Fire-resistant and earthquake-resistant steel for construction and production method thereof
A construction steel and refractory technology, applied in the field of construction steel, can solve problems such as complex production process, achieve excellent welding performance, improve purity, and simple operation
Active Publication Date: 2013-03-06
BAOSHAN IRON & STEEL CO LTD +1
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Problems solved by technology
The content of precious metal alloy elements such as Mo and Cr in these steels can be low, but the production process
Method used
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[0043] Specifically, according to the steel composition requirements of the present invention, seven batches of the steel of the present invention were smelted in a vacuum induction furnace, the steel ingot was heated at a temperature of 1180±10° C., the holding time was 3 hours, and the thickness of the finish rolling was three times the final thickness of 60 mm. The rolling temperature is 860-900°C. After final rolling, it is air-cooled to room temperature, or cooled to room temperature at a cooling rate of 5-15°C / s. Example The steel plate was rolled 7 times in total, and the final thickness of the steel plate was 20mm.
[0044] The chemical compositions of the examples of the present invention are shown in Table 1.
[0045] Table 1
[0046]
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The invention relates to a fire-resistant and earthquake-resistant steel for construction. The steel comprises the following components by weight percent: 0.1-0.18 % of C, 0.1-0.50 % of Si, 1-1.80 % of Mn, less than or equal to 0.025 % of P, less than or equal to 0.015 % of S, less than or equal to 0.50 % of Cr, less than or equal to 0.30 % of Mo, less than or equal to 0.04 % of Al, less than or equal to 0.007 % of N, less than or equal to 0.006 % of Ca, one or two or more of less than or equal to 0.050 % of Nb, less than or equal to 0.055 % of V and less than or equal to 0.035 % of Ti, with Nb+V+Ti being <= 0.055 %, and the balance being Fe and unavoidable impurities. A production method comprises heating under a temperature of 1180 DEG C, insulating for 3 hours, rolling with a starting temperature of not less than 1180 DEG C, an accumulated reduction rate of last three controlled rolling being not less than 35 %, and a terminating temperature of 860 to 900 DEG C, and then directly air-cooling to a room temperature or cooling with a rate of 5 to 15 DEG C per second to the room temperature. The obtained steel is excellent in fire resistance, low in yield ratio (Rp0.2/Rm <= 0.75), and good in earthquake-resistance performance, with Rp0.2 (yield strength at 600 DEG C) / Rp0.2 (yield strength at the room temperature) >= 2/3.
Description
technical field [0001] The invention relates to building steel, in particular to an economical fire-resistant and earthquake-resistant building steel and its manufacturing method. Background technique [0002] At present, steel structures are widely used in high-rise buildings and long-span buildings due to their light weight, low foundation cost, short construction period, ability to solve complex problems in large spaces, good integrity and earthquake resistance, and renewable utilization of resources. The application of steel structure has obvious advantages, and it is also the development direction of future buildings. However, the Achilles heel of conventional steel structures is low fire resistance—it is easy to soften and lose basic bearing capacity after a fire occurs in a high-temperature environment, which seriously restricts the development of steel structure buildings. [0003] In the prior art, related patents on fire-resistant and earthquake-resistant building...
Claims
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Inventor 温东辉胡晓萍宋凤明万荣春孙峰张澜庭崔慧然
Owner BAOSHAN IRON & STEEL CO LTD
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