Selection of seamless pipes and welded pipes

When choosing between seamless and welded pipes, multiple factors need to be considered, including the use environment, pipe specifications, material quality and cost. The following is a detailed comparison and selection recommendations for the two types of pipes:

1. The difference between seamless pipes and welded pipes

Production process

Seamless pipe: Made by rolling a whole piece of steel billet through multiple processes such as rolling and drawing, without welded joints.

Welded pipe: The steel plate is rolled into a tube shape, and then butt-welded, including spiral welding and straight welding.

Appearance

Seamless pipe: The surface is seamless and the performance is good.

Welded pipe: There are weld ribs on the inner wall, which are welded after rolling.

Performance

Seamless pipe: Strength, pressure resistance, corrosion resistance and sealing are usually better than welded pipes, and can withstand higher pressures.

Welded pipe: Generally can withstand a pressure of about 10MPa, but the performance of welded pipes treated with special processes (such as seamless splicing) will be improved.

Application

Seamless pipe: Mainly used in high-pressure, high-temperature and high-demand working conditions, such as petroleum, natural gas, chemical industry, nuclear power and other fields.

Welded pipe: widely used in general engineering construction, municipal engineering, bridges, structural engineering and other fields.

2. Selection suggestions

Consider the use environment

Under high temperature, high pressure or corrosive environment, seamless pipes should be given priority to ensure the safety and reliability of the system.

In general construction or low-pressure transmission occasions, welded pipes are an economical and practical choice.

Pay attention to pipe specifications

Choose appropriate pipe specifications according to project requirements, including diameter, wall thickness, length, etc. The overall layout and fluid characteristics of the pipeline system should be fully considered to ensure that the selected pipe meets the project requirements.

Pay attention to material quality

Whether it is seamless pipe or welded pipe, material quality is the key factor in determining its performance and service life. Attention should be paid to indicators such as the chemical composition, mechanical properties, and corrosion resistance of the material to ensure that the selected pipe meets the relevant standards and specifications.

Consider cost factors

The production process of seamless pipes is more complex and sophisticated, so the production cost is usually higher. On the premise of meeting the needs of the project, cost factors should be comprehensively considered to select pipes with higher cost performance.

In summary, seamless pipes and welded pipes each have their own characteristics and applicable scenarios. In practical applications, the most suitable pipe type should be selected based on comprehensive considerations such as specific engineering requirements, use environment, pipe specifications, material quality and cost factors.