Steel for wind power, and production method thereof

Abstract

The invention discloses a steel for wind power, and a production method thereof. The yield strength, the tensile strength, the elongation percentage A, the -40DEG C impact energy, the -60DEG C impact energy and the yield-tensile ratio of the steel for wind power are not lower than 420MPa, 600-680MPa, not lower than 30%, not lower than 230J, not lower than 200J and not larger than 0.70 respectively. The steel for wind power comprises, by mass, 0.085-0.16% of C, 0.21-0.40% of Si, 1.25-1.60% of Mn, 0.015% or less of P, 0.010% or less of S, 0.008-0.015% of Ti, 0.018-0.05%of Als, 0.05-0.15% of Ni, 0.010-0.10% of Be, and the balance of Fe and inevitable impurities, wherein a mass percentage ratio of Be/Ni is 0.07-2.0. The steel for wind power has the characteristics of high strength, low yield-tensile ratio and excellent low temperature toughness, and improves the technical problems of low strength and ordinary low temperature performances of wind power steels in the prior art.

Description

technical field [0001] The invention relates to the technical field of steel materials, in particular to a steel for wind power and a production 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. my country is rich in wind energy resources, with a total wind energy reserve of 3.226 billion kilowatts, and the actual total amount of wind energy that can be developed on land is about 250 million kilowatts, ranking first in the world. 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 main equipment of wind power generation consists of a nacelle, rotor blades, shaft, low-speed shaft, gearbox, generator, yaw device, electronic control device and tower (tower). Among th...

AI Technical Summary

Problems solved by technology

The mechanical properties of the steel plate are excellent, but the elongation effect is relatively poor, and there is still a large room for optimization of the seismic performance, and the impact energy value of the invented steel at -40°C is up to 172J, and the impact energy value at -50°C is less than 100J, and the low temperature toughness is poor

Although the yield strength ratio of the invention steel is low, due to the low strength, the highest yield strength in the embodiment is 335MPa, the control difficulty is relatively low, and the low temperature performance is average, and normalizing heat treatment is required to obtain the above performance, which increases energy consumption. , increasing the production cost

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