Imagination at work. Presented by Tim Haeberle Chief Consulting Engineer – Materials and Processes GE Oil & Gas 20 January 2016 API SC21 Austin, TX Status Update - UNS S66286 Elevated Temperature Tensile Testing Program

Background Issue initially raised at API SC6 Summer Meeting in 2013 by Joel Russo –Existing derating values in API 6A Appendix G and API TR6MET for ASTM UNS S66286 (A453 Grade 660) stainless steels seem to be unrealistic –The tables indicate the strength starts to decrease, but then increases with higher temperatures UNS S66286 derating values were removed from Appendix G in API 6A Errata 6 API SRRR approved in 2014 to provide funding for new elevated temperature tensile testing. 2

Background - Scope of API SRRR Obtain ASTM A453 Grade 660 Type D stainless steel bar stock from 3 heats Have 1-3 independent test labs perform elevated temperature tensile testing The test temperatures are to be room temp, 300F, 350F, 400F, and 450F 3 tensile test specimens from each heat are to be tested at each temperature by each lab. 3

API TG Formed 1.Bill Bailey – Baker Hughes 2.Chris Carlton – Chevron 3.Hernan Enrique Rincon – ConocoPhillips 4.Joel Russo – FMC 5.Joshua Rooker – Bohler-Edelstal 6.Egidio Marotta – GE 7.Pat Markle – ATI Metals 8.Saki Krishnamurthy – Carpenter Technology 9.Tim Haeberle – GE 10.Tinsley S. Fehnel – Carpenter Technology 4 Status Update – Actions Taken

Bill Bailey raised questions regarding the potential of a low temperature aging phenomena increasing the strength of Grade 660 Tinsley Fehnel with Carpenter Technology coordinated an aging study which showed the low temperature exposure did not increase the yield strength A detailed test matrix was finalized at the 7 October 2015 TG meeting Three mills have volunteered to supply the test material Quotations have been received from two labs for the tensile testing required API has issued PO’s to the two labs, with the final acceptance of the PO on Feb 2nd. 5

1800F Solution Anneal Data 6 Heat Treatment Average Y.S. (ksi) Average T.S. (ksi) Average El. (%) Average R.A. (%) Std Dev of Y.S. (ksi) 1796F/1h/WQ F/16h F/1h/WQ F/16h + 350F/16h F/1h/WQ F/16h + 400F/16h F/1h/WQ F/16h + 450F/16h Heat Treatment Average Y.S. (ksi) Average T.S. (ksi) Average El. (%) Average R.A. (%) Std Dev of Y.S. (ksi) 1650F/2h/WQ F/16h F/2h/WQ F/16h + 350F/16h F/2h/WQ F/16h + 400F/16h F/2h/WQ F/16h + 450F/16h F Solution Anneal Data This study indicates the low temperature exposure did not increase the yield strength Status Update – Carpenter Aging Study Results

7 Final Test Matrix ORIGINAL AWHEM UNS S66286 TEST PROPOSED API HPHT PROGRAM PROPOSED NEW API UNS S66286 TEST A. Number of heats533 B. Number of mill sources (company names)53 3 (ATI, Bohler, Carpenter Tech) C. Number of test labs (company names)32 2 (MTEC and Westmoreland) D. Number of test specimens per heat per test temp per lab355 E. Raw material diameter and length required per specimen8” ” dia & 6”long F. Test temperatures (number)RT, 300F, 350F, 450F (4) RT, 300F, 400F, 500F, 550F (5) RT*, 300F*, 350F*, 400F*, 450F (5) *in 6A Annex G G. Tensile test method(s)ASTM E8 & E21ASTM E8 & E21 ModASTM E8 & E21 Minor Mod H. Total cost per lab MTEC: $8, Westmoreland: $7, I. Total number of room & elevated temp tensile tests per lab (A X D X F) 75 J. Number of extra specimens per heat to be machined by each lab5 K. Total number of extra specimens to be machined by each lab (A X J)15 L. Length of bar to be shipped by each mill to each lab [E X F X (I+K) +5ft extra] 50 feet M. Total length of bar required for each mill [C X (I +K) + 5ft extra]100 feet N. Grade 660 heat treat condition ASTM A453 Type 660 Class D, Sol Ann 1650F, Age to KSI Yield

Actions Remaining Following final PO acceptance on February 2 nd, send request to vendors for test material to be shipped. ATI, Bohler and Carpenter Technology to ship test material sent to the two labs MTEC and Westmoreland to perform the room temperature and elevated temperature tensile testing API TG to generate a ballot to revise API TR6 MET in accordance with the findings API TG to generate a ballot to revise API 6A Annex G in accordance with the findings. 8

Thank you.

BACKUP SLIDES Title or Job Number | XX Month 201XSee tutorial regarding confidentiality disclosures. 11

Elevated Temperature Derating Data Issues The data in API Technical Report 6MET shows the yield strength of Grade 660 stainless steel is increasing with increasing temperature The yield strength of the other alloys decreases 12

Manufacturer Input Carpenter Technology historical data shows excellent 0.2% offset yield retention Why does Grade 660 show such excellent retention? Data does not cover exact temperatures used by API, but does show trend 13