Cracks was found in type 347 stainless steel internal attachment welds of a reactor for a high temperature, and high pressure hydrogen service. One of the possible causes of cracking is low cycle fatigue cracking induced by repetition of thermal stress to embrittled weld metal. Type 347 weld metal loses its ductility by presence of sigma phase and hydrogen.


C.H. Samans, Corrosion. 20 (1984) 265.

J. Watanabe et. al., Presented at The International Joint Pressure Vessels & Piping and Petroleum Mechanical Engineering Conference, Mexico City (1976) 19-24.

C.T. Sawyer, Information Distributed to all Refining Managers in the United States and Canada, In-Service Embrittlement of Low-Alloy Chrome-Moly Steel, API, Division of Refining, 1974.

J. Watanabe et. al, Presented at NACE Conference Corrosion/76, Houston, Texas, March 22-26 (1996).

Pressure Vessel Research Committee, Long Range Plan for Pressure Vessel Research-Fourth Edition, WRC Bulletin No. 209 (1975) p. 6

Y. Yoshino, J. Watanabe and R. Chiba, Presented at International Conference on the Effect of Hydrogen Behavior of Materials, Jackson, Wyoming, 1975.



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.