Stainless steel rectangular tube/pipe:

Introduction：

The stainless steel rectangular tube is a hollow long steel material, which is widely used as a pipeline for transporting fluids, such as oil, natural gas, water, gas, steam, etc. In addition, when the bending and torsional strength are the same, the weight is light, so It is also widely used to manufacture mechanical parts and engineering structures.

Steel pipes are divided into seamless steel pipes and welded steel pipes (seam pipes). According to the shape of the section, it can be divided into round pipe and special-shaped pipe. Round steel pipes are widely used, but there are also some square, rectangular, semi-circular, hexagonal, equilateral triangle, octagonal and other special-shaped steel pipes.

For the steel pipes that are under fluid pressure, hydraulic tests are required to check their pressure resistance and quality. No leakage, wetting, or expansion under the specified pressure is qualified. Some steel pipes also need to be subjected to a curling test according to the standard or the requirements of the purchaser. , Flaring test, flattening test, etc.

Seamless stainless steel pipes, also called stainless steel seamless pipes, are made of steel ingots or solid tube blanks through perforations to form capillary tubes, which are then hot rolled, cold rolled or cold dialed. The specification of seamless steel pipe is expressed by the outer diameter * wall thickness in millimeters.

classification:

304 stainless steel pipe

Full name SUS304 stainless steel pipe

SUS304 stainless steel pipe is a stainless steel pipe made of American grade material. The domestic grade is equivalent to 0Cr19Ni9 stainless steel pipe, usually replaced by 0Cr18Ni9.

The mechanism of stainless steel rust prevention is that alloy elements form a dense oxide film, which isolates oxygen from contact and prevents further oxidation. So stainless steel is not “stainless”.

The rust phenomenon of 304 material may have the following reasons:

1. There are chloride ions in the environment.

Chloride ions are widespread, such as salt, sweat, sea water, sea breeze, soil and so on. Stainless steel corrodes quickly in the presence of chloride ions, even more than ordinary low carbon steel.

Therefore, there are requirements for the use environment of stainless steel, and it is necessary to wipe frequently to remove dust and keep it clean and dry.

316 and 317 stainless steel

(The performance of 317 stainless steel is shown later) It is a kind of molybdenum containing stainless steel. The content of molybdenum in 317 stainless steel is slightly better than that of 316 stainless steel. Due to the molybdenum in steel, the overall performance of this steel is better than that of 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 properties of chloride attack, so it is usually used in the marine environment.

With the development of social economy, the application of stainless steel pipes has also been more and more widely popularized. It will surely bring a whole new improvement in various fields.

Theoretical weight of stainless steel pipe: W = outer diameter-wall thickness x wall thickness x 0.02491 The calculation method of stainless steel pipe outer diameter-wall thickness x wall thickness x 0.02491

Production Process:

Production process of stainless steel pipe

1. Round steel preparation; b. Heating; c. Hot rolled piercing; d. Head cutting; e. Pickling; f. Grinding; g. Lubrication; h. Cold rolling; i. Skim; j. Solution heat treatment; k. Straightening; l. Cut the tube; m. Pickling; n. Product testing.