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Alloy 29 and Alloy 825 for Chemical Injection Lines

Cold worked Alloy 28 (UNS N08028) and Alloy 29 (UNS N08029) have been successfully used as Oil Country Tubular Goods (OCTG) in H2S-containing downhole applications. Laboratory testing showed high stress corrosion cracking (SCC) resistance of these alloys in sour conditions outside of ISO limits for 4c type materials where Alloy 828 Alloy 28 and Alloy 29 belong to. Recently a similar study found in literature showed comparable results between cold worked Alloy 28 and Alloy 825 (UNS N08825). Alloy 28 Alloy 29 and Alloy 825 in annealed conditions belong to 4a type materials which have higher SCC resistance compared to the cold worked materials. Compared to Alloy 825 Alloy 29 is arelatively new material which has been introduced in control line and chemical injection line applications. However corrosion testing data is not always available for these materials in annealed conditions. ISO 15156-3 has no environmental limits for the 4a type materials. This work aimed at to provide pitting corrosion resistance data on the full-size tube materials for control line and chemical injection line in annealed conditions.Pitting corrosion resistance of Alloy 29 and Alloy 825 has been determined by critical pitting temperature (CPT) per ASTM G150 on full-size seamless tubes in annealed condition for control line and chemical injection applications. The effect of pitting resistance equivalent (PRE) has been studied by using Alloy 825 Alloy 316L (UNS S31603) in control line dimensions. Alloy 28 and Alloy 29 in cold worked condition for OCTG application were also included.The CPT was 70°C for Alloy 29 and 30 ~ 45°C for Alloy 825 which was mainly dependent on pitting resistant equivalent (PRE) of the materials. Alloy 29 and Alloy 825 belong to same category 4a and 4c type nickel-based alloys defined by ISO15156-3 for down-hole applications. Because Alloy 29 has higher PRE and lower Ni content compared to Alloy 825 Alloy 29 can be considered as a cost-saving material for control line and chemical injection line applications.

Product Number: 51319-13162-SG
Author: Wenle He
Publication Date: 2019
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$20.00
$20.00
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