Abstract
Out-of-reactor capsule experiments have extended previous studies on the attack of 316 steel by tellurium: oxygen: caesium corrodents. It has been shown that intergranular attack can be obtained as low as 350–450°C with a caesium: tellurium mole ratio of 1:2 in the presence of a Mo/MoO 2 oxygen source. High tensile stresses enhanced the penetration. The view is expressed that a fine balance has to be established between the aggressiveness of the corrodent and the reactivity of the metal to obtain the intergranular attack. This balance can be influenced by oxygen potential, tellurium potential, temperature, metal straining and sensitisation of the steel.
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