Improved API X80 Heavy-Gauge Large-Diameter Pipe Mechanical Property Stability Through Cost-Effective Optimized Niobium Metallurgy Performance
(Room 402)
16 May 22
2:30 PM
-
3:00 PM
Today’s market for API pipeline steels requires higher strength and fracture toughness performance in heavier gauges and larger pipe diameters. Meeting basic average mechanical properties of strength, Charpy V-notch test and drop weight tear test performance has been achieved by many with newer powerful plate mills and cooling systems. However, stability/standard deviations of plate/pipe strength and toughness along with pipe seam/girth weld toughness continues to be challenging. Nanjing Iron and Steel successfully improved base metal plate strength and toughness stability that translated into improved pipe strength and toughness stability including pipe seam/girth welds with an optimum 0.075% niobium content and plate processing for the application.