一种屈服强度480MPa级矿用U型钢及其制备方法

By optimizing the chemical composition and process control, the problems of low yield strength and poor durability of mining U-shaped steel have been solved, resulting in U-shaped steel with high yield strength and high elongation, which is suitable for support in deep mines and large deformation mining tunnels, improving safety and economy.

CN117535585BActive Publication Date: 2026-07-17TANGSHAN IRON & STEEL GROUP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TANGSHAN IRON & STEEL GROUP
Filing Date
2023-10-12
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing mining U-shaped steel has low yield strength and poor durability. It is prone to cracking and deformation during processing, resulting in long construction cycles, safety hazards and high manufacturing costs. It is also difficult to meet the requirements for high yield strength.

Method used

By optimizing the chemical composition design and process control, using precise ranges of elements such as C, Si, Mn, V, Ti, and Al, and combining specific rolling processes, including roughing and finishing rolling, controlling overheating and pulling speed, the formation of microcracks is avoided, ensuring high yield strength and high elongation.

Benefits of technology

It achieves a yield strength ≥480MPa, tensile strength ≥650MPa, elongation ≥18%, and does not crack after cold bending. It has excellent comprehensive performance and is suitable for support in deep mines and large deformation mining tunnels.

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Abstract

本发明公开了一种屈服强度480MPa级矿用U型钢及制备方法，属于冶金技术领域。其化学成分质量含量为C：0.22～0.25％，Si：0.30～0.60％，Mn：1.38～1.60％，P≤0.035％，S≤0.030％，V：0.065～0.085%，Ti≤0.01%，Al：0.018～0.025%，余量为Fe和不可避免的杂质。其粗轧过程，BD1和BD2各三道次往复轧制，总变形量70～85%，相邻道次变形间隔48～60s；精轧过程，总变形量50～75%，相邻道次变形间隔10～15s。本发明生产的热轧矿用U型钢力学性能良好，屈服强度≥480MPa、抗拉强度≥650MPa、延伸率≥18%，冷弯后不开裂。
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