Types of Carbon Steel Pipes
Carbon steel pipes can be classified based on their manufacturing methods as follows:
1. Seamless Steel Pipe (SMLS)
- Made by piercing a solid billet and extruding it into a hollow tube.
- No welding seam, stronger under high pressure.
- Applications: High-pressure oil/gas, boilers, hydraulic systems.
2. Welded Steel Pipe
(a) ERW (Electric Resistance Welded) Pipe
- Formed by rolling steel strip and welding edges using electric resistance.
- Straight seam, cost-effective.
- Applications: Water/gas pipelines, structural uses.
(b) LSAW (Longitudinal Submerged Arc Welded) Pipe
- Made by bending and welding steel plates longitudinally (SAW process).
- Single straight seam, used for large diameters.
- Applications: Oil/gas transmission, offshore pipelines.
(c) SSAW (Spiral Submerged Arc Welded) Pipe
- Formed by spirally coiling steel strip and welding with submerged arc.
- Helical seam, better stress distribution.
- Applications: Large-diameter pipelines, piling.
Carbon Steel Pipes Standards
| Type | Process | Key Feature | Common Standards |
|---|---|---|---|
| Seamless | Hot extrusion, cold drawing | No weld, high strength | ASTM A106, API 5L, ASTM A252 |
| ERW | Electric resistance welding | Straight seam, economical | ASTM A53 (E), EN 10255, EN10219, BS1387 |
| LSAW | Longitudinal submerged arc welding | Thick-walled, large diameter | API 5L, ASTM A671, ASTM A252 |
| SSAW | Spiral submerged arc welding | Helical seam, stress-resistant | API 5L, ASTM A252 |
Post time: Jul-18-2025