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API 6A718 Work Group on Addition of Nickel Base CRAs

API 6A718 Work Group on Addition of Nickel Base CRAs. API SC6 Winter 2013 Meeting Paul Maxwell. Objective.

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API 6A718 Work Group on Addition of Nickel Base CRAs

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  1. API 6A718 Work Group on Addition of Nickel Base CRAs API SC6 Winter 2013 Meeting Paul Maxwell

  2. 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.

  3. Working in Conjunction with API5CRA Work Group on Adding Precipitation Hardenable Nickel Base Alloys to API5CRA

  4. 38 Participants Representing 27 Companies

  5. 4 - API6A 718 Work Group Meetings 4 - API5CRA Work Group Meetings Additional Sub-group meetings working on; Microstructure, NDT, Heat treatment, etc.

  6. Progress Scope and Purpose Chemical Compositions Manufacturing Procedures Heat Treatment Procedures Mechanical Properties

  7. To Be Resolved Microstructure Requirements Grain Boundary Precipitate Acceptance Criteria Photomicrographs – Informative

  8. Microstructure Issue Grain 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

  9. Microstructure Sub-Group Working on Resolution of Grain Boundary Precipitate IssueNextWork Group Meeting Pending Outcome of Microstructure Sub-GroupIf 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

  10. API 6A718 Work Group on Additional Etchant for Alloy 718 Has Been Rolled in to Work Group on Addition of Nickel Base CRAs

  11. API 6A718 Work Group on Higher Strength Classes on 718

  12. On Hold • Concern that 140 ksi 718 is Prone to Hydrogen Embrittlement • Awaiting Agreed Upon Test to Compare Hydrogen Embrittlement Resistance

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