Products tagged with 'back purging gas'

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Effect of Oxygen in Back Purging Gas on Corrosion Resistance of Super Duplex Welded Joints

Product Number: 51324-21111-SG

Author: Tatiana C. Almeida; Rogaciano M. Moreira; Merlin C. E. Bandeira; Oscar R. Mattos; Flávia M. F. Guedes

Publication Date: 2024

$40.00

Several offshore pipelines in Pre-salt fields, Brazil, are made of Super Duplex stainless steel. When welded, in general, these materials present a decrease in its corrosion resistance. Welding procedures, materials properties, surface conditions and post-weld treatment have influence on the resistance to local corrosion Although there is a strict control regarding the contamination of back purging gas with oxygen, sometimes, this control may fail and the oxygen content may exceed this limit. Understanding if the pitting corrosion resistance is affected by a higher oxygen level and how a post-weld surface treatment by pickling and passivation can improve the corrosion resistance is important in situations where the control of oxygen content is limited. In the present study, specimens welded with back purging gas containing 100 ppm and 200 ppm of oxygen and without back purging gas were investigated through ASTM (1) G48- A, and through ASTM G48 method E6. The pitting resistance was improved after post-weld surface treatment for super duplex stainless steel.

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Effect of oxygen in back purging gas on localized corrosion resistance of duplex welded joints with and without post-weld surface treatment

Product Number: 51323-19445-SG

Author: Tatiana C. Almeida, Rogaciano M. Moreira, Merlin C. E. Bandeira, Susana L. Díaz, Drielly L. Souza, Brenda C. S. Cardozo, Rafaela A. Posse, Oscar R. Mattos, Flávia M. F. Guedes, Ilson P. Baptista, Petronio Zumpano Junior, Ricardo R. Marinho, Aline L.S. Gomes, Marcelo F. Motta, Hélio C. Miranda

Publication Date: 2023

$20.00

Duplex stainless steel is widely used in Brazilian offshore pipelines since the pre-salt environment is under high corrosion scenario. Welding processes are often used in applications involving this steel. However, in general, welding imposes a reduction in the corrosion resistance of stainless steels.

Products tagged with 'back purging gas'

Effect of Oxygen in Back Purging Gas on Corrosion Resistance of Super Duplex Welded Joints

Effect of oxygen in back purging gas on localized corrosion resistance of duplex welded joints with and without post-weld surface treatment

Association for Materials Protection and Performance