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99430 INVESTIGATION OF THE SUSCEPTIBILITY OF CONVENTIONAL ASTM A5 16-70 PRESSURE VESSEL STEEL TO HIC AND SOHIC IN H2S-CONTAINING DGA SOLUTIONS

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Product Number: 51300-99430-SG
ISBN: 99430 1999 CP
Author: M. A. Al-Anezi, G. S. Frankel, A. K. Agrawal
Industry: Chemical Inhibitors
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Hydrogen Induced Cracking (HIC) and Stress Oriented Hydrogen Induced Cracking (SOHIC) tests were conducted on a conventional ASTM A516-70 pressure vessel steel exposed to H2S-containing diglycolamine (DGA) gas-sweetening environments. Baseline HIC and SOHIC tests were conducted in NACE TM-0284-A-96 solution. For the SOHIC tests, fburpoint double beam specimens were stressed to 60%, 80% or 100% of the yield strength of the steel in order to study the effect of applied stress. Test conditions included solutions containing 70 wt. % DGA and 500 ppm H2S to 0.45 or higher mole-H2S/mole-DGA and temperatures of 25, 45 and 80°C. Corrosion rates of the steel were calculated from weight loss of the HIC specimens in order to compare the severity of the test environment with the actual service environment. Cracks were characterized in terms of crack length ratio (CLR), crack thickness ratio (CTR) and crack sensitivity ratio (CSR). Results indicate that conventional ASTM A5 16-70 pressure vessel steel is not susceptible to HIC or SOHIC in various H2S containing DGA solutions at the temperatures studied. Keywords: hydrogen sulfide, hydrogen induced cracking, stress oriented hydrogen induced cracking, diglycolamine, pressure vessel steel
Hydrogen Induced Cracking (HIC) and Stress Oriented Hydrogen Induced Cracking (SOHIC) tests were conducted on a conventional ASTM A516-70 pressure vessel steel exposed to H2S-containing diglycolamine (DGA) gas-sweetening environments. Baseline HIC and SOHIC tests were conducted in NACE TM-0284-A-96 solution. For the SOHIC tests, fburpoint double beam specimens were stressed to 60%, 80% or 100% of the yield strength of the steel in order to study the effect of applied stress. Test conditions included solutions containing 70 wt. % DGA and 500 ppm H2S to 0.45 or higher mole-H2S/mole-DGA and temperatures of 25, 45 and 80°C. Corrosion rates of the steel were calculated from weight loss of the HIC specimens in order to compare the severity of the test environment with the actual service environment. Cracks were characterized in terms of crack length ratio (CLR), crack thickness ratio (CTR) and crack sensitivity ratio (CSR). Results indicate that conventional ASTM A5 16-70 pressure vessel steel is not susceptible to HIC or SOHIC in various H2S containing DGA solutions at the temperatures studied. Keywords: hydrogen sulfide, hydrogen induced cracking, stress oriented hydrogen induced cracking, diglycolamine, pressure vessel steel
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