Quake-proof construction steel with yield strength of 100MPa and production method thereof

Abstract

The invention discloses quake-proof construction steel with the yield strength of 100MPa and a production method thereof. The steel comprises the following chemical components in percentage by weight: less than or equal to 0.002 percent of C, less than or equal to 0.01 percent of Si, less than or equal to 0.10 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 0.020 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 120Mpa, an annealing treatment step is added after the cooling step. Experiments prove that the quake-proof construction steel with the yield strength of 100MPa 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 100 MPa and a production method thereof. Background technique [0002] With the development of steel structure construction, especially the rapid increase of high-rise and super high-rise steel structure buildings, improving the seismic performance of steel structures has become one of the necessary measures to ensure building safety. In the seismic design of steel structure buildings, the energy generated by the earthquake can be absorbed through the plastic deformation of the steel structure, which requires the steel to have better plastic deformation capacity, lower yield strength and good elongation. The domestic and foreign construction circles have begun to consider incorporating the seismic performance of construction steel into building codes. [0003] Before the present invention, there were few patent reports on low-yield-strengt...

AI Technical Summary

Problems solved by technology

However, the performance of the steel is adjusted by adding a large amount of alloying elements, its chemical composition is complex, and the production cost of alloying is high