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