If there are sundries on the surface of the stainless steel plate, it will affect the oxide skin.
If there are sundries on the surface of the stainless steel plate, it will affect the oxide scale. If the stainless steel plate adheres to oil on the surface of the workpiece during heating, the thickness of the scale of the oil-attached part will be different from the thickness and composition of the scale of other parts, and it will be Carburizing occurs. The carburized part of the base metal under the oxide skin will be seriously attacked by acid. When the heavy oil burner burns at first, the sprayed oil droplets will have a great impact if they adhere to the workpiece. It also affects when the operator's fingerprint is attached to the workpiece. Therefore, the bath maker should not directly touch the stainless steel parts with his hands, and do not make the workpieces stained with new oil. Always wear clean gloves. If there is lubricating oil attached to the surface of the workpiece during cold working, it must be fully degreased in trichloroethylene degreaser and caustic soda solution, then washed with warm water, and then heat treated. If there are sundries on the surface of the stainless steel plate, especially when organic matter or ash is attached to the workpiece, heating will of course affect the oxide scale. The difference in the atmosphere in the 304 stainless steel plate furnace, the atmosphere in the furnace is different in each part, and the formation of the oxide scale will also change, which is also the reason for the unevenness after pickling. Therefore, when heating, the atmosphere of each part of the furnace must be the same. Therefore, the circulation of the atmosphere must also be considered.
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