Welding high heat input anti-seismic refractory steel plate and manufacturing method thereof

Abstract

The invention discloses a welding high heat input anti-seismic refractory steel plate and a manufacturing method thereof, wherein the steel plate comprises the following chemical components in percentage by weight: 0.01-0.10% of C, 0.08-0.25% of Si, 0.30-0.80% of Mn, 0.05-0.20% of Mo, 0.05-0.12% of Nb, 0-0.6% of Cu and balance of Fe and unavoidable impurities, and the invention further designs a manufacturing method for the welding high heat input anti-seismic refractory steel plate; The welding high heat input anti-seismic refractory steel plate and the manufacturing method thereof provided by the invention can reduce the use cost of the alloy, and has high strength, high toughness, welding heat input amount of more than 120 kJ / cm and fire resistance.

Description

technical field [0001] The invention relates to a welded high heat input anti-seismic refractory steel plate and a manufacturing method thereof, belonging to the field of low-alloy building steel manufacturing. Background technique [0002] Steel structures are light in weight, fast in construction, large in space, comfortable and beautiful, good in earthquake resistance, and recyclable. They are used more and more in high-rise and large public buildings. However, the fire resistance of ordinary steel is very poor. As the temperature rises, Its yield strength drops rapidly, especially at high temperatures above 350°C, and it does not have load-bearing capacity. Therefore, it is necessary to spray a thick refractory coating to protect the steel structure. Spraying a refractory coating will double the cost of steel structure construction. , and prolong the construction period, the splash of spraying operation also causes environmental pollution, reducing the use or not using r...

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Problems solved by technology

"A high-strength fire-resistant steel for steel structure buildings and its preparation method" (application number: 201810558103.8), requires "the first laminar cooling of the hot-rolled steel billet, and the return of the first laminar cooling to red" The temperature is 600-675°C to obtain the steel billet after the first laminar flow cooling", and then "warm-roll the steel billet after the first laminar flow cooling, and cool it to room temperature to obtain high-strength refractory for steel structure buildings. "steel" needs to be "warm rolled" in the ferrite zone at 600-675°C, which greatly increases the load on the rolling mill. Rolling will generate a lot of internal stress, which is not conducive to the control of the shape of the steel plate, nor can it meet the high requirements of the building steel for the shape of the plate

[0006] In addition, in order to ensure the high temperature refractoriness of the currently disclosed refractory steel, a large amount of alloying elements need to be added to ensure the high temperature strength through the solid solution, precipitation or influence of the alloying elements on the transformation of the structure, but the adverse effects caused by this are possible. Reduced solderability

Only the fire-resistant steel disclosed in "High-strength fire-resistant steel with excellent weldability and gas cutting performance and its manufacturing method" (application number: 200680003630.8) can meet the welding heat input of 60kJ / cm, and the fire-resistant steel mentioned in other published patents cannot Meet the welding performance of large input energy greater than 50kJ / cm

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