Steel CBS 1000M AMS Number Alloy Type UNS Cross Ref. Spec Misc./Shape AMS 6256 CBS 1000M Steel K71350 AMS 6256 Bar CBS 1000M Steel K71350 - Bar AMS 6256 Forging CBS 1000M Steel K71350 - Forging AMS 6256 Tubing CBS 1000M Steel K71350 - Tubing