Straight Seam Steel Pipe

Straight seam steel pipe,also known as longitudinal welded steel pipe,is a steel pipe with a straight longitudinal weld seam formed by cold bending steel plates or steel strips into a cylindrical shape,then welding the joint along the pipe length.It is one of the most common welded steel pipes,featuring simple production technology,high output,cost-effectiveness and flexible specifications.

Main Production Process

The steel strip is uncoiled,leveled,edge-trimmed,roll-formed into a round tube,and then welded by high-frequency resistance welding,submerged arc welding or other welding methods.After welding,processes such as sizing,straightening,cutting and non-destructive testing are carried out to ensure overall structural stability and sealing performance.

Core Features

Stable Structure&High Precision

Uniform pipe roundness,smooth inner and outer walls,accurate outer diameter and wall thickness tolerance,convenient for cutting,installation and connection.

Economical&Cost-Efficient

Lower production cost compared with seamless steel pipes and spiral steel pipes,with short delivery cycles and large-scale supply capacity.

Excellent Weld Quality

The straight weld has a simple structure and is easy for flaw detection.Overall pressure resistance and bending performance meet general industrial and engineering usage standards.

Rich Specifications

Available in multiple diameters,wall thicknesses and materials,customizable for different working conditions.

Material Grade

Common materials include Q235B,Q355B,SS400,GR.B carbon steel and other low-carbon structural steels.Custom alloy and weathering steel grades are optional on request.

Application Range

Water supply and drainage pipelines,municipal engineering piping

Building structure,steel frame support,guardrail and pipeline support

Low-pressure fluid transportation for oil,gas and general industrial media

Agricultural irrigation,fire protection pipelines and ventilation engineering

Machinery manufacturing,pipeline matching for general equipment

Advantages Comparison

Compared with spiral welded pipes,straight seam steel pipes have shorter welding seams,fewer welding defects and higher dimensional accuracy.Compared with seamless steel pipes,it has obvious price advantages and better cost performance for conventional low and medium pressure scenarios.