Large-section aluminum-containing hot-rolled H-shaped steel and manufacturing method thereof

Abstract

The invention discloses large-section aluminum-containing hot-rolled H-shaped steel and a manufacturing method thereof. Chemical components of the hot-rolled H-shaped steel comprise, by weight percent, 0.11-0.14% of C, 0.18-0.25% of Si, 1.40-1.50% of Mn, smaller than or equal to 0.025% of P, smaller than or equal to 0.008% of S, 0.040-0.050% of V, 0.012-0.02% of Ti, 0.040-0.050% of Al and the balance iron and trace impurity. The manufacturing method of the steel comprises the steps of molten iron pre-desulfuration, converter smelting, LF refining, near-net-shape beam bank continuous casting and rolling. According to the steel and the method, by means of vanadium-titanium composite microalloying, meanwhile, an aluminum element is used in cooperation, the refined crystalline strengthening and dispersion strengthening effect is achieved, and the comprehensive mechanical performance of the large-section H-shaped steel is improved. In the production process, the beam blank single-point flange non-equilibrium full-protection continuous casting technology is adopted, the cleanness degree of the molten steel is controlled strictly, scaffolding of a water opening is reduced, the inclusion content is low, the low-temperature impact performance of rolled materials is stable, and the yield is high.

Description

technical field

[0001] The invention relates to metallurgical technology, in particular, the invention relates to a large-section aluminum-containing hot-rolled H-shaped steel and a preparation method thereof. Background technique

[0002] The section shape of H-shaped steel is economical and reasonable, with good mechanical properties. It has the advantages of large section modulus, light weight, and metal saving. It can reduce the steel 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 and combined. It can save up to 25% of welding and riveting workload, so it is an important steel for steel structure. With the high-rise and large-span steel structures, the demand for large-section low-alloy high-strength H-beams is increasing. Due to the continuous expansion of steel structure application fields, special steel structure application fields such as high-altitude regions, high-latitude regio...

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