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Four environmental cracking problems experienced by the petroleum industry are described. These problems warrant the use of laboratory environmental cracking tests as an aid to materials selection. Test methods used at the Amoco Research Center include tensile-type (static load and slow strain rate), U-bend, bent-beam, and fracture mechanics techniques. Choice of method is shown to depend upon service conditions, alloy system, and product form. Typical test results for carbon and low-alloy steels, stainless steels, and nickel-base alloys are presented. In particular, methods of utilizing test results to provide specific materials selections are described.
stress corrosion, hydrogen embrittlement, sulfide stress cracking, polythionic acid, test methods
Ciaraldi, Stephen W.
Corrosion specialist, Research Department, Amoco Corp., Amoco Research Center, Naperville, IL