Stainless steel butterfly valves in corrosion phenomena appeared in the process of use. Through the microstructure analysis, dyeing and try face face, heat treatment, such as SEM test analysis, found the key factors for material corrosion because of materials along the grain boundary carbide precipitation form poor chrome area, causing rust stainless steel butterfly Industrial Valves. Stainless steel butterfly Industrial Valves corrosion solution 1 test method for Shanghai hong feng Industrial Valves resources: sampling for chemical analysis ( Determine whether accord with a standard to ask) Heat treatment process, microstructure examination and test and SEM analysis. The experimental results and analysis of 2. 1 the chemical composition of chemical composition analysis results and standard components. 2. 2 metallographic analysis from appearing on the corrosion phenomenon of butterfly valve for the metallographic sample, after grinding and polishing, corrosion with ferric chloride aqueous solution, the Neophot - 32 show badge mirror on metallographic observation analysis, the microstructure of austenite and another kind of precipitates. In theory after normal heat treatment of austenitic stainless steel, austenitic organization should be uniform. In the organization of the other exudates what organization, there are two kinds of judgment: one is the sigma phase, the other is a carbide. Sigma facies of the formation of carbides, but has a common characteristic, that is caused by austenitic stainless steel on the sensitivity of intergranular corrosion.
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