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《GRYOGENICS》 1994-03
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Analyses of Fatigue for Globose Tank of Ethylene of 9Ni Steels

XU Lie;LIYan  
The most common fatigue designing curves are provided in this papet.These Sa-Nf curves whose Nt are below 106 include those of the two sorts of carbon steels whose tensile strength are below 552MPa or of ranges from 793 to 896MPa,high intense steels and low alloy steels.The detcrmi-ning of the alternating stress range and the times of the designing cycle-are also provided.To those cryogenic vessels whose σb are less than 553MPa,if the total of the designcd times of pressure cycle,the times of pressure cycle when pressure is greatcr than the designed value,the valid changing times of temperature diffesence between the adjacent points at connected pipes and the cycling times when the teniperature is greater than a value to those workpieces welded with different materials is greater than 1000 times for the whole or 400 times for the part,the analyses of fatigue can be omi-tted.
【CateGory Index】: TQ053.2
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