UOE Pipe

UOE Pipe

High-strength Welded Pipe For Critical Infrastructure

Uoe pipe provides high-strength, large-diameter solutions for oil, gas, water, construction, petrochemical, and abrasive material transport.

UOE Pipe Longitudinal Submerged Arc Welde Large-Diameter UOE Pipe Corrosion-Resistant UOE Pipe +1 More

UOE Pipe

High-strength Welded Pipe For Critical Infrastructure

Uoe pipe provides high-strength, large-diameter solutions for oil, gas, water, construction, petrochemical, and abrasive material transport.

UOE Pipe Longitudinal Submerged Arc Welde Large-Diameter UOE Pipe Corrosion-Resistant UOE Pipe +1 More

UOE Pipe (U-ing, O-ing, Expanding Welded Pipe) is a premium Longitudinal Submerged Arc Welded (LSAW) pipe manufactured through the UOE process, known for its exceptional strength and precision. Ideal for oil and gas pipelines, water transmission, structural construction, petrochemical industries, piling, and abrasive material transport, UOE pipes meet standards like API 5L, ASTM A671, and GB/T3091-2008.

The UOE process involves forming steel plates into a U-shape, then an O-shape, followed by double-sided submerged arc welding (SAW) and mechanical expansion to ensure dimensional accuracy and stress relief. Available in diameters from 20 to 56 inches (508–1422 mm) and wall thicknesses from 6.4 to 40.0 mm, UOE pipes are designed for high-pressure and large-scale applications. Protective coatings like 3LPE or FBE enhance corrosion-resistant UOE pipe performance in harsh environments.

UOE pipes undergo rigorous testing, including ultrasonic, hydrostatic, and X-ray inspections, to ensure superior weld integrity and compliance with industry standards. The process’s high precision makes it ideal for demanding applications like offshore oil pipelines and petrochemical facilities, where reliability is critical.

Compared to JCOE or SSAW pipes, UOE pipes offer higher dimensional accuracy and weld quality, making them a preferred choice for high-pressure applications. Their robust construction ensures reliability in structural and fluid transport systems, particularly in challenging environments.

UOE pipes address challenges such as corrosion, high pressure, and structural demands, providing engineers with dependable large-diameter UOE pipe solutions for critical infrastructure, ensuring safety and longevity.

Process of UOE pipe

The process of producing UOE pipe involves the following main steps:

UOE manufacturing process

UOE manufacturing process

  1. Trimming: The longitudinal edges of the plate are trimmed by milling to bring the width to the required value, and the ends are beveled to form v-grooves for welding.
  2. Pre-bending: The edges of the plate are pre-bent to form a U shape using dedicated forming presses.
  3. U-forming: The U-shaped plate is then pressed using a U-forming press to form a J shape.
  4. O-forming: The J-shaped plate is then pressed using an O-forming press to form the final round shape.
  5. Welding: The edges of the plate are welded together longitudinally to form a continuous seam.
  6. Expanding: The welded pipe is then expanded to its final diameter using an expanding machine.
  7. Final processing: The UOE pipe is then subjected to various finishing processes, including trimming, end facings, weld testing, and coating, depending on the desired end-use application.

The UOE process is known for its ability to produce large-diameter pipes with high accuracy and consistency, making them suitable for use in the transportation of oil and gas, as well as in various other applications.

The UOE mill features the most advanced technology and process, achieves high production efficiency, stable product quality and is equipped with complete inspection equipments.

UOE mill adopts U & O forming, the formed pipes are welded inside through five internal welding stations with three wires, and welded outside through four external welding stations with three wires.

SSAW pipes combine cost efficiency with durability, making them ideal for large-scale infrastructure projects requiring large-diameter, high-capacity pipelines.

UOE Pipe Specifications

UOE Pipe Specifications

Industrial Materials

UOE Pipe Size Range and Specifications

UOE-formed Longitudinal Submerged Arc Welded (LSAW) pipes are manufactured to precise specifications, ensuring high-strength solutions for critical pipeline applications.

UOE pipes are available with an outside diameter of Φ508–1118 mm (20"–44"), wall thickness of 6.0–30.0 mm (1/4"–1"), and lengths of 9–12.3 m (30'–40'). They comply with quality standards such as API, DNV, ISO, DEP, EN, ASTM, DIN, BS, GB, and CSA, and are available in grades from API 5L A-X90 and GB/T9711 L190-L625, meeting diverse industrial requirements.

UOE pipes size range:

  • Outside Diameter： Φ508mm- 1118mm (20"- 44")
  • Wall Thickness： 6.0mm-30.0mm（1/4"-1"）
  • Length： 9m-12.3m (30'- 40')

Quality Standards： API、DNV、ISO、DEP、EN、ASTM、DIN、BS、GB、CSA

Grades： API 5L A-X90,GB/T9711 L190-L625

In accordance with different requirements of the customers, the welded pipe can be expanded either by mechanical or hydrostatic expander to improve dimensional accuracy, and eliminate residual stress.

UOE pipes offer precise sizing and robust quality, making them ideal for high-pressure, large-scale infrastructure projects.

Steel Pipe Classification, Standards and Main Products
Classification Standard Main Products
Steel Pipe for Fluid Service GB/T 14291 Welded pipe for mine fluid service
GB/T 3091 Welded pipe for low pressure fluid service
SY/T 5037 Spirally submerged arc welded steel pipe for pipelines for low pressure fluid service
ASTM A53 Black and hot-dipped galvanized welded and seamless steel pipe
BS EN10217-2 Welded steel tubes for pressure purposes - delivery technical conditions - part2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
BS EN10217-5 Welded steel tubes for pressure purposes - delivery technical conditions - part5: submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
Steel Pipe for Ordinary Structure GB/T 13793 Longitudinally electric resistance welded steel pipe
SY/T 5040 Spirally submerged arc welded steel pipe piles
ASTM A252 Welded and seamless steel pipe piles
BS EN10219-1 Cold formed welded structural hollow sections of non-alloy and fine grain steels - part1: Technical delivery conditions
BS EN10219-2 Cold formed welded structural hollow sections of non-alloy and fine grain steels - part2: tolerances, dimensions and sectional properties
Line Pipe GB/T 9711.1 Steel pipe for pipeline transportation system of petroleum and natural gas industries (Class A steel pipe)
GB/T 9711.2 Steel pipe for pipeline transportation system of petroleum and natural gas industries (Class B steel pipe)
API 5L PSL1/2 Line pipe
Casing API 5CT/ ISO 11960 PSL1 Steel pipe for use as casing or tubing for wells of petroleum and natural gas industries

The chemical composition ensures weldability, strength, and corrosion resistance for SAW pipe in demanding applications.

SSAW is not stocked rather can easily be sourced for projects across the below range
NOMINAL SIZE DN IMPERIAL SIZE OUTSIDE DIAMETER MM (Ø) WALL THICKNESS MM (t) TYPE LENGTH MASS KG/METRE
350 14" 355.6 6.4 SSAW 12 55.12
350 14" 355.6 9.5 SSAW 9 81.09
350 14" 355.6 9.5 SSAW 12 81.09
350 14" 355.6 12.7 SSAW 12 107.4
350 14" 355.6 15.9 SSAW 12 133.2
350 14" 406.4 25.4 SSAW 12 206.46
400 16" 406.4 6.4 SSAW 12 63.13
400 16" 406.4 9.5 SSAW 12 92.99
400 16" 406.4 12.7 SSAW 12 123.31
400 16" 406.4 15.9 SSAW 12 153.12
450 18" 457 6.4 SSAW 12 71.12
450 18" 457 9.5 SSAW 12 104.84
450 18" 457 12.7 SSAW 12 139.16
450 18" 457 15.9 SSAW 12 172.96
500 20" 508 6.4 SSAW 12 79.17
500 20" 508 9.5 SSAW 12 116.79
500 20" 508 12.7 SSAW 12 155.13
500 20" 508 15.9 SSAW 12 192.96
500 20" 508 16 SSAW 13 194.14
550 22" 559 12.5 SSAW 12 168.47
550 22" 559 16 SSAW 12 214.26
600 24" 610 6.4 SSAW 12 95.27
600 24" 610 9.5 SSAW 12 140.69
600 24" 610 12.7 SSAW 12 187.07
600 24" 610 15.9 SSAW 12 232.96
600 24" 610 17.48 SSAW 12 255.43
600 24" 610 20 SSAW 12 291.01
600 24" 610 25.4 SSAW 12 366.19
600 24" 610 31 SSAW 12 442.65
650 26" 660 10 SSAW 12 160.3
650 26" 660 12.7 SSAW 12 202.74
650 26" 660 20 SSAW 12 315.67
700 28" 711 9.5 SSAW 12 164.35
700 28" 711 12.7 SSAW 12 218.71
700 28" 711 15.9 SSAW 12 272.56
700 28" 711 20 SSAW 13 340.82
750 30" 762 9.5 SSAW 12 176.3
750 30" 762 12.7 SSAW 12 234.68
750 30" 762 15.9 SSAW 12 292.56
750 30" 762 20 SSAW 12 365.9
800 32" 813 9.5 SSAW 12 188.25
800 32" 813 12.7 SSAW 12 250.66
800 32" 813 16 SSAW 12 314.48
800 32" 813 20 SSAW 12 391.13
- - 820 16 SSAW 11.9 317.25
850 34" 864 7.9 SSAW 8 166.79
900 36" 914 9.5 SSAW 12 211.91
900 36" 914 12.7 SSAW 12 282.29
900 36" 914 15.9 SSAW 12 352.16
- - 900 20 SSAW 12 434.04
900 36" 914 20 SSAW 12 440.95
950 38" 965 9.5 SSAW 6.2 223.86
1000 40" 1016 10 SSAW 12 248.09
1000 40" 1016 16 SSAW 12 394.58
- - 1032 20 SSAW 7.2 499.15
1050 42" 1067 9.5 SSAW 12 247.76
1050 42" 1067 12.7 SSAW 12 330.21
1050 42" 1067 15.9 SSAW 12 412.16
1200 48" 1219 9.5 SSAW 12 283.37
1200 48" 1219 12.7 SSAW 12 377.81
1200 48" 1219 15.9 SSAW 12 471.76
1200 48" 1219 20 SSAW 12 591.38

Note:

Pipes can be sourced conforming to AS/NZS3678 Grade 350 L0 & manufactured to AS/NZS1163 tolerances & to grade C350 L0.

Pipes/piles can be sourced at longer lengths or with piling shoes spliced/welded to AS1554.1.

Chemical Composition and Mechanical Properties of Various Pipe Standards
Standard Grade Chemical Composition (max %) Mechanical Properties (min)
C Si Mn P S Tensile Strength (MPa) Yield Strength (MPa)
API 5CT H40 - - - - 0.030 417 417
J55 - - - - 0.030 517 517
K55 - - - - 0.300 655 655
API 5L PSL1 A 0.22 - 0.90 0.030 0.030 335 335
B 0.26 - 1.20 0.030 0.030 415 415
X42 0.26 - 1.30 0.030 0.030 415 415
X46 0.26 - 1.40 0.030 0.030 435 435
X52 0.26 - 1.40 0.030 0.030 460 460
X56 0.26 - 1.40 0.030 0.030 490 490
X60 0.26 - 1.40 0.030 0.030 520 520
X65 0.26 - 1.45 0.030 0.030 535 535
X70 0.26 - 1.65 0.030 0.030 570 570
API 5L PSL2 B 0.22 0.45 1.20 0.025 0.015 415 415
X42 0.22 0.45 1.30 0.025 0.015 415 415
X46 0.22 0.45 1.40 0.025 0.015 435 435
X52 0.22 0.45 1.40 0.025 0.015 460 460
X56 0.22 0.45 1.40 0.025 0.015 490 490
X60 0.12 0.45 1.60 0.025 0.015 520 520
X65 0.12 0.45 1.60 0.025 0.015 535 535
X70 0.12 0.45 1.70 0.025 0.015 570 570
X80 0.12 0.45 1.85 0.025 0.015 625 625
ASTM A53 A 0.25 0.10 0.95 0.050 0.045 330 330
B 0.30 0.10 1.20 0.050 0.045 415 415
ASTM A252 1 - - - 0.050 - 345 345
2 - - - 0.050 - 414 414
3 - - - 0.050 - 455 455
EN10217-1 P195TR1 0.13 0.35 0.70 0.025 0.020 320 320
P195TR2 0.13 0.35 0.70 0.025 0.020 320 320
P235TR1 0.16 0.35 1.20 0.025 0.020 360 360
P235TR2 0.16 0.35 1.20 0.025 0.020 360 360
P265TR1 0.20 0.40 1.40 0.025 0.020 410 410
P265TR2 0.20 0.40 1.40 0.025 0.020 410 410
EN10217-2 P195GH 0.13 0.35 0.70 0.025 0.020 320 320
P235GH 0.16 0.35 1.20 0.025 0.020 360 360
P265GH 0.20 0.40 1.40 0.025 0.020 410 410
EN10217-5 P235GH 0.16 0.35 1.20 0.025 0.020 360 360
P265GH 0.20 0.40 1.40 0.025 0.020 410 410
EN10219-1 S235JRH 0.17 - 1.40 0.040 0.040 360 360
S275JOH 0.20 - 1.50 0.035 0.035 410 410
S275J2H 0.20 - 1.50 0.030 0.030 410 410
S355JOH 0.22 0.55 1.60 0.035 0.035 470 470
S355J2H 0.22 0.55 1.60 0.030 0.030 470 470
S355K2H 0.22 0.55 1.60 0.030 0.030 470 470
Comparison of SSAW Pipes with LSAW and ERW Pipes
Feature SSAW Pipe LSAW Pipe ERW Pipe
Welding Process Spiral SAW Longitudinal SAW Electric Resistance
Diameter Range 20–100 inches 16–72 inches 1/8–24 inches
Wall Thickness 5.0–25.4 mm 6.0–40.0 mm 1.5–20 mm
Applications Water, piling, low-pressure systems Oil/gas, construction, high-pressure Water, gas, low-pressure
Weld Quality Moderate (Spiral Weld) High (Double-Sided SAW) Moderate
Cost Low to Moderate Moderate to High Low

SSAW Pipes offer cost-effective, large-diameter solutions compared to LSAW and ERW pipes, ideal for water, piling, and low-pressure applications. Below is a comparison of key features.

FAQ

A UOE pipe is a longitudinal submerged arc welded pipe formed through the U-O-E process, ideal for oil, gas, water, construction, and petrochemical applications.

Common grades include API 5L Grade B, Q345, ASTM A671 CC60, and others like X70, tailored to project needs.

- API 5L Grade B: C ≤0.28%, Si ≤0.45%, Mn ≤1.20%, P ≤0.03%, S ≤0.03%
- Q345: C ≤0.20%, Si ≤0.50%, Mn ≤1.70%, P ≤0.035%, S ≤0.035%, Cr ≤0.30%
- ASTM A671 CC60: C ≤0.21%, Si 0.13-0.45%, Mn 0.55-1.30%, P ≤0.035%, S ≤0.035%

- API 5L Grade B: Tensile ≥415 MPa, Yield ≥245 MPa, Elongation ≥23%
- Q345: Tensile ≥470 MPa, Yield ≥345 MPa, Elongation ≥21%
- ASTM A671 CC60: Tensile ≥415 MPa, Yield ≥220 MPa, Elongation ≥25%

Diameters from 20 to 56 inches (508–1422 mm), wall thicknesses from 6.4 to 40.0 mm, with lengths up to 12.2 m.

Ultrasonic, hydrostatic, X-ray, and magnetic particle inspections ensure weld integrity and compliance with standards.

Oil and gas pipelines, water transmission, structural construction, petrochemical transport, piling, and abrasive material conveyance.

3LPE, FBE coatings, or high-grade materials like Q345 protect against corrosion in harsh environments.

UOE pipes offer superior dimensional accuracy and weld quality for high-pressure, large-diameter applications compared to JCOE or SSAW pipes.

API 5L, ASTM A671, GB/T3091-2008, and other standards upon consultation.

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Standards and Specifications
  • • API 5L UOE pipe
  • • ASTM A671 UOE pipe
  • • GB/T3091-2008 UOE pipe
  • • UOE pipe standards
Applications
  • • UOE pipe for oil and gas pipelines
  • • Large-diameter UOE pipe for construction
  • • UOE pipe for water transmission
  • • UOE pipe for petrochemical transport
Material and Grades
  • • API 5L Grade B UOE pipe
  • • Q345 UOE pipe
  • • ASTM A671 CC60 UOE pipe
  • • UOE pipe materials
Manufacturing and Testing
  • • UOE pipe manufacturing process
  • • Longitudinal SAW UOE pipe production
  • • UOE pipe testing standards
  • • Corrosion-resistant UOE pipe quality assurance

Note: UOE pipes meet international standards, ensuring high performance and reliability. Contact suppliers for detailed specifications.

Industrial Applications

UOE Pipes are engineered for high strength, durability, and corrosion resistance, making them ideal for oil and gas pipelines, water transmission, structural construction, petrochemical transport, piling, and abrasive material conveyance, ensuring reliable performance in critical infrastructure projects.

Oil and Gas Pipelines

Transports crude oil, natural gas, and hydrocarbons over long distances with superior weld quality.

Water Transmission

Facilitates potable water, wastewater, and irrigation systems in urban and industrial settings.

Structural Construction

Provides structural support for high-rise buildings, bridges, and offshore platforms.

Petrochemical and Chemical

Ensures safe transport of chemicals and petrochemical products in processing facilities.

Piling and Foundation Works

Used as piling pipes for stable foundations in construction and offshore projects.

Conveyance of Abrasive Materials

Transports abrasive materials in industrial applications with high durability.

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