Steel Pipe Model Specification Table What is the national standard?

National standard steel pipe implementation standard:

1. Seamless steel pipe for structure.

gb8162-2008

2. Ground seam steel pipe for conveying fluid: GB8163-20083, seamless steel pipe for boiler: GB3087-20084, high-pressure seamless pipe for boiler.

GB5310-2008 (type).

5. High-pressure seamless steel pipe for fertilizer equipment: GB6479-19996, seamless steel pipe for geological drilling: YB235-70

7. Seamless steel pipe for oil drilling: YB528-65

8. Seamless steel pipe for petroleum cracking: GB9948-889, seamless pipe for oil drill collar: YB691-70

10. Seamless steel pipe for automobile half shaft: GB3088-199911, seamless steel pipe for ship: GB5312-199912, cold drawn and cold rolled.

Precision seamless steel pipe: GB3639-1999

13. Various alloy tubes 16Mn, 27Simn, 15CrMo, 35CrMo, 12CrMoV, 20G, 40Cr, 12Cr1MoV, 15CrMo.

Answer; National standard implementation standards; Steel Pipes, Precision Pipes, Precision Steel Pipes, Alloy Pipes, Alloy Steel Pipes

1. Seamless steel pipe for structure: GB8162-20082, steel pipe with ground seam for conveying fluid: GB8163-20083, seamless steel pipe for boiler:

GB3087-20084, high-pressure seamless pipe for boiler: GB5310-2008 (type) 5, high-pressure seamless steel pipe for fertilizer equipment: GB6479-19996, seamless steel pipe for geological drilling:

yb235-70

7. Seamless steel pipe for oil drilling: YB528-65

8. Seamless steel pipe for petroleum cracking: GB9948-889, seamless pipe for oil drill collar: YB691-70

10. Seamless steel pipe for automobile half shaft: GB3088-199911, seamless steel pipe for ship: GB5312-199912, cold-drawn cold-rolled precision seamless steel pipe: GB3639-1999<>

Answer; Precision Tubes, Precision Steel Tubes, Alloy Tubes, Alloy Steel TubesIn addition to general steel pipes, low and medium pressure boiler steel pipes, high-pressure boiler steel pipes, alloy steel pipes, stainless steel pipes, petroleum cracking pipes, and other steel pipes, it also includes carbon thin-walled steel pipes, alloy thin-walled steel pipes, stainless thin-walled steel pipes, and special-shaped steel pipes. The outer diameter of the hot-rolled seamless pipe is generally greater than 32mm, the wall thickness, the diameter of the cold-rolled seamless steel pipe can be up to 6mm, the wall thickness can be reached, the outer diameter of the thin-walled pipe can be up to 5mm, the wall thickness is less than, and the cold-rolled has higher dimensional accuracy than hot-rolled.

The commonly used steel pipe sizes are:

Steel pipes are divided into seamless steel pipes and welded steel pipes. The seamless steel pipe production process is to thread a solid tube blank or steel ingot into a hollow capillary, which is then rolled into a steel pipe of the required size. The different methods of perforation and rolling are used to produce seamless steel pipes.

The production process of welded steel pipe is to bend the pipe blank (steel plate or strip) into a tube, and then weld the gap to form a steel pipe. Due to the different forming and welding methods used, different methods for the production of welded steel pipes are constituted.

The steel pipe size specification table can refer to GB T 28708-2012 "Seamless and welded steel pipe size selection regulations for pipeline engineering", which stipulates the size series and theoretical quality of carbon steel, alloy steel, stainless steel seamless steel pipe and welded steel pipe used in pipeline engineering.

<> Usual length: Where the length is within the length range specified in the standard and there is no fixed length requirement, it is called the usual length. For example, the structural pipe standard states:

hot-rolled (extruded, expanded) steel pipe 3000mm 12000mm; Cold-drawn (rolled) steel pipe 2000mmm 10500mm.

Cut-to-length length: Within the normal length range, it is a fixed length size required in the contract. However, in practice, it is not possible to cut out the length of the cut-to-length in practice, so the standard stipulates the allowable positive deviation value for the length of the cut-to-length length.

Steel pipe according to the profile shape:Equal-section steel pipes and variable section steel pipes. Variable section (or variable section) steel pipe refers to the steel pipe with periodic or non-periodic changes in the cross-sectional shape, inner and outer diameter and wall thickness along the length of the pipe.

The main ones are: outer conical pipe, inner conical pipe, outer stepped pipe, inner stepped pipe, periodic section pipe, bellows, spiral pipe, steel pipe with heat sink and gun barrel with double line.

The above content reference: Encyclopedia - Steel Pipe.

FRP pipe specifications and models tell you how to choose.

The specifications of steel pipes are: such as 4 pipes, 6 pipes, 1 inch pipes, 2 inch pipes and so on.

According to different models and specifications, its wall thickness is also different, and there will be a variety of wall thicknesses for consumers to choose from for the same model and specification of steel pipes. For example, 4 pipes, wall thickness and other models, the thicker the steel pipe, the higher the strength, the more expensive and more expensive, users need to buy according to the truth.

How to buy steel pipes:

1. Look at the surface of the steel pipe.

When consumers buy steel pipes, they need to carefully look at the surface of the steel pipe, whether it is shiny, and whether the color distribution is uniform, and at the same time, they also need to touch the pipe wall with their hands to see whether the pipe wall is smooth and flat. If the color distribution of the steel pipe is uneven, or the pipe wall is rough, it means that the quality of the steel pipe is not good, and even its performance will be affected, so it is not recommended to buy.

2. Look at the steel pipe certificate.

All regular brand steel pipes will be accompanied by relevant quality inspection certificates, certificates of conformity and factory test reports. When purchasing, consumers need to ask the merchant to show all the documents of the steel pipe to ensure the quality of the steel pipe, if the merchant can not provide these materials, then the quality of the steel pipe is not guaranteed, it is recommended not to buy.

3. Look at the brand of steel pipe.

There are many different brands of steel pipes on the market, and consumers are best to find well-known brands to buy when purchasing. Because the steel pipe that looks the same on the surface, the raw materials used in the products are very different, and if you choose poor raw materials, its performance and quality will be much worse.

Steel pipe models and specifications:

Large Outer Diameter Series, Specification, DN-Nominal Diameter, Outer Diameter.

dn10—ф14mm，dn15—ф18mm，dn20—ф25mm，dn25—ф32mm，dn32—ф38mm；

dn40—ф45mm，dn50—ф57mm，dn65—ф76mm，dn80—ф89mm，dn100—ф108mm；

dn125—ф133mm，dn150—ф159mm，dn175—ф194mm，dn200—ф219mm，dn225—ф；

245mm，dn250—ф273mm， dn300—ф325mm，dn350—ф377mm，dn400—ф426mm；

dn450—ф480mm。

There are many models and specifications of steel pipes, and only some of the common types and standards are listed below:

1.Alloy structural steel pipes: 15CrMo, 12Cr1MoV, 35CrMo, Cr5Mo, etc.

2.Carbon structure steel pipe: 20, Q235B, Q345B, ST52, etc.

3.Stainless steel pipes l, etc.

4.High pressure boiler tubes: 20g, 16mn, 15crmog, 12cr1movg, etc.

5.Hydraulic strut pipe: 27SIMN, SAE1026, etc.

6.Petroleum cracking seamless steel pipe: 10, Wang Qing 20, API 5L, etc.

7.White iron pipe: SPCC, SPHC, etc.

The main standards are GB T 8162, GB T 8163, GB T 3087, GB T 5310, GB T 6479, ASTM A106, ASTM A213, ASTM A312, etc.

In practical applications, various factors need to be considered when selecting steel pipe models and specifications, such as the ambient temperature, pressure, media type, and so on. At the same time, when purchasing steel pipes, it is also necessary to pay attention to product quality, brand reputation, after-sales service and other factors before hail.

The average carbon content of 20a is.

The average carbon content of 25a is .

The word "A" (or "high") is added after the steel number to represent high-grade high-quality alloy steels with low sulfur and phosphorus content (S<=, P<=. The wall thickness of KGB pipe is very different from JDG, except for the wall thickness of 16, all the rest are related to the wall thickness of the pipe and the size of the pipe. There are also those greater than 16, and there are even more.

The steel pipe specifications generally have a series of spiral steel pipes with a nominal diameter of mm, and the selection range of rebar sizing is 6 12m. Steel pipes are not only used to transport fluids and powdery solids, exchange heat energy, and make mechanical parts and containers, it is also an economical steel.