Method of Making Faux Stainless Steel Finish on Bare Carbon Steel Substrate

Abstract

A faux stainless steel sheet material of ferrous carbon sheet steel core is polished in a polishing apparatus comprising a series of commercially available polishing heads each of which utilizes a polishing belt of a predetermined grit mesh and size, belt speed, belt oscillations transverse to the sheet steel conveyed direction, at predetermined conveyance rate of the sheet steel and pressure. The polishing heads scratch the material surface wherein the scratches mimic a stainless steel finish such as #4 stainless steel finish (80 mesh). An example and sample are described in one embodiment of the invention.

1 . A method of producing a faux stainless steel sheet comprising polishing a ferrous carbon steel sheet material substrate surface with at least one abrasive particle loaded grit belt to form a surface finish that simulates a polished stainless steel finish on that surface. 
     
     
         2 . The method of  claim 1  wherein the polishing step comprises forming scratches in the surface with scratches having a length of about 9.5 mm (⅜ inch). 
     
     
         3 . The method of  claim 1  wherein the polishing step comprises polishing the surface to form substantially parallel scratches in the surface having a reflectivity in the range of about 80 to about 115 gloss units across the scratches and about 100 to about 170 gloss units parallel to the scratches wherein a gloss unit is the ratio of light specularly reflected to the total light reflected wherein specularly reflected light is one wherein the angle of incidence equals the angle of reflection. 
     
     
         4 . The method of  claim 1  wherein the polishing step comprises engaging a Si carbide particle loaded grit belt with the surface in transverse oscillations having an amplitude of about 6.35 mm (¼ inch) at 45 cycles per minute and at a sheet material feed rate of about 25.908-32 m/min (85-105 f/min). 
     
     
         5 . The method of  claim 1  including the step of forming an appearance of a commercially defined abraded polished stainless steel finish with a Si carbide particle loaded grit belt comprising about 80 mesh wherein the term mesh refers to the belt grit value. 
     
     
         6 . The method of  claim 1  including providing the surface with a surface roughness of about 10-20 RA. 
     
     
         7 . The method of  claim 1  including coating the polished substrate with a polymer coating to protect the underlying substrate from corrosion wherein the polished finish is visible through the coating. 
     
     
         8 . The method of  claim 1  including the step of forming the substrate to about 0.635 mm (0.025 inches) thick. 
     
     
         9 . The method of  claim 1  wherein the polishing step comprises removing up to about 0.0127 mm (0.0005 inches) of material from the substrate thickness. 
     
     
         10 . The method of  claim 1  wherein the polishing step comprises coating at least the polished surface with a coating that is sufficiently transparent so that the polished surface is visible through the coating.