What is the difference between seamless steel pipe and welded pipe?

Steel pipe is a relatively common pipe material. It can be divided into different types such as seamless steel pipe and welded pipe. So what is the difference between seamless steel pipe and welded pipe?

What is the difference between seamless steel pipe and welded pipe?

1. Different process

Seamless steel pipes are made by perforating steel billets or solid tube blanks and processing them by hot or cold rolling. Welded pipes are made by bending and welding steel plates or strips.

2. Different appearance

There are no seams on the surface of seamless steel pipes. There are generally welded seams on the surface of the welded pipe.

3. Different wall thickness

The precision of seamless steel pipe is low, and the wall thickness is relatively thick. The steel pipe of the welded pipe has high precision, and the wall thickness is usually relatively thin.

4. Different raw materials

Seamless steel tubes use billets or solid tube blanks. Welded pipes use steel plates or strips.

5. Different performance

In terms of corrosion resistance, pressure bearing, high temperature resistance and other properties, seamless steel pipes are better than welded pipes.

6, the price is different

Seamless steel pipe is more expensive than welded pipe because the production process of seamless steel pipe is more complicated and its cost is higher.

7. Different functions

Seamless steel pipes are generally used as fluid pipelines that require special environments such as high pressure resistance and high temperature resistance. Welded pipes are usually used as low pressure fluid delivery pipes.

What to pay attention to when purchasing seamless steel pipes

1. When purchasing seamless steel pipes, it is necessary to check whether the specifications and models of seamless steel pipes meet the requirements. You can use a ruler to measure whether the length, curvature, wall thickness, etc. of the pipe are consistent with those marked in the product information. If there is an error, whether the error meets the relevant standard requirements.

2. When purchasing seamless steel pipes, it is necessary to pay attention to the quality of steel pipes. For example, there should be no cracks, scars and other defects on the surface of seamless steel pipes. Usually, regular and qualified seamless steel pipes have a certificate of qualification. Check whether the production date, batch number, factory name and other relevant information on the certificate are complete and so on.