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LONGITUDINAL WELDED PIPES
Longitudinal welded steel pipes can be classified based on the material they are made of, such as carbon steel, stainless steel, alloy steel, etc. Each material type with its own set of standards and specifications.
High Strength & Durability: Engineered to withstand high pressure and mechanical stress.
Wide Range of Specifications: Available in multiple steel grades and coating options to suit various environments.
Precision Manufacturing: Conforms to strict international standards, ensuring consistent quality.
Corrosion Resistance: Optional surface coatings such as 3PE, epoxy, bitumen, and black oil protect against harsh environments.
Tested & Certified: Undergoes chemical, mechanical, and technical tests with certified mill test reports (EN 10204/3.1B).
Process:
LSAW – UO(UOE)、RB(RBE)、JCO(JCOE)
DSAW -Double Submerged Arc Welded
Out Diameter: 355.6mm– 1626mm
Wall Thickness: 8 -50mm
Length: up to 12m
Steel Grade:
API 5L: GR B, X42,X46, X56, X60,X65,X70
ASTM A53: GR A, GR B, GR C
EN: S275, S275JR, S355JRH, S355J2H
GB: Q195, Q215, Q235, Q345, L175, L210, L245, L320, L360- L555
Surface: Fusion bond Epoxy coating, Coal Tar Epoxy, 3PE, Vanish Coating, Bitumen Coating, Black Oil coating as per the customer’s requirement
Test: Chemical Component Analysis, Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation), Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.
Mill Test Certificate: EN 10204/3.1B
Oil & Gas Pipelines: Transporting crude oil, natural gas, and petroleum products.
Water & Sewage Systems: High-pressure and long-distance water conveyance.
Industrial Applications: Structural and mechanical applications requiring high-strength steel pipes.
Infrastructure Projects: Bridges, construction supports, and other civil engineering structures.
| LONGITUDINAL WELED | ||||
| Type | Outer Diameter(mm) | Wall Thickness (mm) | Length (m) | Standards |
| ERW Steel Pipe | 21.3 ~ 660.4 （1/2‘’--26‘’） | 1.5~22.2 | 0.3~18 | ASTM 53, EN10217, DIN 2458. IS 3589, JIS G3452, BS1387 |
| SSAW Steel Pipe | 219.1 ~ 3048 (8″--120″) | 4~30 | 3～70 | ASTM A252, EN10217-1,2,5, EN10219-1, BS, JIS, IS |
| LASW Steel Pipe | 355.6 ~ 1820 | 5.0~50 | 3~12.5 | ASTM 53, EN10217, DIN 2458. IS 3589, GB/T3091, GB/T9711 |
API 5L Line Pipe: API 5L PSL1/PSL2 GR B , X42, X46, X52, X60, X65, X70
MECHANICAL PROPERTIES AND STEEL CHEMICAL COMPOSITION
STEEL GRADE | Yield strength, min. psi (MPa) | Tensil strength, min. psi (MPa) | Elongation in 2 in., min. % |
GR B | 245 | 415 |
|
X42 | 290 | 415 | |
X46 | 320 | 435 | |
X52 | 360 | 460 | |
X56 | 390 | 490 | |
X60 | 415 | 520 | |
X65 | 450 | 535 | |
X70 | 485 | 570 |
STEEL GRADE | % by mass, Maximum | ||||
C | Si | Mn | P | S | |
GR B | 0.26 | 0.40 | 1.20 | 0.030 | 0.030 |
X42 | 0.26 | 0.40 | 1.30 | 0.030 | 0.030 |
X46 | 0.26 | 0.40 | 1.40 | 0.030 | 0.030 |
X52 | 0.26 | 0.40 | 1.40 | 0.030 | 0.030 |
X56 | 0.26 | 0.40 | 1.40 | 0.030 | 0.030 |
X60 | 0.26 | 0.40 | 1.40 | 0.030 | 0.030 |
X65 | 0.26 | 0.40 | 1.45 | 0.030 | 0.030 |
X70 | 0.26 | 0.40 | 1.65 | 0.030 | 0.030 |
STEEL PIPES AS PER ASTM A53 GR. B:
MECHANICAL PROPERTIES AND STEEL CHEMICAL COMPOSITION
STEEL GRADE | Composition Max, % | ||||||||
C | Mn | P | S | Cu | Ni | Cr | Mo | V | |
GR B | 0.30 | 1.20 | 0.05 | 0.05 | 0.40 | 0.40 | 0.40 | 0.15 | 0.08 |
Q: What are longitudinal welded pipes?
A: Longitudinal welded pipes are steel pipes manufactured by welding along the length of the pipe. They are made using Submerged-Arc Welding (SAW) and are available in single or double-welded forms (LSAW and DSAW).
Q: What materials are used to make these pipes?
A: They are commonly made from carbon steel, stainless steel, and alloy steel. Specific steel grades include API 5L (GR B, X42–X70), ASTM A53 (GR A–C), EN (S275, S355), and GB (Q195–L555).
Q: What sizes are available?
Outer Diameter: 355.6 mm – 1626 mm
Wall Thickness: 8 – 50 mm
Length: up to 12 meters
Q: What coatings and surface treatments are available?
A: Various coatings are available to enhance corrosion resistance:
Fusion Bond Epoxy (FBE)
Coal Tar Epoxy
3PE Coating
Bitumen Coating
Black Oil Coating
Vanish Coating
Q: How are these pipes tested for quality?
A: They undergo rigorous testing, including:
Chemical component analysis
Mechanical tests: tensile, yield, elongation
Technical tests: flattening, bending, blow, impact tests
Hydrostatic testing and X-ray inspection
All pipes come with a Mill Test Certificate (EN 10204/3.1B).
