304 stainless steel surface treatment of problems that need attention

304 stainless steel plate attached to the surface when subject to cold oil, etc., must be fully skimmed and then wash with warm water and degreaser trichlorethylene, caustic soda solution, and then subjected to heat treatment.

If the surface of stainless steel debris, especially when attached to the workpiece on the organism or gray, heating will certainly have an impact scale.

Differences stainless steel furnace atmosphere furnace atmosphere is different in each local, scale will be formed on a change, which is caused by uneven pickled reasons. Therefore, at the time of heating, atmosphere in the furnace of the various parts must be the same. To do this, we must also consider the atmosphere of the cycle.

      

Also, by constituting the heating workpiece gantry brick, asbestos, etc., if it contains water, when heated, the water will evaporate, direct contact portion with the other portion of the steam atmosphere will be a difference, of course, the scale formation different. Therefore, the object in direct contact with the heating of the workpiece, must be fully dried before use. However, after drying at room temperature as placed under high humidity conditions, water still condense on the surface of the workpiece. Therefore, it is best dried before use.

304 stainless steel if the local member before the heat treatment process has a residual oxide, oxide after heating the remaining parts of the site and without scale, there will be differences in the scale thickness and composition on the surface does not cause acid after uniform, so not only pay attention to the final heat treatment, but also to give full attention to intermediate annealing and pickling.