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ASTM A724 Grade C in the standard ASTM A724/A724M is a kind of carbon steel plates material used to fabric welded multilayer pressure vessels. jwvivian98 (at) yahoo (dot) com Skype jw-vivian (at) hotmail (dot) com A724 Grade C is also a Quenching + Tempering steel material. ASTM A724 have three types Grade A, Grade B, and grade C .
ASTM A724 Grade C