Quality evaluation and performance analysis of WC9 cast steel safety valve for inservice units in a thermal power plant

Abstract

Abstract:

WC9 cast steel is commonly used in components of thermal power plants. Domestic and international standards do not have relevant requirements for their hardness and metallographic structure. It is difficult to evaluate quality of cast steel valves for inservice units only by onsite inspection. Through the specific case study, it expounded how to make quality evaluation and performance analysis for safety valves running for nearly 30,000 hours of inservice units in thermal power plants. Effective method was finally proposed and was of great significance for the safe and reliable operation of the power plant in the future. At the same time, it is also suggested that power plants and suppliers should make requirements on hardness and metallographic organization as a supplement to the standard through consultation, which can provide references for the later inspection during the operation.

Key words:

font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">thermal power plant, WC9 cast steel, safety valve, onfont-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">font-size: 10.5pt, mso-spacerun: 'yes', mso-font-kerning: 1.0000pt">site inspection, quality evaluation, metallographic structure

LI Ge，ZHU Haibao，QIAO Lijie，CHEN Zhuoting.

Quality evaluation and performance analysis of WC9 cast steel safety valve for inservice units in a thermal power plant [J]. Huadian Technology, 2019, 41(9): 72-75.

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Quality evaluation and performance analysis of WC9 cast steel safety valve for inservice units in a thermal power plant

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