Stainless Steel Deburring
Q. We are cutting and machining a 304 stainless, 2'' diameter by 5'' long, cold-rolled, 2B-finished round tube. We need to deburr the parts, but we also have to blend the machined areas to match the original 2B mill finish. Some of the same parts also require a #8 finish. What is a #8 stainless finish, and can we use vibratory methods for our requirements?– J.K.
A. You have three finishing requirements: deburring, refinishing and refining an existing finish. These are all excellent applications for vibratory/mass finishing.
Let’s define the two finishing specifications (2B and #8) and then discuss the vibratory process solutions.
Stainless steel finishes have been standardized by the Stainless Steel Sheet Manufacturers Association. Two of the standard finishes are the 2B and #8. Below are their descriptions and how the mills arrive at these finishes.
2B is a cold-rolled finish with a final polish-roll pass that produces a matte finish with a minor sheen. This is the standard and most common stainless sheet, plate and cold-rolled tubing finish. Standard 2B mill finishes are on both sides of the sheet.
#8 is a bright, buffed finish with no lines. It is produced by the mill starting with a 2B finish, then multiple passes with a rigid heavy-duty wide-belt sander using a 120-grit-, 150-grit- and then 320-grit-coated abrasive polishing belts.