P93 -ASTM A335

[alanisphoenix]

Hello, on last editions of ASTM A335 is include a new grade called P93.
I can see that have Co and Nd (neodimio?)

Anyone knows the use for this new grade? it looks so different from the P91 and P92, so i really don't know what kind of industries needs this new material with Co=2.5-3.5%

Really the addition is Nd or is a mistake and it is Nb (Niobioum)?

thank you

 

[EdStainless]

I don't have a new copy handy, what do they list for a UNS?
I presume that it is an enhanced creep resistant grade.
Rare earth additions are not uncommon in high temp steels.

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P.E. Metallurgy

 

[XL83NL]

No idea but Googling gave me this (sht 45/50 is on P93):

https://cdn.ymaws.com/

http://www.vma.org/resource/resmgr/2017_tech_seminar_presentations/Henley_Specifications_for_Po.pdf

Probably the new kid on the block (although Ive been reading a lot of positive expectations on alloy 740(H) for A-USC power plants).

I don't have a new copy handy, what do they list for a UNS?

K91350

 

[davefitz]

The link by XL83NL has some useful info on the P93 alloy ( AKA Nippon steel SAVE12AD, per asme sect I code case 2839). Basically 30% stronger than P92 at elevated temperatures.
I think there may be some differnces of opinion on some other items of that presentation, but it is a good summary of the trend in the desing of overseas supercritical plants.

"...when logic, and proportion, have fallen, sloppy dead..." Grace Slick

 

[alanisphoenix]

THANK YOU to all of you for the info.
The link seems to me very interesting.