550MPa-yield-strength fire-resistant weather-resistant earthquake-proof construction steel and production method thereof

A yield strength, fire and weather resistance technology, which is applied in the field of fire-resistant, weather-resistant and seismic-resistant construction steel with a yield strength of 550 MPa and its production field, can solve the problem of low strength levels of steel grades, and achieve the effect of improving the safety of use and reducing maintenance costs.

Active Publication Date: 2014-04-02
武汉钢铁有限公司
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Problems solved by technology

[0005] Common deficiencies in the above patent documents: the steel grades are relatively low

Method used

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  • 550MPa-yield-strength fire-resistant weather-resistant earthquake-proof construction steel and production method thereof
  • 550MPa-yield-strength fire-resistant weather-resistant earthquake-proof construction steel and production method thereof
  • 550MPa-yield-strength fire-resistant weather-resistant earthquake-proof construction steel and production method thereof

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Embodiment Construction

[0032] The present invention is described in detail below:

[0033] Table 1 is the value list of each embodiment of the present invention and comparative example;

[0034] Table 2 is the main process parameter list of each embodiment of the present invention and comparative example;

[0035] Table 3 is a list of the performance tests of the various embodiments of the present invention and comparative examples.

[0036] Each embodiment of the present invention is produced according to the following steps:

[0037] 1) Carry out desulfurization of molten iron, and control S in molten iron to ≤0.001%;

[0038] 2) Carry out converter smelting, and control C in molten steel: 0.041~0.125%, P≤0.008%;

[0039] 3) Carry out vacuum treatment in the RH furnace, add Mg element to make Mg: 0.0071~0.0098%, and control O≤0.0012%;

[0040] 4) Conventional continuous casting and heating of the slab, the heating temperature is controlled at 1200-1320°C;

[0041] 5) Carry out segmental rolli...

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Abstract

The invention relates to a 550MPa-yield-strength fire-resistant weather-resistant earthquake-proof construction steel which comprises the following components in percentage by weight: 0.041-0.125% of C, 0.31-0.62% of Si, 1.81-2.40% of Mn, at most 0.008% of P, at most 0.002% of S, 0.041-0.065% of Nb, 0.007-0.020% of Ti, 0.41-0.63% of Mo, 0.07-0.10% of W, 0.0071-0.0098% of Mg and at most 0.0012% of O. The production method comprises the following steps: desulfurizing molten iron; smelting in a converter; carrying out vacuum treatment, and adding the Mg element; carrying out conventional continuous casting, and heating the casting blank; carrying out sectional rolling; and carrying out finish rolling, and cooling for later use. The steel has the following advantages: the chemical components and technique are simple, the yield strength of the steel plate is 550-700MPa, the earthquake-proof property is good (the yield-tensile ratio is at most 0.83), the fire resistance is favorable (the yield strength at 600 DEG C is not lower than 2/3 of that at room temperature), and the corrosion resistance is better than CortenB. Besides, the steel grade has excellent impact toughness and weldability.

Description

technical field [0001] The invention relates to a steel for construction and a production method thereof, in particular to fire-resistant, weather-resistant and earthquake-resistant construction steel with a yield strength of 550 MPa and a production method thereof. Background technique [0002] With the rapid development of high-rise steel structure buildings, new requirements have been put forward for steel plates used to make structural parts such as columns and beams in terms of strength, fire resistance, weather resistance, and earthquake resistance. This is because: the use of high-strength steel can Improve the strength grade of structural steel to avoid quality problems in the subsequent processing and welding process due to excessive steel thickness. At the same time, it can also reduce structural weight, reduce construction costs, reduce steel waste, and improve structural reliability; The damage to the structure caused by factors such as fire and earthquake can pr...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B37/74
Inventor 张开广童明伟梅荣利范巍黄海娥刘文斌
Owner 武汉钢铁有限公司
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