High-yield-strength 600MPa-level ultra-thick hot-rolled H-shaped steel and production method thereof

Abstract

The invention discloses high-yield-strength 600MPa-level ultra-thick hot-rolled H-shaped steel and a production method thereof, and belongs to the technical field of production of rolled steel. The hot-rolled H-shaped steel disclosed by the invention comprises the following elements in percentage by mass: 0.14 percent to 0.18 percent of C, 0.35 percent to 0.55 percent of Si, 1.10 percent to 1.40 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, 0.080 percent to 0.12 percent of V, 0.020 percent to 0.040 percent of Nb, less than or equal to 0.025 percent of N, and the balance of Fe and inevitable impurities. The production process of the ultra-thick hot-rolled H-shaped steel comprises a step of pre-treatment of molten iron, a step of converter smelting, a step of argon blowing and refining, a step of LF refining, a step of full-protection and casting of shaped blank, a step of heating of blanks, a step of rolling the blanks, and performing QST (Quantitative Sensory Testing) cooling after rolling. According to the method disclosed by the invention, through reasonable proportioning of the ingredients and rolling process, particularly distribution of controlled reduction quantity and controlled-temperature rolling, the hot-rolled H-shaped steel with excellent comprehensive mechanical performance, the thickness 70mm to 100mm of flanges, the yield strength being more than or equal to 600MPa, the tensile strength being more than or equal to 750MPa, the elongation rate being more than or equal to 15 percent, 0-DEG C longitudinal V-shaped impact power KV2 mean value being more than or equal to 60J and Z-directional performance being more than or equal to 20 percent for high-rise buildings can be obtained.

Description

technical field [0001] The invention belongs to the technical field of steel rolling production, and more specifically relates to an ultra-thick hot-rolled H-shaped steel with a yield strength of 600 MPa and a production method thereof. Background technique [0002] In recent years, the number of super high-rise buildings in my country has increased, and the emergence of such buildings has played a greater role in reducing the area occupied by buildings in my country. Especially for countries with a large population like my country, the development of super high-rise Building is undoubtedly an important measure to solve the problem of the increase of building area and the decrease of per capita land in our country. In my country, super high-rise buildings are mainly used as office buildings, hotels or large-span commercial real estate. The projected building area of ​​this kind of high-rise steel structure in the design and application of standard floors is usually small, wh...

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Problems solved by technology

[0009] The purpose of the present invention is to overcome the complex deformation of the existing hot-rolled H-shaped steel during the rolling process, the difficulty in controlling its performance stability, and the difficulty in obtaining a hot-rolled H-shaped steel with relatively thick flange thickness and excellent mechanical properties. Insufficiency of the invention provides a kind of ultra-thick hot-rolled H-shaped steel with a yield strength of 600MPa and its production method

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