Quake-proof construction steel with yield strength of 160MPa and production method thereof

Abstract

The invention discloses quake-proof construction steel with the yield strength of 160MPa and a production method thereof. The steel comprises the following chemical components in percentage by weight: 0.002 to 0.005 percent of C, less than or equal to 0.03 percent of Si, 0.10 to 0.50 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.002 to 0.007 percent of Mg, 0.020 to 0.070 percent of Ti, 0.010 to 0.030 percent of Nb, 0.001 to 0.003 percent of N, less than or equal to 0.050 percent of Al, and the balance of Fe and inevitable impurities. The production method thereof comprises the steps of desulfuration of molten iron, converter blowing, vacuum treatment, continuous casting, hot rolling, cooling and the like. When the yield strength of steel products exceeds 180Mpa, an annealing treatment step is added after the cooling step. Experiments prove that the quake-proof construction steel with the yield strength of 160MPa has the characteristics of low yield strength, high elongation and excellent impact toughness; and the production method of the steel has the advantages of simple process flow and low production cost.

Description

technical field [0001] The invention relates to building steel, in particular to an anti-seismic building steel with a yield strength of 160 MPa and a production method thereof. Background technique [0002] With the development of steel structure construction, improving the seismic performance of steel structure has become one of the necessary measures to ensure the safety of buildings. In the seismic design of steel structure buildings, the energy generated by the earthquake can be absorbed by the plastic deformation of the steel structure, which requires that the steel used in the building has a lower yield strength, better plastic deformation capacity and good elongation. [0003] Before the present invention, the patent (JP20060113479) "LOW YIELD POINT STEEL FOR DAMPER ANDITS PRODUCTION METHOD" applied by Japan's NIPPON STEEL CORP disclosed a low yield point steel for making anti-seismic energy dissipation dampers with a yield strength of 150-250 MPa. The weight percen...

AI Technical Summary

Problems solved by technology

The composition and process of this invention are mainly implemented for cold-rolled thin steel plates, so they cannot meet the needs of large-scale building structures, and the Mg element is only added for the purpose of denaturation of inclusions, and the impurity content of the steel plate is relatively high. are not high