Seamless steel pipe for boiler
Classification:
Key words:
Boiler pipe
Seamless steel pipe for boiler
1. Definition And Characteristics
Seamless steel pipe for boilers, as the name suggests, is a seamless steel pipe used in boiler systems. It has a hollow cross-section and there are no welded seams throughout the tube, which ensures the strength and tightness of the tube. This type of steel pipe has excellent performance in high temperature and high pressure environments and can withstand various stresses and corrosion during boiler operation.
2. Classification And Use
Seamless steel pipe for boiler can be divided into general boiler pipe and high pressure boiler pipe according to the different use pressure and temperature.
General boiler tube: mainly used in the manufacture of water-cooled wall tubes, boiling water tubes, superheated steam tubes, superheated steam tubes for locomotive boilers, as well as large and small smoke tubes and arch brick tubes. These tubes are generally used at temperatures below 350 ℃, mainly by the 10, 20 carbon steel hot-rolled tube or cold-drawn tube manufacturing.
High-pressure boiler tubes: These tubes are used to manufacture superheater tubes, reheater tubes, gas ducts and main steam tubes of high-pressure and ultra-high-pressure boilers. These tubes are often in high temperature and high pressure conditions, need to have high enduring strength, high oxidation corrosion resistance and good organisational stability. Commonly used materials include high-quality carbon structural steel (such as 20G, 20MnG, etc.) and alloy structural steel (such as 15MoG, 20MoG, etc.).
3. Standards And Specifications
The production and inspection of seamless steel pipes for boilers follow a series of national and industry standards, such as GB3087-2008 Seamless Steel Pipes for Low and Medium Pressure Boilers and GB5310-2018 Seamless Steel Pipes for High Pressure Boilers. These standards specify the material, specifications, mechanical properties, inspection methods and other contents of the steel pipe.
In terms of specifications, there is a wide range of sizes of seamless steel pipe for boilers, with the outer diameter ranging from 10mm to hundreds of millimetres, and the wall thickness is also based on specific needs. For example, the GB5310-2018 standard specifies that the outer diameter of hot-rolled pipes ranges from 22 to 530mm, and the wall thickness ranges from 20 to 70mm; while the outer diameter of cold-drawn (cold-rolled) pipes ranges from 10 to 108mm, and the wall thickness ranges from 2.0 to 13.0mm.
4. The Production Process
Boiler seamless steel pipe production process mainly includes piercing, hot rolling (or cold rolling), heat treatment, inspection and other steps. Raw materials are usually round billets or ingots, after piercing to form a rough tube, and then processed into the required specifications of the steel pipe through hot or cold rolling and other processes. Steel pipes need to be inspected and tested several times during the production process to ensure that their quality meets the standard requirements.
5. Application Prospects
With the development of industry and the progress of boiler technology, seamless steel pipe for boiler is more and more widely used in energy, chemical industry, metallurgy and other fields. In the future, with the popularity of high-temperature and high-pressure boilers and high-efficiency boilers as well as the improvement of environmental protection requirements, the performance and quality requirements of seamless steel pipe for boilers will also be continuously improved. Therefore, seamless steel pipe for boiler manufacturers need to continuously strengthen technical research and development and product innovation to meet market demand.
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