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answered Jun 1, 2016 by mobassey (1,250 points)
For ductile iron reciprocating compressors and pumps, all castings should be ferritizing anneal and have a microstructure containing a minimum of 90 percent of the Graphite as Type I and Type II Graphite as defined in ASTM A 395/A 395M.

Alloy 400 castings for use in hydrofluoric acid service should be grade M-35-1 as defined in ASTM A 494/A 494M except that (Si + 5 x C) should be less than 2.5 percent.