51314-4287-Stress Corrosion Cracking Resistance of UNS S31603 Line Pipe Cladding in Mildly Sour Service under Plastic Strain

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Product Number: 51314-4287-SG

ISBN: 4287 2014 CP

Author: Sytze Huizinga

Publication Date: 2014

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To achieve corrosion resistance in wet gas and condensate production use of UNS S31603 clad carbon steel as line pipe material is one of the options. The success of this application depends on the actual exposure conditions in terms of H2S level temperature pH and salt content but also on the straining the stainless still will undergo. To demonstrate SCC resistance of UNS S31603 cladding material in a mildly sour but relatively elevated temperature application in which a strain based pipeline design was applied a series of tests was performed taking account of both straining that would occur in reeling and in service.Test specimens were taken from shop welds representative of the welding on the pipeline cladding and from actual cladding removed from a test section of clad pipe. Specimens were tested as tensile bars which for the actual cladding were of flat dog bone shape in Cyclic Slow Strain Rate Tests as quoted in ISO 15156 part 3. The results showed that for the exposure conditions simulated in situ strains up to 1% did not cause SCC. Hence the resistance of the clad pipe against SCC was considered demonstrated up to the strain that was assumed in the pipeline design.