Details of boiler steel pipes commonly used in industrial projects

First, a brief introduction to boiler steel pipes

Boiler steel pipes refer to steel materials with hollow sections and openings at both ends. The length of the steel pipe is relatively large compared to the surrounding area. According to the production method, it can be divided into seamless steel pipes and welded steel pipes. The specifications of the steel pipes are expressed by the external dimensions (such as the outer diameter or the side length) and the wall thickness. The size range is very wide, from small capillaries to large diameter pipes with a diameter of several meters. Steel pipes can be used for pipelines, thermal equipment, the mechanical industry, petroleum geological exploration, containers, the chemical industry, and special purposes.

Second, the production method of boiler steel pipes

Boiler steel pipes are a kind of seamless steel pipes. The manufacturing method is the same as that of seamless steel pipes, but there are strict requirements on the type of steel used to manufacture steel pipes. According to the use temperature, they are divided into general boiler steel pipes and high-pressure boiler steel pipes. The mechanical properties of boiler steel pipes are important indicators to ensure the final use performance (mechanical properties) of steel, which depends on the chemical composition and heat treatment system of steel. In the steel pipe standard, according to different use requirements, tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness indicators, as well as high and low-temperature properties required by users are specified.

① The general boiler steel pipe is used at a temperature below 350℃, and domestic pipes are mainly made of No. 10 and No. 20 carbon steel hot-rolled pipes or cold-drawn pipes.

② High-pressure boiler steel pipes are often in high-temperature and high-pressure conditions when used. Under the action of high-temperature flue gas and water vapor, the pipes will oxidize and corrode. The steel pipe is required to have high lasting strength, high anti-oxidation and corrosion performance, and good organizational stability.

Third, the use of boiler steel pipes

① General boiler steel pipes are mainly used to manufacture water-cooled wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, large and small smoke pipes arch brick tubes, etc.

② High-pressure boiler steel pipes are mainly used to manufacture superheater tubes, reheater tubes, gas guide tubes, main steam pipes, etc. for high-pressure and ultra-high-pressure boilers. The supply and demand trend of the high-pressure boiler steel pipe industry is generally stable, but the supply and demand situation of each specific sub-industry will further differentiate. Industry insiders pointed out that the most critical link is the use and promotion of new energy-saving and heat-insulating 20g high-pressure boiler steel pipe equipment.

New energy-saving 20g high-pressure boiler steel pipe products are gradually increasing in the market, such as green environmental protection coatings, energy-saving and water-saving sanitary ware products, environmental protection stones, environmental protection external cement foam insulation board, etc. The prospects of energy-saving and environmental protection products in the vast market of 20g high-pressure boiler steel pipe industry are promising.