在役电站主汽阀螺柱硬度抽检不合格原因  

Reasons for unqualified hardness sampling inspection of main steam valve stud in in-service power station

作　　者：赵立 钟丰平 唐勇 胡建胜 应陈锴 余挺 ZHAO Li;ZHONG Fengping;TANG Yong;HU Jiansheng;YING Chenkai;YU Ting(Zhejiang Academy of Special Equipment Science,Hangzhou 310020,China;Huarun Power Plant(Wenzhou)Co.,Ltd.,Wenzhou 325800,China)

机构地区：[1]浙江省特种设备科学研究院,杭州310020 [2]华润电力(温州)有限公司,温州325800

出　　处：《理化检验(物理分册)》2025年第1期33-36,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

基　　金：浙江省科技厅领雁计划(2022C01118)。

摘　　要：在某发电公司1 000 MW超临界机组主汽阀螺柱的定期检验过程中,发现其硬度不合格,采用宏观观察、化学成分分析、力学性能测试、金相检验、扫描电镜和能谱分析等方法对其硬度不合格原因进行分析。结果表明:该螺柱存在组织老化、碳化物析出的问题。最后提出了改进建议,以为同类机组问题提供借鉴。During the periodic inspection of the main steam valve stud of a 1000 MW supercritical unit in a power generation company,it was found that the hardness was unqualified.The reasons for the unqualified hardness were analyzed by macroscopic observation,chemical composition analysis,mechanical property test,metallographic examination,scanning electron microscope and energy spectrum analysis.The results show that the stud had the problems of microstructure aging and carbide precipitation.Finally,suggestions for improvement were put forward to provide reference for similar unit problems.

关 键 词：主汽阀螺柱 硬度偏低 检验检测 可用性分析 老化 碳化物析出 

分 类 号：TG141[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—金属材料]