High-phosphorus rare earth economical weathering steel and method for manufacturing the same

By adding P-Cu-RE composite material to high-phosphorus rare earth weathering steel and using a low-alkalinity smelting process, the problems of high cost and insufficient corrosion resistance of weathering steel have been solved, realizing the manufacture of high-strength, low-cost weathering steel suitable for structural components such as power transmission towers.

CN122406097APending Publication Date: 2026-07-17ZHEJIANG SPIATE NEW MATERIAL TECHNOLOGY CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG SPIATE NEW MATERIAL TECHNOLOGY CO LTD
Filing Date
2025-08-04
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing weathering steels rely on precious metals such as Cr, Ni, and Cu, which are costly and scarce. High-phosphorus steels are prone to cold brittleness, and traditional processes struggle to maintain a balance between high corrosion resistance and low cost.

Method used

High-phosphorus rare earth weathering steel is used. By adding La, Ce rare earth elements and a small amount of Cu, and by precisely controlling the P content, a stable passivation layer is constructed. The P-Cu-RE composite addition replaces the traditional Cr-Ni-Cu system. Low-alkalinity smelting and controlled rolling and cooling processes are adopted to reduce alloy costs and improve corrosion resistance.

Benefits of technology

It achieves high strength and excellent corrosion resistance in weathering steel, reducing costs by about 40%, while also possessing good mechanical properties and weldability. The average corrosion rate after 72 hours is reduced to one-third that of ordinary steel, meeting the corrosion resistance requirements of structural components such as power transmission towers.

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Abstract

本发明为一种高磷稀土经济型耐候钢及其制造方法，属于耐大气腐蚀钢技术领域，包含以下化学成分：C：0.06～0.20、Si：≤0.55、Mn：≤1.50、P：0.090～0.120、S：≤0.015、Cu：0.15～0.35、REM，坯料加热温度为1180～1220℃；采用控轧控冷工艺，开轧温度1050～1100℃；终轧温度≤880℃；轧后控制冷却，终冷温度550～700℃；通过P‑Cu‑RE复合添加取代了传统耐候钢Cr‑Ni‑Cu的添加策略，大幅降低成本；其力学性能满足抗拉强度(Rm)470～630MPa，屈服强度(ReH)≥355MPa，断后伸长率(A)≥22％，室温冲击功≥94.5J；72小时周期浸润加速腐蚀试验，腐蚀速率≤1.8g / (m2*hr)，产品主要应用于具有免涂装少维护需求的建筑钢结构工程，包括输电铁塔及其它塔桅结构、车间、厂房、仓库及其它公共建筑的钢架支撑结构。
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Citation Information

Patent Citations

  • CN118241111B

  • CN118756064A