What Are the Types of Steel Pipes and Their Applications? Pros and Cons of Welded Pipe, Round Pipe, Square Pipe, Rectangular Pipe and Seamless Pipe

1. Welded Steel Pipe: Cost-Effective General Structural Pipe

Introduction

Pros

• Lowest purchase cost among five steel pipes, fast delivery and complete specifications;

• Easy to cut, bend and weld, convenient for on-site secondary processing;

• Smooth surface with good adhesion for galvanizing and paint coating.

Cons

• Weld seam reduces overall pressure resistance, unavailable for high-pressure and high-temperature medium transportation;

• Poor fatigue resistance, easy to crack under long-term vibration;

• Weld seam is vulnerable to rust in coastal high salt fog areas.

Applications

2. Round Steel Pipe: Ideal Pipe for Fluid Transportation and Scaffolding

Introduction

Pros

• Minimum inner resistance for efficient water and gas transportation;

• Balanced compression and torsion resistance without partial deformation;

• Light weight, easy assembly and high turnover rate for construction scaffolding.

Cons

• Curved surface leads to low flat fitting efficiency for plate connection;

• Weak unidirectional bending resistance, not suitable for main vertical load-bearing columns;

• Unstable stacking status and larger storage space occupation.

Applications

3. Square Steel Pipe: Preferred Material for Building Load-Bearing Columns

Introduction

Pros

• Flat four sides ensure high-precision welding and bolt connection;

• Excellent vertical compression and bending resistance, 25% higher vertical bearing capacity than round pipe with the same wall thickness;

• Space-saving stacking and neat appearance without extra decoration.

Cons

• Large inner fluid resistance, not applicable for long-distance medium transportation;

• Stress concentration on four corners, easy to deform under strong impact.

Applications

4. Rectangular Steel Pipe: Special Pipe for Irregular Steel Structures

Introduction

Pros

• Dual-direction differentiated stress bearing, perfect for roof purlins and horizontal beams;

• High space utilization rate, suitable for steel structures with limited floor height;

• Higher overall rigidity and anti-deformation performance than standard square pipe.

Cons

• Low universality, most special sizes need customized production;

• Slightly higher material cost than ordinary square steel pipe.

Applications

5. Seamless Steel Pipe: Premium Pipe for High-Pressure and High-Temperature Working Conditions

Introduction

Pros

• 20% higher pressure resistance than welded pipe, adapting to extreme high pressure, high temperature and low temperature environments;

• Outstanding acid and alkali corrosion resistance, suitable for coastal and chemical industrial zones;

• Excellent vibration and fatigue resistance, service life up to 50 years.

Cons

• Complex production process with the highest procurement cost;

• Insufficient spot supply and long production lead time;

• High processing difficulty and expensive on-site construction cost.

Applications

Conclusion