High-pressure boiler tubes are a special type of steel tubes that are mainly used in boiler equipment in extreme environments such as high temperature, high pressure, and high corrosion. This article will provide a detailed encyclopedia introduction to high-pressure boiler tubes, including their types, manufacturing processes, performance requirements, application fields and market prospects.
Types of high pressure boiler tubes:
High-pressure boiler tubes can be divided into two types: seamless steel pipes and welded steel pipes according to the manufacturing process. Seamless steel pipes are made by hot-rolling or cold-drawing processes and have the advantages of thin pipe walls, high pressure resistance, and low fluid resistance; welded steel pipes are made of steel plates or steel strips and have the advantages of high production efficiency and low cost.
Manufacturing process of high pressure boiler tubes
1. Seamless steel pipe
The production processes of
seamless steel pipes mainly include hot rolling and cold drawing. The hot rolling process is to heat the steel billet and then roll it to obtain steel pipes of different specifications; the cold drawing process is to heat the steel billet and then perform perforation, tube drawing and other processes to finally obtain the required steel pipe.
2. Welded steel pipe
The production processes of
welded steel pipes mainly include arc welding and laser welding. The arc welding process is to weld the steel plate or steel strip after cutting and grinding to obtain the required steel pipe; the laser welding process is to use the laser beam to weld the steel plate or steel strip, which has the advantages of high precision and stable quality.
Performance requirements for high-pressure boiler tubes:
High-pressure boiler tubes need to have high strength, high pressure resistance, high corrosion resistance and other performance requirements. In high temperature and high pressure environments, the mechanical properties and corrosion resistance of steel pipes will be seriously affected, so special materials and processes need to be used to ensure their performance requirements. For example, stainless steel materials and high-precision welding processes are used.
Applications of high pressure boiler tubes:
High-pressure boiler tubes are widely used in electric power, chemical industry, petroleum, pharmaceutical and other fields. In the electric power industry, high-pressure boiler tubes are mainly used to manufacture boilers, pressure vessels and other equipment; in the chemical and petroleum industries, high-pressure boiler tubes are mainly used to transport high-temperature, high-pressure, and highly corrosive fluids; in the pharmaceutical industry, high-pressure boiler tubes Mainly used for the preparation of high-purity drugs and high-precision experimental equipment.
Why are the pipes used in industrial boilers all seamless steel pipes?
Seamless steel tube boilers use high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel tubes to manufacture the heating surface of pressure water tube boilers for high pressure and above. These boiler tubes often work under high temperature and pressure. Under the action of high temperature flue gas and water vapor, the tubes will be oxidized and corroded. Therefore, steel pipes are required to have high durability, high oxidation resistance and good structural stability.
Industrial boiler tubes are mainly seamless steel tubes because the performance indicators of seamless steel tubes can fully meet the requirements of boiler applications. Although the cost is high, its safety and reliability are high. Low-pressure fluid transportation pipelines within 2Mpa generally use welded steel pipes. High-temperature and high-pressure equipment such as industrial boilers must use seamless steel pipes, and the pipe wall thickness is correspondingly thicker.
Today, welded steel pipes are also used in medium and low-pressure boilers, thanks to the rapid improvement of welding technology. For example, the joint microstructure of pipe butt friction welded steel pipes is the same. After the pipe joints are remelted through butt joints and corner joints, it is difficult to observe block joint traces with the naked eye. The microstructure of its various parts has always been exactly the same.
Common problems in surface treatment and product processing of seamless steel pipes for high-pressure boilers:
1. The surface of seamless steel pipes for high-pressure boilers is inconsistent: only the welds are pickled and passivated, resulting in uneven surfaces and affecting the appearance.
2. The scratches on the seamless steel pipe for high-pressure boilers are difficult to remove: the entire pipe has been pickled and passivated. Various scratches produced during the processing cannot be removed, and the scratches and welding spatter attached to the stainless steel surface cannot be removed. Carbon steel, spatter and other impurities. In the presence of corrosive media, chemical corrosion or electrochemical corrosion will cause rust.
3. Welding seam defects: Welding seam defects are relatively serious, and manual and mechanical grinding methods are used to make up for them. The resulting wear marks will cause uneven surfaces and affect the appearance.
High pressure boiler tube market prospects:
With the continuous development of industrial production, the market demand for high-pressure boiler tubes is also growing. In the next few years, the high-pressure boiler tube market will show the following trends:
1. Market competition intensifies: With the increase of domestic high-pressure boiler tube companies and the improvement of technical level, market competition will become increasingly fierce. Enterprises need to continuously improve product quality and technical level, and strengthen brand building and marketing to improve competitiveness.
2. Growth in demand for high-end products: With the upgrading of industrial production and the development of high-end manufacturing, the demand for high-end high-pressure boiler tube products will continue to grow. Enterprises need to increase investment in technology research and development and innovation, and actively develop new products and technologies to meet market demand.
3. Increased environmental protection and energy saving requirements: With the improvement of environmental protection and energy saving awareness, the environmental protection and energy saving requirements for high-pressure boiler tubes will also become higher and higher. Enterprises need to strengthen technological research and application in environmental protection and energy conservation, and actively promote energy-saving, emission reduction and environmentally friendly products.
Read more: Seamless Mechanical Steel Tubing
