Stainless steel pipes are still used for a long time. After a long time, they need to be inspected. This is a very critical step. In order to ensure the quality and safety of stainless steel pipes, the quality of the pipe must be ensured when testing. Let's briefly understand the method of surface quality inspection of stainless steel pipes.
1. If there is debris on the surface of the stainless steel pipe, especially when dust adheres, heating will certainly affect the oxide scale.
2. If there is lubricating oil attached to the surface of the workpiece during cold working, it should be fully degreased in trichloroethylene degreasing agent and caustic soda solution, then washed with warm water and then heat treated.
3. The difference of atmosphere in the stainless steel tube furnace The atmosphere in the furnace is different in various parts, and the formation of oxide scale will also change, which is also the cause of unevenness after pickling. Therefore, the atmosphere in each part of the furnace is the same when heating.
4. Objects that are in direct contact with the heated workpiece must be fully dried before they can be used. However, if it is placed at room temperature after drying, moisture will still condense on the surface of the workpiece under high humidity. So it must be dried before use.