SEDL / STP / STP665-EB / STP38129S

Multispecimen Test Facility for High Temperature, High Pressure Slow Strain-Rate Testing

Lyle, FF
Senior corrosion engineer and manager of mechanical properties section, Southwest Research Institute, San Antonio, Tex.

Norris, EB
Senior corrosion engineer and manager of mechanical properties section, Southwest Research Institute, San Antonio, Tex.

Pages: 11    Published: Jan 1979

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Abstract

This paper describes a slow strain-rate test facility in which 6 tension specimens may be tested simultaneously and load-versus-displacement curves for each specimen may be recorded. The facility is designed to operate at a maximum temperature of 500 K (450 °F) and a maximum pressure of 28 MPa (4 ksi). Constant crosshead displacement rates ranging from 2.5 × 10^-6 to 2.5 × 10¹ cm/s (10^-6 to 10¹ in./s) may be obtained. Studies of hydrogen sulfide (H²S)-induced stress corrosion cracking (SCC) of low alloy steels exposed to simulated sour gas well environments (hydrogen sulfide-carbon dioxide-water (H²S-CO²-H²O)) are described. Use of the technique to determine H²S-induced SCC susceptibility of various steels as a function of temperature is shown.