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Cold Work Qualification Of UNS N08935 For Use In Chloride And Sour Environment

Cold Work Qualification of UNS N08935 for Use in Chloride and Sour environment
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UNS N08935 is a new versatile super austenitic alloy with extreme pitting resistance as indicated by its pitting resistance equivalent number (PREN) of 52. It can be used in a broader temperature range than superduplex and hyperduplex stainless steels, offers good weldability and is more cost-effective than Nickel-based materials which make the grade a good candidate for O&G applications, refineries, and chemical industries.1,2

Product Number: 51322-18080-SG
Author: Karen Picker, Luiza Esteves, Marcelo Senatore
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings
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Twisting and U-bending of heat exchanger tubing are common practices employed to enhance operating conditions and plant design. Both methods result in cold plastic deformation which can have an impact on the mechanical and corrosion properties of the material. This paper is focused on the effect of the cold plastic deformation on austenitic stainless steel (UNS N08935) and the necessity of subsequent solution annealing. The material qualification was evaluated by mechanical and corrosion properties using results of hardness, pitting corrosion resistance (ASTM G48 Method C), and stress corrosion cracking in sour conditions (NACE TM0177). The results will be able to demonstrate if the cold work deformation on alloy 35Mo will affect the use of this alloy in heat exchangers applications in the refinery industry in the coldworked condition without the need of re-solution annealing.

Twisting and U-bending of heat exchanger tubing are common practices employed to enhance operating conditions and plant design. Both methods result in cold plastic deformation which can have an impact on the mechanical and corrosion properties of the material. This paper is focused on the effect of the cold plastic deformation on austenitic stainless steel (UNS N08935) and the necessity of subsequent solution annealing. The material qualification was evaluated by mechanical and corrosion properties using results of hardness, pitting corrosion resistance (ASTM G48 Method C), and stress corrosion cracking in sour conditions (NACE TM0177). The results will be able to demonstrate if the cold work deformation on alloy 35Mo will affect the use of this alloy in heat exchangers applications in the refinery industry in the coldworked condition without the need of re-solution annealing.

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