304 stainless steel food-grade stainless steel

304 stainless steel is suitable for use in food processing, storage and transportation. Has good processing properties and weldability. Plate heat exchanger, bellows, household goods (1,2 tableware, cabinets, indoor pipes, water heaters, boilers, bath), auto parts (windshield wipers, muffler, mold products), medical equipment, building materials, chemical, food industry agriculture, ship parts, and so on. 304 stainless steel wire is a nationally recognized food-grade stainless steel.
surface quality is good or bad, depends mainly on the pickling process after heat treatment, a heat treatment if the first step of the surface oxide formed thick skin or tissue is uneven, it does not improve with pickled surface smoothness and uniformity. So to pay full attention to the heating surface cleaning or heat treatment before heat treatment.
If the thickness of the stainless steel oxide surface unevenness, thick and thin places where the underlying substrate metal surface finish is different, surface and pickling and surface oxide scale dissolution of the base metal attachment site is the extent of acid erosion different, therefore, the steel sheet surface is not uniform. Therefore, when the heat treatment is heated, so as to form an oxide skin must be uniform. To meet this requirement, you must pay attention to the following issues:
If the stainless steel plate attached to the surface of the workpiece during heating oil, the site of attachment of the scale thickness and the scale and the thickness of the other portion of different composition, and will produce carburizing. Subcutaneous base metal oxide is partially cemented will seriously eroded acids. When the combustion of heavy oil burner initially discharged droplets, if attached to the workpiece, a great impact. Operating heavyweight fingerprints attached to the workpiece when will be affected. Therefore, the bath as high officials do not touch the stainless steel parts, do not make a new piece stained with oil. The gloves must Daiqing Jie.
If the surface during cold lubricants attached, must be fully cleaned with warm water and then skim trichlorethylene degreasing agent, caustic soda solution, and then subjected to heat treatment.
If the surface of stainless steel plate with debris, especially when attached to a piece of organic matter or gray, heating certainly will affect the scale.
Differences stainless steel plate of the furnace atmosphere in the furnace atmosphere locally different, oxide scale formed will have 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, you must also consider the atmosphere of the cycle.