High-intensity quake-resistant steel bar for buildings and manufacturing method thereof

Abstract

The invention discloses a high-intensity quake-resistant steel bar for buildings and a manufacturing method thereof. The steel bar for buildings comprises the following components in percentage by weight: 0.14-0.22 percent of C, 0.50-1.50 percent of Si, 1.00-1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, 0.10-1.30 percent of Al and the balance of Fe and inevitable impurities. The manufacturing method of the steel bar for buildings comprises the steps of pre-desulfurizing of molten iron, smelting in a rotating furnace, refining, continuous casting, continuous hot rolling and controlled cooling after rolling. Practices indicate that the high-intensity quake-resistant steel bar produced by adopting the manufacturing method has the characteristics of high intensity, low yield ratio, high-intensity plastic accumulation and superior quake resistance.

Description

technical field [0001] The invention belongs to the technical field of building steel, and specifically refers to a high-strength earthquake-resistant building steel bar and a manufacturing method thereof. Background technique [0002] Due to the frequent occurrence of natural disasters such as earthquakes, people pay great attention to the safety and seismic performance of building structures, and the performance requirements of steel bars for buildings are also getting higher and higher. Before the present invention, the Chinese invention patent with the application number 200710026499.3 disclosed a method for producing niobium-containing HRB400MPa grade steel bar, using Nb microalloy and Nb, V composite microalloying, and its chemical composition (wt%) is C: 0.18~ 0.24, Si: 0.40~0.65, Mn: 1.00~1.50, Nb: 0.03~0.045, S≤0.045, P≤0.045, V: 0~0.035. 1100~1250, soaking temperature 1150~1230, rolling start temperature 1050~1100, the steel bar has high strength, shock resistance...

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Problems solved by technology

[0004] The above existing high-strength steel bars are mainly realized by alloying combined with controlled cooling process. The steel composition is complex, the content of alloy elements is high and the cost is high, and there are problems of low strength, low elongation and high yield ratio of steel products. , In addition, their manufacturing process is complicated, these problems directly affect the construction cost and safety of the building structure

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