High-performance building structure refractory steel plates and manufacturing method thereof

Abstract

The invention discloses high-performance building structure refractory steel plates and a manufacturing method thereof. The high-performance building structure refractory steel plate comprises the following chemical components in percentage by weight: 0.02 to 0.12 percent of C, 0.05 to 0.50 percent of Si, 0.08 to 1.50 percent of Mn, 0.010 to 0.050 percent of Nb, 0.010 to 0.040 percent of Ti, 0.010 to 0.050 percent of Als, 0.20 to 0.60 percent of Cr, 0.20 to 0.40 percent of Mo, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.0040 percent of N, less than or equal to 0.0020 percent of O and the balance of Fe and inevitable impurities. The production process of the high-performance building structure refractory steel plates is characterized in that: the steel blank heating temperature is 1,100 to 1,250 DEG C; the heating time is 60 to 110s / cm; two-stage controlled rolling is adopted; the final rolling temperature is kept between 800 and 900 DEG C; cooling is started 30 to 120 seconds later after final rolling; the final cooling temperature is kept between 500 and 750 DEG C; the steel plates are stacked quickly, cooled slowly and kept at a constant temperature; the stacking temperature is kept between 650 and 300 DEG C; and the temperature is kept for 10 to 24 hours. The plates have the characteristics of simple chemical components, low cost, and high refractability.

Description

technical field [0001] The invention relates to fire-resistant steel for high-performance building structures, specifically a high-performance 590N / mm 2 Fire-resistant steel plate for grade building structure and its manufacturing method. Background technique [0002] The heat-resistant temperature of refractory steel (FR steel) is required to be above 600°C (general steel is only below 350°C). This kind of steel can basically be used in buildings with less combustibles and large spaces, gymnasiums, museums and other places. Fire-resistant requirements can be achieved without fire-resistant coatings, thus saving a lot of investment. After the "911" incident in the United States, countries all over the world put forward urgent and strict requirements for the fire resistance of buildings, especially high-rise building structures. Therefore, high-performance fire-resistant steel plates for construction have become a hot spot in research and development in recent years. [00...

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Problems solved by technology

[0012] (1) Poor fire resistance is difficult to meet the design requirements of building fire resistance;

[0013] (2) The content of precious elements in the steel plate alloy design is relatively high, which increases the cost of the alloy;

[0014] (3) Most of them need to cooperate with complex rolling process or adopt heat treatment processes such as quenching and tempering, and the production cost is relatively high;

[0015] (4) The production method of controlled cooling after rolling is generally adopted, and the steel plate is easily deformed;

[0016] (5) The yield strength varies in a large range, and some steel types do not control the yield ratio, which is not conducive to the design and manufacture of shock-absorbing structures;

[0017] (6) Low-temperature toughness requirements are basically 0-20 °C, which is difficult to meet the design and construction needs of steel structures in winter in low-temperature areas in the north

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