Stainless steel rectangular pipe is a hollow steel strip, a large number of channels for transporting fluids such as oil, gas, water, gas, steam, etc. In addition, ,it has light weight when in the same of bending, torsional strength, so it is widely used in the manufacture mechanical parts and engineering structures. Also used in producing all kinds of conventional weapons, the barrel, shells and so on.
Stainless steel rectangular pipe Categories: Seamless and welded steel pipe points (with seam tube) into two categories. It can be divided into tube and shaped tubes according to cross-section shape, round steel is widely used, but there are some square, rectangular, semi-circular, hexagon, equilateral triangle, octagon and other special-shaped pipe.
For the steel pipe to withstand fluid pressure should be conducted to test the pressure of hydraulic capacity and quality, at the required pressure is not leaking, wet or expansion, compliant in some steel  but also according to standards or requirements for crimping demand-side test , flaring test, flattening tests.
Seamless stainless steel pipe, also known as stainless steel seamless pipe, solid steel or ingot is made of capillary through perforated pipes, and then by hot rolling, cold rolling or cold call. Specifications of seamless steel pipe is expressed as outer diameter * thickness mm numbers.
The full name of 304 stainless steel pipe is SUS304 stainless steel pipe
SUS304 stainless steel pipe belongs to the material of the United States grades of stainless steel pipe,  the domestic brands is the equivalent to 0Cr19Ni9 stainless steel pipe ,usually 0Cr18Ni9 replaced.
The mechanism of anti-rust stainless steel is alloy elements formed a dense oxide film, cut off from contact with oxygen, to prevent any further oxidation. So stainless steel is not a "stainless."

304 rust phenomenon occurs, there may be several reasons:
1. Use of chloride ions present in the environment.
Chloride ions is widespread, such as salt, sweat track, water, wind, soil and so on. Stainless steel will rust quickly in the environment of the presence of chloride ions in the environment, even more quickly than ordinary mild steel.
Therefore, it has requirements of the use of stainless steel environment, and required frequent cleaning to remove dust and maintain clean and dry.
316 and 317 stainless steel ( as follow of 317 stainless steel performance) is a stainless steel containing molybdenum.

The molybdenum content of 317 stainless steel is higher than 316 stainless steel.  Because of molybdenum in the steel, the properties of 317 stainless steel is better than 310 and 304 stainless steel. Under high temperature conditions, when the sulfuric acid concentration lower than 15% and higher than 85%, 316 stainless steel has a wide range of uses. 316 stainless steel has good corrosion properties of the chloride, it is common used for the marine environment.
With the social and economic development, the application of stainless steel pipe has also been more and more popular. Will certainly bring a new change in all areas.
Theoretical weight of stainless steel pipe: W = diameter - wall thickness x wall thickness x0.02491stainless steel pipe way to memorize operator OD - Wall Thickness x Wall Thickness x0.02491.