Abstract
In the present study, the microstructure, mechanical properties and corrosion resistance of AISI 316L austenitic stainless steel to ASTM A335-P11 low alloy steel dissimilar joints, which are widely employed in the oil and gas industries especially for manufacturing of heat exchangers over 600°C, were investigated. For this purpose, two filler metals of ER309L and ERNiCrMo-3 were selected to be used with GTAW process. The results of microstructural evaluation revealed that the ERNiCrMo-3 weld metal contains dendritic and interdendritic zones, and the ER309L weld metal microstructure includes skeletal ferrites in an austenitic matrix. The maximum impact fracture energy and microhardness values were obtained for the ERNiCrMo-3 weld metal specimens; however, no significant difference was observed between the tension properties. The corrosion test results showed that the ERNiCrMo-3 has a higher corrosion resistance than ER309L. Finally, it was concluded that ERNiCrMo-3 would be a suitable filler metal for joining AISI 316L to A335-P11 for a variety of applications.
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