Surplus Steel Pipe is unused pipe from the mill. It is not considered Mill Order Prime Pipe because of a few factors. Usually this pipe has some visual damage because it has been sitting in inventory for a while, but it has not been previously used. Because this pipe has some wear from sitting in inventory for an extended period of time, the pipe may have no traceability back to the mill. The records may have been lost or misplaced over time, which gives the pipe no traceable element back to the mill.