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To resolve discrepancies between results of four-point bend tests and uniaxial constant load tests on UNS S31603 in sour environments, a series of tests was conducted to compare the two test methodologies.
In order to resolve reported discrepancies between the results of four-point bend tests and uniaxial constant load tests on UNS S31603 in sour environments, a series of systematic tests has been conducted to compare the two test methodologies under carefully controlled conditions. It was demonstrated conclusively that tests performed in uniaxial tension at constant load are inherently more severe than tests performed in constant displacement four-point bending due to the presence of low-temperature creep in the former. The enhanced susceptibility to stress corrosion cracking is attributed to the presence of additional tensile plastic strain in specimens that have undergone low-temperature creep. Tests performed in uniaxial tension were also found to be more severe than those performed in four-point bend even when dynamic strain was eliminated by performing them at constant displacement. A key observation is that no load relaxation due to low-temperature creep occurs during the four-point test. The results emphasize the need to take into consideration factors such as the level of tensile plastic strain in service when selecting the appropriate test method for a given application.
Key words: stress corrosion cracking, corrosion resistant alloys, hydrogen sulfide, four-point bend testing, uniaxial tensile testing
High strength UNS S31010 with 140 ksi MYS has been produced by warm work hardening and cold work hardening. The characterization of high strength alloy with respect to corrosion resistance is discussed in this paper.
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A series of NACE TM0177 Tensile Test Method A tests were conducted on various commercially available chromium-manganese austenitic stainless steels as well as 17-4PH in the 110ksi-to-130ksi yield strength range (34 - 35 HRC max).
The focus of this paper is the welding metallurgy and weld metal properties of N07022 alloy. Evaluation of the N07022 weld metal microstructure will be discussed. Sour gas testing of N07022 weld overlay material will be highlighted. Mechanical properties will be presented.