Wind power steel and preparation method thereof

Abstract

The invention provides wind power steel and a preparation method thereof. The wind power steel comprises, by weight percentage, 0.05-0.10% of C, 0.31-0.42% of Si, 1.26-1.42% of Mn, less than or equalto 0.015% of P, less than or equal to 0.008% of S, 0.015-0.028% of Als, 0.10-0.15% of V, 0.80-1.35% of Cr, 0.10-0.20% of Mo and 0.08-0.15% of Ce, wherein the weight percentage ratio of the sum of theCr and the Mn to Mo is greater than or equal to 16.7 and less than or equal to 22.2, and the weight percentage sum of 5C, 8V and Mn is greater than or equal to 2.56% and less than or equal to 2.87%. According to the wind power steel and the preparation method thereof, the mixing ratios of the constituents are designed, and the corresponding preparation method combining hot rolling and normalizingtreatment is selected, so that after an obtained steel plate is subjected to normalization, the yield strength is greater than or equal to 420 MPa; the tensile strength ranges from 540 MPa to 680 MPa;the elongation A is greater than or equal to 32%; KV2 achieved at the temperature of minus 40 DEG C is greater than or equal to 220 J, and KV2 achieved at the temperature of minus 50 DEG C is greaterthan or equal to 200 J; in addition, the same steel plate is stable and uniform in performance and has the beneficial effects of being low in low-temperature toughness, high in elongation, excellentin corrosion resistance and the like; and the wind power steel can be widely applied to offshore wind power generation tower engineering steel structures.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a wind power steel and a preparation method thereof. Background technique [0002] Wind energy is a renewable, non-polluting, green and clean energy with abundant reserves. About 2% of the Earth's solar energy is converted into wind energy. The main form of wind energy utilization is wind power, which is environmentally friendly, with low cost and significant benefits. At present, more than 80 countries around the world have begun to use wind energy, and some countries have adopted wind energy as the main power generation method. With the increasing frequency of smog and haze, the government pays more and more attention to environmental protection, and the clean energy represented by wind power has huge room for development. [0003] The steel plate used for wind power towers is called wind power steel, but the existing wind power steel generally do...

AI Technical Summary

Problems solved by technology

[0003] The steel plate used for wind power towers is called wind power steel, but the existing wind power steel generally does not consider the corrosion resistance of steel. It needs to use anti-corrosion coating when it is used at sea, which has a great impact on the health of the coating workers and the marine ecological environment. heavy maintenance workload

Although some invented steels have atmospheric corrosion resistance, they may not be able to serve in seawater, and the strength of these invented steels after normalizing cannot meet the service requirements of 420MPa or the service temperature is as low as -20°C

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