Welding wire for argon arc welding of martensitic heat-resistant steel g115, preparation method and application thereof

By using a specific composition of welding wire and welding process for argon arc welding of martensitic heat-resistant steel G115, the problem of balancing strength, hardness and toughness in G115 pipe welding has been solved, achieving high-strength, high-hardness and high-toughness welded joints, suitable for welding G115 steel pipes under high temperature and high pressure environments.

CN122400883APending Publication Date: 2026-07-17SHANDONG TUONENG NUCLEAR POWER TESTING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG TUONENG NUCLEAR POWER TESTING CO LTD
Filing Date
2026-03-19
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing G115 pipe welding wires are insufficient to balance the high strength, high hardness and high toughness of welds, especially for welded joints operating under high temperature and high pressure environments with stringent performance requirements.

Method used

Using G115 martensitic heat-resistant steel argon arc welding wire with specific composition, C and N are used as precipitation strengthening elements, Ti, Zr, V, Nb and Al combine with C and N to form composite carbonitride clusters, W delays the precipitation of composite carbonitrides, RE, B and Co strengthen grain boundaries, and combined with manual TIG welding and vibration hot wire TIG welding processes, the strength, hardness and toughness of the welded joint are optimized.

Benefits of technology

It achieves a balance of high strength, hardness and impact toughness in the welded joint. The tensile strength of the weld zone is ≥680MPa and the impact absorption energy is ≥90J. The welded joint has excellent hardness and toughness and is suitable for welding large-size, thick-walled G115 steel pipes.

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Abstract

本申请公开了一种马氏体耐热钢G115氩弧焊用焊丝及制备方法和应用，涉及氩弧焊接领域。马氏体耐热钢G115氩弧焊用焊丝的成分包括：C 0.08~0.15wt%，N 0.001~0.07wt%，Si≤0.5wt%，0.5≤Mn≤1.0wt%，Cr 8.4~10.5wt%，Cu≤0.8wt%，Ni≤0.6wt%，Ti≤0.02wt%，Zr ≤0.05wt%，V 0.1~0.3wt%，W 2.1~3.3wt%，Nb 0.01~0.12wt%，Al≤0.03wt%，RE≤0.01wt%，B≤0.01wt%，Co 2.5~3.5wt%。该焊丝具有与母材相匹配的优异力学性能和冲击韧性。
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