2021 Nashville AISTech

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Microstructure and Property Investigations for Heavy-Gauge Line Pipe Development (Room Virtual)

Enhancing low-temperature toughness in high-strength (X70, X80) line pipe steels with heavy gauges (≥0.75 inch) requires an understanding of how alloying and processing generates microstructures with beneficial features. To this end, recent lab-scale experiments have examined specific aspects in processing such as austenite grain size and runout table transformation behavior. Concurrently, pilot-scale trials investigating differing rolling schedules generated material to perform mechanical testing that included drop weight tear testing. Characterizations for these experiments were performed using various methods including scanning electron microscopy, electron backscatter diffraction and transmission electron microscopy. The lab-scale and pilot-scale results have provided significant insight into the alloy-process-microstructure-property relationships.