Class Code: 3018
Per NCCI's Scopes Code Description:
Code 3018 contemplates a hot or cold rolling process performed by specialist rolling mills or by steelmaking plants performing finishing rolling operations, provided such plants do not operate open-hearth, Bessemer, electric or crucible furnaces. The cross-reference phraseology contemplates an exclusive cold rolling process. Insureds engaged in cold rolling of steel secure their raw material in the form of hot rolled ribbon stock of a thickness somewhat greater than that of the rolled steel which is to be produced.
This code is also applicable to the manufacture of sheet iron or steel by the doubling process. In the doubling process, heated tin plate bars are rolled, drawn out and doubled by folding on themselves. This heating, rolling and doubling is done repeatedly until the sheet metal is as much as 16-ply in the final rolling. The edges are then trimmed square and the pile of sheets is opened, pickled in a sulphuric acid solution to remove iron oxide, cold rolled for burnishing and annealed to specifications. Some sheets will be tinned (covered with molten tin) using special apparatus. Following inspection, the sheets are packed for shipment.
Massachusetts Code 3018 does not contemplate any process other than cold rolling or drawing. Hot rolling is to be separately rated.