[MW:18329] MATERIAL INSTEAD OF of A743 CB30 FOR DISK ON CHECK VALVE

Hi

WHAT IS THE CASTING MATERIAL INSTEAD OF A743 CB30 FOR MADE A DISK FOR CHECK VALVE 30" #600 IN NATURAL SWEET GAS SERVICE .  THE ORIGINAL DISK THAT MADE FROM A743 CB30 WAS BROKEN AND DISTORTED   IN SERVICE.

P.Khazraei

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