Threaded Pipe: An Efficient Solution for Industrial Applications

Threaded pipe is a type of pipeline product that forms a spiral convex structure on the surface of the pipe wall through a special process. Its unique geometric design endows it with mechanical properties and functional characteristics superior to traditional smooth pipelines. This article will comprehensively analyze the core value of this important industrial component from structural principles, manufacturing processes to application scenarios.

1、 Structural characteristics and working principle

The typical feature of threaded pipes is the continuous spiral protrusions distributed along the axial direction of the pipe wall, with a height typically ranging from 0.5-3mm and spacing adjusted according to the pipe diameter. This structure brings two core advantages: enhanced heat transfer capability and improved structural strength. In heat exchange scenarios, spiral protrusions can induce secondary eddies in fluids, disrupt laminar boundary layers, and increase convective heat transfer coefficients by 30% -50%. At the same time, the threaded structure is equivalent to increasing the effective heat transfer area, and the contact surface area increases by about 20% compared to the light tube under the same volume.

2、 Evolution of Manufacturing Processes

Modern threaded pipe production mainly adopts three forming technologies:

Cold rolling forming method: The metal tube is spun by a unit with paired rolling rolls, which can accurately control the thread parameters and is suitable for high-precision applications.

Hot spinning process: utilizing high-temperature plasticity of pipes for rotational extrusion, suitable for mass production of large-diameter thick walled pipes, with significant cost-effectiveness.

Mechanical processing method: using CNC lathe cutting to form, mainly used for customized production of special materials or irregular threaded pipes.

The combination of new composite processes such as 'cold rolling+heat treatment' can increase the yield strength of steel pipes to over 650MPa while maintaining good ductility.

3、 Diversified application scenarios

1. Energy and power system

In the economizer components of thermal power plants, threaded pipes can increase the heat transfer efficiency on the flue gas side by 40% and effectively reduce the exhaust gas temperature. The steam generator of the nuclear power plant adopts a double threaded tube bundle design, with a heat transfer power density of 8MW/m ³ per unit volume.

2. Chemical fluid transportation

The heavy oil transportation pipeline in the petrochemical plant adopts an internal thread structure, which can reduce the coking rate by 30%. The electrolyte circulation system in the chlor alkali industry uses titanium alloy threaded pipes, significantly improving corrosion resistance.

3. Mechanical structure strengthening

The hydraulic support of construction machinery adopts externally threaded reinforced pipes, which have a compressive strength twice that of plain pipes. The intake pipe of the automotive turbocharging system uses aluminum alloy threaded pipes to achieve a balance between lightweight and thermal conductivity.