SEDL / STP / STP656-EB / STP34849S

Detection of Susceptibility of Alloy 26-1S to Intergranular Attack

Sweet, AJ
Supervising engineer, E. I. du Pont Nemours & Company, Engineering Test Center, Wilmigton, Del.

Pages: 36    Published: Jan 1978

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Abstract

Alloy 26-1S, a titanium-stabilized ferritic stainless steel, is of commercial interest because of its good as-welded properties, its resistance to chloride stress-corrosion cracking (SCC), and its low cost relative to other alloys having these characteristics. It has been found that understabilization of 26-1S can lead to sensitization and susceptibility to intergranular attack (IGA) in typical chemical industry solutions and to SCC in hot, chloride-bearing water. To ensure that a given batch of Alloy 26-1S is stabilized properly and resistant to sensitization, specimens from each batch should be tested by appropriate acceptance tests. Two suitable acceptance tests were identified (an etch test and an acid corrosion test), and pass/fail criteria were determined.