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

A technology of H-shaped steel and steel structure, applied in the field of metallurgical materials, can solve unreasonable and unscientific problems, achieve good welding performance and low temperature impact resistance, and reduce the effect of C content

Inactive Publication Date: 2017-09-05
INNER MONGOLIA BAOTOU STEEL UNION
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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, b...

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

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Embodiment Construction

[0020] The technical solutions of the present invention will be described in detail below with reference to exemplary implementations. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.

[0021] The preparation method of Q235KZ shock-resistant hot-rolled H-shaped steel for steel structure includes: molten iron pretreatment→converter smelting→LF refining→VD vacuum refining→continuous casting→rolling.

[0022] During the smelting process of the converter, control the w[S]≤0.010% of molten iron in the converter, increase the tapping temperature of the converter to about 1630°C, and control the slag amount of the converter.

[0023] During the LF refining process, extend the refining time of the LF furnace. LF heating ...

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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...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C21D8/00
CPCC22C38/02C21D8/005C22C38/04C22C38/12
Inventor 宋振东
Owner INNER MONGOLIA BAOTOU STEEL UNION
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