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If Types 304 and 316 steels with improved elevated temperature strength existed, equipment manufacturers could design to higher stresses, thereby reducing the weight and consequently the cost of fabricated equipment. The addition of nitrogen appears to be one means of improving the strength of Types 304 and 316 steels with little additional cost. Although appreciable work has been done, most of it over a limited temperature range, the effect of nitrogen on the creep and creep-rupture properties of Types 304 and 316 steels has not been quantitatively established. This paper reviews studies to determine quantitatively the effect of nitrogen on the (a) creep and creep-rupture properties of Types 304 and 316 steels within AISI composition limits over a large temperature range and (b) toughness of Types 304 and 316 steels after long time exposures at elevated temperatures.
nitrogen, creep rate, creep rupture strength, creep strength, energy absorption, stainless steels, toughness
Research engineer, United States Steel Corp., Applied Research Laboratory, Monroeville, Pa.