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A hat-shaped steel rolling method and hat-shaped steel

A section steel and finishing rolling technology, which is applied to the hat section steel rolling method and the hat section steel field, can solve problems such as the inability to produce hat section steel, etc., and achieve the effects of reducing the difficulty of process design, reducing stable rolling, and reducing wear and tear.

Active Publication Date: 2022-07-29
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a hat-shaped steel rolling method and hat-shaped steel to solve the problem that the prior art cannot meet the needs of steel mills to produce hat-shaped steel through billets

Method used

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  • A hat-shaped steel rolling method and hat-shaped steel
  • A hat-shaped steel rolling method and hat-shaped steel
  • A hat-shaped steel rolling method and hat-shaped steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A hat-shaped steel rolling method, the rolling process comprises: heating → high-pressure water descaling → billet rough rolling → reciprocating continuous rolling → cooling → straightening;

[0041] A walking beam heating furnace can be used for heating, and the temperature of the soaking section of the heating furnace is preferably controlled at 1200-1280 °C to ensure that there is no obvious black mark on the bottom tube on the surface of the billet, and to ensure that the soaking section time is ≥ 30 minutes. In this example The preferred ≥ 33 minutes;

[0042] The working water pressure of the descaling machine in the high-pressure water descaling should not be lower than 16MPa, to ensure that the iron oxide scale of the billet is removed cleanly, and the running speed of the billet can be controlled at 0.5-2.5m / s, preferably 1.5-2m / s in this example;

[0043] During rolling, the rolling holes shall include at least wavy flat arc pre-cut holes (such as figure 2 s...

Embodiment 2

[0049] The difference between this embodiment and Embodiment 1 is that the rolling pass includes a flat arc pre-slit hole K10, a few types of slit holes K7, several types of finishing holes K5, and several types of finishing holes in the order of passes. K3 and the hot-rolled finished hole K1, other pass types can be added between each pass, and the total number of passes does not need to be controlled at 11 or 12, and the producer can adjust it as needed; but in principle, it still needs to be satisfied, from The angle between the upper leg and the middle arc section and the slope of the side wall of the upper leg gradually decrease according to the sequence of passes from the several cut holes to the hot-rolled finished hole.

Embodiment 3

[0051] The difference between this embodiment and Embodiment 1 is that the temperature of the soaking section of the heating furnace is controlled at 1220-1280°C, and the working water pressure of the descaling machine in the high-pressure water descaling is ≥20.5MPa;

[0052] On the basis of Example 1, the arc radii of the flat arc-shaped pre-cutting hole K11 and the angle between the tangents at both ends of the arc are as follows: β1-11: 40mm, 93.9°, β2-11: 40mm, 125.9°, β3 -11: 60mm, 96.7°, β4-11: 100mm, 150.8°, β5-11: 45mm, 118.3°, β6-11: 60mm, 153.3°, β7-11: 50mm, 130.3°, β8-11: 40mm, 128.7°, β9-11: 25mm, 77°;

[0053] The arc radius of the flat arc pre-cut hole K10 and the tangent angles at both ends of the arc are as follows: β1-10: 40mm, 112.9°, β2-10: 50mm, 108.8°, β3-10: 60mm, 89.2°, β4-10: 180mm, 160°, β6-10: 50mm, 123.1°, β7-10: 40mm, 123.1°, β8-10: 80mm, 133.6°, β9-10: 28mm, 87°;

[0054] The radii of the arcs and the angles of the tangents at both ends of the ...

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Abstract

The invention discloses a hat-shaped steel rolling method and a hat-shaped steel; the rolling process of the invention comprises: heating → high-pressure water descaling → billet rough rolling → reciprocating continuous rolling → cooling → straightening; rolling pass Including wavy flat arc pre-slit holes, M-shaped cut holes, finish-rolled holes and hot-rolled finished holes, the middle of finish-rolled holes and hot-rolled finished holes have arc segments, Both ends of the shape segment are symmetrically provided with an upper leg and a lower leg, the upper end of the upper leg intersects with one end of the arc segment to form an included angle, and the lower leg is arranged at the lower end of the side away from the arc segment of the upper leg and is connected to the upper leg. The hat-shaped steel includes a horizontal waist, and two ends of the hat-shaped steel are symmetrically provided with a vertical straight leg and a horizontal flat leg respectively, and the flat leg is located on the side of the straight leg away from the waist; the invention can effectively improve the hat-shaped steel. Production efficiency, improve rolling stability, reduce the difficulty of process design, and reduce the loss of roll equipment.

Description

technical field [0001] The invention relates to the field of hot-rolled section steel forming, in particular to a hat-shaped steel rolling method and a hat-shaped steel. Background technique [0002] At present, the middle beam of the underframe of the convertible car, convertible car and passenger car in the railway freight car is made of two B-shaped steel welded into a hat shape and placed in the middle of the underframe as the bearing middle beam. It is easy to corrode and needs to be straightened after welding. In order to ensure the strength, the thickness needs to be increased, and the cost will increase accordingly. With the development of my country's economy and the further speed-up of trains, higher requirements for railway steel have also been put forward. If the direct hot-rolled hat-section steel forming process is adopted, the defects caused by welding will be avoided, and the cost, man-hour and weight can also be reduced, so the production process has huge e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/08B21B37/16B21B37/46B21B37/00B21B37/74
CPCB21B1/08B21B37/16B21B37/46B21B37/00B21B37/74B21B2201/06B21B2261/10B21B2265/22B21B2275/04
Inventor 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
Owner MAANSHAN IRON & STEEL CO LTD
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