A kind of high temperature resistant anti-seismic steel bar and its production method

Abstract

The invention discloses high-temperature-resistant aseismic reinforcement. The high-temperature-resistant aseismic reinforcement consists of the following components in percent by weight(wt%): 0.20-0.25% of C, 0.6-1.0% of Si, 0.09-0.11% of Cr, 1.2-1.6% of Mn, not greater than 0.03% of P, not greater than 0.02% of S, 0.05-0.15% of rear earth elements, 0.03-0.05% of V, 0.1-0.3% of Al, 0.2-0.3% of Mo, 0.008-0.012% of N and 0.025-0.05% of Nb. A production method of the high-temperature-resistant aseismic reinforcement comprises the following production steps: carrying out molten iron desulfurization; carrying out converter smelting; blowing argon and feeding into aluminum lines; casting a blank; naturally stacking and cooling to the room temperature; heating the cast blank; carrying out rough rolling; carrying out finish rolling; and naturally cooling in air to the room temperature for later use. On the condition of not modifying the existing equipment, the produced hot-rolled high-temperature-resistant aseismic reinforcement not only can satisfy aseismic performances, but also can satisfy the requirements that the yield strength is reduced by less than 1 / 3 when the reinforcement suffers a high temperature of 600 DEG C for half an hour; and moreover, the production cost is lowered.

Description

technical field [0001] The invention relates to a high-temperature-resistant steel bar and a production method thereof, in particular to a high-temperature-resistant earthquake-resistant steel bar and a production method thereof. Background technique [0002] With the development of domestic residential buildings to high-rise buildings, the floors are getting higher and higher, which makes the fire protection problem of steel bars more prominent. Under the high temperature of fire, the strength and rigidity of steel materials will be significantly reduced, and buildings may collapse and cause huge damage. disaster. Once a house fire occurs, the burning material will cause the surrounding temperature to quickly exceed 300 °C, while the general temperature of concrete is below 300 °C, basically changing little, the compressive strength at 600 °C decays by half, and only 10% of the original value at 800 °C. In 2001, "9· In the 11” incident, the World Trade Center in New York, ...

AI Technical Summary

Problems solved by technology

Its disadvantage is that the production process of the steel bar is complicated, and heat treatment is required to achieve the anti-seismic effect, but its R m实 / R el实 Cannot fully meet the requirements of less than 1.3 in the standard, and the seismic performance does not meet

At the same time, its performance cannot meet the high temperature resistance

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