一种水电用钢板及其制备方法

By using ultra-low carbon design and adding micro-alloying elements, combined with two-stage rolling and tempering heat treatment, the problems of core strength, toughness and weldability of 1000MPa grade hydropower steel plates were solved, achieving improvements in ultra-high strength, excellent low-temperature toughness and weldability.

CN119061320BActive Publication Date: 2026-07-17SHOUGANG GROUP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHOUGANG GROUP CO LTD
Filing Date
2024-09-03
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing 1000MPa grade high-strength hydropower steel plates with a thickness of 100mm to 150mm are difficult to improve in terms of weldability while meeting the requirements for core strength and toughness.

Method used

Adopting an ultra-low carbon design, appropriate amounts of microalloying elements such as Ni, Cr, and Mo are added to control the chemical composition to form bainitic and martensitic microstructures. The cooling process is optimized through two-stage rolling and quenching and tempering heat treatment, including heating, quenching, and tempering, to improve the uniformity of the microstructure.

Benefits of technology

It achieves ultra-high strength and excellent low-temperature toughness in steel plates, while improving welding performance, especially the microstructure and property uniformity of thick steel plates.

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Abstract

本发明提供了一种水电用钢板及其制备方法，属于钢材制备领域。所述钢板的厚度为100mm～150mm，所述钢板的化学成分包括：C、Si、Mn、P、S、Alt、Cr、Mo、Cu、Ni、V、B以及Fe；其中，以质量分数计，C的含量为0.04％～0.09％，Si的含量为0.05％～0.25％，Mn的含量为0.50％～1.50％，P的含量≤0.007％，S的含量≤0.003％，Alt的含量为0.01％～0.05％，Cr的含量为0.20％～0.80％，Mo的含量为0.20％～0.70％，Cu的含量为0.20％～2.50％，Ni的含量为1.0％～5.0％，V的含量为0.08％～0.30％，B的含量≤0.0020％。通过在超低碳的基础上，采用低磷低硫和添加适量Ni、Cr、Mo等微合金元素的成分设计，实现钢板的金相组织结构为贝氏体相变和马氏体，获得综合性能优异的组织，使钢板获得超高强度并兼具优良的低温韧性和焊接性能，同时改善了钢板尤其是厚规格钢板厚度方向的组织和性能均匀性。
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