The edge radii for stainless steel square tubes and stainless steel rectangular tubes are usually the content of the questions, in expert discussions and also decision-making criteria. How to use this type of stainless steel profiles. Sharp-edged radii in the case of stainless steel shape pipes are relative statements and perceptions.

Some of the used rectangular tubes need fine surfaces. It demands on their purpose were they are needed. Pharmaceutical machinery needs surfaces with Ra less than 0,4my.

The stronger the material thickness, the more the edge radius emerges. About 3 times the material 

thickness of the profile gives the edge radius.

The stronger the material thickness, the more the edge radius emerges. About 3 times the material thickness of the profile
gives the edge radius

Stainless steel tubes with small radii are severely limited by the manufacturing process. The common radii are due to the forming process. Due to the increasing material thickness, the radii are 1.5-3 times the material thickness. That means with a 2mm thick square tube the radius is approx. 3mm.