Boiler Pipe

Boiler Pipe & Tube, Seamless Boiler Tube, High Pressure Boiler Tube, Medium and Low Pressure Boiler Tube, Carbon Steel Boiler Tube

Standard:

ASTM A179, ASTM A192, ASTM A210, ASTM A213, ASTM A178, ASTM A209, ASTM A335, ASTM A333, DIN 17175, GB3087-1999, JIS G3454

Application:

Used for manufacturing superheated pipelines, the steam pipe, boiling water tube, flue tube, small flue tube, etc.of low, mediam and high pressure boiler, the general industry boiler.

Sizes:

Out diameter:10mm to 510mm
Wall thickness:1.5mm to 26mm

Boiler tubes are a type of steel tubes, and boiler tubes are generally made of seamless tubes. Boiler tubes are pipes used to transport high-temperature and high-pressure fluids. They are commonly used in equipment such as industrial boilers, heat exchangers, and power stations. Boiler tubes have the characteristics of high temperature resistance, high pressure resistance, corrosion resistance, etc., and are one of the most important components of these equipments.

Boiler tubes are usually made of carbon steel, alloy steel, stainless steel and other metal materials. Their quality and performance directly affect the safe operation and energy efficiency of the boiler.

The mechanical properties of boiler tubes are important indicators to ensure the final performance (mechanical properties) of steel. It depends on the chemical composition and heat treatment system of the steel. In steel pipe standards, tensile properties (tensile strength, yield strength or yield point, elongation), hardness and toughness indicators are specified according to different usage requirements, as well as high and low temperature properties required by users.

① Generally, the operating temperature of boiler tubes is below 350°C, and they are mainly made of low-carbon steel hot-rolled tubes or cold-drawn tubes.
② High-pressure boiler tubes are often exposed to high temperature and high pressure conditions when used. Under the action of high-temperature flue gas and water vapor, the tubes will oxidize and corrode. Steel pipes are required to have high lasting strength, high resistance to oxidation and corrosion, and good structural stability.

Boiler tube applications:
① General boiler tubes are mainly used to make water wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke tubes and arch brick tubes, etc.
② High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air guide tubes, main steam tubes, etc. for high-pressure and ultra-high-pressure boilers.

Steam Boilers
Fossil Fuel Plants
Heat Exchangers
Electric Power Plants
Waste Heat Plants
Power Generation

Cogeneration Facilities
Air Preheater Unit
Economiser etc.

How to choose the right boiler tube material?

1. Temperature and pressure requirements: Boilers have different temperature and pressure requirements under different working conditions. Generally speaking, under high temperature and high pressure, commonly used materials include ferritic stainless steel, alloy steel and super alloy. At low temperatures and low pressures, ordinary carbon steel can meet the needs.

2. Corrosive environment: Corrosive gases or liquids may exist in the boiler working environment, so materials with good corrosion resistance need to be selected. If acidic environments are encountered, stainless steel or nickel-based alloys are common choices.
3. Material properties: Boiler tube materials need to have good thermal conductivity and mechanical properties to ensure heat transfer effect and safe operation. Select appropriate materials according to specific working conditions, such as heat-resistant steel, pressure-resistant steel and reinforced materials.

4. Cost considerations: The cost of different materials is also an important factor in selection. On the premise of meeting the usage requirements, material performance and cost need to be comprehensively considered to select economical and suitable materials.

Out Diameter Torlerances

Standard	Out Diameter	Tolerance
GB3087	≤180	±1.0%(min: ±0.5mm)
GB5310	≤50	±0.5mm
	>50	±1.0%

Wall Thickness Tolerances

Standard	Wall Thickness(mm)	Tolerance
GB3087	3-20	+15%,12.5%
	>20	±12.5%
GB5310	<3.5	+15%,-10%
	3.5-20	+15%,-10%
	>20	±10%

Chemical composition and mechanical properties

Standard	Grade	Chemical composition(%)					Mechanical properties
		C	Si	Mn	P	S	Tensile Strength(Mpa)	Yield Strength(Mpa)	Elongation(%)
DIN17175	St35.8	≤0.17	0.10-0.35	0.40-0.80	≤0.030	≤0.030	360-480	≥235	≥25
	St45.8	≤0.21	0.10-0.35	0.40-1.20	≤0.030	≤0.030	410-530	≥255	≥21