Difference between the standard specification of spiral steel pipe and precision steel pipe

Spiral steel pipes are widely used across various industries, including tap water engineering, petrochemicals, chemical production, power generation, agricultural irrigation, and urban infrastructure development. As one of the 20 key products prioritized in my country, spiral steel pipes serve numerous critical functions.

Applications of Spiral Steel Pipe:

For Liquid Transportation: Used in water supply and drainage systems.

For Gas Transportation: Suitable for transporting coal gas, steam, and liquefied petroleum gas.

For Structural Use: Employed in pile foundations, bridges, docks, roads, and building structures.

Production Process of Spiral Steel Pipe: Spiral steel pipes are produced by forming strip steel coils into a cylindrical shape at room temperature. The edges are then welded using an automatic double-wire, double-sided submerged arc welding process. The strip steel is gradually fed into the welding unit and rolled into a tube with a slight open gap, which is controlled by adjusting the pressing amount of the extrusion rollers. The weld gap is maintained between 1 to 3 mm, and the edges are aligned for welding.

Differences Between Spiral Steel Pipe and Precision Steel Pipe

Categories of Spiral Steel Pipe: Spiral steel pipes can be classified into two main types based on production methods:

- Spiral Steel Pipe: Manufactured with a continuous spiral seam.

- Straight Seam Steel Pipe: Often referred to simply as straight seam pipe.

Based on specific production processes, spiral steel pipes can be further divided into hot-rolled seamless pipes, cold-drawn pipes, precision steel pipes, hot-expanded pipes, cold-spun pipes, and extruded pipes. These pipes are typically made from high-quality carbon steel or alloy steel and can undergo either hot-rolling or cold-rolling (drawing). The primary feature of spiral steel pipes is that they are seam-free and can withstand higher pressures compared to other types.

Welded Steel Pipe Varieties:

Welded steel pipes differ from seamless pipes in that they are manufactured by rolling steel plates into tube shapes and welding the seams, either butt seam or spiral seam. These are categorized based on:

Welding Process: Includes furnace welding, electrical resistance welding, and automatic arc welding.

Seam Type: Comprises straight seam and spiral welded pipes.

Pipe Shape: Encompasses round welded pipes and special-shaped welded pipes (e.g., square or flat).

Welded steel pipes are used for various purposes such as low-pressure fluid transportation, gas pipelines, heating systems, and electrical conduits.

Precision Steel Pipes

Precision steel pipes, a more recent development, are known for their stringent tolerances in both internal and external dimensions. These high-precision pipes are cold-drawn or hot-rolled and have numerous advantages, including:

Oxide-free inner and outer walls

No leakage under high pressure

High dimensional accuracy and surface brightness

Ability to resist deformation after cold bending or expansion

No cracks during flattening tests

Precision steel pipes are ideal for producing hydraulic and pneumatic components, such as cylinders or oil cylinders, due to these characteristics.

Conclusion:

Spiral steel pipes and precision steel pipes serve critical roles across various industries. Spiral steel pipes are widely used for transporting liquids and gases, as well as providing structural support, while precision steel pipes meet the needs of high-precision applications in hydraulic systems. Understanding the differences between these two types helps in selecting the appropriate material for specific industrial applications.