Erw Welding Pipe Vs Seamless Tube

Steel pipes can generally be divided into two types: seamless steel pipes and erw welded pipes. Although both types of steel pipes are made of steel, their production processes and performance characteristics are different. In many fields, seamless steel pipes and erw welded pipes can be used, but their applications differ.

I. Erw Welded Pipes

Erw welded pipes are produced by welding steel plates or steel strips using welding processes, usually by tube mill machines. Welded pipes are generally cheaper than seamless steel pipes, but slightly inferior in quality.

The characteristics of welded pipes include relatively smooth internal and external surfaces. However, the quality at the weld seam may be relatively poor due to the presence of oxides and metal slag during the welding process. Additionally, the strength of erw welded pipes may sometimes be slightly lower than that of seamless steel pipes.

Welded pipes are widely used in construction, machinery manufacturing, bridge construction, automotive manufacturing, and other fields. These fields have less stringent requirements for pipe performance compared to industries such as petroleum and chemicals, making erw welded pipes suitable for their needs.

II. Seamless Steel Pipes

Seamless steel pipes are manufactured using cold drawing, cold rolling, or hot rolling processes. Some seamless steel pipes require multiple processes such as pickling, rust removal, rolling, and annealing before they can be produced.

The characteristics of seamless steel pipes include smooth internal and external surfaces, no weld seams, high density, high strength, and the ability to withstand high pressure. Additionally, seamless steel pipes have better corrosion resistance compared to ordinary welded pipes.

Seamless steel pipes are commonly used in industries such as petroleum, chemicals, aviation, and defense, where there are stringent requirements for pipe quality. The use of substandard steel pipes in these industries may pose safety hazards to personnel and equipment.

III. Comparison between Seamless Steel Pipes and Erw Welded Pipes

Seamless steel pipes and erw welded pipes differ in performance and application fields:

1. Production Process: Seamless steel pipes are formed through processes like rolling and drawing, while welded pipes are formed by welding steel plates or strips.

2. Quality: Seamless steel pipes typically have higher quality than welded pipes, and they also exhibit better corrosion resistance.

3. Price: Welded pipes are usually cheaper than seamless steel pipes.

4. Application Fields: Seamless steel pipes are mainly used in industries such as petroleum, chemicals, aviation, and defense, while welded pipes are widely used in construction, machinery manufacturing, bridge construction, and automotive manufacturing.

In conclusion, both seamless steel pipes and welded pipes have their own characteristics and advantages and disadvantages. The choice between the two types of steel pipes should be based on actual needs. If there is a higher budget and a need for higher quality, seamless steel pipes can be considered. However, if there are budget constraints, welded pipes may be more suitable.