American Society for Testing and Materials (ASTM). Current edition approved June 1, 2006. Published June 2006. Originally approved in 1967. Last previous edition approved in 2004 as B 462 – 04. 5 p. This specification covers forged or rolled pipe flanges, forged fittings, and valves and parts intended for corrosive high-temperature service.The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.