Boiler tubes are metal tubes located inside a boiler and used to heat water to produce steam.

Characteristics of boiler tubes

Boiler tube often work under high temperature and pressure, pipe flue water in the high temperature steam will be oxidation and corrosion effects, so the requirement of durable steel with high strength, high oxidation resistance and good organizational stability, high pressure boiler tube in addition to the chemical composition and mechanical properties, the root to do the hydraulic test, the need for flaring, flattening test. Steel to heat treatment delivery. In addition, the finished steel microstructure, grain size, decarburization, etc. also have certain requirements.High-pressure boiler tube belongs to the seamless steel tube category. Seamless steel tubes are manufactured in the same way, but are used to manufacture steel tubes with strict requirements. High pressure boiler tubes are often used under high temperature and pressure conditions, and the tubes are subject to oxidation and corrosion under the action of high temperature gas and water vapor. Durable steel is required to have high strength, high oxidation and corrosion resistance, and good organizational stability.High pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air tubes and main steam tubes for high pressure and high pressure boilers. Heating surface tubes for low and medium pressure boilers (working pressure generally does not exceed 5.88Mpa, working temperature below 450℃) with high pressure boiler tubes; for high pressure boilers (working pressure generally above 9.8Mpa, working temperature between 450℃ and 650℃) with heating surface tubes, coal conservators, superheaters, reheaters, and tubes for petrochemical industry.

When choosing boiler tubes, look at the following to select a suitable and good quality tube.Look at the cross-section of the tube. A good quality seamless tube will have a smooth cross-section with no bumps or irregularities.Check the density of the pipe to know the percentage of impurities in the pipe. If the pipe shows a low density, avoid it!Check the surface of the boiler tube. A good quality boiler tube has a smooth surface. If a rough and uneven surface is found, you can be sure that the quality is not acceptable.Small diameter high pressure boiler tube surface defects affect the quality, mainly the generation of scrap.

Boiler tubes can withstand temperatures up to 700°C and pressures up to 300 bar, and are therefore mainly used in energy equipment. They are most commonly used for steam pipes and steam boilers.
The use of boiler tubes is often determined by their additional properties. For example, acid-resistant boiler tubes are ideal for building installations that transport various chemicals because they are resistant to corrosion. On the other hand, heat-resistant boiler tubes do not deform even under the influence of high temperatures. In addition, their structural composition includes special steel alloys that minimize wear and tear.
Using thick-walled boiler tubes is worthwhile if we want to combine high strength with relatively low weight in the installation. They are also a good choice for installations where hot liquids need to be transported under pressure. Stainless steel boiler tubes are also often used. They are covered with an additional layer that protects them from corrosion, allowing them to be used in wet conditions.