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Application of 304 stainless steel pipe in drinking water pipe

Author:     Date: March 13, 2019    Source:    Focus on:

Code for design of building water supply and drainage GB50015-2003)5.7.6   Clear It is pointed out that the thin-walled stainless steel pipe, thin-wall copper pipe and high-quality plastic pipe should be selected for drinking water pipe with corrosion resistance, smooth inner surface and food grade hygiene requirements.

 

304 stainless steel is a kind of universal stainless steel material. The chemical grade of 304 stainless steel is

 

06Cr19Ni10 , containing chromium 19%, containing 8-10% nickel. three hundred and four   Corrosion resistance ratio of stainless steel two hundred   system The stainless steel material of the column should be strong. High temperature resistance is also good, the general use temperature limit is less than 650 ℃.

 

therefore three hundred and four   Stainless steel is widely used in life, such as some high-grade stainless steel meals Stainless steel drinking water pipes, outdoor stainless steel railings, etc. three hundred and four   Stainless steel is approved by the state Food grade stainless steel.

 

Meeting national standards three hundred and four   The surface of stainless steel tube has a dense passivation oxidation layer Therefore, the membrane has high corrosion resistance, and the damaged membrane can use oxygen in the atmosphere or water Auto repair. So, three hundred and four   Stainless steel pipe can adapt to all kinds of water quality, including soft water It is widely used.

 

three hundred and four   Stainless steel has excellent stainless steel corrosion resistance and intergranular corrosion resistance. For oxidizing acid, the concentration of In nitric acid ≤ 65% and temperature ≤ 100 ℃, 304 Stainless steel has strong corrosion resistance. It is also suitable for alkali solution and most organic and inorganic acids Good corrosion resistance. At the same time, it can withstand high velocity even if the velocity reaches 30m/s,


Its annual corrosion rate is still at 003mm / year. However, stainless steel and iron and other metal with potential difference should be insulated to prevent electrochemical corrosion.

 

Stainless steel materials have certain restrictions on chloride ion corrosion. It is suggested that stainless steel pipes with different materials should be selected in the following environment with different chloride ion concentration.

1)   The chloride ion in tap water is less than 50ppm Stainless steel is recommended 201;

 

2)   The chloride ion in tap water is more than 50-100ppm Stainless steel is recommended 304;

 

3)   The chloride ion in tap water is more than 100-200ppm Stainless steel is recommended 304L;

 

4)   Chlorine ion in tap water is more than 200-250ppm Stainless steel is recommended 316;

 

5)   The chloride ion in tap water is more than 250PPM Duplex stainless steel is recommended 2205。

 

In general, the concentration of residual chlorine in tap water is 0 0.6mg/L   about (1mg / L = 1ppm here), much lower than   Therefore, in the urban tap water as the living water source In buildings, the three hundred and four   The stainless steel pipe as a water supply pipe meets the requirements.

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