Rectangular seamless steel pipe, semi-circular seamless steel pipe, hexagonal seamless steel pipe

200：

16*2

300：

76*3

400：

108*4.5

Classification of pipes: Steel pipes are divided into two categories: seamless steel pipes and welded steel pipes (seamed pipes). According to the cross-sectional shape, it can be divided into round pipes and special-shaped pipes. The most widely used are circular steel pipes, but there are also some special-shaped steel pipes such as square, rectangular, semi-circular, hexagon, equilateral triangle, octagon and so on. Material coverage ( ) The anti-rust mechanism of stainless steel is that alloy elements form a dense oxide film, which isolates oxygen contact and prevents continued oxidation. So stainless steel is not stainless.
There may be several reasons why stainless steel materials rust.
There are chloride ions in the use environment.
Chloride ions exist widely, such as salt, sweat, sea water, sea breeze, soil, etc. Stainless steel corrodes very quickly in the presence of chloride ions, even more than ordinary low carbon steel.
Therefore, there are requirements for the environment in which stainless steel is used, and it needs to be wiped frequently to remove dust and keep it clean and dry.
No solid solution treatment?
The alloy elements are not dissolved into the matrix, resulting in low alloy content in the matrix structure and poor corrosion resistance. ?
Innate intergranular corrosion?
This material, which does not contain titanium and niobium, is prone to intergranular corrosion. Adding titanium and niobium, coupled with stabilization treatment, can reduce intergranular corrosion.
When rust stains appear on stainless steel instant noodles, they can be cleaned with % nitric acid or abrasive detergent, or they can be cleaned with special detergents.
Wuxi Chengjiu Metal spot resources:
Stainless steel round tube: **
Stainless steel oval tube: **
Stainless steel square tube: **
Stainless steel rectangular tube: * *
Stainless steel weight calculation formula
Commonly used: material/(diameter wall thickness) wall thickness length weight
material/(diameter wall thickness) wall thickness length weight
Unit
Examples of stainless steel pipe markings: Steel pipes made of r and delivered in a heat-treated state have an outer diameter of , a wall thickness of , a fixed length of , and a dimensional accuracy of ordinary grade, and are marked **B/.
Manufactured by r, steel pipes delivered in a heat-treated state have an outer diameter of , a wall thickness of , a fixed length of , and a high dimensional accuracy, and are marked as high **B/.