Code 3018 applies to employers engaged in hot or cold iron steel rolling mill operations with or without puddling furnaces.  It includes cold rolling, drawing or doubling processes.  A rolling mill is a machine equipped with a set or train of rolls for shaping metal by repeatedly passing it between rolls.  This process thins the iron or steel reducing its gauge.  Usually the steel or iron is cleaned of scaling or rust before rolling.

Also contemplated under this classification is the embossing of coil and sheet metals.  The sheet stock may be used as is or it may be polished by the employer.  It also may have a finish applied to it which may be performed by an outside source.  When the preliminary work is completed, the sheet metal is hand fed into the embossing machines.  These types of machines use an upper and lower die to emboss a particular pattern onto the sheet.  The sheet may decrease slightly in width and length.  Once through the embossing rollers, the sheet may be sheared.

There are many types of steel such as carbon steel, killed steel, capped steel, or rimmed steel. These terms represent the chemical makeup of the steel. 

There are other terms used in the iron or steel rolling process such as annealing, slitting, edge condition, banding or oil dipped.