Hot-rolled H-shaped steel, and application and production method thereof

Abstract

The invention relates to a hot-rolled H-shaped steel, and application and a production method thereof. The hot-rolled H-shaped steel contains the following components in percentage by weight: 0.08-0.18% of C, 0.20-0.45% of Si, 1.00-1.65% of Mn, 0.005-0.035% of P, at most 0.025% of S, at most 0.10% of V, less than 0.070% of Nb, less than 0.025% of Ti, and the balance of iron and inevitable impurities. The hot-rolled H-shaped steel can be used for semitrailer girders. According to the production method of the hot-rolled H-shaped steel for semitrailer girders comprises, a selective cooling process is adopted after the hot rolling of the H-shaped steel, thereby uniformly cooling the H-shaped steel with higher temperature to a proper temperature within a short time; and the cooling process lowers the waves at the wing edge and web plate due to the nonuniform temperature of the rolled piece. According to the production method, the hot-rolled H-shaped steel with the specification of 491*146*7*11.5 and the yield strength of 345-500 MPa, which is produced under the reasonable control on the production technique, substitutes the welded H-shaped steel and enhances the all-day fatigue property and safety of the semitrailer.

Description

technical field [0001] The invention belongs to the technical field of metal material production, and in particular relates to a hot-rolled H-shaped steel for the beam of a semi-trailer, its application and its production method. Background technique [0002] Freight vehicles, as the main equipment of road transportation, are developing in the direction of heavy load, light weight and specialization. At the same time, the material for making the semi-trailer beam also uses hot-rolled H-shaped steel instead of welded H-shaped steel beams. The welded H-shaped steel is welded by hot-rolled flange plates and open flat plates. The following problems exist in the use of welded H-shaped steel: ① Due to the welding defects of the welded H-beam itself, the overall fatigue performance of the girder is poor; ② there is a big difference in the performance of the flange and the web. The rolling process is quite different; ③The waste of metal in the welding process increases the consumpt...

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Problems solved by technology

At the same time, the material for making the semi-trailer beam also uses hot-rolled H-shaped steel instead of welded H-shaped steel beams. The welded H-shaped steel is welded by hot-rolled flange plates and open flat plates. The following problems exist in the use of welded H-shaped steel: ① Due to the welding defects of the welded H-beam itself, the overall fatigue performance of the girder is poor; ② there is a big difference in the performance of the flange and the web. The rolling process is quite different; ③The waste of metal in the welding process increases the consumption of welding materials and energy, requires investment in production sites and welding equipment, and increases labor, resulting in increased costs

However, the patent mainly involves steel plates for automobile girders, and does not involve hot-rolled H-beams for semi-trailer girders.