Multi-rifled Seamless Steel Tube

Seamless Multi Rifled Boiler Steel Tubes

Cold-drawn internally threaded steel pipe is a pipe with a special thread structure, mainly used for connecting with other pipe fittings, valves or equipment. This kind of pipe has threads engraved on the inside and can be easily connected to other parts with corresponding external threads, thus providing a stable and reliable connection.
Internally threaded steel pipes are widely used in various industries, such as piping systems, valves, equipment, etc. It has excellent connection performance and stability. Internally threaded steel round pipes can also choose different materials and specifications according to different application scenarios. For example, carbon steel, stainless steel, alloy steel, etc. can be used to make internally threaded steel pipes to meet the needs of different environments and uses.

Multi-rifled seamless steel tube are produced to meet specific end use requirements, specifications, tolerances and chemistries.

 Chemical Composition (%)

Mechanical Properties

Seamless Multi Rifled Boiler Steel Tubes

Welding and processing of internally threaded pipes
The welding method is to directly roll the copper strip into threads and then weld them.
The production process is as follows
High-precision copper strip → thread rolling → forming and welding → sizing → finishing and coiling → annealing → packaging.
The main raw material of welded pipe is TP2 copper strip. During production, the copper strips are welded head to tail to ensure continuous operation of the production line. The copper strip first goes through the thread rolling process, and different numbers of embossing rollers are selected according to the shape of the thread.
The copper strip pressed through the thread is formed by several forming rollers and then high-frequency welded. In order to ensure the uniformity and size of the pipe diameter, after welding, the outer burrs are first removed with a scraper, and then the diameter is determined by the sizing roller to ensure that the outer diameter and ovality of the pipe meet the technical requirements.

Internally threaded pipes are also called dry steam pipes, internally ribbed pipes or internally finned pipes. In central air conditioners, it is mainly used in dry evaporators. During heat exchange, the refrigerant outside the tube is cooled by the evaporation and expansion of the refrigerant in the tube. It is also used in household and commercial air conditioner heat exchangers or in high heat pipes. The internal surface area per unit length of internally threaded pipes is 1.5 to 2 times that of ordinary smooth copper pipes, and its heat transfer coefficient is 1.5 to 2.4 times that of smooth copper pipes of the same specification. The flow resistance of the carrier only increases by 3-5%, which can save 20-35% of energy, and the weight of the entire refrigeration air conditioner is reduced by 10-25%.

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