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API TR 5NCL
API TR 5NCL Nickel Content Limits for API 5CT Sour Service Products
CDN $149.00
This publication was last reviewed and confirmed in 2025.
Description
This technical report is a review of the literature and subsequent corrosion testing performed to explore if the limits on nickel (Ni)-content in low-alloy steels (LAS) can be revised.
There exists a legacy limitation on the Ni-content in LAS for deployment in sour service due to a perception on significantly reduced resistance to sulfide stress cracking (SSC) when nickel contents above 1 wt% are present.
The outcome of the study suggests that Ni-content may not restrict SSC resistance of LAS, and the underlying microstructure obtained from processing, such as heat treatment and mechanical processing, plays a more important role instead.
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Edition
1
Published Date
2025-04-18
Status
Current
Pages
22
Language
English
Format
Secure PDF
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Abstract
This technical report is a review of the literature and subsequent corrosion testing performed to explore if the limits on nickel (Ni)-content in low-alloy steels (LAS) can be revised. There exists a legacy limitation on the Ni-content in LAS for deployment in sour service due to a perception on significantly reduced resistance to sulfide stress cracking (SSC) when nickel contents above 1 wt% are present. The outcome of the study suggests that Ni-content may not restrict SSC resistance of LAS, and the underlying microstructure obtained from processing, such as heat treatment and mechanical processing, plays a more important role instead.
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