Development of Submerged Arc Welding Materials for G115 Steel Used in Ultra-Supercritical Units

MIAO Xingping; CHU Chenggang; FAN Yangyang; LONG Binghong; WANG Xue

doi:10.7512/j.issn.1001-2303.2025.06.12

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Development of Submerged Arc Welding Materials for G115 Steel Used in Ultra-Supercritical Units
Vol. 55, Issue 6, Pages: 88-94(2025)
Received：10 May 2025，

Revised：23 May 2025，

Published：20 June 2025
DOI： 10.7512/j.issn.1001-2303.2025.06.12
稿件说明：

移动端阅览

缪兴平，楚成刚，范阳阳，等.超超临界机组用G115钢埋弧焊材的研制［J］.电焊机，2025，55（6）：88-94. DOI： 10.7512/j.issn.1001-2303.2025.06.12.

MIAO Xingping, CHU Chenggang, FAN Yangyang, et al.Development of Submerged Arc Welding Materials for G115 Steel Used in Ultra-Supercritical Units[J].Electric Welding Machine, 2025, 55(6): 88-94. DOI： 10.7512/j.issn.1001-2303.2025.06.12.

摘要

为满足新一代马氏体耐热钢G115在超超临界机组中的规模化应用需求，针对其配套埋弧焊材进行了系统性的配方设计与性能评估。焊剂采用CaF₂-CaO-MgO-Al₂O₃-SiO₂基超低氢高碱度渣系（碱度BIIW=3.6）设计，扩散氢含量达H4超低氢水平，通过巴顿刚性固定冷裂纹试验验证，在预热温度200 ℃条件下可有效预防冷裂纹的发生。焊丝采用Cr-W-Co-V-Nb-C-N复合强化路线，确保熔敷金属在不同焊接参数和热处理条件下的综合性能稳定。高温持久试验表明，熔敷金属在650 ℃、10万小时下的持久强度为86.5 MPa，满足超超临界机组的设计需求。本研究所开发的XY-AF93焊剂和XY-S93焊丝配方设计兼顾强韧化与可焊性，是实现焊缝优异抗裂性和高温持久强度的关键。研究成果为G115钢在超超临界机组中的应用提供了可靠的焊材解决方案。

Abstract

To meet the demands for large-scale application of the new generation martensitic heat-resistant steel G115 in ultra-supercritical units

a systematic formulation design and performance evaluation were carried out for its supporting submerged arc welding materials. The flux was designed based on a CaF

-CaO-MgO-Al

-SiO

ultra-low hydrogen high-alkalinity slag system (with a basicity BIIW=3.6)

achieving an ultra-low hydrogen level of H4. Through the Barton rigid fixed cold crack test

it was verified that cold crack occurrence can be effectively prevented under a preheating temperature of 200 ℃. The welding wire adopts a Cr-W-Co-V-Nb-C-N composite strengthening route to ensure the comprehensive performance stability of the deposited metal under different welding parameters and heat treatment conditions. High-temperature creep tests showed that the strength of the deposited metal at 650 ℃ for 100

000 hours is 86.5 MPa

meeting the design requirements of ultra-supercritical units. The XY-AF93 flux and XY-S93 welding wire formulations developed in this study balance strength and toughness with weldability

and are key to achieving excellent crack res

istance and high-temperature sustained strength of the weld. The research results provide a reliable welding material solution for the application of G115 steel in ultra-supercritical units.

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references

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