Stainless steel pipe manufacturers tell you how to inspect the surface quality of stainless steel pipes.

Stainless steel pipe manufacturers tell you how to inspect the surface quality of stainless steel pipes.
Stainless steel pipe overview quality inspection: 304 stainless steel pipe profile quality of right and wrong, mainly in the pickling process after the heat treatment, if it is the previous heat treatment process caused by the general oxide scale thickness, or the structure is not uniform, then the pickling is not enough to improve the general brightness and balance. Therefore, it is necessary to flesh out the general liquidation of the heating or thermal disposal before the thermal treatment. If the thickness of the oxide scale of the stainless steel pipe is not uniform, the general brightness of the matrix metal under the thick place and the thin place is also different, and the dissolution of the general oxide scale during pickling is different from the corrosion degree of the matrix metal at the part of the oxide scale attachment to the oxide scale, so the general profile of the steel steel pipe is not uniform. Therefore, when the heat is heated, it must be balanced to create the oxide scale. In order to meet this requirement, it is necessary to pay attention to the following problems: if the stainless steel pipe is heated with oil in the workpiece, the thickness of the oxide scale of the oil attachment part is different from the thickness and composition of the oxide scale of the rest of the part, and carburizing will occur. The carburized part of the substrate metal under the oxide skin will be nervously corroded by the acid. The oil droplets ejected when the heavy oil burner is first incinerated have a very Chinese New Year's Eve effect if they adhere to the workpiece. Manipulation of the Chinese New Year's Eve member's fingerprint attachment to the workpiece also has an effect. Therefore, bath workers should not simply touch Chinese New Year's Eve the stainless steel parts with their hands, and do not stain the workpieces with new oil. It must be operated with clean gloves.
Overview of 304 stainless steel pipe workpiece: If there is lubricating oil adhered to it during cold working, it must be filled with trichloroethylene degreaser and caustic soda solution and then rinsed with warm water, and then heat disposed. If the stainless steel pipe has impurities, especially when organic matter or ash adheres to the workpiece, the heating will certainly have an impact on the oxide scale. The difference of air in the stainless steel tube furnace The air in the furnace is different in each part, and the cause of oxide scale will also change, which is also the reason for the unevenness after pickling. Therefore, the air in each part of the furnace must be the same when heating. For this reason, it is also necessary to consider the circulation of air. In addition, if the bricks and asbestos that make up the bench used to heat the workpiece contain moisture, the water will evaporate when heated, and the air that comes into contact with the water vapor will be different, and the cause of oxide scale will be different. Therefore, objects that come into direct contact with the heated workpiece must be enriched and dried before they can be used. However, if left at room temperature after drying, moisture will still accumulate on the workpiece profile in the case of high humidity. Therefore, it is better to dry before exercising. If the 304 stainless steel pipe is disposed of if there is residual oxide scale before hot treatment, there is a residual oxide scale after heating and there is no oxide scale, there will be a difference in the thickness and composition of the oxide scale, which will cause the general situation after pickling is not uniform, so we should not only pay attention to the first thermal treatment, but also pay full attention to the intermediate thermal treatment and pickling. There is a difference between the profile of stainless steel that comes into contact with the flame of gas or oil and the oxide scale that occurs when it does not come into contact with it.