1.1 This specification covers gray iron for castings suitable for pressure-containing parts for use at temperatures up to 350°C.

1.2 Castings of all classes are suitable for use up to 230°C. For temperatures above 230°C and up to 350°C, only Class 275, 300, 325, 350, 380, and 415 castings are suitable.

1.3 This specification is the SI companion to Specification A278.