api 6a718 work group on addition of nickel base cras api sc6 winter 2013 meeting paul maxwell
TRANSCRIPT
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API 6A718 Work Group on Addition of Nickel Base CRAs
API SC6 Winter 2013 Meeting
Paul Maxwell
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Objective• Provide requirements for Age Hardened Nickel
Base alloys used in the manufacture of API 6A pressure-containing and pressure-controlling components to assure they are not embrittled by the presence of an excessive level of deleterious phases and meet minimum metallurgical quality requirements.
• These additional requirements include detailed process control requirements and detailed testing requirements.
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Working in Conjunction with
API5CRA Work Group on
Adding Precipitation Hardenable Nickel Base Alloys to API5CRA
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38 Participants
Representing 27 Companies
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4 - API6A 718 Work Group Meetings
4 - API5CRA Work Group Meetings
Additional Sub-group meetings working on;Microstructure, NDT, Heat treatment, etc.
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Progress
Scope and Purpose
Chemical Compositions
Manufacturing Procedures
Heat Treatment Procedures
Mechanical Properties
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To Be Resolved
Microstructure Requirements
Grain Boundary Precipitate Acceptance Criteria
Photomicrographs – Informative
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Microstructure IssueGrain Boundary Precipitates Believed to be Detrimental to Hydrogen Embrittlement Resistance
No Data Available to Indicate what level of grain boundary precipitates might be acceptable
No Agreed upon Test Method for Hydrogen Embrittlement
No Quantitative Test Available for Determining Susceptibility to Hydrogen Embrittlement
Rating of Microstructures is Qualitative and Subjective
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Microstructure Sub-Group Working on Resolution of Grain Boundary Precipitate Issue
Next Work Group Meeting Pending Outcome of Microstructure Sub-Group
If Issue Can Not be Resolved Sub-Group will Proceed Recommending that the Grain Boundary Precipitate Requirements be Omitted until Hydrogen Embrittlement Test Results become Available
NEXT STEPS
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API 6A718 Work Group on Additional Etchant for Alloy 718
Has Been Rolled in to Work Group on Addition of Nickel Base CRAs
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API 6A718 Work Group on Higher Strength Classes on 718
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On Hold
• Concern that 140 ksi 718 is Prone to Hydrogen Embrittlement
• Awaiting Agreed Upon Test to Compare Hydrogen Embrittlement Resistance