A Review of Factors Affecting the Structural Integrity of Weldments in Heavy Wall Reactor Vessels

Author: McGrath J. T.   Chandel R. S.   Orr R. F.   Gianetto J. A.  

Publisher: Maney Publishing

ISSN: 0008-4433

Source: Canadian Metallurgical Quarterly, Vol.28, Iss.1, 1989-01, pp. : 75-83

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Abstract

The metallurgical structures which control the resistance to embrittlement of weld regions of heavy-wall hydrotreatment reactor vessels are described in this paper. Specifically, the control of notch toughness properties of heavy-section submerged-arc narrow-gap welds in 2.25 Cr-1 Mo steel after post-weld heat treatment and temper embrittlement exposure are discussed. Data are also given on the factors controlling the fracture resistance of SA516 Gr.70 heavy section welds for more conventional pressure vessels operating in a less harsh environment. Methods for controlling the metallurgical structure and the local buildup of hydrogen at the weld overlay/base metal interface are discussed for the problem of hydrogen-related disbonding of the stainless steel overlay lining in reactor vessels.