API TR 6MET
Metallic Material Limits for Wellhead Equipment Used in High Temperature for API 6A and API 17D Applications
|Publication Date:||1 August 2018|
Testing was performed in four phases, presented herein in chronological order as Phase I, Phase II, Phase III, and Phase IV. Initially, all testing was to be completed in two phases, but testing anomalies in Phase II prompted re-testing of some alloys in Phase III and later in Phase IV.
Alloy candidates were recommended by AWHEM membership for analysis and confirmed by API's approval of New Work Item No. 2003-100786 in June 2002. Several material suppliers and several AWHEM member companies donated material for testing. Metallurgists on the task group screened material certificates to ensure a "normal" chemistry without enhancements for the material candidates listed in Table 1, Table 2, and Table 3.
Another API New Work Item approved in 2014 covered a new round of testing of austenitic precipitation-harden
A summary of the yield strength derating factors from testing of the 11 alloys is provided in Table 5 and compares favorably with the available data from literature, as provided in Ta ble 6.
Alloy chemistries from the material certificates for each of the supplied alloy candidates are provided in Table 7 through Ta ble 18, located at the end of the text portion of this report for readability