焊管2025，Vol.48Issue(10)：34-39,6.DOI:10.19291/j.cnki.1001-3938.2025.10.006
敏化热处理对2205双相不锈钢焊管组织性能的影响
Effect of Sensitization Heat Treatment on Microstructure and Properties of 2205 Duplex Stainless Steel Welded Pipe
摘要
Abstract
In order to explore the influence of different sensitization heat treatment temperatures on microstructure and mechanical properties of 2205 duplex stainless steel welded pipes,heat treatment tests were performed at 450℃,650℃,727℃and 850℃.Corrosion resistance was analyzed under different processes through metallographic analysis,tensile and impact tests.Results show that under sensitization temperature of 450℃,650℃or 727℃,metallograpic structure of 2205 stainless steel welded pipes maintains austenite-ferrite phase equilibrium and the hardness meets the standard requirements.In contrast,sensitization at 850℃causes local overheating,leading to transformation from austenite to ferrite,increased hardness and decreased impact toughness with fractures showing brittle fractures characteristics.Corrosion tests under simulated service conditions demonstrated that all sensitized samples met the standard requirements for both uniform corrosion rate and maximum pitting corrosion rate.Moreover,at 850℃,chromium-depleted zones formed along grain boundaries,making them susceptible to intergranular corrosion cracking under combined influence of corrosive environments and bending stress.These findings provide experimental support for optimizing heat treatment processes and engineering applications of multi-channel welded pipes.关键词
2205双相不锈钢焊管/敏化热处理温度/显微组织/力学性能/耐蚀性能Key words
2205 duplex stainless steel welded pipe/sensitization heat treatment temperature/microstructure/mechanical properties/corrosion resistance分类
矿业与冶金引用本文复制引用
王维东,郜飞,李苏,汪海涛,孙冬冬,臧伟,鲜林云,齐随翔,王浩臻..敏化热处理对2205双相不锈钢焊管组织性能的影响[J].焊管,2025,48(10):34-39,6.基金项目
中国石油天然气股份有限公司科学研究与技术开发项目"深海天然气水合物开采机理与技术研究"(项目编号2024DJ96). （项目编号2024DJ96）
