Modern medical research has shown that drinking water with excessive copper (no matter whether it reaches the level of blue-green water) is extremely harmful to health.īecause the thin-walled stainless steel tube can passivate with the oxidant, a tough and dense chromium-rich oxide protective film is formed on the surface of chromium trioxide (Cr2O3), which effectively prevents the further oxidation reaction from occurring, and the passivation ability of the copper tube is very good. It can cause reflex vomiting and has a strong stimulating effect on the intestinal tract. They are also used as insecticides, which have astringent, irritating, and corrosive effects on the mucous membranes of the human body. Although it can inhibit fungi, it is Bacteria that have poor effects and are poisonous. The main components of the 'cord green' occurring in copper pipes are copper carbonate, copper hydroxide compound, and copper sulfate (cuso4), which are easy to weather and dissolve in water. It is well known that copper pipes are easily corroded to produce verdigris.Ĭopper pipes have the problem of excessive copper, the corrosive bitter and astringent odor caused by the blue-green water caused by corrosion, and the phenomenon of scaling. Such as various brackets, artificial joints, and internal steel nails, etc., and have become standard materials for clean rooms in the semiconductor industry with extremely high cleanliness requirements. Stainless steel is not only used for a long time in the food industry, including beverage, dairy, brewing, pharmaceutical industry, tableware and cookware, and other industries, and has become a standard material for these industries, but also widely used in medical human implants that require high material safety and cleanliness.

It has long been fully proved by the history of successful application of stainless steel in various fields involving human health for decades, and it has become a well-known fact. In fact, stainless steel material itself is safe, non-toxic, and has good cleanliness. The stainless steel water pipe eliminates the problem of 'red water, blue-green water, and hidden water', no peculiar smell, no scaling, no harmful substances precipitation, keeping the water pure and harmless to the human body.ĭecades of practice abroad and laboratory tests in different countries have shown that the precipitation of stainless steel metal elements is more than 5% of the standard value stipulated by the WHO and European drinking water laws (the regulations of all countries in the world refer to these two standards) Low. Therefore, the use of thin-walled stainless steel pipes has greater water flow, smoother water flow, better corrosion resistance, and effectively reduces noise. The equivalent roughness Ks of the inner wall of the tube is 0.00152mm, which is smaller than that of the copper tube. The inner wall of the thin-walled stainless steel tube is smooth and clean after internal and external finishing treatment. Metal pipes should be used to transport hot water.

The average thermal expansion coefficient of thin-walled stainless steel pipes is 0.017mm/(m℃), which is close to copper pipes.  Comparison of thermal expansion coefficient: Whether it is the thickness of the insulation layer, the construction and maintenance costs of the thermal insulation structure, etc., thin-walled stainless steel pipes have good economic efficiency. Thin-walled stainless steel pipes are especially suitable for hot water transportation due to their good thermal insulation performance. The thermal conductivity of thin-walled stainless steel pipe is 15 W/m℃ (100℃), which is 1/4 of carbon steel pipe and 1/23 of copper pipe. Therefore, thin-walled stainless steel pipes can be thinner than copper pipes (0.6MM), which conforms to the national industrial policy of saving materials, has the guarantee of strength, and can achieve the purpose of reducing the weight of buildings. Take the commonly used thin-walled stainless steel pipe of 304 material as an example, its tensile strength is 530-750Mpa, which is twice that of galvanized pipe and three times that of copper pipe. Now compare the materials in terms of physical properties, sanitary properties, corrosion resistance, and economic value.

Comparison of copper pipes and stainless steel pipes

Stainless steel pipe