If the stainless steel cold-rolled steel plate is heated with oil on the surface of the workpiece, the thickness of the oxide scale in the oil-stained part will be different from the thickness and composition of the oxide scale in other parts, and carburization will occur. The carburized part of the base material under the oxide scale will be severely corroded by acid. The oil droplets ejected by the heavy oil burner during the initial combustion will have a great impact if they adhere to the workpiece. When attached to the workpiece, the operator's fingerprints may also be affected. Therefore, do not touch stainless steel parts directly with your hands, and do not expose the workpiece to new oil. Clean gloves must be worn before operation.
If there is lubricating oil attached to the surface of the workpiece during cold working, it must be fully degreased in trichlorethylene degreasing agent and caustic soda solution, then washed with warm water, and then heat treated.
If there are impurities on the surface of the stainless steel plate, especially organic matter or ash attached to the workpiece, heating will definitely affect the oxide scale.
Differences in the atmosphere in the furnace of 304 cold-rolled steel plates. The atmosphere in the furnace is different in different parts, and the formation of oxide scale will also change. This is also the reason for the unevenness after pickling. Therefore, when heating, the atmosphere in all parts of the furnace must be the same. Therefore, the circulation of the atmosphere must also be considered.
Galvanized sheet: Galvanized sheet refers to a steel sheet coated with a layer of zinc on the surface. Galvanizing is a frequently used cost-effective corrosion protection method, and half of the world's zinc production is used in this process.
Cold rolled plate: Cold rolled plate is a product obtained by cold pressure processing of hot rolled sheet. Due to repeated rolling, its surface quality is better than that of hot-rolled sheet. After heat treatment, it can obtain good mechanical properties.
What are the differences between galvanized sheets and cold rolled sheets:
1. Physical properties: galvanized sheets have relatively strong corrosion resistance, and cold-rolled sheets have good drawing properties.
2. In terms of technology, cold-rolled plates are products obtained through hot-rolling technology. The processing is slightly more complicated and there will be no defects. The surface of galvanized plates will have pitting or oxidation due to the rust removal process.
3. The application scope is different. Cold-rolled sheets are used in automobile manufacturing, electrical appliances, etc., and galvanized sheets are used in the construction industry.
