High-strength steel for corrosion-resistant fastener for ocean wind power and production method

Abstract

The invention discloses high-strength steel for a corrosion-resistant fastener for ocean wind power and a production method, and belongs to the technical field of ocean wind power fastener materials.The high-strength steel for the corrosion-resistant fastener for ocean wind power comprises the following main chemical components in percentage by mass: 0.20% to 0.30% of C, 0.60% to 0.80% of Si, 0.40% to 0.60% of Mn, 1.20% to 1.40% of Cr, 0.15% to 0.30% of Mo, 0.30% to 0.50% of Ni, 0.20% to 0.40% of Cu, 0.10% to 0.20% of Sn, 0.020% to 0.037% of Al, 0.010% to 0.015% of N, 0.0015% to 0.0035% of Mg, less than or equal to 0.020% of P, less than or equal to 0.010% of S and the balance of Fe and inevitable impurities. The grain size and austenite grain size of the steel are smaller than or equal to 11 [mu]m, the steel has high strength and high toughness, the heat treatment mechanical property reaches the 10.9 grade or above, the KV2 impact toughness value at -80 DEG C is larger than or equalto 65 J, and the chloride ion corrosion resistance is 1.5 times or above that of market general 10.9-grade wind power bolt steel.

Description

technical field [0001] The invention belongs to the technical field of fastener materials for marine wind power, and more specifically relates to a high-strength steel for corrosion-resistant fasteners for marine wind power and a production method. Background technique [0002] my country has a vast territory, a long coastline, and abundant wind energy resources. However, my country has not been developing wind turbines for a long time, and it was not until the last ten years that it embarked on the road of industrialization. In recent years, with the support of national policies, the wind power industry has achieved rapid development, and the mainstream models have shifted to large-capacity units above the megawatt level. The key components used in offshore wind power need to serve for more than 25 years in the environment of low temperature, humidity, corrosion, and alternating loads. Ion corrosion performance and so on put forward very high requirements. [0003] Domes...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem of poor corrosion resistance of existing marine wind power fasteners, the present invention provides a steel for high-strength marine wind power corrosion-resistant fasteners and a production method. The grain size of the steel is less than or equal to the austenite grain size 11μm, with high strength and high toughness, heat treatment mechanical properties above 10.9, KV at -80°C 2 The impact toughness value is ≥65J, and the chloride ion corrosion resistance is more than 1.5 times that of the general 10.9 wind power bolt steel in the market

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