Boiler pipes are crucial components used in various industrial sectors, particularly in the construction of boilers, superheaters, and heat exchangers. These pipes must withstand high pressure and temperature, making material selection critical.

1. Common Boiler Pipe Grades:

ASTM A106 Grade B:

Material: Carbon steel

Application: Used for high-temperature service in power plants, refineries, and other industrial settings. Commonly used for steam, water, gas, and air pipelines.

ASTM A335 P11/P22:

Material: Ferritic alloy steel

Application: Often used in power plants and petrochemical plants for high-temperature and high-pressure environments.

ASTM A192:

Material: Carbon steel

Application: Specifically designed for seamless boiler tubes, this grade is commonly used in boiler, superheater, and heat-exchanger tubes.

ASTM A213 T11/T22:

Material: Alloy steel

Application: Suited for high-pressure services and high-temperature environments, typically in the construction of boilers and superheaters.

EN 10216-2 P235GH/P265GH:

Material: Non-alloy steel

Application: These grades are widely used in European standards for pressure vessels and boilers, known for their good weldability and high-temperature strength.

DIN 17175 St35.8/St45.8:

Material: Seamless steel pipes

Application: Used primarily in boiler installations, high-pressure piping, and installations with high temperatures.

2. Material Specifications:

Mechanical Properties:

Tensile Strength: Varies depending on the grade, typically ranging from 415 MPa to 585 MPa.

Yield Strength: Generally, 205 MPa to 275 MPa depending on the material and application.

Elongation: Varies from 20% to 35%, depending on the specific material grade and its application.

Chemical Composition:

Carbon Content: Typically 0.10% to 0.30% depending on the steel grade.

Alloy Elements: May include chromium, molybdenum, and manganese, enhancing heat resistance and strength.

Heat Treatment: Boiler pipes often undergo heat treatments such as annealing or normalizing to improve their strength and ductility.

3. Applications:

Boiler Manufacturing: Boiler pipes are extensively used in the production of steam boilers, superheaters, and reheaters, where they operate under high pressures and temperatures.

Power Plants: In power plants, boiler pipes carry steam to the turbines and play a critical role in energy production.

Petrochemical Industry: These pipes are used in high-temperature processing units and for transporting chemicals under high pressure.

Shipbuilding: Boiler pipes are also used in marine boilers and other high-pressure systems within ships.

Heat Exchangers: Boiler pipes are employed in heat exchangers to transfer heat efficiently in various industrial processes.

These pipes are specifically designed to withstand the extreme conditions of high pressure and temperature, making them essential components in a wide range of industrial applications.