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API TR 5NCL : 2025

Nickel Content Limits for API 5CT Sour Service Products

Standard Details

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.

General Information

Status : ACTIVE
Standard Type: Main
Document No: API TR 5NCL : 2025
Document Year: 2025
Pages: 22
Edition: 1
  • Section Volume:
  • 01 Exploration and Production

Life Cycle

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API TR 5NCL : 2025
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