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08500 The Influence of Weld Heat-Affected Zone on Stress Corrosion Cracking of Pipeline Steel in Near-Neutral pH Environment

Picture for 08500 The Influence of Weld Heat-Affected Zone on Stress Corrosion Cracking of Pipeline Steel in Nea
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Product Number: 51300-08500-SG
ISBN: 08500 2008 CP
Author: B. Fang, E. Han, J. Wang, W. Ke, R. Eadie, W. Zheng, M. Elboujdaini, and W. Revie
Publication Date: 2008
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Colonies of stress corrosion cracks are often seen around weld heat-affected zones (HAZs) in pipelines that are operating in the field in contact with near-neutral pH (NNPH) environment. Research on stress corrosion cracking (SCC) of welded line pipe steel can contribute knowledge that is important in establishing pipeline integrity. In the project reported in this paper, samples that had been machined from a large-diameter welded gas transmission pipe were subjected to slow strain rate testing (SSRT) at different strain rates in a soil solution and in NS4 solution, both purged with 5% CO2/balance N2 gas mixture. There were many more quasi-cleavage areas on the fracture surfaces of the weld HAZ specimens than on the fracture surfaces of the base metal. The increased SCC susceptibility of the weld HAZ samples compared to the base steel was attributed to the coarse-grained, non-uniform microstructure of the HAZ samples as well as the higher residual stress. SCC propensity increased with decreasing loading rate and with more negative potentials. SCC initiation was associated with pitting corrosion.
Colonies of stress corrosion cracks are often seen around weld heat-affected zones (HAZs) in pipelines that are operating in the field in contact with near-neutral pH (NNPH) environment. Research on stress corrosion cracking (SCC) of welded line pipe steel can contribute knowledge that is important in establishing pipeline integrity. In the project reported in this paper, samples that had been machined from a large-diameter welded gas transmission pipe were subjected to slow strain rate testing (SSRT) at different strain rates in a soil solution and in NS4 solution, both purged with 5% CO2/balance N2 gas mixture. There were many more quasi-cleavage areas on the fracture surfaces of the weld HAZ specimens than on the fracture surfaces of the base metal. The increased SCC susceptibility of the weld HAZ samples compared to the base steel was attributed to the coarse-grained, non-uniform microstructure of the HAZ samples as well as the higher residual stress. SCC propensity increased with decreasing loading rate and with more negative potentials. SCC initiation was associated with pitting corrosion.
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10300 Effect of CO2 on Near-Neutral Ph Stress Corrosion Cracking Initiation of Pipeline Steel

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06497 EFFECT OF WELDING RELATED MICROSTRUCTURE ON STRESS CORROSION CRACKING SUSCEPTIBILITY IN CAUSTIC SOLUTIONS

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Stress Corrosion Cracking in the weld and heat affected zones of Duplex Stainless Steels has been experienced in different industries.  In this paper, an attempt has been made to study the various aspects of this type of corrosion, brought about by welding.  Results show duplex stainless steel base metal is also susceptible.
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11105 Sulfide Stress Cracking Susceptibility of Local Hard Areas in Carbon Steel Weld Heat Affected

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