dpl:
I have no idea what the ASTM spec. is, could not find that one. But I can give you this info from AWS A5.9-93.
*The AWS spec. does not note this is a replacement for any other filler metal (which they often do in the appendices of their specifications).
*Chemistry
16.4 Cr
4.7 Ni
3.6 Cu
*Primarily for welding ASTM A 564 Type 630 PH stainless.
*May be used in the AW or PWHT applications.
*UNS no.: S17480
*Good Luck.