The surface quality of 304 stainless steel wire mainly depends on the heat treatment and pickling process of the stainless steel wire. If the thickness of the oxide scale formed by the heat treatment process is uneven, and the surface finish of the base metal is different in the thick and thin areas, the pickling process will not The surface finish cannot be improved, so in order to control the surface quality of stainless steel wire, it is necessary to strictly control the two procedures of heat treatment and pickling.
How to make the heat-treated oxide scale evenly distributed? To do this, we must pay attention to the following issues:
If oil stains are attached to the surface of the stainless steel wire during heat treatment, the thickness of the oxide scale will be different from where there is no oil stains, and carburization will occur. The metal under the oxide scale will be corroded by the acid in the pickling process. Do not touch the stainless steel wire during heat treatment, because fingerprints will also affect the quality of the heat-treated oxide scale.
If the stainless steel wire is found to have oil stains before thermal processing, it must be fully degreased in trichloroethylene degreasing agent and caustic soda solution and then cleaned with warm water, and then heat treated.
The atmosphere in the 304 stainless steel wire furnace is different in each part, and the formation of oxide scale will also change, which is also the cause of unevenness after pickling. Therefore, when heating, the atmosphere of all parts in the furnace must be the same. For this reason, the circulation of the atmosphere must also be considered.
