Flange variable thickness hot-rolled H-shaped steel and production method thereof

Abstract

The invention discloses flange variable thickness hot-rolled H-shaped steel and a production method thereof. The H-shaped steel comprises an upper flange, a lower flange and a web plate, wherein the web plate is vertically positioned between the upper flange and the lower flange, and the upper flange and the lower flange are different in thickness. The production method includes a BD area rolling process and a universal area rolling process, and the difference between rolling reduction in the thickness direction of the upper flange and the lower flange in a BD area in groove design is smaller than 8mm. The manufacturing process is simple, welding workload is decreased, the steel is saved, and traditional welded H-shaped steel can be replaced. The sectional mechanical property of the H-shaped steel is optimized by changing the thicknesses of the flanges on two sides, anti-bending section modulus can be increased by 4-15% as compared with that of H-shaped steel with the same thickness of an upper flange and a lower flange, and the rigidity and the loading capacity of an automobile girder are improved.

Description

technical field [0001] The invention relates to a hot-rolled H-shaped steel with unequal thickness of the flange and a production method thereof. The hot-rolled H-shaped steel is mainly suitable for automobile girders. Background technique [0002] H-shaped steel is an economical cross-section steel, which is widely used in industry, construction, bridges, oil drilling platforms, etc. It is predicted that the demand for H-shaped steel in my country will be about 2.5 million tons in 2005 and 5 million tons in 2010. The annual production capacity of H-shaped steel is 1.2 million tons, and the market demand is huge. [0003] At present, the general heavy-duty vehicle girder adopts welded H-shaped steel girders or directly uses hot-rolled H-shaped steels with equal flanges. The processing technology of welding H-beam is complex, time-consuming and wasteful, and there are unavoidable weld defects; the hot-rolled H-beam with equal flanges has equal thickness on the upper and lower...

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Problems solved by technology

The processing technology of welding H-beam is complicated, time-consuming and wasteful, and there are unavoidable weld defects; the hot-rolled H-beam with equal flanges has equal thickness on the upper and lower flanges, which is not suitable for the characteristics of the automobile girder. Because the upper and lower flanges have equal thickness, the bending section The modulus is relatively small, which affects the stiffness and load capacity of the car frame

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