An Analysis on Creep-Fatigue Failure of Main Steam Pipe of 12CrMoV Steel

Special Steel ›› 2009, Vol. 30 ›› Issue (1): 68-69.

An Analysis on Creep-Fatigue Failure of Main Steam Pipe of 12CrMoV Steel

Wang Haiyan¹ , Gao Xueyuan², Liu Zongchang¹, Wang Yufeng¹

1 Material and Metallurgy College, Inner Mongolia University of Science and Technology, Baotou 014010 ；
2 The First Power Station of Baotou, Baotou 014010

Received:2008-07-21 Online:2009-02-01 Published:2022-11-30

12CrMoV钢主蒸汽管道的蠕变疲劳失效分析

王海燕¹, 高雪云², 刘宗昌¹, 王玉峰¹

1内蒙古科技大学材料与冶金学院，包头014010；
2包头第一热电厂，包头014010

作者简介:王海燕(1975-),女，讲师,2004年内蒙古科技大学毕业，金属材料各向异性与相变机理研究。

Abstract

Abstract: Failure crack character of φ273 mm x 22 mm main steam pipe of 12CrMoV steel (0. 12C, 0. 45Cr, 0. 31 Mo, 0. 22V) serviced for 30 000 h under the condition of creep-fatigue interaction serviced al power station has been studied and analyzed. Results showed that the crack developed and spread along grain-boundary, and the stress concentration formed at oxide defect of steel tube surface induced by creep, existence of coarse carbide and thermal fatigue induced by high temperature impact load were main cause to form crack of inner surface of steel pipe.

Key words: 12CrMoV Steel Pipe, Creep, Fatigue, Inclusion, Carbide, Failure

摘要： 研究和分析了电厂12CrMoV钢(%:0.12C、0.45Cr、0.31Mo、0.22V)φ273mm×22mm主蒸汽管道服役30000h后疲劳蠕变交互作用的失效裂纹特征。结果表明,裂纹延晶前扩展,蠕变诱发钢管表面氧化物缺陷产生的应力集中,粗大碳化物的存在,高温冲击载荷引起的热疲劳是钢管内表面形成裂纹的主要原因。

关键词: 12CrMoV, 钢管, 蠕变, 疲劳, 夹杂物, 碳化物, 失效

Wang Haiyan, Gao Xueyuan, Liu Zongchang, Wang Yufeng. An Analysis on Creep-Fatigue Failure of Main Steam Pipe of 12CrMoV Steel[J]. Special Steel, 2009, 30(1): 68-69.

王海燕, 高雪云, 刘宗昌, 王玉峰. 12CrMoV钢主蒸汽管道的蠕变疲劳失效分析[J]. 特殊钢, 2009, 30(1): 68-69.