Main Differences Between Seamless and Welded Steel Pipe
1.Manufacturing Process
Seamless steel pipe
Made by heating a solid steel billet and piercing it to form a hollow tube,no welding seam on the pipe body.
Welded steel pipe
Made by rolling steel plate or steel strip into a tube shape,then welding the longitudinal or spiral seam together.
2.Strength&Pressure Resistance
Seamless pipe:Higher strength,better pressure resistance,good roundness,less risk of leakage.
Suitable for high pressure,high temperature,and critical applications.
Welded pipe:Strength is slightly lower at the weld seam;generally used for medium/low pressure.
3.Wall Thickness&Size Range
Seamless pipe:
Can produce thicker wall thickness,larger outside diameter,and heavy-wall tubes.
Size accuracy is relatively lower.
Welded pipe:
Mostly thin to medium wall thickness;
better dimensional accuracy,smoother surface,more uniform size.
4.Cost&Production Efficiency
Seamless pipe:Higher production cost,longer process,higher price.
Welded pipe:Higher production efficiency,lower cost,more affordable price.
5.Application Scenarios
Seamless steel pipe
Oil and gas transmission
Boiler tubes,heat exchanger tubes
High-pressure hydraulic systems
Petroleum,chemical,power generation
Mechanical structural tubes with high strength requirements
Welded steel pipe
General water supply and drainage
Construction scaffolding
Fence,steel structure
Low-pressure fluid pipelines
Decoration and general engineering
6.Appearance
Seamless pipe:No weld line visible.
Welded pipe:Obvious welding seam on the surface(can be removed by further processing).
GB/T 7714
Wang Xiaoxiang.Competition Between Welded Pipes and Seamless Pipes from the Perspective of Production and Application[J].Welded Pipe,2016,39(07):5-9
MLA
Wang,Xiaoxiang.“Competition Between Welded Pipe and Seamless Pipe from the Perspective of Production and Application.”Welded Pipe and Tube,vol.39,no.7,2016,pp.5-9.
APA
Wang,X.(2016).Competition between welded pipe and seamless pipe from the perspective of production and application.Welded Pipe and Tube,39(7),5-9.
