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Evaluation of the seabed temperature corrosion and sulphide stress cracking (SSC) resistance of weldable martensitic 13% chromium stainless steel (WMSS)

Dent, Philip Nigel (2016)
M.Phil. thesis, University of Birmingham.

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Abstract

Weldable Martensitic 13% Chromium Stainless Steels (WMSS) are used for mildly sour welded flowlines in the oil and gas industry as an alternative to inhibited carbon steel or lined pipe. Sulphide Stress Cracking (SSC) and electrochemical testing has been undertaken on parent weldable martensitic 13% chromium stainless steel (WMSS) pipe in grade LC80-130S (API 5CT) supplied by Nippon Steel & Sumitomo Metal Corporation (NSSMC). SSC tests have been conducted at the ambient (24 °C) and seabed (5 °C) temperatures in two solutions and in two H2S concentrations with specimens tested in the as received and 600 SiC ground conditions. In addition electrochemical testing has been carried out to correlate the SSC behaviour with the passivity of the material.

The material was found to be more susceptible to SSC at 5 °C compared to ambient temperature and the cracking performance was influenced by the surface condition; with the 600 SiC ground surface having a detrimental effect on the SSC resistance.The electrochemical investigations did not reveal a correlation between the passivity of the material and the increased cracking susceptibility at 5 °C, although differences in the electrochemical behaviour between the as received and 600 SiC ground surfaces were observed.

Type of Work:M.Phil. thesis.
Supervisor(s):Connolly, Brian J. and Fowler, Chris
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:Department of Metallurgy and Materials
Subjects:TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:6871
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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