High-strength light H-shaped steel and hot rolling forming process thereof

Abstract

The invention discloses high-strength light H-shaped steel. The high-strength light H-shaped steel comprises a web plate and a wing plate, wherein the height of the web plate is 146 mm, the thicknessof the web plate is 3.3 mm, the width of the wing plate is 95 mm, and the thickness of the wing plate is 4.0 mm. A hot rolling forming process of the H-shaped steel comprises the following steps: carrying out high-pressure water descaling on a heated square steel billet, carrying out head cutting treatment after cogging rough rolling is carried out by two three-roll horizontal rolling mills, carrying out reciprocating rolling 4-6 times through a universal rough rolling unit, finally carrying out reciprocating rolling 1-2 times by a universal finishing rolling unit, and carrying out fixed-length cutting on a rolled piece after the rolled piece is subjected to air cooling by a cooling machine to obtain a finished product. According to the high-strength light H-shaped steel, under the condition that the rolled H-shaped steel has the same height H and width B as standard H-shaped steel, the thickness of the web plate and the thickness of the wing plate are smaller, and the strength of therolled H-shaped steel can be ensured; and in the rolling process, the pass number of cogging rough rolling is obviously reduced, the rolling time is shortened, the temperature drop of the rolled pieceis small, the product quality is guaranteed, 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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