Why does boiling water in 316 stainless steel water cups smell?

Why does boiling water in 316 stainless steel water cups smell?
You can use a magnet to test whether it is stainless steel. If it attracts stainless steel, it will be stainless steel. Boil the water to remove the odor, put the thermos cup into the tea and boil it for 5 minutes, then wash it with clean water and dry it in the sun. The odor will disappear.

The stainless steel thermos cup is made of double-layer stainless steel inside and outside. Welding technology is used to combine the inner tank and the outer shell, and then vacuum technology is used to extract the air from the interlayer between the inner tank and the outer shell to achieve the effect of vacuum insulation. Stainless steel thermos cups are divided into ordinary thermos cups and vacuum thermos cups. In fact, the length of vacuum thermos cup insulation depends on the structure of the cup body and the thickness of the cup material. Generally speaking, the thinner the cup material, the longer it will keep warm.

However, the cup body is easy to be damaged and deformed, which affects the service life; measures such as covering the outer layer of the vacuum cup liner with metal film and copper plating can also increase the degree of heat preservation; large-capacity and small-diameter vacuum cups have a longer heat preservation time, and conversely, small-capacity vacuum cups , Large-diameter vacuum insulated cups have a shorter heat preservation time; the service life of the vacuum cup also depends on the cleaning of the inner layer of the cup and the time for vacuuming, and the most important thing is the structure of the vacuum furnace.

The vacuum equipment used in the society for vacuuming thermos cups includes vacuum exhaust tables and vacuum brazing furnaces. There are about two types and four types. One type is the bench type with tail vacuum exhaust; the other type is the brazing furnace type. Brazing furnace types are divided into: single chamber, multi-chamber, and multi-chamber with increased pumping speed. Single-furnace integral vacuum brazing furnace. The vacuuming cycle of this furnace is long. If the manufacturer wants to improve production efficiency and shorten the vacuuming time, it will affect the service life of the cup. The service life of the cup is only about 8 years.
Tail vacuum cup exhaust platform and its advantages: The tail exhaust means that the vacuum cup produced by the vacuum exhaust platform has a heating temperature of about 500°C during vacuuming. The shell of the vacuum cup is not easily deformed, but the welding of the copper tube is easy to touch. Leakage, special protection should be taken during processing of semi-finished products.

Another major category is the vacuum brazing furnace type, which is roughly divided into three types. Unexpectedly, although the vacuum insulated cups we usually use are no different from ordinary insulated cups in appearance, in terms of production technology, vacuum insulated cups are often Generally, insulated cups are much more complicated and technically difficult. Therefore, the price of vacuum insulated cups is at least twice higher than that of ordinary insulated cups.