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08182 Beneficial Effects of Tantalum in Ni-Cr-Mo-Ta Alloy UNS N06210

Picture for 08182 Beneficial Effects of Tantalum in Ni-Cr-Mo-Ta Alloy UNS N06210
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Product Number: 51300-08182-SG
ISBN: 08182 2008 CP
Author: Katsuo Sugahara
Publication Date: 2008
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Alloy T21 (UNS N06210), which comprises 19% chromium, 19% molybdenum, 1.8% tantalum, and the remaining composition of nickel, shows excellent corrosion resistance against pitting and crevice corrosion attack as compared to other commercial Ni-Cr-Mo alloys such as alloys C-276, 22, 59, and 686. Alloy T21 has a high pitting resistance equivalent (PRE) number, which is calculated from the compositions of chromium and molybdenum: this alloy exhibits excellent localized corrosion resistance, which exceeds its PRE number. The addition of a small amount of tantalum to an experimental Ni-Cr-Mo alloy has remarkably improved its corrosion resistance against pitting and crevice corrosion attack. Furthermore, a butt weld of alloy T21 also exhibits excellent pitting resistance as compared to those of other commercial Ni-Cr-Mo alloys. Butt welds of experimental Ni-Cr-Mo alloys that contain tantalum show superior pitting resistance as compared to those of Ni-Cr-Mo alloys that do not contain tantalum. The beneficial effects of tantalum are in a way that it improves the localized corrosion resistance of Ni-Cr-Mo alloys and the welds produced using the alloys.
Alloy T21 (UNS N06210), which comprises 19% chromium, 19% molybdenum, 1.8% tantalum, and the remaining composition of nickel, shows excellent corrosion resistance against pitting and crevice corrosion attack as compared to other commercial Ni-Cr-Mo alloys such as alloys C-276, 22, 59, and 686. Alloy T21 has a high pitting resistance equivalent (PRE) number, which is calculated from the compositions of chromium and molybdenum: this alloy exhibits excellent localized corrosion resistance, which exceeds its PRE number. The addition of a small amount of tantalum to an experimental Ni-Cr-Mo alloy has remarkably improved its corrosion resistance against pitting and crevice corrosion attack. Furthermore, a butt weld of alloy T21 also exhibits excellent pitting resistance as compared to those of other commercial Ni-Cr-Mo alloys. Butt welds of experimental Ni-Cr-Mo alloys that contain tantalum show superior pitting resistance as compared to those of Ni-Cr-Mo alloys that do not contain tantalum. The beneficial effects of tantalum are in a way that it improves the localized corrosion resistance of Ni-Cr-Mo alloys and the welds produced using the alloys.
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