Steel for high strength shock-proof hot-rolled steel bar

Abstract

This invention relates to a aseismatic heat rolled steel bar with high strength, which belongs to alloy steel, especially to the heat rolled steel bar, the steel bar is composed by the following elements: 0.07-0.16%C, 1.2-2.0%Si, 1.5-2.0%Mn, <=0.4%Cr, 0.02-0.14%V, the rest is Fe and impurity. The universal steel-making device uses the universal technology; it smelts steel according to the said component range and produces heat rolled steel bar or rod with highe strength and better aseismatic charater. Wherein the yield strengthen sigmas(p0.2)>=550MPa, the yield proportion sigmab / sigmas(p0.2)>=1.45. And the high strength and high yield proportion of the steel bar can enforce the aseismatic charater of the building.

Description

technical field [0001] The invention belongs to alloy steels, in particular to steels for hot-rolled steel bars for reinforced concrete, or steels for other high-strength hot-processed bars. Background technique [0002] The alloy elements and content in steel affect the performance of steel, and the yield strength and strength-to-yield ratio of steel bars directly affect the safety and seismic performance of building structures. Therefore, the use of high-strength hot-rolled steel bars with good seismic performance in building structures has attracted increasing attention. At present, the highest yield strength level of hot-rolled steel bars for construction used at home and abroad is only 500-520MPa, and the highest requirement for the strength-to-yield ratio as an important seismic performance index can only be ≥1.30. For example, the 460MPa grade 460B steel bar in the British BS4449:1997 standard requires a yield strength of ≥460MPa, and the strength-to-yield ratio is ≥...

AI Technical Summary

Problems solved by technology

Since the yield strength and strength-to-yield ratio of steel bars in the above countries are relatively low, in order to ensure the safety and seismic performance of the building structure, it is necessary to increase the density of the bars or increase the specifications of the steel bars, which increases the amount of steel and increases the construction cost.