Piping Material Specification 3NU0B01 Class 300, Alloy 20, (UNS N08020), Butt Weld, 0.000" C.A. Process (PTFE Packing/Gaskets)
standard by Process Industry Practices, 03/06/2006

Piping Material Specification 3NU0B01 Class 300, Alloy 20, (UNS N08020), Butt Weld, 0.000" C.A. Process (PTFE Packing/Gaskets) [Complete Revision]
standard by Process Industry Practices, 07/01/2014