Surface Roughness Of Steel Sheet

The level of the grit impacts the surface roughness which is typically measured in terms of micro inches or micro meters represented as ra roughness average.

Surface roughness of steel sheet.

The finish provides a uniform dull surface that is suitable for painting and lacquering. The surface finish of a machine part may be important to reduce friction with other machine parts or to improve the aesthetics of the part. K roughness of duct pipe or tube surface m ft d h hydraulic diameter m ft typical duct materials and their use. 1d stainless steel is sometimes used as the starting point for polished finishes.

Typical ra would be 3 50 7 50 µm 140 300 µin. Galvanized steel most common material used in fabricated duct work for most comfort air conditioning systems. R relative roughness. Sometimes steel surface finish is also referred to as surface texture or surface roughness.

Surface roughness is a measure of the texture of a surface. R k d h 1 where. Cold rolled sheets are produced with the following finishes which are defined with a specific quantitative roughness values that are determined using a profilometer. Steel surface finishes are often an important aspect of custom machine parts.

It is quantified by the vertical deviations of a real surface from its ideal form. The roughness as measured using a profilometer is approximately 35 to 65. In practice it is often necessary to know both the ampli tude and frequency to ensure that a surface is fit for purpose 1. Roughness is typically considered to be the high frequency short wavelength component of a measured surface.

The higher the grit numbers the finer the polishing lines and more reflective the finish. Two materials shot blast and edt with extreme ra level 3 01am used in sanitary applications are tested as a reference. Sibetex with even larger ra values between 1 5 and 21jm still show an a i. Values of about 70.

There is no visible figrainfl with this finish. However common applications of this stainless steel surface finish involve non decorative purposes. The resulting surface is slightly coarse with very low reflectivity and a typical average roughness ra between 4 7 micrometers. Relative roughness can be expressed as.

2b mill finishis a bright defect free finish that is produced by a final light cold roll pass on polished rolls. If these deviations are great the surface is rough if they are small the surface is smooth. Surface consistency is key to this type of finish.