一种低内应力耐候钢板及其制备方法

By optimizing the chemical composition and preparation process, the problem of uneven internal stress in steel plates for railway vehicles has been solved, resulting in low-cost, high-strength, and well-formable low-stress weather-resistant steel plates suitable for components such as railway vehicles, containers, and photovoltaic brackets.

CN122168990BActive Publication Date: 2026-07-17BENGANG STEEL PLATES CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BENGANG STEEL PLATES CO LTD
Filing Date
2026-05-12
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies for improving the strength of steel used in railway vehicles result in high alloy costs, increased sensitivity to welding cracks, uneven cooling and hardness of steel plates, and uneven distribution of internal stress, all of which affect formability and product quality, making it difficult to meet the requirements of low cost, heavy load, and lightweight.

Method used

By optimizing the chemical composition design and preparation process, controlling the Mn/C and Ti/N ratios, and employing two-stage controlled rolling, laminar flow cooling, slow cooling, and annealing treatment, internal stress is eliminated, thereby improving the uniformity and formability of the steel plate.

Benefits of technology

It achieves excellent uniformity and formability of low internal stress weathering steel plates, reduces production costs, and improves yield and production efficiency, making it suitable for high-safety components such as railway vehicles, containers, and photovoltaic brackets.

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Abstract

本发明涉及轧钢技术领域，具体涉及一种低内应力耐候钢板及其制备方法，化学成分如下：C0.054~0.074%、Si0.51~0.62%、Mn0.77~0.87%、P0.104~0.116%、S≤0.006%、Ti0.102~0.122%、Cr1.04~1.24%、Cu0.43~0.54%、V0.042~0.064%、Als0.026~0.056%、N≤0.0040%，并满足Mn / C=10.4~16.2，Ti / N=25~61，其余为Fe及杂质。本方案提供一种内应力分布均匀或无内应力、板型良好的钢带，提高热轧带钢的板型质量，减轻带钢应用过程中由于形变所带来的附加工序，提高成材率和生产效率。
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