Many people know about 304 stainless steel. This is a f […]
Many people know about 304 stainless steel. This is a food grade stainless steel. Many kitchen products are made of 304 stainless steel. What are the characteristics of 304 stainless steel as food grade stainless steel? Why does China Stainless Steel Sink use 304 stainless steel?
Stainless steel tubing has the longest life. From the analysis of the use of stainless steel abroad, the service life of stainless steel water pipes can reach 100 years, at least 70 years, as long as the life of buildings.
2, corrosion resistance
One of the most outstanding advantages of stainless steel tubing is its excellent corrosion resistance, which is the best among all kinds of tubing. Because stainless steel can passivate with the oxidant, a tough and dense chromium-rich oxide protective film Dr2O3 is formed on the surface, which effectively prevents the further oxidation reaction. Other metal pipes, such as galvanized water pipes and copper pipes, have little passivation ability. This is the key reason why the corrosion resistance of copper pipes of galvanized pipes is far less than that of stainless steel pipes. Stainless steel does not have uniform corrosion like carbon steel, no need to protect the coating when used; stainless steel water pipes have no restrictions on the chemical composition of water because stainless steel is very good in water with various oxygen content, temperature, pH and hardness. Corrosion resistance; stainless steel water pipes can withstand high flow rates, even at flow rates greater than 40 m / s, still maintain a very low corrosion rate, no more than 0.003 mm / year, especially suitable for high-rise water supply. Stainless steel generally does not undergo local corrosion. 304 stainless steel can withstand up to 200 ppm of chloride and 316 stainless steel can withstand up to 1000 ppm of chloride. This conclusion is based on exposure data and has been proven by experience. The coefficient of thermal expansion of the stainless steel tube is similar to that of the copper tube, which is 1.5 times that of the ordinary steel tube. Compared with the stainless steel tube, it has the characteristics of slow expansion and contraction.
3, heat and insulation
The thermal conductivity of stainless steel pipes is 1/25 of that of copper pipes, which is 1/4 of ordinary steel pipes and is especially suitable for hot water transportation. The most commonly used stainless steels in the water industry are 316 and 304 stainless sheets of steel, which are suitable for most water treatment and storage conditions.
The tensile strength of 304 stainless steel pipe is twice that of steel pipe and 8~10 times that of plastic pipe. The strength of the material determines whether the water pipe is strong and crash resistant, safe and reliable. Safety and reliability are the most important requirements for building water supply. In the case of an impact by an external force, the possibility of leakage of stainless steel water pipes is extremely small. The working pressure of the high-rise water supply system is generally greater than 0.6Mpa; the pressure on pipes is higher. Due to its excellent mechanical properties, thin-walled stainless steel pipes can withstand high water supply pressures up to 10Mpa, which is especially suitable for high-rise water supply.