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Hat shape steel rolling method and hat shape 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 the problems of incapable of meeting the production of hat section steel, etc., so as to improve the production efficiency and rolling stability, reduce the loss, and reduce the difficulty of process design. Effect

Active Publication Date: 2021-03-12
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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  • Hat shape steel rolling method and hat shape steel
  • Hat shape steel rolling method and hat shape steel
  • Hat shape steel rolling method and hat shape steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0041] 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 of the furnace bottom tube on the surface of the billet, and ensure that the soaking section time is ≥ 30 minutes. This example Among the preferred ≥ 33 minutes;

[0042] In high pressure water descaling, the working water pressure of the descaling machine should not be lower than 16MPa to ensure that the 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 at least include wavy flat arc-shaped pre-slit holes in the order of pa...

Embodiment 2

[0049] The difference between this embodiment and Embodiment 1 is that the rolling passes include flat arc-shaped pre-slitting holes K10, several types of cutting holes K7, several types of finishing holes K5, and several types of finishing holes in the order of passes. K3 and hot-rolled finished hole K1, other passes 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 of the several-type cutting hole to the hot-rolled finished hole and the slope of the side wall of the upper leg gradually decrease in the order of passes.

Embodiment 3

[0051] The difference between this example and Example 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 radius of the flat arc-shaped pre-slit hole K11 and the angle between the tangent lines 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-shaped pre-cut hole K10 and the angle between the tangent lines 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 circular arcs and the tangent angle...

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Abstract

The invention discloses a hat shape steel rolling method and hat shape steel. The technological process of rolling comprises the steps of heating, high-pressure water descaling, cogging rough rolling,reciprocating type continuous rolling, cooling and straightening. A rolling hole pattern comprises a wavy flat arc-shaped pre-segmentation hole, an M-shaped n-type segmentation hole, an n-type finishrolling hole and a hot rolling finished product hole, arc-shaped sections are arranged in the middles of the n-type finish rolling hole and the hot rolling finished product hole, upper leg parts andlower leg parts are symmetrically arranged at the two ends of each arc-shaped section, and the upper ends of the upper leg parts and one ends of the arc-shaped sections intersect to form included angles; the lower leg parts are arranged at the lower ends of the sides, away from the arc-shaped sections, of the upper leg parts and intersect with the upper leg parts to form included angles; and the hat shape steel comprises a horizontal waist, vertical straight legs and horizontal flat legs are symmetrically arranged at the two ends of the waist respectively, and the flat legs are located at thesides, away from the waist, of the straight legs. According to the method, the production efficiency of the hat shape steel can be effectively improved, the rolling stability is improved, the processdesign difficulty is reduced, and the roller equipment loss is reduced.

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 the hat-shaped steel. Background technique [0002] At present, the center beams of the chassis of convertible cars, caravans and passenger cars in railway freight cars are all made of two B-shaped steels that are welded into a hat shape and placed in the middle of the chassis as the load-bearing center beam. The welding process increases, and the weld seam 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 are placed on railway steel. If the forming process of direct hot-rolled hat-shaped steel is adopted, the defects caused by welding will be avoided, the cost can be reduced, labor hours can be saved, ...

Claims

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Application Information

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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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