Internally threaded seamless steel pipe, referred to as internally threaded pipe, refers to a seamless steel pipe with an inner wall processed into a spiral groove.
Compared with ordinary steel pipes, internally threaded pipes can effectively prevent the formation of a steam film between water and the steel pipe wall, increase the disturbance of the flow in the steel pipe, make the temperature of the steel pipe wall more uniform, prevent the steel pipe from burning, and improve the heat transfer of the boiler. efficiency.
Technical requirements for internally threaded pipes: In addition to meeting the general technical requirements for steel pipes, internally threaded pipes for high-pressure boilers should also have deviations in size and thread parameters according to the GB/T20409-2006 (internally threaded seamless steel pipes for high-pressure boilers) standard All have different regulations.
The number of thread heads of internally threaded pipes ranges from 4, 6, or 8 depending on the demand. The main materials are 20G, SA210C, T2, T12, 12cr1movg, 15crmog, T22, T23, etc.
