Abstract
The microstructure and chemical composition of a vortex steam flowmeter made of 304 austenitic stainless steel were investigated based on the optical microscope and scanning electron microscope analysis. The results show that the microstructures of flange and weld between the flange and main channel are austenite. The chemical composition analysis shows that the contents of Ni and Cr of flange and weld between the flange and main channel do not meet the relevent standard.
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