CUASE ANALYSIS OF VALVE STEM RUPTURE ON MAIN STEAM VALVE OF SUPERCRITICAL 600 MW UNIT

XIE Yi1; GUO Jianting2; CHEN Hongdong1; MOU Shenzhou1 1.Hunan Provincial Electric Power Science Research Institute

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CUASE ANALYSIS OF VALVE STEM RUPTURE ON MAIN STEAM VALVE OF SUPERCRITICAL 600 MW UNIT

更新时间：2025-09-28

- CUASE ANALYSIS OF VALVE STEM RUPTURE ON MAIN STEAM VALVE OF SUPERCRITICAL 600 MW UNIT
- Thermal Power Generation Vol. 41, Issue 6, Pages: 69-73(2012)
- 作者机构：
  
  1. 湖南省电力公司科学研究院
  2. 中国科学院金属研究所
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621.3
- Published：2012
- 稿件说明：
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XIE Yi1, GUO Jianting2, CHEN Hongdong1, et al. CUASE ANALYSIS OF VALVE STEM RUPTURE ON MAIN STEAM VALVE OF SUPERCRITICAL 600 MW UNIT[J]. Thermal power generation, 2012, 41(6): 69-73.
DOI：

XIE Yi1, GUO Jianting2, CHEN Hongdong1, et al. CUASE ANALYSIS OF VALVE STEM RUPTURE ON MAIN STEAM VALVE OF SUPERCRITICAL 600 MW UNIT[J]. Thermal power generation, 2012, 41(6): 69-73. DOI：

摘要

采用宏观形貌观察、化学成分分析、显微组织观察与力学性能试验等方法

对某超临界600MW机组主汽阀阀杆断裂原因进行了分析。结果表明

该高温合金阀杆母材弥散分布富Al、富Si、富Ti和富Mo的强化颗粒

显微组织异常

且拉伸塑性与冲击韧性较差

是导致其在丝扣退刀槽处发生脆性断裂的主要原因。建议对同批次和同类型的主汽阀阀杆采取适当的措施进行处理

确保机组安全运行。

Abstract

By using the macro-observation of appearance

the chemical composition analysis

the microstructure observation

and the mechanical test method

the causes leading to valve stem rupture of main steam valve used for one supercritical 600 MW unit have been analysed.Results show that some strengthened particles

such as Al-rich

Si-rich

Ti-rich

and Mo-rich particles have dispersed into the base-metal of superalloy stem

its micro-structure being abnormal

boasting poor tensile ductility and bad impact toughness

and finally leading to brittle rupture at the knife-withdrawing slot of screw threads.It is recommended the treatment measures should be taken for main steam valve stems of same batch and similar modes

so as to ensure safe operation of units.

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