If the surface oxide thickness of the Stainless Steel Plate is not uniform, the surface roughness of the base metal under the thick place and the thin place is also different, and the surface oxide of the surface and the surface of the oxide deposit is soaked by the acid when the surface is pickled. Different, so the surface of the steel plate is not uniform. Therefore, when heat-treated by heat treatment, it is necessary to uniformly form scale. To meet this requirement, the 304 Stainless Steel Plate Manufacturer must pay attention to the following problems: (1) If the stainless steel plate is attached with oil on the surface of the workpiece during heating, the thickness of the scale at the oil attachment portion and the oxide thickness and composition of other portions are different, and Carburization will occur. The portion of the subcutaneous matrix metal that is carburized will be severely attacked by acid. When the heavy oil burner is initially burned, the oil droplets sprayed on the workpiece have a great influence. The fingerprint of the operator is also affected when it is attached to the workpiece. Therefore, do not touch the stainless steel directly with your hand, and do not let the workpiece stain with new oil. Must be worn with clean gloves. If the surface of the workpiece is lubricated by cold working, it must be sufficiently degreased in trichloroethylene degreaser or caustic soda solution, then rinsed with warm water, and then heat treated. (2) Stainless steel plate If there is any foreign matter on the surface, especially when organic matter or ash adheres to the workpiece, heating will of course have an effect on the scale. (3) Differences in the atmosphere of the stainless steel plate furnace The atmosphere in the furnace is different in each part, and the formation of the scale is also changed, which is also the cause of unevenness after pickling. Therefore, the atmosphere of each part of the furnace must be the same when heated. To this end, the circulation of the atmosphere must also be considered. In addition, if bricks, asbestos, etc., which constitute the gantry for heating the workpiece, contain water, the water will evaporate when heated, and the atmosphere directly contacting the water vapor will be different from the atmosphere of other parts, and the formation of scale will of course be It is different. Therefore, objects that are in direct contact with the heated workpiece must be thoroughly dried before use. However, if it is placed at room temperature after drying, the moisture will still condense on the surface of the workpiece under high humidity. Therefore, it is best to dry before use. (4) Stainless steel plate If the part of the treated part has residual scale before heat treatment, there is a part of the scale remaining and the part without the scale after heating, and the thickness and composition difference of the scale may occur, causing pickling. The surface is not uniform, so not only the final heat treatment, but also the intermediate heat treatment and pickling should be paid attention to. (5) There is a difference in the scale produced by the stainless steel surface in direct contact with the gas or the flame of the oil and the place where it is not in contact. Therefore, it is necessary to make the treatment member not directly contact the flame port when heating. (6) Effect of different surface finish of stainless steel plate If the surface finish is different, even if it is heated, the scale of the surface is not the same as that of the fine part. For example, in a place where a partial defect is cleaned and a place where it is not cleaned, the condition of forming a scale is different, so that the surface of the workpiece after pickling is uneven.
