Cryogenic Charpy Impact Test based on GTAW Method of
AISI 304 Stainless Steel for LNG Pipeline

doi:2014.32.3.303

J Weld Join > Volume 32(3); 2014 > Article

Research Paper

Journal of Welding and Joining 2014;32(3):303-308.
DOI: https://doi.org/10.5781/JWJ.2014.32.3.89 Published online June 30, 2014.

Cryogenic Charpy Impact Test based on GTAW Method of AISI 304 Stainless Steel for LNG Pipeline

Abstract

AISI 304 austenitic stainless steel is widely used for LNG pipes for LNG transmission thanks to its good metallurgical and mechanical properties. In the present research, impact toughness of a gas tungsten arc welded AISI 304 stainless steel pipe was evaluated between room and liquid nitrogen (-196˚C) test temperatures. In addition, a comparative study was made of the fracture behavior of FCC crystal structured stainless steel weldments and BCC crystal structured mild steels(A-grade and SS400). The results showed a slight decrease in the impact energy of the AISI 304 base metal, heat affected zone(HAZ), and welded zone with decreasing test temperature. In addition, the welded metal has the highest absorbed impact energy, followed by HAZ and the base metal.

Key Words: Charpy V-notch impact test, Welded LNG pipe, AISI 304 austenitic stainless steel