Step1:Grind down any welds that are still on the pipe. Use a grinding disc and grinder for this task.
Step 2:Mount the pipe into a pipe vise or similar set-up. If you don't have a professional pipe vise, you can use a regular vise wrapped with a towel or fitting with a rubber cap, but a professional vise is recommended. You will be applying a great deal of downward pressure to the pipe during the polish.
Step 3:Apply a polishing compound to the pipe. Then slide your polishing belt (120 to 180 grit) onto the pipe and around the head of a grinder (fitted with a belt wheel sized to your pipe width). Hold this below the steel pipe and move it slowly back and forth across the pipe, sanding as you go.
Step 4:Apply additional polishing compound as needed. Then continue to use the grinding belt wheel to polish the pipe by sliding it along the pipe with steady motions.
Step 5:Apply polishing compound to the stainless steel pipe and buff the fine lines out with a buffer grinding disc.
Step 6:Repeat until you have a stainless steel pipe polished to the finish you desire.