I am looking for the material speci

[Metalero]

I am looking for the material specification: STD SLA 904, have you heard about it, could you guide me?

 

[WKTaylor]

Context?

Regards, Wil Taylor

o Trust - But Verify!
o We believe to be true what we prefer to be true. [Unknown]
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation,Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", Homebuiltairplanes.com forum]

 

[Metalero]

Context: appear like that in Old pipeline and petrochemical plant's draws. No more info.

 

[mk3223]

Is there any hint or mark-ups on the drawing regarding the process, line size, year of drawing, etc.?
Did you check the google for it?