QQ-C-390B type 3 has been superseded by ASTM B505
QQ-C-390B type 2 has been superseded by ASTM B271
Notice of Cancellation for QQ-C-390B, Notice 2, October 28, 1993.
QQ-C-390B, dated December 12th, 1983 is hereby cancelled. Future procurement's for this material should refer to the appropriate portions of:
ASTM B505, Copper-base Alloy Continuous Castings
ASTM B271, Copper-base Alloy Centrifugal Castings