Specifications of general boiler tube

Date:2025-03-03View:93Tags:general boiler tubes, boiler tube specifications

Boiler tubes are hollow steel materials with openings at both ends and a length greater than their circumference. Based on their manufacturing process, they are classified into seamless steel tubes and welded steel tubes.

 

As critical components of boilers, selecting the right boiler tubes is essential for enhancing service life and operational efficiency. The quality of boiler tubes directly impacts boiler performance, influencing both industrial production and everyday applications.

 

General Boiler Tube Model Chart

Model

Material

Diameter(mm)

Wall Thickness(mm)

Length(m)

20G

Iron

51

5.5

6-12

20MnG

Iron

51

5.5

6-12

25MnG

Iron

51

5.5

6-12

15CrMoG

Iron

51

5.5

6-12

12Cr1MoVG

Iron

51

5.5

6-12

12Cr2MoG

Iron

51

5.5

6-12

10Cr9Mo1VNb

Iron

51

5.5

6-12

1Cr18Ni9Ti

Stainless Steel

51

5.5

6-12

1Cr18Ni9Ti

Stainless Steel

76

6.0

6-12

1Cr18Ni9Ti

Stainless Steel

89

6.0

7-12

 

General Boiler Tube Size Chart

Material

Diameter(mm)

Wall Thickness(mm)

Iron

51

5.5

Iron

57

6.0

Iron

60

6.0

Iron

63.5

8.0

Iron

76

7.0

Iron

89

8.0

Stainless Steel

51

5.5

Stainless Steel

76

6.0

Stainless Steel

89

6.0

 

General Boiler Tube Parameter Chart

Model

Main Material

Tensile Strength(MPa)

Yield Strength(MPa)

Elongation(%)

Hardness(HB)

20G

Iron

410-550

≥245

≥24

≤179

20MnG

Iron

415-550

≥245

≥22

≤179

25MnG

Iron

450-600

≥275

≥22

≤217

15CrMoG

Iron

440-640

≥235

≥21

≤207

12Cr1MoVG

Iron

470-640

≥255

≥21

≤241

12Cr2MoG

Iron

450-600

≥280

≥20

≤255

10Cr9Mo1VNb

Iron

585-780

≥415

≥20

≤255

1Cr18Ni9Ti

Stainless Steel

≥520

≥205

≥40

≤187

 

General Boiler Tube Specification Chart

Material

Range

Iron

Φ51x5.5-6.0x6-12m

Iron

Φ57x6.0-7.0x6-12m

Iron

Φ60x6.0-7.0x6-12m

Iron

Φ63.5x8.0x6-12m

Iron

Φ76x7.0-8.0x6-12m

Iron

Φ89x8.0-10x7-12m

Stainless Steel

Φ51x5.5-6.0x6-12m

Stainless Steel

Φ76x6.0-8.0x6-12m

Stainless Steel

Φ89x6.0-8.0x7-12m

 

Key Factors for Selecting Boiler Tubes

Choosing the right boiler tube is crucial for ensuring efficient and safe boiler operation. The following factors should be considered when selecting boiler tubes:

1. Flow Rate

The flow rate should be determined based on the required heat output and water circulation volume. A flow rate that is too high or too low can negatively impact the boiler’s performance and efficiency.

2. Pressure

Boiler tubes must withstand the maximum operating pressure and temperature of the system. The material's load-bearing capacity should also be taken into account. Selecting tubes with insufficient pressure resistance may lead to pipe bursts, while excessive pressure ratings can increase the risk of ruptures.

3. Material

The choice of material should be based on fuel type, medium, pressure, and temperature. Common materials include:

Carbon steel – Suitable for lower-temperature and pressure applications.

Alloy steel – Offers enhanced strength and heat resistance.

Stainless steel – Provides excellent corrosion resistance for high-temperature environments.

4. Safety Features

Boiler tubes must be equipped with safety valves and pressure-reducing valves to maintain safe operation and prevent excessive pressure buildup.

5. Size

The tube size should be selected based on the above factors. Larger tubes generally increase costs, while smaller tubes may be more suitable for compact boiler systems with lower flow requirements.

 

Conclusion

Selecting the appropriate boiler tube involves careful consideration of flow rate, pressure, material, and size to ensure safe and efficient operation. In practical applications, choosing the right specifications based on specific system requirements helps optimize performance and extend the boiler’s service life.


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