Results are reported on: (i) evaluation and comparison of threshold hydrogen concentration for hydrogen induced cracking (HIC) in linepipe steels; (ii) threshold pH for steels at which no cracking was observed; (iii) observation of cracking by an ultrasonic C-scan technique; and (iv) quantitative characterization of non-metallic inclusion populations in linepipe steels.

The results are discussed in terms of cracking sensitivity, HIC susceptibility and effects of non-metallic inclusions in the linepipe steels on HIC.

Subject
Hydrogen induced cracking, Hydrogen concentration, Steel coupons, Linepipe, Diffusible hydrogen, Metallography, Acidity, Metallographic examination, Steel, Hydrophobic interaction chromatography, Hydrogen, Inclusions, Samples
Keywords:
HIC, hydrogen sulphide, pipeline, nonmetallic inclusions, materials selection
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1998
GOV
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