Welded Pipe MS Black Pipe Manufacturer
We are ERW steel pipe direct manufacturer,authorized by API 5L & API 5CT
For welded type pipe, also have LSAW & SSAW PIPE
Difference ERW/ LSAW /SSAW
|
Feature |
ERW Pipe |
LSAW Pipe |
SSAW Pipe |
|
Key Differentiator |
Smooth, barely visible seam. No filler metal. High-frequency resistance weld. |
Single, straight, prominent seam. Made from heavy plates, not coil. |
Distinct, continuous spiral seam. Most flexible in diameter from a given coil width. |
|
Primary Raw Material |
Hot/Rolled Cold-rolled steel coil. |
Single steel plates (medium to heavy thickness). |
Hot-rolled steel coil. |
|
Size Range (Typical) |
Small to medium diameter. OD: 1/2" to 24". Thinner walls. |
Large diameter, heavy wall. OD: 20" to 60" and above. The choice for heavy-wall, large OD. |
Large to very large diameter. OD: 8" to 120" . Excellent for large OD with relatively thinner walls. |
|
Weld & Mechanical Properties |
Weld seam is heat-treated, making it comparable to the base metal. Good for uniform pressure. Not suitable for severe cyclic loading. |
Superior weld quality and strength. Excellent impact toughness. Lowest residual stress. The premium choice for high-pressure, critical applications. |
Good overall strength. The long spiral weld and higher residual stress make it less ideal for high-pressure dynamic services or low-temperature environments. |
|
Main Applications |
Low/medium-pressure fluid conveyance (water, gas), structural purposes (scaffolding, furniture, mechanical tubes). |
High-pressure oil & gas transmission pipelines, offshore lines, major plant piping, heavy load-bearing structures. |
Low/medium-pressure fluid transport (water, sewage), piling, foundation supports, wind turbine towers, structural columns. |
|
Cost & Economics |
Most cost-effective. High production efficiency, continuous process. |
Highest cost. Due to plate cost, complex forming, and stringent testing. A premium product. |
Competitive for large diameters. Efficient material use (coil), lower tooling cost for varying diameters. |
|
Common Int'l Standards |
API 5L, ASTM A53, ASTM A500, EN 10219, JIS G3444 |
API 5L (PSL2 common), ASTM A671, DNVGL-ST-F101, ISO 3183 |
API 5L, ASTM A139, EN 10217, SY/T 5037 |
|
Key Selling Points |
"Economical, smooth, and precise. Perfect for structural applications and standard fluid transport ." |
"Maximum safety and performance. For critical, high-pressure environments. The benchmark in pipeline integrity ." |
"Cost-efficient solution for large-diameter requirements. |
Recommendations:
For general purpose, structural, or low-cost fluid transport:RecommendERW.
For critical, high-pressure hydrocarbon pipelines or premium applications:SpecifyLSAW. It is the undisputed choice for integrity and safety in demanding service.
For large-diameter water lines, foundation piling, or structural columns where cost is a major factor:OfferSSAW.
ERW have welded seam inside of pipe
LSAW have welded seam both pipe inside and outside
SSAW shape is helical structure
