GB 5310 15MoG high pressure seamless boiler tubes

GB 5310 15MoG high pressure seamless boiler tubes are low-alloy steel containing Mo, which offers good mechanical properties and high-temperature strength.

GB 5310 15MoG high pressure seamless boiler tubes

GB 5310 15MoG is a low-alloy steel used for making high-pressure seamless boiler tubes. The composition of 15MoG includes Mo, which provides improved high-temperature strength, toughness, and resistance to thermal fatigue.

15MoG high-pressure seamless boiler tubes are typically used in power plant boilers, where they can be found as superheaters, reheaters, steam pipes, and other high-pressure components. The working pressure for the use of these tubes is typically above 9.8 MPa and the working temperature is between 450℃ and 650℃.

Some of the main features of 15MoG high-pressure seamless boiler tubes include good high-temperature strength, corrosion resistance, and dimensional accuracy. They also have a low thermal expansion coefficient that reduces thermal stress during operation, which improves the reliability of the tubes.

The production and use of 15MoG high-pressure seamless boiler tubes must comply with strict standards to ensure their safety and reliability. Different end types are available, such as plain end, beveled end, or threaded ends, and the tubes can come in various lengths, outer diameters, and wall thicknesses.

Manufacturing methods

(1)Steel smelting method
GB 5310 15MoG steel will be smelted by electric furnace plus furnace refining, oxygen converter plus furnace refining or electroslag remelting method.

(2)Manufacturing methods and requirements for tube blanks
The tube blank can be produced by continuous casting, die casting or hot rolling (forging).

(3)Manufacturing method of steel tube
GB 5310 15MoG Steel tubes shall be manufactured by hot rolling (extrusion, expansion) or cold drawing (rolling).

15MoG is a low-alloy steel that offers excellent mechanical properties and high-temperature strength. 15MoG high-pressure seamless boiler tubes are a critical component in power plant boilers, and their quality and performance are essential factors in ensuring reliable and safe operation.

Chemical composition of GB 5310 15MoG high pressure seamless boiler tubes

Steel Grade C Si Mn S P Cr Mo
15 MoG 0.12-0.20 0.17-0.37 0.40-0.80 0.015 0.025   0.25-0.35

Mechanical properties of GB 5310 15MoG high pressure seamless boiler tubes

Grade Tensile strength Yield point(Mpa) Elongation(%) Impact(J)
(Mpa) not less than not less than not less than
15MoG 450-600 270 22/20 40/27
20MoG 415-665 220 22/20 40/27

Application of GB 5310 15MoG high pressure seamless boiler tubes:

GB 5310 15MoG high-pressure seamless boiler tubes are widely used in various industrial applications, mainly for making high-pressure components in power plant boilers. Here are the main applications of 15MoG:

  1. Superheaters: 15MoG high-pressure seamless boiler tubes are used to make superheaters that increase the temperature of steam to improve the efficiency of the power plant.
  2. Reheaters: 15MoG high-pressure seamless boiler tubes are also used to make reheaters that reheat the steam after it has passed through the turbine's first stage.
  3. Steam Pipes: These seamless pipes are used in power plants to transport high-pressure steam between the different stages of the power generation process.
  4. Other high-pressure components: In addition to superheaters, reheaters and steam pipes, 15MoG high-pressure seamless boiler tubes are used to make other high-pressure components such as headers, steam walls, and economizers, among others.

In general, 15MoG high-pressure seamless boiler tubes are critical components in power plant boilers, and their quality and performance must meet strict standards for production and use to ensure reliable and safe operation.

The main features of GB 5310 15MoG high pressure seamless boiler tubes:

  1. High-temperature mechanical properties: 12Cr2MoG has good strength, toughness, and ductility at high temperatures, which makes it suitable for use in high-pressure boilers with working temperature between 450℃ and 650℃.
  2. Corrosion resistance: 12Cr2MoG has good corrosion resistance to steam, water, and other gases under high-temperature and high-pressure conditions, which helps to extend the service life of the boiler tubes.
  3. Low thermal expansion coefficient: The low thermal expansion coefficient of 12Cr2MoG reduces thermal stress during operation, which improves the reliability of the boiler tubes.
  4. High dimensional accuracy: 12Cr2MoG high-pressure seamless boiler tubes have high dimensional accuracy and smooth surface finish, which ensures good fit and easy installation in high-pressure boiler systems.
  5. Good weldability: 12Cr2MoG can be easily welded using standard welding techniques, which helps to reduce manufacturing costs and improve efficiency.

12Cr2MoG high-pressure seamless boiler tubes offer excellent mechanical properties, corrosion resistance, and dimensional accuracy, making them a reliable and durable material for use in high-pressure boilers in various industrial applications.

The main features of GB 5310 15MoG high-pressure seamless boiler tubes are:

  1. High-temperature mechanical properties: 15MoG contains molybdenum (Mo) that provides improved high-temperature strength, toughness, and resistance to thermal fatigue. This makes it suitable for use in high-pressure boilers with working temperatures between 450℃ and 650℃.
  2. Corrosion resistance: 15MoG has good corrosion resistance to steam, water, and other gases under high-temperature and high-pressure conditions, which helps to extend the service life of the boiler tubes.
  3. Low thermal expansion coefficient: The low thermal expansion coefficient of 15MoG reduces thermal stress during operation, which improves the reliability of the boiler tubes.
  4. High dimensional accuracy: 15MoG high-pressure seamless boiler tubes have high dimensional accuracy and smooth surface finish, which ensures good fit and easy installation in high-pressure boiler systems.
  5. Good weldability: 15MoG can be easily welded using standard welding techniques, which helps to reduce manufacturing costs and improve efficiency.

15MoG high-pressure seamless boiler tubes offer excellent mechanical properties, corrosion resistance, and dimensional accuracy, making them a reliable and durable material for use in high-pressure boilers in various industrial applications.

GB 5310 is a standard for seamless tubes used in high-pressure steam boilers and pipelines. The main application for GB 5310 tubes is as high-pressure pipeline tubes in boiler projects. These tubes can be used for superheaters, reheaters, and windpipes.

The GB 5310 standard applies to tubes made from materials such as:

The long-term use temperature for GB 5310 20G seamless steel pipes used as headers and steam pipes is ≤ 425 ° C.

Chemical Compositions(%) of GB 5310

Steel Grade C Si Mn S P Cr Mo V Ti B W Ni Al Nb N
20G 0.17-0.23 0.17-0.37 0.35-0.65 0.015 0.025                    
20 MnG 0.17-0.24 0.17-0.37 0.70-1.00 0.015 0.025                    
25MnG 0.22-0.27 0.17-0.37 0.70-1.00 0.015 0.025                    
15MoG 0.12-0.20 0.17-0.37 0.40-0.80 0.015 0.025   0.25-0.35                
20MnG 0.15-0.25 0.17-0.37 0.40-0.80 0.015 0.025   0.44-0.65                
12CrMoG 0.08-0.15 0.17-0.37 0.40-0.70 0.015 0.025 0.40-0.70 0.40-0.55                
15CrMoG 0.12-0.18 0.17-0.37 0.40-0.70 0.015 0.025 0.80-1.10 0.40-0.55                
12Cr2MoG 0.08-0.15 ≤0.60 0.40-0.60 0.015 0.025 2.00-2.50 0.90-1.13                
12Cr1MoVG 0.08-0.15 0.17-0.37 0.40-0.70 0.010 0.025 0.90-1.20 0.25-0.35 0.15-0.30              
12Cr2MoWVTiB 0.08-0.15 0.45-0.75 0.45-0.65 0.015 0.025 1.60-2.10 0.50-0.65 0.28-0.42 0.08-0.18 0.002-0.008 0.30-0.55        
10Cr9Mo1VNbN 0.08-0.12 0.20-0.50 0.30-0.60 0.010 0.020 8.00-9.50 0.85-1.05 0.18-0.25       ≤0.040 ≤0.040 0.06-0.10 0.03-0.07

Manufacturing methods

Steel smelting method
High-quality carbon structural steel and alloy structural steel shall be smelted by electric furnace plus furnace refining, oxygen converter plus furnace refining or electroslag remelting method, and steel refined outside the furnace shall be subjected to vacuum degassing treatment.

10Cr9Mo1VNbN, 10Cr9MoW2VNbBN, 10Cr11MoW2VNbCu1BN, 11Cr9Mo1W1VNbBN and stainless (heat-resistant) steel should be smelted by electric furnace plus furnace refining or electroslag remelting. The steel refined outside the furnace should be vacuum degassed.

After consultation between the supplier and the buyer, and indicating in the contract, other higher-required smelting methods may be adopted. When the purchaser specifies a certain smelting method, it should be indicated in the contract.

Manufacturing methods and requirements for tube blanks
The tube blank can be produced by continuous casting, die casting or hot rolling (forging).
Continuous casting tube blanks shall comply with the provisions of YB/T 4149, in which the level of low-fold structural defects shall not exceed 1; the hot-rolled (forged) tube blanks shall comply with the provisions of YB/T ××××; It is carried out in accordance with the regulations for hot-rolled (forged) tube blanks.

Manufacturing method of steel pipe
Steel pipes shall be manufactured by hot rolling (extrusion, expansion) or cold drawing (rolling). Steel pipes of grade 08Cr18Ni11NbFG shall be manufactured by cold drawing (rolling) seamless method.

Delivery status

The steel pipe shall be delivered in a heat treated condition. The heat treatment system for steel pipes shall comply with the requirements of Table 4. The heat treatment system for steel pipes should be filled in the quality certificate.

Heat treatment system for steel pipes

 No. Steel Pipe Heat treatment
1 12Ga、20Ga 880 ℃~940 ℃,Normalizing
2 20MnGa、25MnGa 880 ℃~940 ℃,Normalizing
3 15MoGa、20MoGa 890 ℃~950 ℃,Normalizing
4 12CrMoGa 900 ℃~960 ℃,Normalizing;650 ℃~730 ℃,Tempering
5 15CrMoGa 900 ℃~960 ℃,Normalizing;660 ℃~730 ℃,Tempering
6 12Cr2MoGa 900 ℃~960 ℃,Normalizing;700 ℃~750 ℃,Tempering
It can also be heated to 900 °C ~ 960 °C, and the furnace is cooled to 700 °C for more than 1 h, and air-cooled.
7 12Cr1MoVGa 980 ℃~1 020 ℃,Normalizing,980 °C ~ 1 020 °C normalizing, when the wall thickness is greater than 30 mm, forced cooling; 720 °C ~ 760 °C tempering.
8 12Cr2MoWVTiB 1 000 ℃~1 035 ℃,Normalizing;760 ℃~790 ℃,Tempering
9 07Cr2MoW2VNbB ≥1 040 ℃,Normalizing,≥730 ℃,Tempering
10 08Cr2Mo1W2VTiB ≥980 ℃,Normalizing,≥730 ℃,Tempering
11 12Cr3MoVSiTiB 1 040 ℃~1 060 ℃,Normalizing;720 ℃~770 ℃,Tempering
12 09Ni1MnMoNbCu 880 ℃~980 ℃,Normalizing,580 ℃~680 ℃,Tempering
13 10Cr9Mo1VNbN ≥1 040 ℃,Normalizing,≥730 ℃,Tempering
14 10Cr9MoW2VNbBN ≥1 040 ℃,Normalizing,≥730 ℃,Tempering
15 10Cr11MoW2VNbCu1BN ≥1 040 ℃,Normalizing,≥730 ℃,Tempering
16 11Cr9Mo1W1VNbBN 1 040 ℃~1 080 ℃,Normalizing,740 ℃~780 ℃,Tempering
17 15Cr18Ni9b Solution treatment: solution temperature ≥1 040 °C.
18 10Cr18Ni9NbCu3BNb Solution treatment: solution temperature ≥ 1 100 °C.
19 07Cr25Ni21NbNcd Separate solution treatment: solution temperature ≥ 1 100 °C.
20 08Cr18Ni11Nbbd Solution treatment: solution temperature ≥1 040 °C.
21 07Cr18Ni11Nbcd Separate solution treatment: hot rolling (extrusion, expansion) steel tube solid solution temperature ≥ 1 050 °C, cold drawn (rolled) steel tube solid solution temperature ≥ 1100 °C.
22 08Cr18Ni10NbFG Softening heat treatment before cold working: softening heat treatment temperature should be at least 50 °C higher than solution heat treatment temperature; solution treatment after final cold working: solution temperature ≥1 180 °C
a. The finishing temperature of the hot-rolled steel pipe is at the critical temperature of the phase transition Ar3 to the upper limit of the temperature specified in the table, and when the steel pipe is air-cooled, the steel pipe is considered to be normalized.

b. The finishing temperature of the hot-rolled steel pipe meets the solid solution temperature specified in the table. As an alternative to the solid solution treatment method, the steel pipe can be separately quenched by water or cooled by other fast enough methods.

c, the solution treatment should be a separate heat treatment, and the heat treatment in the process is not allowed to replace the separate solution treatment.

d. According to the requirements of the purchaser, the steel pipes of the grades 07Cr25Ni21NbN, 08Cr19Ni10Nb and 07Cr18Ni11Nb may be subjected to a stabilization heat treatment lower than the initial solution treatment temperature after the solution treatment, and the temperature of the stabilization heat treatment is negotiated between the supplier and the purchaser.

Mechanical Properties of GB5310

Grade Tensile strength
(Mpa)
Yield point(Mpa)
not less than
Elongation(%)
not less than
Impact(J)
not less than
20G 410-550 245 24/22 40/27
25MnG 485-640 275 20/18 40/27
15MoG 450-600 270 22/20 40/27
20MnG 415-665 220 22/20 40/27
12CrMoG 410-560 205 21/19 40/27
12Cr2MoG 450-600 280 22/20 40/27
12Cr1MoVG 470-640 255 21/19 40/27
12Cr2MoWVTiB 540-735 345 18 40/27
10Cr9Mo1VNb ≥585 415 20 40
1Cr18Ni9 ≥520 206 35  
1Cr19Ni11Nb ≥520 206 35  

Additional Condition

GB 5310 High pressure boiler tube Application

Boiler tubing is used in these industries:

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%.

Q&A

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 most important and desired changes in alloy steel are

Alloy steels are made by combining carbon steel with one or several alloying elements, such as manganese, silicon, nickel, titanium, copper, chromium and aluminum. These metals are added to produce specific properties that are not found in regular carbon steel. The elements are added in varying proportions (or combinations) making the material take on different aspects such as increased hardness, increased corrosion resistance, increased strength, improved formability (ductility); the weldability can also change.

Alloying Elements & Their Effects

Pipes, Tubes and Hollow Sections

Norms

Grade

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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