ASME Code Cases Trade NameGradeMaterial (seamless)Code Case Issue Date NF616P929Cr-2W21798 August 94 HCM12AP12212Cr-2W21808 August 94 HCM2AT232.25Cr-1.6W-V-Cb21995 June 95 E911 9Cr-1M0-W-Cb23272 May 00
Caution: Dissimilar Welds Materials may NOT relax at operating temperature Watch thickness changes Choose Weld Metal Carefully Design PWHT Carefully Do not exceed A 1 of base or weld metal Assure tempering
Dissimilar Welds - Solutions Consider using transitions Machined transition to change section thickness “Pup” Pieces Multiple PWHT’s Where A 1 ’s are significantly different Nickel Base Butter
Low Bidder Simple: You get what you pay for….$$$ Low Overhead usually means minimal technical expertise Susie’s Botique and … Weld Shop “Offshore Enterprises” May have technical ability, but many things don’t translate well ….! ASME Codes and USA Contract Documents may be gathering dust…..
Low Bidder ? “…Pay Me Now, or Pay Me Later…” Fram Corp. 1971
ASME Code Changes (proposed) ASME I,PW-39; ASME VIII, Div.1, Part UCS; CC 2179 [P92]; CC 2180 [P122]; CC 2192 [Cast P91] CC 2199 [T23]; CC 2327 [E911] New Temperature Minimums < ½” = 1325 -1470 0 F (720-800 0 C) > ½” = 1350 -1470 0 F (730-800 0 C) Rules if heated above 1470 0 F (800 0 C) Why 1470 0 F (800 0 C) ?
Beyond the CrMo’s AlloyNominal CompositionDeveloper Haynes 23057Ni-22Cr-14W-2Mo-LaHaynes INCO 74050Ni-25Cr-20Co-2Ti- 2Nb-V-Al Special Metals CCA 61755Ni-22Cr-.3W-8Mo- 11Co-Al VDM HR6W43Ni-23Cr-6W-Nb-Ti-B Sumitomo Super 304H18Cr-8Ni-W-Nb-N Save 1212Cr-W-Co-V-Nb-N
Conclusions -B9 (P91), T23, T24, P92 & P122 Base Material & Consumables Available, proceed with caution… T24 & 122 Consumables Special Caution: Dissimilar Connections PWHT is Key to Success Beyond the CrMo’s ????
References Viswanathan, R., et al; “U.S. Program on Materials Technology for USC Plants”* Masuyama, F.; “Alloy Development and Material Issues with Increasing Steam Temperature”* Scarlin, Brendon, et al’ “Materials developments for ultrasupercritical steam turbines”* Henry, J.F.; “Advanced Supercritical Technology: Back to the Future”* Maile, K. et al; “Development and Qualification of New Boiler and Piping Materials for High Efficiency USC Plants”* Euroweld Seminar; June 2005; Columbus, Ohio *Fourth International Conference on Advances in Materials Technology for Fossil Power Plants, October 25-28, 2004, Hilton Head Island, South Carolina