UNS N08830 is a new Ni-Fe-Cr-Mo-N superaustenitic alloy. It is a non-magnetic single phase, non-precipitation hardenable alloy with exceptional pitting and crevice corrosion resistance, while achieving high strength, excellent toughness and wear resistance in the strain hardened condition. This solid solution strengthened alloy has additions of Cu, W, Co and Mn resulting in improved microstructural stability as compared to other alloys with similar corrosion resistance, allowing for manufacturing productivity in a greater number of sizes and product forms.

This paper will introduce the alloy with a microstructural evaluation as well as corrosion and mechanical test results. Corrosion testing includes requirements to NACE MR0175 / ISO 15156 sour service testing, stress corrosion cracking testing in boiling sodium chloride, and pitting and crevice corrosion in ferric chloride. Mechanical testing included through-thickness analyses to determine a profile of the strength gradient for a strain hardened bar.

Subject
Test methods, Materials, Corrosion resistant alloys, Stainless alloys, Nickel based alloys, Copper alloys, Crevice corrosion, Weight loss, Heat, Pitting, Corrosion resistance, Yield strength, Chloride stress corrosion cracking
Keywords:
Oil & gas, drilling, crevice corrosion, localized corrosion, ferric chloride, ASTM G48
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2017
Association for Materials Protection and Performance (AMPP)
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