Work done to date has been essentially "cause-effect" type research. Different materials, each common to the petroleumproducer industries, have been exposed to one or more corrodents (e.g., the NACE - H2S Solution) to determine the test limit stress/endurance limit under "sour" conditions. The materials which have been examined include low carbon steels, alloy steels, stainless steels and speciality alloys. Variables of interest include composition, hardness, metallurgical condition, strength and the amount of applied tensile stress. Some activity has also been given to the effect of welding, tubular shapes and inhibited test solutions.

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