Identification method of stainless steel seamless steel pipe

Seamless steel pipe. DN219*6 indicates the nominal diameter.

219mm seamless steel pipe with wall thickness of 6mm.

dn stands for nominal diameter, nominal diameter, also known as average outer diameter. Refers to a standardized diameter series of vessels, pipes, and their accessories. The use of nominal diameter is conducive to the standardization of parts, and is also convenient for design, manufacturing, repair and management, and reduces manufacturing costs.

For pipes, it is expressed by a size that is smaller than the outer diameter and larger than the inner diameter. Corresponding to a certain nominal diameter of the pipe, its outer diameter is a certain value, and the inner diameter varies with the wall thickness.

The specification of seamless steel pipes is usually expressed using two parameters: outer diameter (OD) and wall thickness (WT). Normally, the specifications of seamless steel pipes can be expressed in the following way: OD x WT.

For example, a seamless steel pipe has a long hand grip of 6 meters, an outer diameter of 60 mm, and a wall thickness of 5 mm. Then its specification is 60 x 5, or abbreviated as 60*5.

In addition, in some special cases, it will also supplement the material of the steel pipe, the processing technology, the standard and other information. For example, the specification of API 5L X65 PSL2 seamless steel pipe is expressed as: X mm (API 5L X65 PSL2 .

Among them, "API 5L" represents the standard name of the American Petroleum Institute, X65 represents the high strength level of the steel pipe, PSL2 represents the grade requirements, is the outer diameter of the steel pipe, and mm is the wall thickness of the steel pipe.

Compared with solid steel, seamless stainless steel pipe is slightly inferior in terms of bending and twisting resistance, but seamless stainless steel pipe has an empty circular or other shape section in the middle, and the weight is relatively light, which is a more economical steel, which is usually used in structural components or mechanical parts in the manufacturing industry. For example, the transmission bearings of automobiles in our lives, the steel tripods in the construction process, and the drill pipes of oil are all used as manufacturing parts by using seamless stainless steel pipes. This seamless steel pipe is often referred to as stainless steel seamless steel pipe for structural use.

The stainless steel seamless steel pipe for structure adopts GB T14975 1994 standard, which is widely used in petroleum, chemical industry, machining and other fields. Because the two ends of the seamless stainless steel pipe presented by the hollow is usually in the form of a circle, in general, in the case of the same circumference, the seamless stainless steel pipe port presents the largest circular area, usually in life practice will use the round pipe to transport liquids and the like, we will transport water, oil and other liquid steel pipes called fluid transportation seamless steel pipes, fluid transportation seamless steel pipes are used in GB T8163 2008 international standard.

The port of seamless stainless steel pipe is of other shapes, which is generally called special-shaped seamless stainless steel pipe. Due to the different shapes and specifications of the cross-sectional area of the steel pipe, some of the outer wall thickness and wall thickness of the seamless stainless steel pipe have relatively strong points of bending and anti-twisting ability.

Seamless stainless steel pipe round pipe in the use of the process will definitely have some limitations, if the balance digging pressure bending, the round pipe can not be compared with the square or rectangular pipe more compressive and bending performance, so according to different functions and uses to manufacture different seamless stainless steel pipes. For example, we do not use low, medium and high pressure boilers in life, and the structural structure of low, medium and high pressure boilers is seamless stainless steel tubes, but the specifications of seamless steel pipes used in low- and medium-pressure boilers are B3087 2008, and the specifications and standards used for seamless steel pipes for high-pressure boilers are GB5310 2008. According to different functions and uses, the standards of seamless stainless steel pipes are also different.

Through the above introduction, do you have a certain understanding of seamless stainless steel pipes?

dn - nominal diameter.

Outer diameter large outer diameter series.

dn15-ф22mm

dn20-ф27mm

dn25-ф34mm

dn32-ф42mm

dn40-ф48mm

dn50-ф60mm

dn65-ф76(73)mm

dn80-ф89mm

dn100-ф114mm

dn125-ф140mm

dn150-ф168mm

dn200-ф219mm

dn250-ф273mm

dn300-ф324mm

dn350-ф360mm

dn400-ф406mm

dn450-ф457mm

dn500-ф508mm

dn600-ф610mm

Small outer diameter series.

dn15-ф18mm

dn20-ф25mm

dn25-ф32mm

dn32-ф38mm

dn40-ф45mm

dn50-ф57mm

dn65-ф73mm

dn80-ф89mm

dn100-ф108mm

dn125-ф133mm

dn150-ф159mm

dn200-ф219mm

dn250-ф273mm

dn300-ф325mm

dn350-ф377mm

dn400-ф426mm

dn450-ф480mm

dn500-ф530mm

dn600-ф630mm

Generally speaking, the diameter of the tube can be divided into outer diameter, inner diameter, and nominal diameter.

The specifications of stainless steel seamless pipe manufacturer are as follows: GB T14976-94 Stainless Steel Seamless Steel Pipe for Fluid Transportation, GB T14975-94 Stainless Steel for Structure.