Abstract
Abstract Sulfide corrosion cracking of linepipe steel was studied from metallurgical and environmental standpoints using laboratory and full size tests. Sulfide corrosion cracking can be classified into hydrogen induced cracking (HIC) and sulfide stress cracking (SSC). HIC initiates at an elongated inclusion and tends to propagate along microstructural inhomogeneity. The addition of copper was effective in preventing HIC in a relatively mild BP solution, due to the formation of a protective film, but was ineffective in a NACE solution. Calcium treatment of desulfurized steel was effective in preventing HIC initiation. Optimization of the manganese content for controlled rolled plate, and the quenching and tempering process were effective in controlling HIC propagation in a NACE solution. SSC in linepipe steel was closely related with HIC. Measures for HIC were also effective in increasing SSC resistance. Girth welded joints were the most susceptible since SSC occurred at the hardest point in the heat affe...
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