Sanitary fittings are useful in many industries, such as food, storage, and transportation. The sanitary fitting is made of stainless steel, which can be divided into three categories: socket sanitary fitting, sanitary flange fitting, and sanitary welded fitting. The following are three major characteristics of sanitary fittings.
The weldability of the sanitary fittings is different due to its different uses. Some tableware has no welding performance requirements, including some pot enterprises. However, the vast majority of products require raw material welding performance, such as second-class tableware, thermos cup, steel pipe, water heater, water dispenser.
Many stainless steel sanitary fittings have good corrosion resistance in food, such as first or second class tableware, kitchenware, water heater, water dispenser, etc. Many vendors have also tested the corrosion resistance of sanitary fittings. They warmed the NaCl aqueous solution to boiling, dumped the solution for a period of time, sucked it clean and dried, and determined the extent of corrosion by weighing the loss of weight. It should be noted that when the product is polished, the rust spots will appear on the surface of the test due to the composition of Fe in the emery cloth or sandpaper.
At present, many industries have to polish stainless steel sanitary fittings, only a few products such as water heaters, water dispenser, and so on do not need.
There are several factors that affect the polishing performance of sanitary fitting. The first is the material surface defect such as scratches, spots, pickling and so on. The next is the material quality of sanitary fittings. If the hardness is too low, it will not shine when polished, and the surface will be prone to orange peel when stretched. Thirdly, small black spots and ridges will appear on the surface of the highly deformed area after deep drawing, thus affecting polishing properties.
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