High-strength anti-seismic steel bar and rolling process thereof

Abstract

The invention discloses a high-strength anti-seismic steel bar. The steel bar comprises, by weight, 0.24-0.28% of C, 0.50-0.80% of Si, 1.40-1.60% of Mn, less than or equal to 0.040% of S, less than orequal to 0.040% of P, 0.120-0.160% of V, 0.010-0.030% of Nb, 0.0140-0.0220% of N, and the balance being Fe and inevitable impurities. The rolling process comprises the following steps: (1) preparingmaterials according to the components by weight; (2) preparing a steel billet of suitable size; (3) rolling, wherein heating temperature of the steel billet is 1000-1200 DEG C, soaking temperature is1150-1230 DEG C, and rolling temperature is 1100-1200 DEG C; and (4) treating on a cold bed for natural cooling after heating and rolling, and then carrying bundling and stacking. A steel bar alloy system is simple and is easy for blank smelting and continuous casting efficient production; precious alloys such as nickel and molybdenum are not adopted, the content of niobium and vanadium is low, and the product alloy cost is low; and the developed high-strength steel bar has excellent comprehensive performance and safety performance, the durability and the safety of key engineering buildings can be ensured, and the application and popularization prospects are good.

Description

technical field [0001] The invention relates to the technical field of high-strength steel bars, in particular to a hot-rolled high-strength anti-seismic steel bar of 630 MPa level and above and a rolling process thereof. Background technique [0002] Hot-rolled high-strength steel bars can be used in high-rise, long-span building structures, and civil air defense projects due to their high strength, excellent comprehensive properties (process performance, welding performance, ductility, seismic performance, etc.), energy saving and environmental protection, long service life, and high safety. and other key projects. In recent years, the country has been vigorously advocating energy conservation, emission reduction, and green environmental protection. As a construction industry that occupies an important position in the national economy, the promotion and application of high-strength steel bars not only conforms to the development trend of modern green and energy conservatio...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many domestic production methods for 630MPa and above high-strength steel bars, but there are certain differences in composition control and product anti-seismic performance. Requirements, but the seismic performance, welding performance, and elongation will be affected; at the same time, the production process of high-strength steel bars is more complicated than that of ordinary steel bars, such as adding complex processes such as refining process, billet stack cooling, controlled rolling and controlled cooling, or online heat treatment, which greatly limits high-strength steel. The large-scale promotion and application of steel bars will have a certain impact on the safety and stability of buildings