American Society for Testing and Materials (ASTM). Current edition approved May 1, 2005. Published June 2005. Originally approved in 1984. Last previous edition approved in 2001 as B 737 – 01. 4 p. This specification covers hot- or cold-worked hafnium rod and wire, or both.
This specification contains two material grades, one specifically for nuclear applications (Grade R1) and one for commercial applications for alloying (Grade R3).