HR3C钢管高温服役脆化行为特征及预防泄漏措施  

Characterization of embrittlement behavior and leakage prevention measures for HR3C steel pipe in high temperature service

作　　者：句光宇 Ju Guangyu(Central-China Electric Power Research Institute,China Datang Corporation Science and Technology Research Institute,Zhengzhou Henan 450001,China)

机构地区：[1]中国大唐集团科学技术研究院有限公司华中电力试验研究院,河南郑州450001

出　　处：《金属热处理》2020年第11期26-32,共7页Heat Treatment of Metals

摘　　要：HR3C钢管因具有优良的抗蒸汽氧化性能广泛应用于566、600及620℃等级超/超超临界机组,但是其在高温时效过程中表现出明显的脆化现象,严重影响机组安全稳定运行。结合脆化失效案例的典型特征对HR3C钢管在高温时效和服役态下的脆化现象、脆化机理、脆化防治进行了系统的分析,提出了针对脆化HR3C钢管泄漏的预防性措施。最后指出了HR3C钢的应用困境和面临的挑战。HR3 C steel pipe is widely used in 566,600 and 620℃super/ultra supercritical pressure units because of its excellent resistance to steam oxidation,but it shows obvious embrittlement phenomenon in the process of high temperature aging,which seriously affects the safety and stable operation of the unit.Based on the typical characteristics of embrittlement failure cases,the embrittlement phenomenon,embrittlement mechanism and embrittlement prevention of HR3 C steel pipe under high temperature aging and service state were systematically analyzed,and the preventive measures for the leakage of brittle HR3 C steel pipe were put forward.Finally,the application difficulties and challenges of HR3 C steel were pointed out.

关 键 词：HR3C钢管 奥氏体耐热钢 时效脆化 行为特征 M_(23)C_6 失效 

分 类 号：TG111.91[金属学及工艺—物理冶金]