Anti-seismic and fireproof steel for high-strength building structure and preparation method thereof

Abstract

The invention provides anti-seismic and fireproof steel for a high-strength building structure and a preparation method thereof, and belongs to the field of building steel. The preparation method comprises, 0.04-0.08% of C, 1.0-1.5% of Mn, 0.15-0.60% of Si, 0.2-0.7% of Cr, 0.10-0.60% of Mo, less than or equal to 0.35 of Ti+V+Nb, 0.01-0.05% of Al, 0.1-0.6% of Cu, 0.1-0.6% of Ni, less than or equalto 0.008% of P, less than or equal to 0.002% of S, and the balance iron and inevitable trace chemical elements. Continuous casting is adopted for smelting through a converter or an electric furnace, amedium-thickness plate rolling machine is adopted for rolling, and after rolling is carried out, a steel plate is subjected to heat preservation, quenching and tempering heat treatment processes in an alpha+gamma phase region, and the strength and the yield ratio of a material are controlled by regulating the tissue proportion of bainite, martensite and ferrite; the yield strength is larger thanor equal to 690 MPa, the tensile strength is 850-950 MPa, the elongation at break is larger than or equal to 85%, the percentage elongation after fracture is larger than or equal to 20%, -40 DEG C KV2larger than or equal to 150 J, and the yield strength after heat preservation at 600 DEG C for 3 hours is greater two thirds than the yield strength at room temperature. The preparation method can bewidely applied to high-rise and super-high-rise building steel simultaneously with high-strength, anti-seismic and fireproof requirements and the like.

Description

technical field [0001] The invention belongs to the field of structural steel for construction, in particular to an anti-seismic fire-resistant steel for high-strength building structure and a preparation method thereof. Background technique [0002] At present, domestic and international high-rise steel structure buildings are constantly emerging, not only the number has increased sharply, but also the height has been continuously increased. The board has entered the stage of general application and promotion. It has become a development trend to focus on high-strength, high-performance, large-scale, and functional steel for construction. Considering the safety of buildings and the actual life cycle, higher requirements are put forward for the earthquake resistance and fire resistance of construction steel. [0003] In recent years, earthquakes have occurred frequently, and the seismic performance of steel has attracted much attention. As the ratio of yield strength to ten...

AI Technical Summary

Problems solved by technology

This steel alloy is added with W and Zr, which has high composition and high cost; in order to improve the strength, the Mn content is relatively high, so its welding performance is affected to a certain extent. Under severe temperature, its impact toughness needs to be further verified

Images