一种300-395mm特厚高温容器合金钢钢15NiCuMoNb-5-6-4的生产方法

By employing a process of large-thickness water-cooled ingot casting, whole-plate cleaning, low-temperature heating and normalizing rapid cooling, combined with large-reduction rolling and slow cooling treatment, the production problem of extra-thick high-temperature vessel alloy steel has been solved, and the manufacturing of high-performance extra-thick high-temperature vessel alloy steel has been realized.

CN117758150BActive Publication Date: 2026-07-17NANYANG HANYE SPECIAL STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NANYANG HANYE SPECIAL STEEL CO LTD
Filing Date
2023-12-27
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies cannot effectively produce ≥300mm thick high-temperature vessel alloy steel 15NiCuMoNb-5-6-4, and its mechanical properties cannot meet the requirements of high-temperature and high-pressure environments.

Method used

The process employs large-thickness water-cooled ingot casting, whole-plate cleaning, low-temperature heating, normalizing and rapid cooling, and slow cooling treatment, combined with large-reduction rolling and LF+VD smelting, to control chemical composition and inclusions in molten steel and ensure steel plate quality.

Benefits of technology

The 300-395mm extra-thick high-temperature vessel alloy steel produced has excellent mechanical properties, with significantly improved yield strength, tensile strength and low-temperature impact performance. It passes flaw detection and meets the requirements for use in high-temperature and high-pressure equipment.

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Abstract

本发明公开了一种300‑395mm特厚高温容器合金钢15NiCuMoNb‑5‑6‑4的生产方法，该钢板包括采用如下化学成分：C：0.09～0.11、Si：0.30～0.40、Mn：1.05～1.15、P≤0.010、S≤0.003、Nb：0.030～0.040、Cr：0.20～0.28、Ni：1.10～1.20、Mo：0.35～0.45、Cu：0.65～0.70、ALs：0.020～0.050，Ceq:0.49‑0.57，其它为Fe和残留元素；其生产方法通过大厚度锭型、大压下轧制和缓冷改善探伤性能；通过满板清理刷涂料确保钢锭表面质量；通过轧后快速冷却防止破碎晶粒恢复长大，得到细小均匀的原始晶粒；通过临界正火快冷获得良好的组织性能；与现有技术相比，本发明生产的300‑395mm特厚高温容器合金钢15NiCuMoNb‑5‑6‑4，不仅力学性能明显高于标准中最大厚度200mm的性能指标，而且，在低温冲击功方面更加突出先进，‑40℃横向冲击功达到150J以上，远超‑20℃横向冲击功27J指标。
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