Stainless steel pipe
What is stainless steel pipe?
Stainless steel pipe is a long steel strip with a hollow cross-section, non-magnetic, and usually used as a pipeline for conveying fluids.
It is widely used in industrial pipelines such as petroleum, chemical, medical, food, light industry, mechanical instruments, and mechanical structural components. In addition, when the bending and torsional strengths are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also commonly used to produce various conventional weapons, gun barrels, shells, etc.
The full name of the common 304 stainless steel pipe is SUS304 stainless steel pipe. SUS304 stainless steel pipe belongs to the American grade stainless steel pipe. The domestic grade in China is equivalent to 0Cr19Ni9 stainless steel pipe, which is usually replaced by 0Cr18Ni9.
Characteristics of stainless steel pipe
Stainless steel seamless pipe is a steel pipe that is resistant to corrosion by weak corrosive media such as air, steam, and water, and chemically corrosive media such as acids, alkalis, and salts. It is also called stainless acid-resistant steel pipe.
The corrosion resistance of stainless steel pipes depends on the alloying elements contained in the steel.
Stainless steel air duct
Stainless steel air duct
Chromium is the basic element that makes stainless steel corrosion-resistant. When the chromium content in steel reaches about 12%, chromium reacts with oxygen in the corrosive medium to form a very thin oxide film (self-passivation film) on the surface of the steel, which can prevent further corrosion of the steel matrix.
In addition to chromium, the commonly used alloying elements for stainless steel seamless pipes include nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of stainless steel organization and performance for various uses.
Stainless steel pipe classification
Stainless steel pipes can be divided into stainless steel seamless pipes and stainless steel welded pipes according to the production process, like ordinary steel pipes, according to the shape, they can be divided into round pipes and special-shaped pipes (square pipes, rectangular pipes, semi-circular pipes, etc.), according to the rolling method, they can be divided into hot-rolled, hot-extruded and cold-drawn (rolled) stainless steel pipes, etc.
Special-shaped pipe
Round tube
According to the different metallographic structures of stainless steel, stainless steel pipes can be divided into semi-ferrite and semi-martensitic stainless steel pipes, martensitic stainless steel pipes, austenitic stainless steel pipes, austenitic-ferritic stainless steel pipes, etc.
Application of stainless steel pipe
Stainless steel pipes are safe, reliable, hygienic, environmentally friendly, economical and applicable. The successful development of thin-walled pipes and new reliable, simple and convenient connection methods have given them many irreplaceable advantages over other pipes. Their application in engineering is very popular and has a good prospect.
Stainless steel pipe weight calculation formula
| Steel type | Density | Calculation formula | |
| 0Cr18Ni9 | 00Cr19Ni10 | 7.93 | kg/m = 0.02491 * [(Outer diameter – Wall thickness) * Wall thickness] |
| SUS304 | SUS304L | ||
| TP304 | TP304L | ||
| 0Cr17Ni2Mo2 | 00Cr17Ni14Mo2 | 7.98 | kg/m = 0.02507 * [(Outer diameter – Wall thickness) * Wall thickness] |
| SUS316 | SUS316L | ||
| TP316 | TP316L | ||
Scope of delivery
Seamless pipe specifications
Minimum outer diameter 6mm, maximum 762mm
Minimum wall thickness 1mm, maximum 40mm
Welded pipe specifications
Minimum outer diameter 12.7mm, maximum 4800mm
Minimum wall thickness 1mm, maximum 50mm
Common standards for stainless steel pipes
| Standard | Application |
| ASTM A213 | Ferritic and austenitic alloy steel seamless pipes for boilers and heat exchangers |
| ASTM A269 | Austenitic stainless steel seamless and welded pipes for general use |
| ASTM A312 | Austenitic stainless steel seamless pipes, welded pipes, welded pipes |
| ASTM A450 | General requirements for carbon steel, ferritic and austenitic alloy steel pipes |
| ASTM A530 | General requirements for ferritic and alloy steels for special purposes |
| ASTM A789 | General requirements for carbon austenitic stainless steel seamless and welded pipes |
Stainless steel pipe and fittings Manufacturers
Special-shaped pipe
Round tube
Whether it is carbon steel pipe, galvanized pipe, or stainless steel pipe, it plays a vital role in today’s industry, construction, aviation and other fields. There are many foreign trade merchants in the market. How to choose a trader? Many people want to choose a cheap one because of limited funds. This is normal. When comparing prices, you must keep your eyes open. You must not choose a much cheaper one, because there is a 10,000% problem with this kind of merchant. This is the summary of the blood and tears of customers.
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