American Society for Testing and Materials (ASTM). Current edition approved Oct. 1, 2008. Published November 2008. Originally approved in 1965. Last previous edition approved in 2003 as A532/A532M – 93a. 4 p. This specification covers a group of white cast irons that have been alloyed to secure high resistance to abrasive wear in the applications of the mining, milling, earth-handling, and manufacturing industries.