Sealed unit casing Home › Forums › Scrap Metal Discussions › Scrap Metal Q & A › Sealed unit casing This topic contains 1 reply, has 2 voices, and was last updated by billf0675 6 months, 3 weeks ago. Author Posts April 26, 2017 at 6:41 am #3060 NicksterParticipant After everything is removed out of a compressor, what grade does your local yard consider the casing, prepared heavy? Shred steel? Or something else. Also the block is cast iron. May 2, 2017 at 11:23 am #3063 billf0675Participant Tin. Author Posts You must be logged in to reply to this topic.