Seamless pipe vs welded pipe: Which one is more durable and corrosion resistant?

Seamless pipe (smls pipe) and welded pipe have their own characteristics in durability and corrosion resistance, and the specific comparison is as follows:

1. Durability comparison

Seamless pipe:

Advantages: Seamless pipe generally has a longer service life because it has no welds, avoiding corrosion and fatigue damage that may occur in the weld area. In addition, the high strength and good mechanical properties of seamless pipes also make it perform well in various complex environments and not easy to deform or break.

Specific performance: The tensile strength of seamless pipes is more than 8 to 10 times that of ordinary steel, and it has good creep resistance and seismic resistance. These characteristics enable seamless pipes to maintain stable performance in long-term use, thereby extending their service life.

Welded pipe:

Features: Due to the presence of welds, the overall performance of welded pipes is relatively poor, and the weld area may become a weak link in the steel pipe, which is susceptible to corrosion and fatigue damage. However, with proper use and maintenance, welded pipes can also have a long service life.

Precautions: The service life of welded pipes also depends on the welding quality, the use environment, and the maintenance. If the welding quality is poor or the use environment is harsh and lacks necessary maintenance, the service life of the welded pipe may be affected.

2. Corrosion resistance comparison

Seamless pipe:

Advantages: Seamless pipes have excellent corrosion resistance and can resist the erosion of various corrosive media such as acid, alkali, salt and atmospheric environment. This is due to the high-quality materials and advanced anti-corrosion treatment technology used in the manufacturing process of seamless pipes.

Specific performance: Seamless pipes do not require regular maintenance, and their effective life is more than 15 years, showing extremely strong corrosion resistance.

Welded pipe:

Features: Although welded pipes also have certain corrosion resistance, they may be slightly inferior to seamless pipes. This is mainly because there may be defects or stress concentration in the weld area, which makes the area more susceptible to corrosion.

Improvement measures: In order to improve the corrosion resistance of welded pipes, necessary anti-corrosion treatment can be carried out after welding, such as coating anti-corrosion coatings or heat treatment.

Comprehensive comparison:

Durability: Seamless pipes are usually more durable than welded pipes due to their lack of welds, high strength and good mechanical properties. However, welded pipes can also have a long service life under correct use and maintenance.

Corrosion resistance: Seamless pipes are more excellent in corrosion resistance and can resist erosion by a variety of corrosive media, while welded pipes are relatively weak. However, through proper anti-corrosion treatment, the corrosion resistance of welded pipes can also be improved.

Application scenarios: Seamless steel pipes and welded steel pipes each have their own applicable application scenarios. Seamless steel pipes are more suitable for occasions that need to withstand high pressure, high temperature or corrosive environments, such as petroleum geological drilling, petrochemical equipment and other fields. Welded steel pipes are more suitable for some occasions that do not require high pressure, such as tap water projects, agricultural irrigation and other fields.

In summary, seamless pipes are generally superior to welded pipes in terms of durability and corrosion resistance. However, in actual applications, it is necessary to select suitable pipes according to the specific use environment and requirements.

Read more: ERW pipe vs Seamless pipe cost or China seamless steel pipe manufacturer