Low-temperature low-yield steel and manufacturing method thereof

Abstract

The invention relates to a low-temperature low-yield steel and a manufacturing method thereof, wherein the steel is prepared by the following chemical components according to the weight percentage: 0.01-0.04% C, 0.14-0.3% Si, 0.3-0.5% Mn, no more than 0.013% P, no more than 0.005% S, and 0.01-0.035% Nb, and the steel is designed by adopting ultra-low carbon and micro niobium alloy to ensure its low-temperature impact toughness under a low-yield condition. The manufacturing method of the hot-rolling low-temperature low-yield steel is characterized by adopting ultra-low carbon and niobium alloy, and combining a reasonable controlled rolling and cooling process to manufacture the low-temperature low-yield anti-seismic steel, wherein the hot rolling mechanical property can reach requirements, the yield strength is less than 225MPa, the elongation reaches 40%, and the impact energy is no less than 250 J at -40 degrees centigrade. The method can successfully solve the technical difficulty that the low-temperature low-yield steel is easy to mix crystals, narrow in rolling temperature windows and low roll force.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a low-temperature low-yield anti-seismic steel and a production process. Background technique [0002] Earthquakes have brought huge disasters to human beings. With the development of building anti-seismic technology and the in-depth analysis of anti-seismic mechanism, energy consumption anti-seismic technology has become a development trend of anti-seismic technology. Energy-consuming anti-seismic technology absorbs earthquake energy through energy dissipation dampers. During an earthquake, these anti-seismic devices bear the seismic load before other structural parts, and yield first, and absorb the seismic energy by repeated loads to protect the safety of the main structure and buildings. Since the 1990s, the research and development of low-yield-point steel as the main component in energy-dissipative aseismic design has attracted widespread attention. [0003] The patent...

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Problems solved by technology

Therefore, combining compositional design and process control to produce economical hot-rolled low-yield steel provides a basis for the application and promotion of seismic materials. However, this method is prone to mixed crystals, narrow rolling temperature window, and low-yield steel. Issues such as low restraint

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