Steel BG-42 AMS Number Alloy Type UNS Cross Ref. Spec Misc./Shape AMS 5749 BG-42 Steel S42700 AMS 5749 Bar BG-42 Steel S42700 - Bar AMS 5749 Forging BG-42 Steel S42700 - Forging AMS 5749 Tubing BG-42 Steel S42700 - Tubing AMS 5749 Wire BG-42 Steel S42700 - Wire