High strength steel plate for big thickness tall building structure and production method thereof
A high-strength steel plate, high-rise building technology, applied in rolling mill control device, heat treatment process control, metal rolling and other directions, can solve the problems of inability to meet the requirements of high-rise buildings, unable to ensure the normal progress of the project, long purchase cycle, etc. Welding performance and lamellar tear resistance, increased atmospheric corrosion resistance, simple production process effect
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Embodiment 1
[0020] The actual composition (by weight percentage) of the low-C high-strength steel of the present invention is: C 0.14%, Si 0.28%, Mn 1.52%, P 0.012%, S 0.003%, Al 0.053%, Nb 0.043%, V 0.076%, Ni 0.27%, Ti 0.02%, Ceq 0.43%, rolled into 110mm steel plate. Its mechanical properties: yield strength 420MPa, tensile strength: 595MPa, yield strength ratio = 0.72, δ5 = 27%, impact energy AKV (longitudinal) 143, 136, 92J at -40°C, Z direction: 40, 40, 46%.
[0021] GB6803-86 was used for the non-plastic transition temperature drop weight test. The NDT temperature was -65°C. The weldability test of the steel plate was conducted by the Construction Research Institute of China Metallurgical Group. The conventional welding heat input was welded at room temperature, and the heat affected zone and near the heat The highest hardness HV10 in the affected area is greater than 350; when the preheating temperature is higher than 150°C, the highest hardness HV ≤ 350 in the heat-affected zone a...
Embodiment 2
[0031] The actual composition (percentage by weight) of the low-C high-strength steel in this example is: C 0.18%, Si0.40%, Mn 1.62%, P 0.01%, S 0.002%, Al 0.04%, Nb 0.05%, V 0.085 %, Ni 0.45%, Ti 0.014, rolled into 110mm steel plate.
[0032] The production method of this embodiment is as follows: (1) Smelting process: the molten steel containing the above components is first smelted in an electric furnace, sent to an LF refining furnace for refining, and fed with an Al wire of 800 meters, and when the ladle temperature is ≥ 1600°C, the ladle VD Furnace vacuum treatment, adding 150kg of SiCa blocks before vacuuming, the vacuum degree is not more than 0.5 Torr, and the vacuum is broken when the vacuum holding time is ≥20 minutes, which solves the phenomenon that the molten steel is deoxidized by Al wire alone and the content of non-metallic inclusions in the steel is high, ensuring Ensure the purity of steel;
[0033] (2) Casting process: after the vacuum is broken, the tempe...
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