Abstract
The valve cover of a gray cast iron drain valve, used by a chemical company, cracked during its operation. The cracking reasons of the valve cover were investigated by fracture appearance observation of the valve cover, metallographic observation, SEM observation, chemical composition analysis of the corrosion products, finite element analysis of the valve cover by ABAQUS and tensile tests and impact tests of the cover sample at normal temperature and-12°C. After these investigation jobs, it can be concluded that there was no any significant cast defect or original defect in the fracture of the valve cover, the stress was much lower than the strength of valve cover material, and the cracking of the valve cover was caused by the expansion of the ice which was changed from the seeper between the valve cover and valve body when the weather temperature was lower than-12°C. At the end of this article, some proposals were put forward to the company in order to avoid similar accidents.
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