A kind of hot-rolled h-shaped steel for buckling restraint support and its production process

Abstract

The invention discloses a hot-rolled H-shaped steel for buckling restraint support and its production process. The chemical composition of the H-shaped steel in the invention is calculated by mass percentage, including C: 0.09-0.12%, Si: 0.19-0.22%, and Mn: 0.57-0. 0.60%, P: ≤0.015%, S: ≤0.015%, V: 0.020~0.035%, N: ≤0.0080%, the rest is Fe and unavoidable impurity elements; the production process of the H-shaped steel includes: blast furnace molten iron →Molten iron pretreatment→converter smelting→argon blowing station→LF refining→full protection casting of shaped blanks→H-beam rolling; the invention has narrow yield strength range, large strength-to-yield ratio, good extensibility and low production cost.

Description

technical field [0001] The invention relates to the technical field of steel rolling production, in particular to a hot-rolled H-shaped steel for buckling restraint support and a production process. Background technique [0002] At present, more and more high-rise and super high-rise buildings have widely used energy-dissipating and shock-absorbing technology for key components. Buckling-restrained braces play a dominant role in shock-absorbing products, and they are special structural members that integrate load bearing and energy dissipation. Generally, it is composed of core unit, constraint unit and sliding mechanism unit. The core unit is the main force-bearing element in the component and is made of high elongation steel. GB50011-2010 (2016) "Code for Seismic Design of Buildings" introduced the content of buckling-restrained braces, and the state advocates the use of shock-absorbing products in buildings. For buckling-restrained supports with a yield bearing capacity...

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Problems solved by technology

[0004] For another example, the publication number is CN103834860A, and the invention patent titled "a 235MPa grade low-temperature resistant hot-rolled H-shaped steel and its preparation method" discloses the composition and preparation method, which uses Nb, Ti microalloys and rectangular billets, alloys There are many types and contents, and the elongation rate of its products is poor;

[0005] Another example is the invention patent with the publication number CN104233061B titled "A Low-Temperature Low-Yield Steel and Its Production Method", which discloses a steel plate and its production method, which uses ultra-low carbon and micro-niobium alloy components. The low-temperature impact toughness is guaranteed under the yield condition, but the yield strength is less than 225MPa, and the patent is a hot-rolled plate, and there is a big difference in the production process between the plate and the H-shaped steel, and this method cannot be used for the production of the H-shaped steel;