Brief introduction and production method of boiler steel tube

Boiler steel tubes refer to steel products that are open at both ends and have a hollow section. The ratio of its length to the surrounding area is large. According to the production method, it can be divided into seamless steel tubes and welded steel tubes. Wall thickness indicates a wide range of sizes, from capillary tubes with very small diameters to large-bore tubes up to several meters in diameter. Steel pipes can be used in pipelines, thermal equipment, the machinery industry, petroleum geological exploration, containers, the chemical industry, and special purposes.

Boiler steel tubes are a type of seamless tube. The manufacturing method is the same as that of the seamless pipe, but there are strict requirements on the steel type used in the manufacture of the steel pipe. According to the use temperature, it is divided into two types: general boiler steel tube and high-pressure boiler steel tube.

The mechanical properties of boiler steel tubes are an important indicator to ensure the end-user performance (mechanical properties) of steel, which depends on the chemical composition and heat treatment system of steel. In steel pipe standards, tensile properties (tensile strength, yield strength or yield point, elongation), hardness, toughness, and high and low-temperature properties required by users are specified according to different use requirements.

① Generally, the operating temperature of boiler steel tubes is below 350°C, and domestic tubes are mainly made of No. 10 and No. 20 carbon-structured steel hot-rolled tubes or cold-drawn tubes.
②High-pressure boiler steel tubes are often under high temperature and high-pressure conditions during use, and the tubes will be oxidized and corroded under the action of high-temperature flue gas and water vapor. Steel pipes are required to have high durable strength, high resistance to oxidation and corrosion, and good structural stability.