Seamless Cold Drawn Multi-Rifled Boiler Tubes
What is internally threaded steel pipe?
Internally threaded pipes are made with one or several spiral rifling lines on the inner wall of the pipe, which look like rectangular grooves in cross-section. Internally threaded pipes are also called dry steam pipes, internally ribbed pipes or internally finned pipes. It is mainly used in dry evaporators in central air conditioners.
Internally threaded pipe is a pipe with a special thread structure, mainly used to connect with other pipe fittings, valves or equipment. Its internal thread design allows the pipe to be easily tightened to other components with corresponding external threads. This connection method is not only convenient and fast, but also ensures the stability of the connection.
In subcritical steam power plants, the application of internal ribbed tubes is particularly important. In a high-temperature and high-pressure environment, the water in the water-cooled wall pipe is prone to film boiling, which results in a reduction in heat transfer efficiency, an increase in pipe temperature, and may even cause a boiling explosion. The inner surface design of the threaded pipe can effectively suppress film boiling and improve heat transfer efficiency, thus ensuring the safe operation of the equipment.
Dry steam pipes are commonly used in various industries such as piping systems, valves, equipment, etc., especially in liquid and gas transmission, water supply systems, and HVAC systems. Its excellent connection performance and stability make it an ideal choice for various projects.
Multi-rifled seamless steel tube are produced to meet specific end use requirements, specifications, tolerances and chemistries.
Grade and Chemical Composition (%)
Mechanical properties
Seamless Multi Rifled Boiler Steel Tubes
Heat treatment system
Material (Grade) | Heat treatment |
20G | Normalizing at 900℃~930℃, the holding time is 1min/mm according to the wall thickness, but should not be less than 12min. |
20MnG | Normalizing at 900℃~930℃, the holding time is 1min/mm according to the wall thickness, but should not be less than 12min. |
25MnG | Normalizing at 900℃~930℃, the holding time is 1min/mm according to the wall thickness, but should not be less than 12min. |
12CrMoG | 900°C~930°C normalizing; 670°C~720°C tempering, holding time: Periodic furnace is more than 2h, continuous furnace is more than 1h. |
15CrMoG | Normalizing at 930°C~960°C; tempering at 680°C~720°C, holding time: periodic furnace greater than 2h, continuous furnace greater than 1h. |
When installing internally threaded round pipe, specific tools such as a wrench or wrench socket are required to ensure a correct threaded connection. During installation, avoid damaging the threads to avoid affecting the tightness of the connection. In addition, regular maintenance inspections are also crucial to ensure system stability and reliability.
Gnee Factory environment
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