flat arc pre-splitting hole K11 is 59mm, and the elongation is 1.200; the rolling reduction of the flat arc pre-splitting hole K10 is 46mm during rolling, and the elongation is 1.191; the rolling reduction of the sectional cutting hole K9 is 36mm, and the elongation is 1.042; the rolling reduction of the sectional cutting hole K8 is 20mm, and the elongation is 1.161; the rolling reduction of the sectional cut hole K7 is 23mm, and the elongation is 1.285; the rolling speed of the medium rolling pass is 2.0-3.5 m/s, the rolling reduction of the finishing rolling hole K6 is 19mm, and the elongation is 1.327; the rolling reduction of the finishing rolling hole K5 is 13mm, and the elongation is 1.263; the rolling reduction of the finishing rolling hole K4 is 9mm, and the elongation is 1.305; the rolling speed of the finish rolling pass is 2.6-4.2 m/s, the rolling reduction of the sectional type finish rolling hole K3 is 5.2mm, and the elongation is 1.296; the rolling reduction of the n-shaped preformed hole K2 is 3.5mm, and the elongation is 1.267; the hot rolled finished hole K1 had a rolling reduction of 3.0mm and an elongation of 1.212.

8. The method of rolling cap steel according to claim 6, wherein: the heating is carried out by adopting a walking beam type heating furnace, the temperature of a soaking section of the heating furnace is controlled to be 1200-1280 ℃, no obvious furnace bottom tube black mark exists on the surface of a steel billet, and the time of the soaking section is ensured to be more than or equal to 22 minutes.

9. The method of rolling hat section steel according to claim 6, wherein: the working water pressure of the descaling machine in the high-pressure water descaling process is more than or equal to 16MPa, so that the scale of the steel billet can be completely removed, and the running speed of the steel billet is 0.5-2.5 m/s.

10. The method of rolling hat section steel according to any one of claims 6 to 9, wherein: the rolling pass also comprises a box-shaped hole K12 before the flat arc pre-splitting hole, and the raw material is processed into a billet suitable for the flat arc pre-splitting hole through the box-shaped hole K12.

11. A hat-shaped steel produced by the rolling method according to any one of claims 1 to 10, characterized in that: including horizontally waist (3), its both ends symmetry respectively are provided with vertical straight leg (2) and horizontally flat leg (1), and straight leg (2) perpendicular to waist (3), and flat leg (1) perpendicular to straight leg (2) just is located one side that straight leg (2) kept away from waist (3).

12. The cap section steel of claim 11, wherein: the fillet radius r2 between the upper end of the flat leg (1) of the hat-shaped steel and the straight leg (2) is 15mm, and the included angle alpha 2 between the upper end of the flat leg (1) and the outer wall of the straight leg (2) is 90 degrees +/-0.5 degrees; the fillet radius r1 between the inner wall of the straight leg (2) and the inner wall of the waist part (3) is 15mm, and the included angle alpha 1 between the inner wall of the straight leg (2) and the inner wall of the waist part (3) is 90 degrees +/-0.5 degrees.

13. The cap section steel of claim 12, wherein: the height h of the hat-shaped steel is 310 +/-2 mm, and the inner width b1 is 350 +/-2 mm; the length b2 of the flat leg (1) is 125 +/-3 mm, the thickness t3 is 18 +/-1 mm, the upper fillet radius r3 of one end of the flat leg (1) far away from the straight leg (2) is 7mm, and the lower fillet radius r4 is 2 mm; the thickness t2 of the straight leg (2) is 12 +/-1 mm, and the thickness t1 of the waist part (3) is 12 +/-1 mm.