A kind of high-strength light-weight h-shaped steel and its hot rolling forming process

Abstract

The invention discloses a high-strength light-weight H-shaped steel, which comprises a web and a wing, the height of the web is 146 mm, the thickness of the web is 3.3 mm, the width of the wing is 95 mm, and the thickness of the wing is 4.0 mm; the H-shaped steel is hot-rolled and formed The process is as follows: the heated square steel billet is descaled by high-pressure water, rough-rolled by two three-roller transverse rolling mills, and then subjected to head-cutting treatment, and then rolled back and forth for 4-6 passes by a universal rough-rolling unit, and finally passed through The universal finishing rolling unit reciprocates rolling for 1-2 passes, and the rolled piece is air-cooled by the cooling bed and then cut to a fixed length to obtain the finished product; the invention can make the rolled H-shaped steel have the same height H and width B as the standard H-shaped steel Under normal circumstances, it has a smaller web thickness and wing thickness, and can guarantee its strength; in the rolling process, the number of rough rolling passes is significantly reduced, the rolling time is shortened, and the temperature drop of the rolled piece is small. The product quality is guaranteed, while the rolling production speed is accelerated, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a high-strength light-weight H-shaped steel and its hot-rolled forming process, belonging to the technical field of shaped steel production. Background technique [0002] H-shaped steel is an economical cross-section high-efficiency profile with more optimized cross-sectional area distribution and a more reasonable strength-to-weight ratio. It is named because its cross-section is the same as the English letter "H". [0003] As a new type of steel for construction, H-shaped steel has an economical and reasonable section shape, good mechanical properties, uniform extension of each point on the section during rolling, and small internal stress. Compared with ordinary I-shaped steel, it has a large section modulus and low weight. The advantages of being light and saving metal can reduce the building structure by 30-40%. Because the inside and outside of the legs are parallel, and the legs are at right angles, they can be assembled...

AI Technical Summary

Problems solved by technology

[0004] At present, there are no H146*95*3.3*4.0 (W6*6.2) ultra-thin H-shaped steel products at home and abroad. This H-shaped steel is generally rolled or welded during production. The existing rolled H-shaped steel is generally The standard size, the thickness of the web and the flange is also a standard value, which is relatively thick, which causes waste of materials in some steel structures, and when the existing H-shaped steel is rolled, there are many blanking passes. On the one hand, The long rolling time will cause a large temperature drop of the rolled piece, resulting in a decline in product quality. On the other hand, the rolling production speed will be reduced and the production efficiency will be low.

[0005] In summary, there are obviously inconveniences and defects in the actual use of the existing technology, so it is necessary to improve

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