American Society for Testing and Materials (ASTM). Current edition approved Nov. 1, 2005. Published November 2005. Originally approved in 1967. Last previous edition approved in 2004 as B 464 – 04. 3 p. This specification covers welded UNS N08020, N08024, and N08026 alloy pipe for general corrosion-resisting and low- or high-temperature service.