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Company news about YUHONG GROUP - Boiler Bend tube

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YUHONG GROUP - Boiler Bend tube

2025-04-10

YUHONG GROUP - Boiler Bend tube

 

Boiler bending is a boiler system used to change the direction of the pipeline key components, widely used in thermal power generation, chemical, petroleum and other industries.
The following is a detailed introduction from a professional point of view of the design of boiler bends, materials, manufacturing process and selection of key points:

 

1. the role and importance of boiler bends:
- Role:
Change the direction of the pipeline to adapt to the complex arrangement.
Reduce fluid resistance, optimise heat transfer efficiency.
Relieve thermal expansion stress, extend the life of the system.
- Importance:
The quality of the bends directly affects the safety, efficiency and maintenance costs of the boiler.
Unqualified bends may cause leakage, tube burst or reduced thermal efficiency.

 

2. Material Selection

Material Application Advantage
Carbon steel (ASTM A106) Low-pressure, low-temperature boilers (≤ 425℃) Low cost, easy to process
Alloy steel (ASTM A335) high-pressure, high-temperature boilers (≤ 600℃) High strength, good oxidation resistance
Stainless steel (ASTM A312) corrosive media corrosion resistance, long service life


Material performance requirements
High-temperature strength: maintain sufficient tensile strength and creep strength in the boiler operating temperature.
Corrosion resistance: resistant to water vapour, flue gas and chemical media.
Welding performance: easy to weld, weld performance is stable.

 

3. Manufacturing process

Bend forming methods
Cold bending - at room temperature with a mould or pipe bender forming, for thin-walled pipe and small angle bends. For low-pressure boilers and small-diameter pipes
Hot bending - heated to the recrystallisation temperature (carbon steel: 900-950 ℃) and then formed, suitable for thick-walled pipe and large angle bending. Suitable for high pressure boilers and large calibre pipes
Induction bending - localised forming by high-frequency induction heating, high precision and small deformation. Suitable for complex bending with high precision requirements

 

Post-treatment process

Heat treatment: Eliminate forming stress and restore material properties (e.g. normalising, tempering).
Surface treatment: sandblasting, polishing or painting to improve corrosion resistance and appearance quality.
Non-destructive testing (NDT): ultrasonic (UT) and radiographic (RT) testing to ensure that there are no defects such as cracks and porosity.

 

4.Common problems and solutions
Material defects or forming stress is not eliminated Strengthen the non-destructive testing and bending cracking Optimise the heat treatment process
Uneven wall thickness Adopt CNC pipe bender bending local thinning distribution, control the forming speed
Improper welding process or material mismatch Use of qualified welding materials and strict compliance with welding specifications

 

latest company news about YUHONG GROUP - Boiler Bend tube 0

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News Details
Home > News >

Company news about-YUHONG GROUP - Boiler Bend tube

Events

News

Cases

YUHONG GROUP - Boiler Bend tube

2025-04-10

YUHONG GROUP - Boiler Bend tube

 

Boiler bending is a boiler system used to change the direction of the pipeline key components, widely used in thermal power generation, chemical, petroleum and other industries.
The following is a detailed introduction from a professional point of view of the design of boiler bends, materials, manufacturing process and selection of key points:

 

1. the role and importance of boiler bends:
- Role:
Change the direction of the pipeline to adapt to the complex arrangement.
Reduce fluid resistance, optimise heat transfer efficiency.
Relieve thermal expansion stress, extend the life of the system.
- Importance:
The quality of the bends directly affects the safety, efficiency and maintenance costs of the boiler.
Unqualified bends may cause leakage, tube burst or reduced thermal efficiency.

 

2. Material Selection

Material Application Advantage
Carbon steel (ASTM A106) Low-pressure, low-temperature boilers (≤ 425℃) Low cost, easy to process
Alloy steel (ASTM A335) high-pressure, high-temperature boilers (≤ 600℃) High strength, good oxidation resistance
Stainless steel (ASTM A312) corrosive media corrosion resistance, long service life


Material performance requirements
High-temperature strength: maintain sufficient tensile strength and creep strength in the boiler operating temperature.
Corrosion resistance: resistant to water vapour, flue gas and chemical media.
Welding performance: easy to weld, weld performance is stable.

 

3. Manufacturing process

Bend forming methods
Cold bending - at room temperature with a mould or pipe bender forming, for thin-walled pipe and small angle bends. For low-pressure boilers and small-diameter pipes
Hot bending - heated to the recrystallisation temperature (carbon steel: 900-950 ℃) and then formed, suitable for thick-walled pipe and large angle bending. Suitable for high pressure boilers and large calibre pipes
Induction bending - localised forming by high-frequency induction heating, high precision and small deformation. Suitable for complex bending with high precision requirements

 

Post-treatment process

Heat treatment: Eliminate forming stress and restore material properties (e.g. normalising, tempering).
Surface treatment: sandblasting, polishing or painting to improve corrosion resistance and appearance quality.
Non-destructive testing (NDT): ultrasonic (UT) and radiographic (RT) testing to ensure that there are no defects such as cracks and porosity.

 

4.Common problems and solutions
Material defects or forming stress is not eliminated Strengthen the non-destructive testing and bending cracking Optimise the heat treatment process
Uneven wall thickness Adopt CNC pipe bender bending local thinning distribution, control the forming speed
Improper welding process or material mismatch Use of qualified welding materials and strict compliance with welding specifications

 

latest company news about YUHONG GROUP - Boiler Bend tube 0

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