ANALYSIS OF BOLT FAILURE FOR HIGH PRESSURE BYPASS VALVE OF ULTRA-SUPERCRITICAL 600 MW UNIT

ZHENG Fangping; CUI Xionghua; WANG Hongzhe; TANG Liying; CUI Jinwen Xi'an Thermal Power Research Institute Co.

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ANALYSIS OF BOLT FAILURE FOR HIGH PRESSURE BYPASS VALVE OF ULTRA-SUPERCRITICAL 600 MW UNIT

Thermal Power Generation Vol. 41, Issue 8, Pages: 86-90(2012)

更新时间：2025-09-28

- ANALYSIS OF BOLT FAILURE FOR HIGH PRESSURE BYPASS VALVE OF ULTRA-SUPERCRITICAL 600 MW UNIT
- 作者机构：
  
  西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621
- Published：2012
- 稿件说明：
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ZHENG Fangping, CUI Xionghua, WANG Hongzhe, et al. ANALYSIS OF BOLT FAILURE FOR HIGH PRESSURE BYPASS VALVE OF ULTRA-SUPERCRITICAL 600 MW UNIT[J]. Thermal Power Generation, 2012, 41(8): 86-90.
DOI：

ZHENG Fangping, CUI Xionghua, WANG Hongzhe, et al. ANALYSIS OF BOLT FAILURE FOR HIGH PRESSURE BYPASS VALVE OF ULTRA-SUPERCRITICAL 600 MW UNIT[J]. Thermal Power Generation, 2012, 41(8): 86-90. DOI：

摘要

某电厂超超临界600MW机组的高压旁路阀部分螺栓发生不同程度地损坏

通过宏观检验、合金成分分析、力学性能检验、金相检验及能谱分析等方法

对螺栓失效原因进行分析。结果表明:螺栓失效原因为应力腐蚀开裂

与螺栓原材料固溶处理状态较差、硬度过高及螺纹加工硬化有关。对此

提出了加强备品螺栓检验

控制安装时的预紧力

避免污染腐蚀等预防措施。

Abstract

Through macroscopic inspection

alloy composition analysis

mechanical property detection

metallographic examination

fracture analysis

and energy spectrum analysis etc.

the causes leading to bolt failure of high-pressure bypass valve for an ultra-supercritical 600 MW unit have been analysed.Results show that the failure was due to stress corrosion cracking

which was mainly resulted from bad solid-solution treatment of bolt raw material

too high hardness

and work hardening of threads.For this

some preventive measures

such as strengthening inspection of spare bolts

controlling the pretightening load during installation

and avoiding pollution and corrosion etc.

have been put forward.

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