Prediction of the Remaining Life of High-Temperature/Pressure Reactors Made of Cr-Mo Steels

[+] Author and Article Information
T. Iwadate, Y. Tanaka

Research Laboratory, The Japan Steel Works, Ltd., Muroran, Japan

J. Watanabe

R&D Division, The Japan Steel Works, Ltd., Tokyo, Japan

J. Pressure Vessel Technol 107(3), 230-238 (Aug 01, 1985) (9 pages) doi:10.1115/1.3264441 History: Received May 05, 1985; Revised May 16, 1985; Online November 05, 2009


The Cr-Mo steels widely used for pressure vessels have a potential for temper embrittlement. Therefore, embrittlement during long-term service is expected, and it leads to the decrease of the critical flaw size of brittle fracture and/or to the reduction of the remaining life of a pressure vessel. In this paper, the concept of a remaining life prediction model is presented. And also, experimental data on the temper embrittlement and fracture toughness after long-term exposure and sub-critical crack growth rate, such as creep crack growth rate, were collected, and the data were analyzed for use in the remaining life prediction model. Examples of the remaining life prediction of a 2 1/4 Cr-1Mo steel hydrogenation reactor and a 1 1/4Cr-1/2Mo steel catalytic reforming reactor were calculated from the statistical data base.

Copyright © 1985 by ASME
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