Abstract
Discusses variables in a refinery which affect selection of alloy materials to be used in construction of units. Gives examples of failures caused by lack of evaluation of alloys in new processes before fabrication of units. Presents reasons a laboratory and pilot plant corrosion testing program should be established and information on effects of temperature, concentration ^ and time that should be obtained from this program. Also discusses metallurgical considerations which should be made in selection of alloys: weld metal structure, grain boundary precipitation effects in stainless steels and in other alloys, problems in clad vessels, stress corrosion cracking in alloys and effects of hydrogen on alloys. Emphasizes the need to maintain effective records of tests, chemical composition and heat treatment history of each specimen. Briefly discusses need to continue alloy evaluation by corrosion monitoring in process equipment. 6.5
