Effects of Straining, Aging, and Stress-Relieving on Mechanical Properties of Steels for Arctic Service

[+] Author and Article Information
R. J. Jesseman, R. C. Smith

Armco Steel Corporation, Middletown, Ohio

J. Eng. Ind 97(2), 408-416 (May 01, 1975) (9 pages) doi:10.1115/1.3438600 History: Received June 05, 1974; Online July 15, 2010


The effects of straining, straining + aging, and straining + aging + stress-relieving on tensile and Charpy V-notch impact properties were determined for several candidate arctic pipe and fitting steels. Possible compositional and processing means to maintain high as-rolled energy levels in strained + aged pipe are discussed. Heat treatment of 787 and Mn-Mo-Cb, as would be necessary in fittings, increased toughness to the level that degradation due to straining + aging was readily accommodated even at −80°F (−62°C) test temperatures. For fittings designed to −20°F (−29°C) or higher service temperatures, Armco VNT-QT with restricted carbon content and sulfide shape control provided adequate toughness in the strained + aged condition. After stress-relieving, the impact properties improved enough to allow use of this grade at −80°F (−62°C).

Copyright © 1975 by ASME
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