December 2010 Vol. 237 No. 12

Features

Low Temperature Ductility And Ductile Crack Arrest Properties Of High Strength Low Alloy Steel

The emergence of micro-alloyed, high strength steel in pipeline applications has opened opportunities for more specialized studies of low-temperature ductility loss and the possibility of crack development. We will discuss the subject further in still more stringent design conditions that challenge engineers and operators. Carbon steel (BCC structure) exhibits excellent ductility at temperatures above the freezing point of water. These materials progressively lose their ductility at lower temperature. This gives rise to cleavage or the inter-granular mode of cracking. With the clean steel-making techniques commonly practiced today the average steel exhibits excellent ductility d

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