Cold rolled steel, also called CRS, is a process used to finish steel. Hot rolled steel is steel that is still warm enough to be malleable and run through pressure rollers. After cleaning, when the steel has cooled and is no longer elastic, the steel is then put through power rollers and cold rolled between two large rollers. This produces a product that has a fine, smooth finish.
The cold rolled steel process is formed into its final shape when the metal’s temperature is below 1700 F, typically at room temperature. At this lower temperature, cold rolled steel does not shrink allowing for better accuracy when measuring it.
Cold rolled steel is usually chemically treated to lessen corrosion. It has a uniform attractive surface and can be easily painted.
A good drawing should include material, material thickness, finishes, tolerances, revisions and any hardware call outs. It will display a face view and/or top view, plus any additional views of the side(s) or the edge. Hidden lines should also be included in the drawing. A hidden line is the dotted line on a drawing that shows where a bend is. The edges of the drawing are solid lines.
It is pointless and discouraged to submit a drawing that displays a flat view that is going to get bent. All companies have different bend allowances and the flat drawing cannot give an exact length, unless the engineer makes each drawing for each manufacturer. The manufacturer has to consider what their bend tolerance is, K-Factor, to make the part. The K-Factor is the amount the metal will stretch when it is bent.