Duplex stainless steels have been widely used for flowlines carrying oil and gas, with more than 845km now in service. Successful application requires selection of the correct steel grade, use of the material in the correct heat treatment condition, attention to specific procedures when welding, correct design of the cathodic protection system and control during the commissioning period. This paper details correct practice in all these areas, providing sound guidelines for the successful application of duplex stainless steels for flowlines.
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