... Cast Slab & BilletDirect chill cast billet is manufactured by XYCM as the starting material for other magnesium products, such as ... However, it has been frequently found that the cast billet is suitable for machining into prototypes, thus avoiding expensive tooling, and ... as per AZ31B, AZ61A, AZ80A and ZK61M. Inspection standards for billet will be by agreement. Ultrasonic Inspection as per AMS-STD ...