A precision welded pipe manufacturer explains several key characteristics of precision welded pipes.

06 Jul,2021

A precision welded pipe manufacturer explains several key characteristics of precision welded pipes.

　　A precision welded pipe manufacturer explains several key characteristics of precision welded pipes.

　　First, compared with high-precision small-diameter thick-walled precision welded pipes, this type has stricter dimensional tolerances; therefore, maintaining dimensional reliability is essential. Since air quenching results in a relatively slow cooling rate, the precision welded pipe exhibits improved resistance to aging by virtue of its martensitic microstructure. The heat‑treatment characteristics of 45# precision welded pipe further enhance the overall capacity of residual martensite within the material.

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　　Second, to minimize distortion during heat treatment: due to the slender length and thick wall of small-diameter precision welded tubes, they are highly susceptible to deformation throughout the quenching process. Therefore, deformation must be strictly controlled. The heat‑treatment operation is a critical step; during the cooling phase, promptly performing stress‑relief leveling while the material remains in the low‑temperature martensitic state is a key factor in improving yield. Consequently, when heat treating these precision welded tubes, it is essential to clearly specify whether oil quenching or air cooling will be employed.

　　In addition, to minimize distortion during heat treatment, suspended heating is employed; for highly precise slide rails, high-frequency quenching in a vapor‑gas atmosphere and high-frequency quenching using positive ions are applied to further reduce deformation.

　　Third, high‑toughness, small‑diameter thick‑walled precision welded tubes primarily endure contact fatigue loads and must exhibit high strength. To achieve this, heat treatment—such as induction quenching and chemical heat‑treatment processes—is employed, followed by cryogenic quenching.

　　The storage areas and warehouses for thin-walled precision welded steel pipes and stainless steel sheets should be located in clean, well‑drained sites, away from factories and mining operations that generate harmful substances and dust. Ground vegetation and debris must be removed, and the surfaces kept free of contamination to ensure the cleanliness of the stainless steel materials.

　　Within the warehouse, stainless steel sheets must not be stacked together with acidic, alkaline, saline, or other materials that may adhere to their surfaces. Different grades of stainless steel must be stored separately to prevent confusion and avoid contact corrosion. Large and medium-sized items, such as structural steel plates, 45# precision welded pipes, precision bright‑finished tubes, precision seamless steel pipes, precision welded pipes, and small‑diameter thick‑walled precision welded pipes, as well as large‑diameter seamless pipes and cast steel components, may be stored outdoors.

　　What is small-diameter precision welded pipe?

　　After the tube billet undergoes continuous rolling on an automatic rolling mill, its wall thickness is finally uniformed by a finishing mill, and it is subsequently sized on a sizing mill to meet specified dimensional requirements. Producing small-diameter precision welded tubes by hot rolling on a continuous rolling mill is an advanced method, typically carried out on a two-roll mill, where such tubes are rolled using an annular pass consisting of variable‑section circular holes and a stationary conical plug. Cold drawing is usually performed on single‑ring or double‑ring cold‑drawing machines using an extrusion process: the heated tube billet is placed inside a sealed extrusion cylinder, and the piercing mandrel moves in tandem with the extrusion rod, forcing the material through a small die opening to produce small‑diameter precision welded tubes.

　　Small-diameter precision welded tubes are seamless tubes with tight dimensional tolerances and excellent surface finish, commonly used in mechanical structures and hydraulic equipment. Using precision seamless tubes to manufacture such components significantly reduces machining time, enhances material utilization, and helps improve product quality.


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