304 Stainless Steel Plate profile quality inspection methods and important points: The quality of 304 stainless steel profile profile is black and white. The first decision is the pickling process after thermal treatment. If the profile scale formed by the previous thermal treatment process is thick or the organization is uneven, Pickling does not improve the overall finish and averageness. Therefore, it is necessary to enrich the heat of thermal treatment, or clean up the outline before thermal treatment. In the case of Stainless Steel Tubing, the thickness of the oxide scale is uneven, and the base metal profiles under thick and thin spaces have different finishes, and when pickling, the profile of the oxide scale is ablated, and the base metal of the oxide scale is attached. The level of erosion by acid is divergent, resulting in uneven pipe profiles. Therefore, it is necessary to uniformly form oxide scales during heat treatment.
To meet this requirement, we must pay attention to the following issues:
If the 304 stainless steel plate has oil adhered to the outline of the workpiece during heating, the thickness of the oxide scale on the oil adhered portion and the thickness and composition of the oxide scale of other departments will be different, and carburization will occur. Substrate substrate metal, the carburized sector will be severely attacked by acid. When the heavy oil burner initially burns, if the sprayed oil droplets adhere to the workpiece, it will also have a great impact. It can also be affected when the fingerprint of the operator is attached to the workpiece. Therefore, the operator should not touch the stainless steel parts directly by hand, and the workpiece should not be stained with new oil. Always wear clean gloves.
Stainless Steel Plate
Overview of 304 stainless steel plate workpieces. If there is lubricating oil attached during cold working, it must be degreased in trichloroethylene degreaser and caustic soda solution, and then washed with warm water, and then heat treated. If the stainless steel pipe has impurities in it, if it is organic or ash is attached to the workpiece, the heating will of course affect the scale. The difference in the atmosphere of the 304 stainless steel plate furnace, the differences in the atmosphere in the furnace, the formation of oxide scale will also change, which is also the reason for the unevenness after pickling. Therefore, when heating, the atmosphere in each part of the furnace must be the same. For this reason, we must also consider the reincarnation of the atmosphere. In addition, if the bricks, asbestos, etc. that make up the stand used to heat the workpiece contain moisture, the moisture will evaporate when heated, and the atmosphere of the department directly in contact with water vapor will be different from that of other departments. Of course, the formation of oxide scale will also Just disagree. Therefore, the objects in direct contact with the heated workpiece must be fully dried before being used. However, if it is left at room temperature after drying, in a high humidity environment, moisture will still condense on the workpiece profile. Therefore, it is recommended to dry before use. If the 304 stainless steel plate has residual oxide scale before the thermal treatment in the part of the treatment part, the remaining portion of the oxide scale and the portion without the oxide scale after heating will show differences in the thickness and composition of the oxide scale, causing an overview after pickling. It is not even, so not only should we pay attention to the subsequent heat treatment, but also we should pay more attention to the intermediate heat treatment and pickling. The profile of stainless steel in direct contact with gas or oil flames is different from the scale that occurs in non-contact spaces. Therefore, it is necessary to prevent the treatment member from directly contacting the flame mouth during heating.
The above are the precautions for the use of 304 stainless steel plate introduced by 304 Stainless Steel Plate Supplier. Hope to help you.
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