321 Stainless steel seamless steel pipe

Seamless Steel Pipe is a kind of hollow long round steel, which is widely used in industrial transmission pipelines and mechanical structural components such as petroleum, chemical industry, medical treatment, food, light industry, machinery and instruments, etc. In addition, when the bending and torsional strength are the same, the weight is light, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also commonly used as furniture, kitchenware, etc.

Classification:

According to the different manufacturing process can be: hot rolling, extrusion, cold drawing and cold rolling these basic types, according to the section shape can be divided into round pipe and irregular pipe, widely used is the circular steel pipe, but there are also some square, rectangular, semicircle, hexagonal, equilateral triangle, octagonal shaped Seamless Steel Pipe.

For the steel pipe under fluid pressure to carry out hydraulic test to test its pressure capacity and quality, under the specified pressure does not leak, wet or expansion to qualify, some steel pipe also according to the standard or demander requirements for rolling test, flaring test, flattening test.

304 Seamless Steel Tube full name SUS304 stainless steel tube, SUS304 stainless steel tube belongs to the United States grade of stainless steel tube, the domestic grade equivalent to 0Cr19Ni9 stainless steel tube, usually replaced by 0Cr18Ni9. The mechanism of stainless steel rust prevention is that alloying elements form a dense oxide film to isolate oxygen contact and prevent continued oxidation. So stainless steel is not "rust free".