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B51-14 (R2019) – Boiler, pressure vessel, and pressure piping code

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API TR 5NCL

API TR 5NCL, 1st Edition: Nickel Content Limits for API 5CT Sour Service Products

CDN $164.00

This publication was last reviewed and confirmed in 2025.

API TR 5NCL Nickel Content Limits for API 5CT Sour Service Products

SKU: fc2335b2c93c Category:

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.

Edition

1

Published Date

2025-04-18

Status

Current

Pages

22

Language Detail Icon

English

Format Secure Icon

Secure PDF

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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