Tianjin Brisk Metalwork Co., Ltd. is one of the leading manufacturers and suppliers of cold formed lsaw steel pipe in China. We have world-leading production equipment and strong manufacturing capabilities. Please feel free to buy bulk durable cold formed lsaw steel pipe from our factory.
Tianjin Brisk Steel is one of the manufacturers of Cold Formed LSAW Steel Pipe / Cold-Formed Longitudinal Submerged Arc Welded Steel Pipe / SAWL Pipe / JCOE LSAW Pipe in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.
Manufacturing Process
- Cold Forming
Steel plates are progressively bent into a tubular shape at ambient temperature using JCOE or UOE dies (without heating to the recrystallization temperature). After forming, the pipe undergoes double-sided submerged arc welding and may undergo cold expansion for final sizing.
- LSAW = Longitudinal Submerged Arc Welded
Longitudinal seam submerged arc welding featuring automatic external submerged arc welding and a single longitudinal weld seam.
Understanding the cold-forming sequence helps engineering and procurement teams evaluate the material integrity and stress distribution of LSAW steel pipes:
- Progressive Cold-Molding (JCOE/UOE Process): Heavy structural steel plates are shaped at ambient temperatures using high-tonnage hydraulic presses into a "J", "C", "O", and "E" open-pipe geometry. Performing shape formation without high thermal input preserves the microstructural grain refinement achieved during thermo-mechanically controlled processing (TMCP) at the steel plate mill.
- Double-Sided Submerged Arc Welding (DSAW): The longitudinal seam is welded internally and externally using multi-wire submerged arc welding. Submerged beneath a protective granular flux layer, the deep-penetration weld line creates a solid molecular bond without risk of oxidation or atmospheric contamination.
- Mechanical Cold Expansion & Stress Equalization: After longitudinal welding, 100% of the pipe length undergoes full-body mechanical expansion. This crucial cold-working step neutralizes residual bending stresses, corrects minor ovality, and establishes strict outer diameter (OD) concentricity across the entire pipe length.
JCOE Production Process
Main Standard (Brisk Steel)
- API 5L PSL1 / PSL2 (Line pipe for oil and gas, X42–X70/X80)
- ASTM A252
- EN 10217 (Pipes for pressure purposes)
- EN 10219 / EN 10210 (For structural use)
- ASTM A53 (For Water Pipe)
Advantage Of LSAW Pipe
- Cold formed shaping ensures excellent roundness & tight dimensional tolerance
- Double-sided submerged arc welding, full weld penetration, stable weld performance
- Suitable for large diameter & heavy wall projects
- Optional cold expansion to release forming residual stress
LSAW VS ERW VS SSAW
| Item | Cold Formed LSAW Pipe | ERW Steel Pipe | SSAW Spiral Weld Pipe |
|---|---|---|---|
| Raw Material | Steel plate | Hot rolled steel coil | Steel coil |
| Forming Method | JCOE / UOE Cold forming | High frequency roll forming | Spiral roll forming |
| Weld Type | Double-sided submerged arc straight weld | High frequency resistance weld | Spiral submerged arc weld |
| OD Range | 325–1626mm | 21.3–610mm | 406–1420mm |
| Wall Thickness | 6–60mm (heavy wall available) | Thin & medium wall | Medium wall |
| Dimensional Precision | ★★★★★ High | ★★★★ | ★★★ |
| Pressure Resistance | High, fit for high-pressure oil & gas trunk lines | Medium pressure | General low-medium pressure fluid |
| Typical Application | Oil/gas transmission, foundation piling, chemical pipeline, marine structure | Construction, water supply, general piping | Municipal drainage, low-pressure water pipeline |
| Cost Level | Higher | Medium | Lowest |
Surface Treatment
FAQ
Q: What is Cold Formed LSAW steel pipe?
A: Cold Formed LSAW (Longitudinal Submerged Arc Welded) pipe is produced via JCOE/UOE cold forming process with steel plate at ambient temperature, then double-sided submerged arc welding. It is also known as SAWL pipe, widely used for large-diameter heavy-wall pipeline and structural projects.
Q: Can you offer anti-corrosion coating?
A: Yes. Options: black vanish, hot dip galvanized, FBE, 3LPE, 3PP internal & external coating.
Q: Is cold expansion available?
A: Optional cold expansion treatment to eliminate residual stress and improve roundness for strict pipeline projects.
Q: What's your minimum order quantity?
A: MOQ 25 tons for Brisk Steel factory.
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