While we weld stainless steel with some regularity, the need for SAW is infrequent. We will be making both circumferential and longitudinal seams in some 4ft. diameter drums, 5/8 in. thick, 304L. (non-corrosive, not wetted) The existing SAW WPS flux is no longer available. I am looking for...
I found this in an old out of print book; Hoyt, Samuel L., Metal Data, Reinhold Publishing Co., copyright 1952, page 37
ASTM No. YP(psi, min) TS(Mpsi) %Elong-8" C content
A-70 Firebox Gr B 0.5TS 48/58 1550000/TS 0.10~0.15
Hope this helps some.