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For Grade 122, revised allowable Stress is same for tube and pipe? according to a paper by Kimura et al, the allowable stress of tube are lower than Pipe,especially for tubes with dual phases microstructures.

Dear metengr, when will the new version of Code case 2179 and 2180 come out? We have been using these two materials in our projects, some used the allowable stress values in ASME code case 2179-2 in some earlier untits, however we turned to the data from ECCCC later. Thanks!

Thank you for your reply! so WP91 include seamless and weld Tee, and the thickness should be different for the same conditions?

Hello! Do you use P91 welded pipe fittings, such as weld Tees?

Dear members: can you offer me some information about DMV310N,a steel for boiler superheaters from Germany?

another question: IF the AC1 is exceeded during PWHT, fresh martensite will form, can we just re-PWHT the weld, replacing the NT followed by tempering?

Dear members, delta-ferrite is deleterious to the creep properties and toughness of Martensite steels ,such as P91 and P92. delta-ferrite is often observed in weld metal and at fusion line. If the PWHT temerature exceed the transformation temperature and with normal cooling rate (such as 80-150...

dear davefitz, how to find the recent ASME proposals to modify the required fab and weld procedures of P91, is it included in the 2004 version?

Dear sirs, While welding the P91 pipe, the postheating maybe carried out directly after the welding, or firstly cooled to 80-100 degree then reheating to 300-350 degree, which is better? does it influence the microstructure and properties of the weldment? another question, anybody has studied...