Q235KZ anti-knock hot rolling H-shaped steel for steel structure and preparing method of Q235KZ anti-knock hot rolling H-shaped steel

Abstract

The invention discloses a preparing method of Q235KZ anti-knock hot rolling H-shaped steel for a steel structure. The preparing method includes the steps that in the converter smelting process, w[S] in molten iron put into a converter is controlled to be smaller than or equal to 0.010%; in the LF refining process, the LF furnace refining time is prolonged; in the VD vacuum refining process, the VD furnace argon blowing time is not shorter than 15 min; in the continuous casting process, the pulling rate scope of a continuous casting machine is 0.85 m / min to 0.9 m / min, and the steel ball superheat degree is lower than 25 DEG C; in the rolling process, the billet heating temperature ranges from 1210 DEG C to 1250 DEG C; and the initial rolling temperature is lower than or equal to 1200 DEG C, and the final rolling temperature is 870 DEG C to 890 DEG C. The invention further discloses the Q235KZ anti-knock hot rolling H-shaped steel for the steel structure. The H-shaped steel obtained through the method has the very good ductility, good welding performance and low-temperature impact resisting performance.

Description

technical field [0001] The invention relates to a metallurgical material technology, in particular to a Q235KZ shock-resistant hot-rolled H-shaped steel for steel structures and a preparation method thereof. Background technique [0002] Architecture is a symbol of human civilization, and its development marks the development of human civilization. The 21st century is a century of steel structures for building structures, and the development of building steel structures is also the embodiment of architectural civilization in the 21st century. [0003] Under the action of earthquakes, the steel used in construction has the problem of high strain and low cycle fatigue, and the requirements for the flexibility of steel are different for buildings in earthquake areas and non-earthquake areas. Domestic scholars have put forward the following five indicators after a large number of experiments and investigations. As the seismic performance indicators of steel, they are relatively...

AI Technical Summary

Problems solved by technology

In recent years, the application of steel structures in modern buildings has become more and more common, especially high-rise buildings, which are almost inseparable from steel structures. Of course, my country's research on earthquake resistance has made great progress in all aspects, and there are many research results It has been included in the design code, but due progress has not been made in the aspect of steel used in seismic design. The material selection criterion is still based on the static strength of steel, ignoring the service conditions and failure modes of steel under strong alternating seismic loads. Factors that are quite different from those under static load, which is obviously unscientific and unreasonable

Images