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SSC/SCC

Stress corrosion cracking (SCC) is the unexpected failure of normally ductile metals subjected to a tensile stress in a corrosive environment. SCC is highly chemically specific in that certain alloys are likely to undergo SCC only when exposed to certain corrosive environments. Sulfide stress cracking (SSC) is a form of hydrogen embrittlement which is a cathodic cracking mechanism. Susceptible alloys, especially steels, react with hydrogen sulfide, forming metal sulfides and atomic hydrogen, which causes SSC. This section provides access to reports that present test results and evaluate the resistance to SSC/SCC of various materials when exposed to different corrosive environments.


 
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Stress Corrosion Cracking Tests for Carbon Steels in Amine Environments
Several poly-amine blends were used to evaluate SCC of welded ASTM A516 Grade 70 carbon steel specimens tested at 295 F at 17 psig. Blend sample numbers 1,2 and 3 did not produce stress corrosion cracking under the conditions tested, where as blend no. 4 produced mild SCC.
 
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        This report is available for download to corporate users only at this time and will be soon made available for individual purchase.
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SSC of Drill Collar Alloys
The stress corrosion cracking resistance of alloys SCF-19 and 15-15LC was compared in simulated drilling environments using low strain rate tests, NACE tensile tests and autoclave exposures of DCB and bent beam specimens. Alloy 15-15LC was extremely susceptible to stress corrosion cracking in chloride solutions both with and without H2S. Alloy SCF-19 showed no tendency to stress corrosion crack in any of the environments tested.
 
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        This report is available for download to corporate users only at this time and will be soon made available for individual purchase.
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Carburization Testing of Metals
A carburization test and evaluation was performed on selected alloy and coated coupons. Alloys MA 956, HA 214, and the Alonized coupons were screened as the best materials of construction for the given conditions.
 
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SSC Studies of SYNGAS and Sour methanol heat exchanger materials
Sulfide stress cracking tests were conducted on welded nickel steels, carbon steels and stainless steel in NACE solution, simulated syngas and simulated sour methanol environments. All nickel steels and carbon steels failed the NACE test at low stress levels; the stainless steels showed no failures. In the simulated syngas and sour methanol environments, only the material from the failed heat exchanger showed environmental cracking during the month long exposure. The sour methanol environment ap...
 
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        This report is available for download to corporate users only at this time and will be soon made available for individual purchase.
 
     
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