The choice between seamless pipe and welded pipe depends on the specific application scenario and requirements. The following are the main differences between the two and the selection recommendations:
1.Production process
Seamless pipe: manufactured by hot rolling or cold drawing process, without welds.
Welded pipe: made by welding steel plates or steel strips, with welds.
2. Strength and pressure
Seamless pipe: high strength, can withstand higher pressure, suitable for high pressure environment.
Welded pipe: lower strength, suitable for medium and low pressure environment.
3. Size and wall thickness
Seamless pipe: limited size and wall thickness range, usually used for smaller diameter and thicker wall thickness occasions.
Welded pipe: more size and wall thickness options, suitable for large diameter and thin wall requirements.
4. Surface quality
Seamless pipe: better surface quality, suitable for occasions with high appearance requirements.
Welded pipe: there may be defects at the weld, and the surface quality is slightly inferior.
5. Cost
Seamless pipe: high production cost and expensive price.
Welded pipe: low production cost and cheaper price.
6. Application fields
Seamless pipe: high pressure and high temperature environment such as petroleum, natural gas, chemical industry, boiler, etc.
Welded pipe: medium and low pressure occasions such as construction, bridges, machinery manufacturing, water and coal gas transportation, etc.
7. Corrosion resistance
Seamless pipe: good corrosion resistance, suitable for corrosive environment.
Welded pipe: slightly poor corrosion resistance, but can be improved by galvanizing and other treatments.
Selection suggestions
High pressure, high temperature, corrosive environment: choose seamless pipe.
Medium and low pressure, large diameter, thin wall, cost sensitive**: choose welded pipe.
Summary
Seamless pipe and welded pipe have their own advantages and disadvantages. When choosing, you should consider the factors such as pressure, size, cost and application environment.
