American Society for Testing and Materials (ASTM). Current edition approved Sept. 1, 2007. Published October 2007. Originally approved in 1983. Last previous edition approved in 2005 as A 813/A 813M – 01(2005). 8 p. This specification covers two classes of fit-up and alignment quality straight-seam single- or double-welded austenitic steel pipe intended for high-temperature and general corrosive service.