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Surface quality inspection method of carbon steel coil
After the carbon steel coil has been used for a long time, it is necessary to check it. This is a very critical step. In order to ensure the quality and safety of the carbon steel coil, the quality of the pipe must be ensured during the inspection. Let's briefly understand the method of surface quality inspection of carbon steel coil.
1. If there are sundries on the surface of the carbon steel coil, especially when there is dust adhesion, 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. Differences in the atmosphere in the carbon steel coil furnace The atmosphere in the furnace is different in each part, and the formation of oxide scale will also change, which is also the reason for the unevenness after pickling. Therefore, the atmosphere in each part of the furnace is the same during heating.??
4. Objects in direct contact with the heated workpiece can only be used after being fully dried. However, if it is placed at room temperature after drying, the moisture will still condense on the surface of the workpiece in the case of high humidity. So it needs to be dried before use.
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