Comparison between TTS diagrams obtained by Huey and modified Strauss standard tests for AISI 304 stainless steel

This work presents a comparison of Temperature-Time-Sensitization TTS diagrams obtained by Huey and modified Strauss standard, for detecting susceptibility to intergranular attack. The difference between these tests is the use of a strong or a slighty smooth oxidizing electrolite. The diagrams obtained are different and if a sample tested by modified Strauss is sensitised, then it will be sensitised in the Huey test, but the contrary is not always true. This difference is because a sensitised sample has to have a continuous band lacking in chromiun along the grain boundary in order to be sensitised in the modified Strauss test. This condition is not necessary in the Huey test.