电焊机2025，Vol.55Issue(6)：104-111,8.DOI:10.7512/j.issn.1001-2303.2025.06.14
新一代马氏体耐热钢G115的焊接工艺研究
Research Progress on Welding Process of New Generation Martensitic Heat-resistant Steel G115
马志宝 1张明申 2王学 3张玮 4姜海峰 2王庆峰 1万夫伟 5蔡文河 1丛相州 6陈鑫 1周浩1
作者信息
- 1. 中国大唐集团科学技术研究总院有限公司 华北电力试验研究院,北京 100040
- 2. 大唐郓城发电有限公司,山东 菏泽 274700
- 3. 武汉大学 动力与机械学院,湖北 武汉 430072
- 4. 东方电气集团东方锅炉股份有限公司,四川 自贡 643002
- 5. 中国电建集团核电工程有限公司,山东 济南 250102
- 6. 北京国电富通科技发展有限责任公司,北京 100070
- 折叠
摘要
Abstract
A systematic study was conducted on the weldability,development of matching welding materials,and welding processes for the new-generation martensitic heat-resistant steel G115(08Cr9W3Co3VNbCuBN),used in high-temperature pipelines of the world's first 630℃ultra-supercritical thermal power unit.The research indicates that G115 steel welding ex-hibits a significant tendency toward hot cracking,a certain susceptibility to cold cracking(effectively mitigated by preheat-ing≥150℃),and a propensity for aging embrittlement(manifested as reduced impact toughness during long-term high-temperature service).Concurrently,its boron(B)-containing composition design potentially lowers the risk of Type IV creep cracking in the heat-affected zone(HAZ).Domestically developed dedicated welding materials for G115,including elec-trodes,submerged arc welding consumables,and argon arc welding wires,demonstrate excellent high-temperature rupture strength in their deposited metal.Extrapolation of data from tests exceeding 10,000 hours indicates that the 100,000-hour rupture strength can reach over 80%of the base metal,with satisfactory matching of mechanical properties.Comparative analysis of four welding processes—shielded metal arc welding(SMAW),submerged arc welding(SAW),vibrating wire feeding argon arc welding(TIPTIG),and automatic argon arc welding(AUTOTIG)—revealed that:TIPTIG and AUTOTIG joints exhibit significantly reduced HAZ widths(1.7-2.5 mm)and achieve impact absorbed energy exceeding 100 J;SMAW and SAW joints exhibit impact toughness ranging from 41-50 J,all meeting the technical requirement(≥41 J);Narrow-gap argon arc welding processes enhance the joint's long-term creep life by narrowing the high-temperature weak zone(HAZ).Based on these findings,the research team spearheaded the development of CSTM group standards.These standards have standardized welding material acceptance criteria,joint performance indicators,key process parameters(e.g.,preheating tem-perature 200-300℃,interpass temperature 150-300℃,post-weld heat treatment at 770±10℃),and quality inspection meth-ods,providing crucial technical support for the engineering application of G115 steel in power generation projects.关键词
G115耐热钢/焊接性/焊接材料/焊接工艺Key words
heat-resistant steel G115/weldability/welding materials/welding technology分类
矿业与冶金引用本文复制引用
马志宝,张明申,王学,张玮,姜海峰,王庆峰,万夫伟,蔡文河,丛相州,陈鑫,周浩..新一代马氏体耐热钢G115的焊接工艺研究[J].电焊机,2025,55(6):104-111,8.
