Super-thick EH36 steel for offshore wind power pipe pile and preparation method thereof

Abstract

The invention relates to super-thick EH36 steel for an offshore wind power pipe pile. The super-thick EH36 steel for the offshore wind power pipe pile comprises the following chemical components in percentage by mass: .015 to 0.18 percent of C, 0.15 to 0.30 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.0070 percent of P, less than or equal to 0.0030 percent of S, 0.050 to 0.070 percent of Nb, 0.015 to 0.030 percent of V, 0.08 to 0.020 percent of Ti, 0.030 to 0.050 percent of Al, 0.15 to 0.40 percent of Ni, 0.10 to 0.20 percent of Cr, and the balance of Fe. A production process flow comprises the following steps: performing converter operation, performing LF refining, performing vacuum degasifying, performing Ca treatment, performing continuous casting, dehydrogenizing, rolling, performing air cooling, performing high-temperature hot straightening, and normalizing. According to the production process flow, the super-thick EH36 steel of 90 to 120 mm for the offshore wind power pipe pile, which is high in unit weight, high in strength, high in impact toughness, small in thickness tolerance and high in straightness and does not have a surface defect is obtained.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to EH36 steel with extra thickness, single weight, small thickness tolerance and good straightness for offshore wind power pipe piles and a preparation method thereof. Background technique [0002] As a renewable energy source, wind power is regarded as the future of clean energy. Wind power provides clean energy for households and businesses, reduces climate change carbon pollution, and increases national standard economic competitiveness. The domestic wind energy market will remain strong for decades to come due to continued low prices, more efficient wind turbines, and rapidly growing demand worldwide. [0003] In order to reduce the levelized cost of electricity generation of offshore wind power projects, the size of wind turbines is constantly increasing. The larger the wind turbine, the stricter the requirements for supporting facilities. Since offshore w...

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Problems solved by technology

However, this technology does not study the important technical indicators related to the user's use, such as steel plate flatness, thickness tolerance, and large unit weight.

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