Laboratory weight-loss corrosion tests in 15% hydrochloric acid (HC1) acidizing solutions and sulfide stress cracking (SSC) tests were performed on three heats of commercially obtained AISI 4140 (UNS G41400) low alloy steel with different levels of inclusion impurities. The 4140 was quenched and tempered to API Spec 5CT Grade P110 properties. The tests indicated that “clean” 4140 has better weight-loss corrosion resistance than 4140 which contained greater amounts of inclusions on a microscopic level. No difference in SSC performance occurred when stressed C-rings were tested at 175°F (70°C) in the NACE TM-01-77 H2S solution modified with CO2.

Subject
Acids, Air pressure, Test methods, Materials, Corrosion losses, Nitrogen, Heat, Corrosion inhibitors, Steel, Corrosion data, Corrosion coupons, Sulfide stress cracking, Inclusions
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1989
Association for Materials Protection and Performance (AMPP)
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