1, after cooking, if there are white spots on the bottom of the pot, this is the precipitation and attachment of impurities in the water after heating. You can try to remove them by adding a little white vinegar to hot water without affecting normal use.
2. When the stainless steel material is burned by flame, rainbow-like patterns may appear, which is the essence of stainless steel, not a quality problem, and does not affect its use.
3. Stainless steel not only has strong chemical stability, but also has sufficient strength and plasticity, and has stable mechanical properties at a certain high temperature or low temperature. Some of them can be used as high-quality low-temperature steel, and the corrosion resistance is still excellent during use.
Extended data
Scale, commonly known as "water rust, water alkali", refers to the white block or powdery substance that the minerals contained in hard water attach to containers (such as pots and kettles) after boiling. The main components are calcium carbonate, magnesium carbonate, calcium sulfate, magnesium sulfate, calcium chloride and magnesium chloride.
Scale has poor thermal conductivity. If the scale formed in the boiler is too thick, it will reduce the efficiency of the boiler and even lead to boiler explosion and boiler accident.
The scale is mainly caused by the fact that the boiler feed water contains salts such as calcium and magnesium, which precipitate after heating and attach to the metal surface. The thermal conductivity of oxide scale is very small, about 2 ~ 5% of that of ordinary steel. Scaling on the heating surface of boiler will greatly deteriorate the heat transfer effect and affect the efficiency of boiler.
Metal materials are easy to burn out due to local overheating, and even tube explosion accidents occur; It will aggravate electrochemical corrosion, cause boiler scale corrosion and accelerate the damage of heating surface. After the scale is formed, it should be removed by mechanical or chemical methods in time.
The effective way to prevent or slow down the scale formation is to strictly control the quality of water supply and take appropriate measures such as boiler water treatment and boiler sewage discharge.
References:
Baidu Encyclopedia-Scale