This is related to the wall thickness, and the other is whether it is a seamless pipe or a welded pipe. If it is a seamless pipe, please lower the gear of your welding machine when welding. If it does not need to be expanded after forming, Please refer to the heat treatment process of the product, whether it is water cooling, oil cooling, or natural cooling. This has a very subtle relationship. The heat treatment methods of 316L and 304 are different. I really want to make the round shape non-destructive after welding. Degree, unless you meet the technical requirements, you can only re-solidify.

Then pickle