304 stainless steel plate surface quality inspection method and matters needing attention

General Situation of 304 Stainless Steel Pipe Quality Inspection Methods and Matters Needed
Quality inspection of general situation of 304 stainless steel pipe: 304 the black and white quality of general situation of stainless steel pipe, the first decision is to pickling process after heat treatment. If the general situation oxide formed by the previous heat treatment process is thick or the organization is uneven, pickling cannot improve the general situation finish and average. Therefore, it is necessary to enrich the general situation of heating or cleaning before heat treatment. If the thickness of the general oxide scale of the stainless steel pipe is uneven, the general finish of the base metal under the thick place and the thin place is also different, and the ablation of the general oxide scale and the erosion level of the base metal at the part where the oxide scale is attached are different when the surface is pickled, so the general situation of the steel pipe is uneven. Is to, in the heat treatment heating, must make the average formation of oxide scale. To meet this requirement, we must pay attention to the following problems: if the stainless steel pipe is attached to the oil when the workpiece is heated, the thickness and composition of the oxide scale of the oil attachment part and the thickness and composition of the oxide scale of other departments will be different, and carburizing will occur. The sector where the base metal is carburized under the oxide skin will be severely attacked by the acid. Heavy oil burner when the initial combustion of the oil droplets, if attached to the workpiece, the impact is also very large. The operation of the eve of the fingerprint attached to the workpiece will also have an impact. Therefore, bath workers should not touch stainless steel parts directly with their hands, and should not make the workpieces stained with new oil stains. Must wear clean gloves to operate. 304 stainless steel pipe workpiece profile if there is cold processing when attached to the lubricating oil, etc., must be in the trichloroethylene degreasing agent, caustic soda solution to enrich the degreasing and then wash with warm water, and then heat treatment. If there are sundries in the general situation of stainless steel pipe, especially when organic matter or ash adheres to the workpiece, heating will certainly affect the oxide scale. The difference of atmosphere in the stainless steel pipe 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 uneven after pickling. Therefore, during heating, the atmosphere of each part of the furnace must be the same. To this end, it is also necessary to consider the reincarnation of atmosphere. In addition, if the bricks and asbestos used in the bench for heating the workpiece contain water, the water will evaporate during heating. The atmosphere of the department directly contacting water vapor will be different from that of other departments, and the formation of oxide scale will of course be different. Is to, and the heating of the workpiece in direct contact with the object, the need to enrich the drying can be used. However, if it is left at normal temperature after drying, moisture will still aggregate on the general surface of the workpiece in an environment with high humidity. Therefore, it is best to dry before use. If 304 stainless steel pipe has residual oxide scale in the part of the disposal part before heat treatment, and the part with residual oxide scale and the part without oxide scale after heating, there will be differences in thickness and composition of oxide scale, resulting in uneven general situation after pickling. Therefore, not only the final heat treatment should be paid attention to, but also the central heat treatment and pickling should be fully paid attention. There is a difference in the scale of stainless steel in direct contact with the flame of gas or oil. Therefore, it is necessary to make the disposal member not directly contact the flame port during heating.

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