Classification of stainless steel pipe: stainless steel seamless steel pipe and stainless steel welded steel pipe (welded steel pipe) the basic two categories. According to the outer diameter shape of the steel pipe can be divided into round pipe and shaped pipe, widely used is round steel pipe, but there are also some square, rectangular, semicircular, hexagonal, equilateral triangle, octagonal and other shaped steel pipe.
For the steel pipe under fluid pressure should be hydraulic test and X-ray testing to test its pressure resistance and quality, in the specified pressure does not leak, wet or expansion qualified, some steel pipe also according to the standard or the requirements of the demander flange test, flaring test, flattening test, etc.
Seamless stainless steel pipe, also known as stainless steel seamless pipe, is made of steel ingot or solid tube blank perforated into a tube, and then made of hot rolled, cold rolled or cold drawn. The specifications of the seamless steel pipe are expressed by the outer diameter * the wall thickness of millimeters.
304 stainless steel pipe full name SUS304 stainless steel pipe.
SUS304 stainless steel pipe belongs to the American grade of stainless steel pipe, the domestic grade is equivalent to 0Cr19Ni9 stainless steel pipe, usually replaced by 0Cr18Ni9.
The mechanism of stainless steel rust prevention is that the alloying elements form a dense oxide film to isolate oxygen contact and prevent continued oxidation. So stainless steel is not "stainless".
304 material rust phenomenon, there may be the following reasons:
1. Chloride ions exist in the environment.
Chloride ions are widely present, such as salt, sweat, sea water, sea breeze, soil and so on. Stainless steel in the presence of chloride ions in the environment, corrosion quickly, even more than ordinary mild steel.
Therefore, there are requirements for the use of stainless steel environment, and it is necessary to wipe frequently, remove dust, and keep clean and dry.
316 and 317 stainless steel (317 stainless steel properties see below) are molybdenum containing stainless steel. The molybdenum content of 317 stainless steel is slightly higher than that of 316 stainless steel. Due to the molybdenum in the steel, the overall performance of the steel is better than 310 and 304 stainless steel, under high temperature conditions, when the concentration of sulfuric acid is lower than 15% and higher than 85%, 316 stainless steel has a wide range of uses. 316 stainless steel also has good chloride erosion properties, so it is usually used in Marine environments.
With the development of social economy, the application of stainless steel pipe has also been more and more widely popularized. Will bring new changes in every field.
Theoretical weight of stainless steel pipe: W= outer diameter - wall thickness x wall thickness x0.02491.
Since the invention of stainless steel at the beginning of this century, stainless steel has integrated the image of modern materials and the reputation of excellence in architectural applications, making its competitors envious. Stainless steel does not cause corrosion, pitting, rust or wear. Stainless steel is also one of the materials with high strength in building metal materials. Because stainless steel has good corrosion resistance, it enables structural components to maintain the integrity of the engineering design. Chromium stainless steel also combines mechanical strength and high extensibility, and is easy to process and manufacture parts to meet the needs of architects and structural designers.