American Society for Testing and Materials (ASTM). Current edition approved Sept. 1, 2007. Published October 2007. Originally approved in 1981. Last previous edition approved in 2005 as A 790/A 790M – 05b. 8 p. This specification2 covers seamless and straight-seam welded ferritic/austenitic steel pipe intended for general corrosive service, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures.