4130, 4140 and low alloys. When does NACE MR0175 require SSC testing for qualification?
NACE MR0175/ISO 15156 Part 2/Annex A: Q&A on Cr-Mo Low-Alloy Steels
This article provides valuable information in a question-and-answer format related to NACE MR0175/ISO 15156 part 2/Annex A on the acceptability of Cr-Mo low-alloy steels for specific hardness and SMYS grades, and SSC resistance testing.
Do the Requirements in A.2.2.3.2 and A.2.2.3.3 Apply Only to Specific Ranges of Hardness?
The first question asks if the requirements in A.2.2.3.2 and A.2.2.3.3 apply only to specific ranges of hardness, to which the answer clarifies that limits for AYS and SSC resistance testing must also be met.
Are SSC Results for Similar Applications Valid If Tested Only Once for Materials Meeting A.2.2.3.3 Requirements?
The second question asks if SSC results for similar applications are valid if tested only once for materials meeting A.2.2.3.3 requirements, to which the answer explains that if stricter criteria for higher hardness and yield strength requirements are satisfied, the materials will be acceptable for less strict material conditions.
Are Any UNS G41XX Grades with Hardness <= 22 HRC Acceptable Without Additional Testing If They Meet NACE MR0175 Chemical Composition Requirements?
The third question seeks to determine if any UNS G41XX grades with hardness <= 22 HRC are acceptable without additional testing if they meet NACE MR0175 chemical composition requirements, to which the answer confirms that such materials are acceptable without further testing if they meet specific requirements detailed in Clause A.2.
Is There an Official and Recognized List Associated with NACE MR0175-2 = ISO 15156-2 Ed 2015 for Material Qualified Upon Field Experience?
The fourth question asks if there is an official and recognized list associated with NACE MR0175-2 = ISO 15156-2 ed 2015 for material qualified upon field experience, to which the answer confirms that there is no official record that tracks and documents field experience.
Selecting Cr-Mo Low-Alloy Steels for Sour Service
Finally, the article offers the services of the team at OGC Energy to help clients select Cr-Mo low-alloy steels for sour service and specify the right requirements to ensure fitness for purpose.