Carburization Testing of Metals
A carburization test and evaluation was performed on selected alloy and coated coupons. The purpose of this test was to screen and compare coupons for their relative resistance to two (2) high temperature carburizing atmospheres.

SSC resistance of valve materials in High Pressure H₂S/CO₂ Environments
A series of test were conducted to evaluate the sulfide stresscracking (SSC) resistance of candidate low alloy steels forapplication in valve components. Fracture mechanics test methodswere combined with autoclave exposures to develop information onthe behavior of these materials in high pressure simulated fieldenvironments containing H₂S, CO₂ and brine.

Evaluation of Zinc Silicide Coating for SCC Resistance of AISI 304 Stainless Steel
Presented herein are the results of stress corrosion cracking (SCC) tests performed to evaluate the effect of silicide coatings on the SCC resistance of AISI 304 stainless steel in an elevated temperature chloride-continuing solution.

SSC of Drill Collar Alloys
Austenitic chromium-manganese stainless steels are widely used for non-magnetic drill collars during MWD (measurement while drilling) operations. Many such drill collars must eventually be retired due to stress corrosion cracking. A new alloy, SCF-19, with improved environmental cracking resistance, was tested to compare the stress corrosion cracking resistance of SCF-19 to that of 15-15LC, a common chromium-manganese stainless steel widely used for non-magnetic drill collars.

SCC Tests of 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.

SCC Resistance of Alloy 825
Slow Strain Rate (SSR) tests were conducted to evaluate Alloy 825 for stress corrosion cracking resistance in an H₂S/Brine environment at elevated temperatures.

Evaluation of CRAs for determining resistance to Corrosion & Cracking
Presented herein are the results of the Task 2 Corrosion Resistant Alloy (CRA) Evaluation. These tests were conducted to determine the corrosion and stress corrosion cracking behavior of selected high alloy materials under conditions simulating those found in the Thamama gas.

SSC Studies of SYNGAS 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 appeared to be somewhat more severe than the syngas environment, but both simulated service environments were considerably less severe than the NACE solution with regard to the promotion of sulfide stress cracking.