On the weldability and corrosion resistance of alloy UNS N08827 – a further improvement of alloy UNS N08825

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Recently, the nickel-based alloy UNS N08827, commercially known as VDM ® Alloy 825 CTP(3), has been presented to the oil and gas industry as an alloy that has been developed to fill in the existing gap between both UNS N08825 and UNS N06625 in terms of localized corrosion resistance. It is a solid-solution nickel alloy with chemical composition similar to UNS N08825, except for its doubled molybdenum content and the no addition of titanium.

Product Number: 51323-18847-SG

Author: Julia Botinha, Martin Wolf, Helena Alves

Publication Date: 2023

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As described in recently published papers, the nickel-based alloy UNS(1) N08827, commercially known as alloy 825 CTP, has been developed to fill in the existing gap between alloys UNS N08825 and UNS N06625. It is an austenitic nickel based alloy composed mostly by nickel, iron and chromium with additions of molybdenum and copper. In comparison to UNS N08825, UNS N08827 has doubled molybdenum content, which grants to this alloy a higher localized corrosion resistance, as well as no titanium additions, which significantly improves the weldability. In comparison to UNS N06625, UNS N08827 has a lower nickel content, which assures commercial advantage.
In this paper, we present the most recent corrosion test results of UNS N08827 as a base material, as well as of welded coupons. The mechanical and corrosion properties of welded parts are compared with the same properties of the base material. Corrosion test results according to ASTM(2) G48 Methods C and D and ASTM G28 Practice A are provided. The experiments conclude that UNS N08827 has improved corrosion resistance in comparison to UNS N08825 and that welded products do have comparable corrosion properties as the base material.