Steel for deep-sea water pipe and rolling method thereof

Through unique chemical composition design and three-dimensional rolling process, the low-temperature toughness and welding performance of deep-sea water-proof pipes have been solved, improving product quality and production efficiency and meeting the needs of deep-sea service.

CN122406124APending Publication Date: 2026-07-17NANJING IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANJING IRON & STEEL CO LTD
Filing Date
2026-05-11
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing deep-sea riser pipes cannot simultaneously achieve good low-temperature toughness, fracture resistance, and weldability, resulting in unstable product quality, low production efficiency, and a mismatch between the performance of welded joints and the pipe body.

Method used

Employing a unique chemical composition design, including elements such as C, Mn, Ni, Mo, Cr, and Mg, and combining high-temperature heating, high-pressure descaling, and three-dimensional rolling processes, deep-sea water-resistant pipes are manufactured through low-temperature fast rolling and rapid cooling, refining the microstructure grains, improving the surface quality of the steel plate, and enhancing welding performance.

Benefits of technology

It improves the low-temperature toughness and fracture resistance of deep-sea riser pipes, enhances welding performance, increases production efficiency and product quality, and meets the requirements of deep-sea service environments.

✦ Generated by Eureka AI based on patent content.

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Abstract

本发明公开了一种深海隔水管材用钢，其主要化学成分及质量百分比包括：C：0.02%～0.04%，Mn：1.35～1.65%，P≤0.015%，S≤0.0010%，Al：0.010%～0.050%，O≤0.0015%，H≤0.0002%，Ni：0.10%～0.30%，Mo：0.31%～0.48%，Cr：0.20～0.40%，Mg：0.0010%～0.0020%，其余为Fe及不可避免杂质。本发明的优点是通过高温加热、高压除磷，应用立体轧制工艺，低温快轧快冷方式，提升隔水管材的低温韧性性能，改善抗断裂性能及焊接性能，提升钢板表面质量，细化组织晶粒，提高生产效率和产品品质，制出高强韧深海隔水管线钢。
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