Critical Crack Sizes of CNG Cylinder Steel in  H2S Environment

J Chin Soc Corr Pro

2005, Vol. 25

Issue (5): 285-290 DOI:

Research Report

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Critical Crack Sizes of CNG Cylinder Steel in H2S Environment

;;Xiaoping Shan;Bangxian Li

北京工业大学机电学院

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Abstract Three groups of specimens of CNG cylinder steels,4130X and 30CrMo,were tested in dense and moderate H2S solutions.By using modified WOL specimens loaded with bolts,we obtained KISCC in H2S environment,as well as K1C in air.The critical crack sizes of different materials in H2S environment were thus figured out,and the curves with working pressures and equivalent stress to critical crack size were plotted.The results show thatK1C of those specimens were all in a high level,thus with good fracture toughness in normal nvironment.However,KISCC in H2S environment ranged from 20% to 40% of K1C.For two groups of specimens made of CNG steel 4130X but from different vendors,their KISCC are 30% difference and their critical crack sizes are 80% difference.

Key words: stress intensity factor critical crack size H2S environment stress corrosion cracking

Received: 08 May 2004

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Xiaoping Shan; Bangxian Li. Critical Crack Sizes of CNG Cylinder Steel in H2S Environment. J Chin Soc Corr Pro, 2005, 25(5): 285-290 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2005/V25/I5/285

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