An easy-to-weld high-strength and tough 500MPa grade steel plate for wind power and its preparation method

By reasonably preparing chemical components in wind power steel plates and using TMCP rolling and critical annealing heat treatment processes, the problem of taking into account both high strength and low temperature impact work in high cold and remote sea areas is solved, and the effects of high strength, good welding performance and high impact toughness are achieved.

CN116536580BActive Publication Date: 2025-03-28UNIV OF SCI & TECH BEIJING
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Patent Information

Application Number
CN202310414696.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-04-18
Publication Date
2025-03-28
Estimated Expiration
2043-04-18

AI Technical Summary

Technical Problem

It is difficult for existing wind power steel to take into account the impact work of high-strength and -60℃ steel plates in high-altitude and remote sea areas, resulting in insufficient welding performance and low-temperature toughness.

Method used

Steel plates with specific chemical compositions, including C, Si, Mn, Mo, Cr, Nb, Ni, Ti, B, V and other elements, are used to control the rolling and critical annealing heat treatment process to optimize the structural structure and mechanical properties of the steel plate.

Benefits of technology

A wind power steel plate with high strength, good welding performance and high impact toughness at -60℃ was achieved, with a yield strength of ≥500Mpa, an impact work of ≥130J in -60℃, and a thermal simulation impact work of ≥95J after welding.

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Abstract

The invention discloses an easy-to-weld high-toughness 500MPa grade steel plate for wind power and a preparation method thereof. The steel for wind power includes the following components by weight percentage: C: 0.02-0.05%, Si: 0.1-0.3%, Mn: 1.00-1.50%, Mo: 0.15-0.5%, Cr: 0.15-0.5%, Nb: 0.04-0.1%, Ni: 0.2-0.5%, Ti: 0.01-0.05%, Alt: 0.01-0.05%, B: 0.001%-0.002%, V: 0-0.08%, N≤0.005%, P≤0.01%, S≤0.006%, and the rest is Fe and unavoidable impurities. The wind power steel adopts a low-carbon microalloying component system, and the preparation method includes billet heating, TMCP finishing rolling process, cooling process and critical annealing heat treatment. The invention improves the strength and impact toughness of steel for wind power generation, with a yield strength of ≥580MPa, an impact energy at -60°C of ≥130J, and a thermal simulation impact energy after -60°C welding of ≥95J.
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