Seamless pipes by applications

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries.

Seamless pipes find applications across various industries and sectors due to their strength, durability, and reliability. Here are some common applications of seamless pipes categorized by industry:

What is a seamless pipe used for?

Seamless pipes are commonly used in various industries for different applications. Here are some of the main uses of seamless pipes:

  1. Oil and Gas Industry: Seamless pipes are extensively used in the oil and gas industry for transporting fluids such as crude oil, natural gas, and petroleum products. They are capable of withstanding high-pressure and high-temperature conditions, making them suitable for oil and gas exploration, production, and transportation.
  2. Petrochemical Industry: Seamless pipes find applications in the petrochemical industry for transporting chemicals, gases, and other hazardous substances. They are resistant to corrosion and can handle aggressive media, making them ideal for petrochemical plants and refineries.
  3. Power Generation: Seamless pipes are used in power plants for various applications, including steam pipelines, boiler tubes, and turbine piping. They can withstand high temperatures and pressures, making them suitable for power generation through thermal and nuclear processes.
  4. Automotive Industry: Seamless pipes are used in the automotive industry for manufacturing exhaust systems, fuel injection systems, and hydraulic lines. They provide excellent dimensional accuracy, strength, and resistance to corrosion, ensuring efficient and reliable performance in automotive applications.
  5. Construction and Infrastructure: Seamless pipes are used in construction projects for various applications, including structural support, water supply systems, sewage systems, and underground pipelines. They offer high strength and durability, ensuring long-lasting and reliable infrastructure.
  6. Mechanical and Engineering Applications: Seamless pipes are widely used in mechanical and engineering applications, such as machinery, equipment, and tool manufacturing. They are used for conveying fluids, gases, and solids in various industries, including manufacturing, aerospace, and defense.
  7. Heat Exchangers and Boilers: Seamless pipes are utilized in heat exchangers and boilers for efficient heat transfer. They are suitable for carrying hot fluids and steam at high temperatures and pressures, making them essential components in industries such as power generation, chemical processing, and HVAC systems.

It's important to note that the above applications are just a few examples, and seamless pipes have a wide range of uses in many other industries and sectors where reliable and efficient fluid transportation is required.

Main products and application

Steel Grade Standard Application
GB(China) ASME(USA) DIN/EN(Euro) JIS(Jpan)
Carbon steel 10
20
20G
20MnG
25MnG
Q345B/C/D/E
A106
SA-106B
SA-106C
SA-192
SA-210A1
SA-210C
St35.8
St45.8
P235GH
P265GH
STB340
STB410
STB510
Economizer tube Water wall tube, pipeline, header pipe, Petrochemical furnace tube, heat exchange tube
Mo steel 15MoG
20MoG
SA-209 T1
SA-209 T1a
SA-209 T1b
16Mo3 15Mo3
16Mo3
Water wall tube
Superheater tube
Reheater tube
Cr-Mo Steel
Cr-Mo-V steel
12Cr1MoG
12Cr2MoWVTiB
  12Cr1MoV
14MoV63
  Superheater tube
Reheater tube,
Pipeline, Header pipe, Petrochemical furnace tube, Heat exchange tube
Cr-Mo-Steel
Cr-Mo-W Steel
Cr-Mo Steel
Cr-Mo-W steel
12CrMoG
15CrMoG
12Cr2MoG
10Cr9Mo1VNbN
10Cr9MoW2VNbBN
12Cr1Mo
12Cr5Mol/NT
12Cr9Mol/NT
T11/P11
T12/P12
T22/P22
T23/P23
T24/P24
T5/P5
T9/P9
T91/P91
T92/P92
10CrMo5-5
12CrMo4-5
10CrMo9-10
7CrWVMoNb9-6
7CrMoVTIB10-10
X10CrMoVNb9-1
X10CrWMoVNb9-2
X11CrMo5+l/NT
X11CrMo9-1+l/NT
STB20
STB22
STB23
STB24
STB25
STB26
Superheater tube, Reheater tube, Main steam pipe, Pipleline, Header pip, Petrochemical furnace tube, Heat exchange tube
Carbon steel
Ni steel
16MnDG
10MnDG
09DG
A333-1
SA-333-1
A333-6
SA-333-6
A333-3
SA-333-3
  STPL380
STPL450
Tube & pipe for Low-temperature service
Austentic Stainless steel   ---   AP304  TP304H
TP321 TP321H
TP347 TP347H
TP316 TP316H
S30432 TP310HCbN
    ---   Superheater tube
Reheater tube

Dimension tolerances of seamless steel pipe

Pipe types Pipe Szie(mm) Tolerances
Hot rolled OD <50 ±0.50mm
≥50 ±1%
WT <4 ±12.5%
≥4-20 +15%, -12.5%
>20 ±12.5%
Cold drawn OD 6-10 ±0.20mm
10-30 ±0.40mm
30-50 ±0.45
>50 ±1%
WT <1 ±0.15mm
>1-3 + 15%, – 10%
>3 + 12.5%, – 10%

Tolerances on out diameter

For pipe over 10 inches as a special OD tolerance pipe, the OD shall within vary +1% /-1%.

Standard Hot finished seamless tube Cold flnished seamless tube
Out diameter
(mm)
Tolerance Out diameter
(mm)
Tolerance
EN10216-1
EN10216-2
DIN17175
≤100  +/-0.75%
(min.+/-0.5mm)
All  +/-0.5%
(min. +/-0.30mm)
>100  +/-0.90%
GB/T 3087 ≤460  +/-0.75%
(min.+/-0.5mm)
 10-30   +/-0.40mm
>30-50  +/-0.45mm
>50  +/-1.0%
GB/T 5310
GB/T 9948
GB/T 6479
<57  +/-0.40mm ≤30  +/-0.20mm 
 57-325   +/-0.75% >30-50   +/-0.30mm 
>325-460  +1%,-2mm >50  +/-0.8% 
ASME SA-179M
ASME SA-192M
ASME SA-209M
ASME SA-210M
ASME SA-213M
JIS G 3461
JIS G 3461
≤101.6  +0.4, -0.8mm <25.4  +/-0.10mm
>25.4-38.1  +/-0.15mm
>38.1-50.8  +/-0.20mm 
101.6-190.5  +0.4, -1.2mm >50.8-63.5  +/-0.25mm
>63.5-76.2  +/-0.30mm 
>76.2  +/-0.38mm
ASME SA106
ASME SA335
≤48.3  +/-0.40mm  ≤48.3  +/-0.40mm
 48.3-114.3  +/-0.79mm 
114.4-219.1  +1.59, -0.79mm 
219.2-323.9  +2.38, -0.79mm >48.3  +/-0.79mm 
>324  +/-1.0%

Tolerance on dimension

For standard pipe, except as provided for thin-wall pipe, the tolerances of diameter shall be in accordance with the following table:

Standard Hot finished seamless tube Cold flnished seamless tube
Out diameter
(mm)
Tolerance Out diameter
(mm)
Tolerance
EN10216-1
EN10216-2
DIN17175
≤100  +/-0.75%
(min.+/-0.5mm)
All  +/-0.5%
(min. +/-0.30mm)
>100  +/-0.90%
GB/T 3087 ≤460  +/-0.75%
(min.+/-0.5mm)
 10-30   +/-0.40mm
>30-50  +/-0.45mm
>50  +/-1.0%
GB/T 5310
GB/T 9948
GB/T 6479
<57  +/-0.40mm ≤30  +/-0.20mm 
 57-325   +/-0.75% >30-50   +/-0.30mm 
>325-460  +1%,-2mm >50  +/-0.8% 
ASME SA-179M
ASME SA-192M
ASME SA-209M
ASME SA-210M
ASME SA-213M
JIS G 3461
JIS G 3461
≤101.6  +0.4, -0.8mm <25.4  +/-0.10mm
>25.4-38.1  +/-0.15mm
>38.1-50.8  +/-0.20mm 
101.6-190.5  +0.4, -1.2mm >50.8-63.5  +/-0.25mm
>63.5-76.2  +/-0.30mm 
>76.2  +/-0.38mm
ASME SA106
ASME SA335
≤48.3  +/-0.40mm  ≤48.3  +/-0.40mm
 48.3-114.3  +/-0.79mm 
114.4-219.1  +1.59, -0.79mm 
219.2-323.9  +2.38, -0.79mm >48.3  +/-0.79mm 
>324  +/-1.0%

Tolerances on wall thickness

The wall thickness at any point shall be within the below tolerance table.

Standard Hot finished seamless tube Cold flnished seamless tube
Out diameter
OD(mm)
Wall thickness
T(mm)
Tolerance Out diameter
(mm)
Wall Thickness
T(mm)
Tolerance
DIN17175 ≤130 S≤2Sn  +15%, -10%    -- All  +/-10%
(min. +/-0.2mm)
2Sn<S≤4Sn  +12.5%, -10% 
S>4Sn  +-/9%
>130 S≤0.05da  +17.5%, -12.5% 
0.05da<S≤0.11da  +/-12.5% 
S>0.11da  +/-10% 
EN 10216-1
EN 10216-2
 ≤219.1   -    +/-12.5%
(min.+/-0.4mm) 
 --  T/D≤0.025  +/-20% 
0.025<T/D≤0.050  +/-15% 
0.05<T/D≤0.10  +/-12.5% 
0.1<T/D  +/-10% 
GB/T 3087  --  ≤20  +15%,-12.5%
(min.+0.45, -0.35mm)
 --   1.0-3.0   +15%, -10% 
>20  +/-12.5%   --  >3  +12.5%, -10% 
GB/T 5310
GB/T 9948
GB/T 6479
 --  <4.0  +15%,-10%
(min.+0.48, -0.32mm)
 --   2-3   +12%,-10% 
 4-20   +12.5%,-10%  >3  +/-10% 
>20  +/-10%
ASME SA-179M
ASME SA-192M
ASME SA-209M
ASME SA-210M
ASME SA-231M
JIS G 3461
JIS G 3462
 --   2.41-3.8   +35%, -0%  ≤38.1  --   +20%,-0% 
 3.8-4.6   +33%,-0%  >38.1  --  22%,-0% 
>4.6  +28%,-0%   --   --   -- 
ASME SA-106
ASME SA-335
 --  All  +/12.5%    All  +/-10% 

Available size range

Table 1, size for cold-drawn or cold rolled tube (Unit:mm)

   W.T.
O.D.
2.5 3 3.2 3.5 4.0 4.5 5 5.5 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 11.0 12.0 13.0 14.0 15.0 16.0
18                                            
19                                            
22                                            
24                                            
25                                            
28                                            
29                                            
30                                            
31.8                                            
35                                            
38                                            
40                                            
42                                            
45                                            
48                                            
50                                            
51                                            
54                                            
57                                            
60                                            
63.5                                            
68                                            
70                                            
73                                            
76                                            
83                                            
89                                            
   W.T.
O.D.
2.5 3 3.2 3.5 4.0 4.5 5 5.5 6.5 7.0 7.5 8.0   9.0 9.5 10.0 11.0 12.0 13.0 14.0 15.0 16.0

Note:

  1. The size in the table above is for the cold-drawn or cold-rolled tubes.
  2. The size of the green area is the regular specification, we can accept orders directly, but the yellow area shall be subject to a technical evaluation.
  3. The Out side diameter (O.D) and wall thickness (W.T.) of the tube should be complied.

At the request of the purchaser and specified in the purchase order, the steel tubes with other O.D. and W.T. can be produced after the review.

Size for hot-rolled tube (31.8-180mm)

(Unit:mm)

   W.T.
O.D.
3.2 3.5 3.6 4.0 4.5 5.0 5.5 5.6 6.0 7.0 7.1 7.5 8.0 8.5 8.8 9.0 9.5 10.0 11.0 12.0 12.5 13.0 14.0 14.2 15.0 16.0 17.0 17.5 18.0 19.0 20.0 22.2 24.0 25.0 30.0
31.8                                                                      
33.4                                                                      
35                                                                      
40                                                                      
42                                                                      
42.4                                                                      
44.5                                                                      
45                                                                      
48                                                                      
50                                                                      
51                                                                      
54                                                                      
57                                                                      
60                                                                      
63                                                                      
63.5                                                                      
68                                                                      
70                                                                      
71                                                                      
73                                                              
76                                                              
82                                                              
89                                                              
95                                                              
101.6                                                              
108                                                                      
114.3                                                              
121                                                              
127                                                                      
133                                                                      
140                                                                      
146                                                                      
152                                                                      
159                                                                      
165                                                                      
168                                                                      
180                                                                      

Size for hot-rolled tube (OD.:200-457mm)

(Unit:mm)

   W.T.
O.D.
6 6.4 6.7 7 7.4 7.6 9 9.5 10 14 16 20 25 30 32 35 40 46 50 52 55 60
200.03                                            
219.1                                            
244.5                                            
269.8                                            
273                                            
298.5                                            
325                                            
339.7                                            
351                                            
355.6                                            
365.1                                            
377                                            
402                                            
406.4                                            
426                                            
431.8                                            
457                                            

What is 10MnDG?

10MnDG is a type of seamless steel pipe that belongs to the family of high-pressure boiler tubes. It is a low-alloy steel pipe with a chemical composition that includes carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), and other trace elements.

The chemical composition of 10MnDG typically includes:

10MnDG seamless steel pipe is mainly used in the manufacture of high-pressure and ultra-high-pressure boilers and pressure vessels. The pipes are designed to withstand high-pressure and high-temperature environments, making them suitable for use in applications such as power generation, chemical processing, and oil and gas refining.

10MnDG is a reliable material with excellent mechanical properties, including high strength, toughness, and resistance to creep deformation at high temperatures. These characteristics make it an ideal choice for use in critical applications where performance and reliability are essential.

Overall, 10MnDG seamless steel pipe is an important component of industrial piping systems, providing safe and efficient means for transporting fluids at high pressures and temperatures.

What is 16MnDG?

16MnDG is a type of seamless steel pipe that is commonly used in the manufacturing of high-pressure vessels and boilers. It belongs to the family of low-alloy steels and has a chemical composition that includes carbon, silicon, manganese, phosphorus, sulfur, and other trace elements.

The chemical composition of 16MnDG typically includes:

16MnDG seamless steel pipe has good mechanical properties, including high strength, toughness, and resistance to creep deformation at high temperatures. These characteristics make it an excellent choice for use in high-pressure and high-temperature environments, such as in the manufacture of boilers, pressure vessels, and other equipment used in power generation and chemical processing industries.

The seamless nature of 16MnDG pipes ensures uniformity and consistency in their structure, which makes them less prone to defects or failures. This enhances their reliability and safety, providing a secure means for transporting fluids at high pressures and temperatures.

Overall, 16MnDG seamless steel pipe is an important component of industrial piping systems, providing a reliable and efficient means for transporting fluids in harsh and demanding environments.

What is 09DG?

09DG is a type of seamless steel pipe that belongs to the family of high-temperature and pressure-resistant steel pipes. It has a chemical composition that includes carbon, silicon, manganese, phosphorus, sulfur, and other trace elements.

The chemical composition of 09DG typically includes:

09DG seamless steel pipe is designed to withstand high-temperature and high-pressure conditions, making it suitable for use in the manufacture of boilers, heat exchangers, and other equipment used in the power generation and chemical processing industries.

The seamless nature of 09DG pipes ensures that they have a homogeneous and consistent structure, which reduces the likelihood of defects or failures. This enhances their safety and reliability, providing a secure means for transporting fluids under high pressures and temperatures.

09DG seamless steel pipe has excellent mechanical properties, including high strength, good toughness, and resistance to creep deformation at high temperatures. These characteristics make it an ideal material for use in critical applications where performance and reliability are essential.

Overall, 09DG seamless steel pipe is an important component of industrial piping systems, providing a reliable and efficient means for transporting fluids at high pressures and temperatures.

Pickling phosphating tube

A pickling phosphating tube is a type of treated steel tube that undergoes a specific chemical process known as pickling and phosphating.

Pickling phosphating tube
Pickling phosphating tube
Pickling phosphating tube

This process is often used to prepare the surface of steel or iron materials for painting, coating, or other finishing procedures.

Materials

Carbon Steel: 10#, 20#, 35#, 45#, S45C, 55#, Q235B, Q235C, Q345D, CF53, A105

Alloy Steel: 16Mn (Q345B), 20Cr, 40Cr, 15CrMo, 20CrMo, 28CrMo, 30CrMo, 35CrMo, 42CrMo, 4130, 4140, 20CrMnTi, 40MnMoV, 20Mn2, 37Mn5, ZF6, 16MnCr5, 20MnCr5, 36Mn2V, 38Mn2V, 20Mn2, 65Mn, 15Mo3

Other: Acid Pickling and Phosphating Pipe, Special Materials Available for Customization.

Seamless tube processing

With years of expertise, we provide a diverse array of steel tube processing options. From sawing and machining tube blanks to intricate bending and upsetting operations, we actively assist you throughout your projects.

Our capabilities extend to eccentricity reduction and concentricity enhancement through turning and grinding. We excel in creating complex geometries using processes like rotary swaging and axial forming. Additionally, we offer property modifications via partial heat treatment, ensuring tailored solutions for your specific needs.

Variable wall thicknesses

Variable wall thicknesses

Drilling / stamping / lasering

Drilling / stamping / lasering

Peeling / roller burnishing

Peeling / roller burnishing

Cold forming

Cold forming

Cutting

Cutting

Beveling

Beveling

Deburring

Deburring

Thread rolling / threading

Thread rolling / threading

Partial hardening

Partial hardening

Turning / milling / grinding

Turning / milling / grinding

Reducing / expanding

Reducing / expanding

Machining

Machining

application

Application

Alloy steel pipes are ideally suitable for chemical, petrochemicals, and other energy-related applications.

The alloy steel pipe adopts high quality carbon steel, alloy structural steel and stainless & heat resisting steel as raw material through hot rolling or cold drawn to be made.

Alloy steel can be used in process area where carbon steel has limitation such as

As an important element of steel products, alloy steel pipe can be divided into seamless steel pipe and welded steel pipe according to the manufacturing technique and tube billet shape.

Here you can see the common alloy steel grade that you will come across.

Why the application of alloy steel pipe is wider than others

There are many kinds of materials used for transport in industrial production. Specifically we will have more choices and it is not limited to the use of alloy steel pipe. But even in the face of more choices, many people tend to choose alloy steel pipe. People make their own choices will have their own reasons. This means the alloy steel pipe application has its own advantages. Compared with transmission lines made of other materials, after it meets the basic application requirements, its quantity is lighter. Then in the practical application of alloy steel pipe, it will have more advantages because of this. Besides its physical characteristic advantage, it also has economic advantages. The wide application of alloy steel pipe is with kinds of reasons. So in practical usage, we can exploit the advantages to the full, in this way can we get more profits in these applications of alloy steel pipe.

What requirements should alloy steel pipe application meet

The transportation of kinds of gases or liquids in production needs to rely on alloy steel pipe. This shows that the actual role of alloy steel pipe application is important. High temperature resistant and low temperature resistant is the tolerance of temperature. In the practical application of alloy steel pipe, there will be many materials need to be transported. However their temperatures are not the same. So this can be the basic requirement to alloy steel pipe. It needs more corrosion resistance. Corrosion resistant material is the best material during transporting, because it is corrosion resistant. So it can be used in more occasions. And it is definitely very convenient for users.

The biggest advantages of alloy steel pipe

Can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy steel pipe total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy steel pipe to provide a wider space for the development of the industry. The future needs of the average annual growth of China’s high-pressure alloy steel pipe long products up to 10-12%.

Specification, standard and identification of alloy steel pipes

Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.

Industries We Serve

Our team of experienced sales specialists proudly partners with gas and chemical processors, power generation plants, oil refineries, and related industries to offer piping components and value-added services.

The biggest advantages of alloy steel pipe can be 100% recycled, environmentally friendly, energy-saving, resource conservation, national strategy, national policy to encourage the expansion of the field of application of high-pressure alloy pipe. Of alloy tube total consumption accounted steel in the proportion is only half of the developed countries, to expand the field of use of the alloy tube to provide a wider space for the development of the industry. According to the Chinese Special Steel Association alloy pipe Branch Expert Group, the future needs of the average annual growth of China’s high-pressure alloy pipe long products up to 10-12%.

Alloying Elements

Commonly used alloying elements and their effects are listed in the table given below.

Alloying Elements Effect on the Properties
Chromium Increases Resistance to corrosion   and oxidation. Increases hardenability and wear resistance. Increases high   temperature strength.
Nickel Increases hardenability. Improves   toughness. Increases impact strength at low temperatures.
Molybdenum Increases hardenability, high   temperature hardness, and wear resistance. Enhances the effects of other   alloying elements. Eliminate temper brittleness in steels. Increases high   temperature strength.
Manganese Increases hardenability. Combines   with sulfur to reduce its adverse effects.
Vanadium Increases hardenability, high   temperature hardness, and wear resistance. Improves fatigue resistance.
Titanium Strongest carbide former. Added to   stainless steel to prevent precipitation of chromium carbide.
Silicon Removes oxygen in steel making.   Improves toughness. Increases hardness ability
Boron Increases hardenability. Produces   fine grain size.
Aluminum Forms nitride in nitriding steels.   Produces fine grain size in casting. Removes oxygen in steel melting.
Cobalt Increases heat and wear   resistance.
Tungsten Increases hardness at elevated   temperatures. Refines grain size.

【H】 Ceramic lined pipe

Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.

【H】 Cast basalt lined steel pipe

Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.

【H】 Ceramic Tile Lined Pipes

Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.

【H】 Rare earth alloy wear-resistant pipe

The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.

【H】 Tubes Erosion Shields

Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.

【H】 ASTM A213 T91 Alloy Tube

The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.

Ni-Hard Wearback Pipes Ni-Hard Wearback Pipes
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