Active standard | Published: 01/04/2025

API TR 5NCL

Nickel Content Limits for API 5CT Sour Service Products, First Edition

Available languages: English

Available design: electronic (protected pdf), Print design

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Detail information

Designation: API TR 5NCL

Publication date: 01/04/2025

Pages: 22

Country: American technical standard

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Anotation

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. See more

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