Stainless Steel Finishes

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  • Stainless Steel Finishes

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Stainless Steel Finishes
NO.1 surface finished description
Plate is hot rolled, annealed, pickled and passivated. This results in a dull, slightly rough surface; quite suitable for industrial applications which generally involve the range of plate thicknesses. Grinding marks may be visible in isolated areas.
Some of the thinner thicknesses within the plate range are Cold Rolled; but Sheet, Coil and Strip gauges are produced by Cold Rolling, ie rolled without and heating of the material. Cold Rolling hardens the material, and the thinner sizes may have to be subjected to an intermediate anneal and pickle, or bright annealed, during the reduction of thickness to final gauge.
The starting material for Cold Rolling always has a No. 1 finish. Cold Rolled material is supplied with the following standard mill finishes.

The introduction of stainless steel surface finished

The surface of Stainless Steel is actually and extremely thin but stable and passive Chromium rich oxide film, on which Stainless Steel relies for its excellent corrosion resistance. The surface finish on Stainless Steel should therefore be developed and maintained to ensure this vital property, and also for the secondary reason of the pleasing aesthetic appearance of Stainless Steel.

Rolled finishes are created when a stainless steel coil is passed through a set of rolls. The finish on the rolls is transferred to the surface of the coil. They are directional and, if panels are not installed in the same rolling direction, a checkerboard appearance can result.
To prevent this problem, the rolling direction should be marked on the back of the panel. Dirt and debris accumulation is greater when directional finishes are installed with a horizontal grain orientation.

Stainless steel also can be colored by electrochemical coloring, sputtering, plating, and resin-based paints.
The scratch resistance, appearance, and color stability of these processes varies considerably and should be taken into consideration during selection. Although some of these processes improve corrosion resistance, this should not be considered a substitute for selecting an appropriate grade of stainless steel for the environment.

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