1. Womic Steel: Manufacturing Capabilities & Company Strength
Womic Steel Group is a premier manufacturer and global exporter with over 20 years of expertise in producing carbon, alloy, and stainless steel tubular products. Our state-of-the-art SSAW pipe production facility spans a comprehensive manufacturing capability exceeding 15,000 tons per month for spiral submerged arc welded high-strength line pipes, serving high-pressure oil and gas pipeline projects worldwide, including sour service and offshore applications.
Production Size Range for SSAW Steel Pipe: Outside diameter from 219mm to 3,500mm (8 inch to 138 inch) for SSAW process. Wall thickness from 5.0mm to 25.4mm. Single lengths from 6m to 18m standard, with custom lengths up to 60m available for pipeline projects.
Quality Certifications & Regulatory Compliance:
ISO 9001:2015 Certified: Quality Management System for SSAW pipe production and quality control processes, ensuring consistent product quality and continuous improvement across all manufacturing operations.
API 5L Monogram License: Womic Steel holds API 5L license for Line Pipe manufacturing, including X65 grade. The API Monogram represents our commitment to the highest industry standards for oil and gas transmission pipelines. Regular API audits ensure ongoing compliance with specification requirements.
CE Marking (PED 2014/68/EU): Our SSAW pipes comply with the European Pressure Equipment Directive (PED) 2014/68/EU. CE marking is available upon request.
EN 10204 3.2 Certification: In addition to standard 2.2 and 3.1 Mill Test Certificates, we supply products with Inspection Certificate 3.2, validated by EU-authorized third-party bodies (TÜV, LR, BV, SGS).
Third-Party Inspection (TPI) Approvals: Our products and production processes are approved and audited by major international agencies including SGS, BV, ABS, LR, DNV, GL, and TÜV.
Additional Certifications Available: ISO 14001:2015, ISO 45001:2018, NORSOK M-650
Global Recognition: Womic Steel is a trusted supplier to global EPC contractors, pipeline companies, and energy companies, serving over 80 countries across Southeast Asia, Europe, the Middle East, Africa, and the Americas.
2. API 5L X65: Material Composition & Performance Characteristics
API 5L X65 is a high-strength grade in the API 5L line pipe specification, offering a minimum yield strength of 450 MPa (65,300 psi) and minimum tensile strength of 535 MPa (77,600 psi). The "X" designation indicates high-strength line pipe, and "65" represents the minimum yield strength in ksi (thousand pounds per square inch). X65 is widely used for high-pressure oil and gas transmission pipelines, sour service applications, and offshore pipelines where higher strength is required.
API 5L X65 offers excellent weldability for field joining, good low-temperature toughness for challenging environments, and sufficient ductility for bending and forming. Compared to X52, X65 provides approximately 25% higher yield strength, allowing for thinner walls, reduced weight, and higher operating pressures. PSL2 grade offers guaranteed impact toughness, maximum hardness limits for sour service, and stricter chemical composition limits.
Chemical Composition (Ladle Analysis, % by mass):
| Element | API 5L X65 PSL2 (Max %) |
| C | 0.18 |
| Mn | 1.45 |
| P | 0.025 |
| S | 0.015 |
| Si | 0.45 |
| V | 0.10 |
| Nb | 0.05 |
| Ti | 0.04 |
| CE (max) | 0.43 |
Note: API 5L X65 PSL2 has stringent limits on carbon, phosphorus, and sulfur, resulting in excellent weldability and toughness. The carbon equivalent (CEV) limit of 0.43% ensures good field weldability for high-strength pipelines. For sour service, additional limits on hardness and specific elements apply.
Mechanical Properties (Room Temperature):
| Property | API 5L X65 PSL2 |
| Yield Strength (min) | 450 MPa (65,300 psi) |
| Tensile Strength (min) | 535 MPa (77,600 psi) |
| Elongation (min) | 18% (for 50mm gauge) |
| Hardness (max) | 90 HRB / 200 HV (sour service) |
| Impact Toughness | 27 Joules @ 0°C (typical) |
*Note: API 5L X65 PSL2 offers guaranteed impact toughness and stricter chemical composition limits, making it suitable for sour service and low-temperature applications. PSL1 is available for less demanding projects.*
Comparison of API 5L High-Strength Line Pipe Grades:
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Typical Application |
| X52 | 360 | 460 | Medium to high pressure pipelines |
| X60 | 415 | 520 | High pressure pipelines |
| X65 | 450 | 535 | Very high pressure, sour service, offshore |
| X70 | 485 | 570 | Ultra-high pressure, long-distance pipelines |
*Note: For the most demanding high-pressure pipeline projects requiring the highest strength and sour service capability, API 5L X65 or X70 should be considered.*
3. Dimensional Range & Standards Compliance
Womic Steel supplies API 5L X65 SSAW steel pipes across a wide dimensional spectrum, fully compliant with API 5L PSL1 and PSL2 requirements. The SSAW (Spiral Submerged Arc Welded) process is ideal for large diameter, high-strength pipeline applications.
| Item | Specification |
| Standard | API 5L PSL1 / PSL2 (X52, X60, X65, X70) |
| Manufacturing Process | SSAW (Spiral Submerged Arc Welded) - 219mm-3,500mm OD |
| Outside Diameter Range | 219mm – 3,500mm (8" – 138") |
| Wall Thickness Range | 5.0mm – 25.4mm |
| Length Range | Standard: 6m, 12m, 18m / Custom: up to 60m |
| End Finish | Plain End (PE) / Beveled End (BE) |
| Surface Finish | Bare / Oiled / Black Coated / 3PE / FBE / Coal Tar Epoxy |
| Tolerances | OD: ±0.5% / WT: -0% +15% (API) / Length: +50mm -0mm |
4. Available Dimensions & Specifications - API 5L X65 SSAW Steel Pipe
SSAW High-Strength Steel Pipe (219mm – 3,500mm OD)
| OD (mm) | Wall Thickness (mm) Options | Weight (kg/m) | Standard Length |
| 219 – 325 | 5.0, 6.0, 8.0, 10.0, 12.5 | 26.4 – 96.3 | 6m / 12m |
| 325 – 426 | 5.0, 6.0, 8.0, 10.0, 12.5, 14.0 | 39.5 – 142.2 | 6m / 12m |
| 426 – 530 | 6.0, 8.0, 10.0, 12.5, 14.0, 16.0 | 62.1 – 202.8 | 6m / 12m / 18m |
| 530 – 630 | 6.0, 8.0, 10.0, 12.5, 14.0, 16.0, 18.0 | 77.5 – 271.6 | 6m / 12m / 18m |
| 630 – 820 | 6.0, 8.0, 10.0, 12.5, 14.0, 16.0, 18.0, 20.0 | 92.3 – 394.6 | 6m / 12m / 18m |
| 820 – 1,020 | 8.0, 10.0, 12.5, 14.0, 16.0, 18.0, 20.0, 22.0 | 160.2 – 541.5 | 6m / 12m / 18m |
| 1,020 – 1,220 | 8.0, 10.0, 12.5, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 199.8 – 736.5 | 6m / 12m / 18m / 24m |
| 1,220 – 1,420 | 10.0, 12.5, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 298.4 – 859.8 | 6m / 12m / 18m / 24m |
| 1,420 – 1,620 | 10.0, 12.5, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 347.7 – 983.2 | 6m / 12m / 18m / 24m |
| 1,620 – 2,000 | 12.0, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 476.1 – 1,217.4 | 6m / 12m / 18m |
| 2,000 – 2,500 | 12.0, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 588.5 – 1,527.2 | 6m / 12m / 18m |
| 2,500 – 3,000 | 12.0, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 736.5 – 1,841.7 | 6m / 12m / 18m |
| 3,000 – 3,500 | 12.0, 14.0, 16.0, 18.0, 20.0, 22.0, 25.0 | 883.7 – 2,158.4 | 6m / 12m / 18m |
Note: Custom dimensions outside these ranges available upon request.
5. Common High-Strength Line Pipe Standards Manufactured by Womic Steel
| Standard | Steel Grades | Typical Application |
| API Line Pipe Standards | ||
| API 5L PSL1 | GR.B, X42, X52, X60, X65, X70 | Standard quality line pipe |
| API 5L PSL2 | GR.B, X42, X52, X60, X65, X70 | Higher quality with impact/hardness requirements |
| ISO Equivalent | ||
| ISO 3183 | L245, L290, L360, L415, L450, L485, L555 | ISO equivalent of API 5L |
| Offshore Standards | ||
| EN 10225 | S355G8+M, S355G10+M, S420G1+QT, S460G1+QT | Offshore and marine structure steel |
| DNV-OS-B101 | S355, S420, S460 | DNV standard for offshore steel |
| Piling Standards | ||
| ASTM A252 | GR.1, GR.2, GR.3 | Steel pipe piles for deep foundation |
| EN 10248 | S235GP, S275GP, S355GP | Hot-rolled steel sheet piling and pipe piling |
Usage: High-pressure oil and gas transmission, sour service pipelines, offshore pipelines, subsea pipelines, gas gathering systems, high-pressure water injection lines, structural piling, marine foundations
6. Manufacturing Process - SSAW (Spiral Submerged Arc Welded) High-Strength Steel Pipe
SSAW Manufacturing Process for High-Strength Steel Pipe (219mm – 3,500mm OD):
Raw Material Inspection (Coil): Incoming hot-rolled steel coils are verified for chemical composition, mechanical properties, and surface quality against API 5L X65 PSL2 specifications. Each coil is assigned a unique heat number to ensure full material traceability throughout production.
Uncoiling & Leveling: Steel coils are loaded onto the uncoiler and fed through a precision leveling machine to flatten the strip, removing coil set and ensuring uniform flatness for consistent spiral forming.
Edge Milling & Trimming: Both longitudinal edges of the steel strip are milled and trimmed to precise width tolerance (±0.5mm). The edge preparation creates a clean, parallel surface essential for high-quality spiral weld formation.
Spiral Forming: The leveled strip is fed into a spiral forming machine at a controlled helix angle. The strip is continuously formed into a spiral cylindrical shape, with the edges aligned for welding.
Inner Submerged Arc Welding (SAW): The inner spiral seam is welded first using automatic submerged arc welding equipment with appropriate flux and wire combination. For X65 high-strength steel, specialized low-hydrogen welding consumables are used.
Outer Submerged Arc Welding (SAW): The outer spiral seam is welded immediately after the inner weld, using automatic submerged arc welding equipment.
Cutting to Length: The continuous spiral welded pipe is cut to specified lengths using automatic plasma or oxygen cutting systems.
Non-Destructive Testing (NDT):
100% Ultrasonic Testing (UT): Automatic UT system inspects the entire spiral weld seam and full pipe body for laminations, inclusions, lack of fusion, and other discontinuities.
Radiographic Testing (RT): X-ray or gamma-ray inspection of weld seam (spot or full length as specified).
Magnetic Particle Inspection (MPI): Inspection of weld toes and heat-affected zone for surface cracks and discontinuities.
Hydrostatic Testing: Required for API 5L compliance. Each pipe is hydrostatically tested to specified pressure (typically 85-100% of specified minimum yield strength).
End Finishing: Plain ends (square cut) or beveled ends (30°-35° bevel angle) as per customer specification.
Final Inspection & Marking: Visual inspection for surface defects, dimensional verification (OD, WT, length, straightness, roundness), and permanent marking per API 5L (including grade, size, heat number, manufacturer identification, PSL designation).
Advantages of SSAW Process for High-Strength Line Pipe:
1. Ability to produce very large diameters (up to 3,500mm+) from standard width coils
2. Continuous production process for high efficiency
3. Cost-effective for large diameter pipeline applications
4. Good dimensional stability and roundness
5. Specialized welding procedures for high-strength materials
7. Quality Control & Testing Procedures for API 5L X65 SSAW Steel Pipe
| Stage | Inspection Method | Purpose |
| Raw Material (Coil) | Chemical Analysis (OES Spectrometer) | Verify compliance with API 5L X65 composition limits |
| Raw Material (Coil) | Tensile Testing | Verify yield strength (min 450 MPa), tensile strength (min 535 MPa) |
| Raw Material (Coil) | Ultrasonic Testing | Detect internal laminations and defects |
| In-Process | Dimensional Inspection (Micrometers) | Monitor OD, WT during spiral forming |
| In-Process | Edge Preparation Inspection | Verify edge condition and alignment |
| Weld Zone | Ultrasonic Testing (UT) - On-Line | Detect weld discontinuities, lack of fusion |
| Weld Zone | Radiographic Testing (RT) | Verify weld penetration, porosity, slag inclusion |
| Weld Zone | Magnetic Particle Inspection (MPI) | Surface crack detection (weld and HAZ) |
| Finished Pipe | Dimensional Inspection | Verify OD, WT, length, straightness, roundness |
| Finished Pipe | Hydrostatic Testing (Mandatory for API 5L) | Verify pressure integrity per API 5L requirements |
| Finished Pipe | Guided Bend Test | Verify weld ductility and soundness |
| Finished Pipe | Flattening Test | Verify ductility and soundness of pipe body |
| Finished Pipe | Charpy V-Notch Impact Test (PSL2) | Verify low-temperature toughness (27J @ 0°C) |
| Finished Pipe | Hardness Test (PSL2) | Verify maximum hardness for sour service (max 200 HV) |
| Finished Pipe | Visual & Surface Inspection | Check for surface defects, laminations, cracks |
| Finished Pipe | Marking Verification | Ensure permanent marking per API 5L |
Optional Tests for Critical Pipeline Applications:
1. HIC (Hydrogen Induced Cracking) Test per NACE TM0284 for sour service
2. SSC (Sulfide Stress Cracking) Test per NACE TM0177
3. Low-temperature Impact Testing at -20°C, -40°C, or -60°C
4. DWTT (Drop Weight Tear Test) for fracture toughness
5. CVN (Charpy V-Notch) testing at specified temperatures
6. CTOD (Crack Tip Opening Displacement) Test for fracture toughness
Quality Documentation:
1. Mill Test Certificate per EN 10204 Type 3.1 (or 3.2 upon request)
2. Hydrostatic Test Report
3. Ultrasonic Test Report (weld and body)
4. Radiographic Test Report (if specified)
5. Dimensional Inspection Report
6. Traceability from heat number to finished pipe
7. API 5L compliance certificate
8. Primary Applications - API 5L X65 SSAW Steel Pipe
API 5L X65 SSAW high-strength steel pipes are essential components in high-pressure oil and gas transmission, sour service, and offshore pipeline projects:
High-Pressure Oil & Gas Transmission: Long-distance transmission pipelines for crude oil, natural gas, and refined products operating at high pressures. X65's high strength allows for thinner walls, reduced weight, and lower project costs.
Sour Service Pipelines: Pipelines transporting sour gas or oil containing hydrogen sulfide (H₂S). PSL2 grade with hardness control and HIC/SSC testing ensures resistance to sulfide stress cracking.
Offshore Pipelines: Subsea pipelines for oil and gas transportation from offshore platforms to onshore facilities. X65 offers excellent weldability and toughness for offshore installation.
Gas Gathering Systems: High-pressure gas gathering lines collecting natural gas from wellheads to processing facilities.
High-Pressure Water Injection Lines: Pipelines injecting water into oil reservoirs for enhanced oil recovery, requiring high pressure ratings.
Subsea Flowlines: Subsea flowlines connecting wells to manifolds and platforms in deepwater developments.
CO₂ Pipelines: Pipelines transporting carbon dioxide for enhanced oil recovery or carbon capture and storage applications.
Structural Piling: Load-bearing piles for offshore platforms, bridges, and marine structures requiring high-strength steel.
9. Packaging & Shipping - API 5L X65 SSAW Steel Pipe
API 5L X65 SSAW high-strength steel pipes are packaged and shipped with utmost care to ensure their protection during transit.
Packaging:
Protective Coating: Before packaging, pipes may be coated with anti-rust oil, FBE, 3LPE, or left bare as required. For offshore and sour service applications, specialized coating systems are recommended.
Bundling (Small Diameters): For smaller diameter pipes (typically below 610mm / 24"), pipes are bundled together in hexagonal or rectangular bundles secured with steel straps (typically 3-5 straps per bundle with protective corner guards).
Individual Stacking (Large Diameters): For larger diameter pipes (above 610mm / 24"), pipes are handled and shipped individually with wooden dunnage or rubber padding between layers.
End Caps: Plastic or steel end caps protect beveled ends and plain ends from impact damage, debris ingress, and moisture.
Padding and Cushioning: For premium export orders, padding materials such as foam rings, rubber strips, or wood dunnage are used between pipe layers.
Shipping:
Mode of Transportation: Pipes are shipped via container vessels (20ft or 40ft containers for small diameters), bulk carriers (break bulk for large diameters and large volumes), or rail freight.
Containerization (Small Diameters): For smaller diameter pipes (typically below 508mm / 20"), pipes are loaded into standard 20ft or 40ft shipping containers.
Bulk Vessel Loading (Large Diameters & Large Volumes): For large-volume orders (typically >500 tons) or large diameter pipes (above 508mm / 20"), pipes are loaded directly into bulk carriers or geared vessels.
Flat Rack or Open Top Containers: For pipes exceeding standard container dimensions (length >12m or diameter >2.3m), flat rack containers or open top containers may be used.
Labeling and Documentation: Each bundle or individual pipe is clearly labeled with essential information including material grade, standard, dimensions, heat number, bundle/pipe number, and handling instructions.
Customs Compliance: All necessary customs documentation—commercial invoice, packing list, bill of lading, Certificate of Origin, Mill Test Certificates—is prepared.
Secure Fastening: Bundles and individual pipes are securely fastened using steel strapping (with corner protectors), dunnage bags, timber bracing, or chain lashing to prevent movement during transit.
Tracking and Monitoring: Advanced logistics tracking systems provide real-time location updates.
Insurance: Marine cargo insurance (All Risk or With Average coverage) may be arranged.
In summary, Womic Steel ensures that all API 5L X65 SSAW high-strength steel pipes are packaged with industry-leading protective measures and shipped using reliable transportation methods.
10. Womic Steel Advantages & FAQ - API 5L X65 SSAW Steel Pipe
Why Partner with Womic Steel for API 5L X65 SSAW Steel Pipe?
Complete Range of Sizes: SSAW process covering 219mm to 3,500mm OD, wall thickness up to 25.4mm, lengths up to 60m for high-pressure pipeline projects.
API 5L Monogram License: Full compliance with API 5L PSL1 and PSL2 requirements. Regular API audits ensure ongoing quality compliance.
PSL2 & Sour Service Capability: Supply of PSL2 grade with guaranteed impact toughness, maximum hardness limits (max 200 HV), and HIC/SSC testing for sour service applications.
High-Strength Expertise: Deep understanding of API 5L X65 material properties, welding requirements, and fabrication considerations for high-strength pipelines.
Value-Added Services: End beveling, plain end cutting, protective coating (FBE, 3LPE, Coal Tar Epoxy), and anti-corrosion wrapping.
Long Length Capability: Up to 60m single length for pipeline projects, reducing field welding requirements.
Competitive Logistics: Strategic partnership with global freight forwarders ensures cost-effective worldwide shipping.
Comprehensive Documentation: Full Mill Test Certificates (EN 10204 Type 3.1 or 3.2), hydrostatic test reports, NDT reports, dimensional reports, and traceability documentation.
Choose Womic Steel Group as your reliable partner for high-quality API 5L X65 SSAW high-strength steel pipes for high-pressure pipeline, sour service, and offshore projects worldwide. Welcome to inquire!
Website: www.womicsteel.com
Email: sales@womicsteel.com
Tel/WhatsApp/WeChat:
Victor: +86-15575100681
Jack: +86-18390957568
Frequently Asked Questions (FAQ) - API 5L X65 SSAW Steel Pipe
Q: What is the difference between API 5L X65 PSL1 and PSL2?
A: PSL2 has stricter chemical composition limits (lower C, P, S), mandatory impact toughness requirements (27J @ 0°C), maximum hardness limits (max 200 HV for sour service), and more rigorous non-destructive testing. PSL1 is suitable for standard pipeline applications without low-temperature or sour service requirements. PSL2 is recommended for offshore, sour service, and low-temperature applications.
Q: What is the difference between X65 and X52?
A: X65 has a minimum yield strength of 450 MPa, while X52 has 360 MPa. X65 provides approximately 25% higher strength, allowing for thinner walls, reduced weight, and higher operating pressures. X65 also has stricter chemical composition limits for better toughness and sour service capability.
Q: Is API 5L X65 suitable for sour service?
A: Yes, API 5L X65 PSL2 with additional HIC (Hydrogen Induced Cracking) and SSC (Sulfide Stress Cracking) testing is suitable for sour service applications. Hardness is controlled to maximum 200 HV, and specific chemical composition limits apply. Please specify sour service requirements at quotation stage.
Q: What is the maximum diameter SSAW pipe you can produce in X65?
A: We can produce X65 SSAW pipe up to 3,500mm (138 inches) outside diameter. For diameters up to 4,000mm (160 inches), please contact us for special project capability assessment.
Q: What coating options are available for X65 line pipe?
A: We offer FBE (Fusion Bonded Epoxy), 3LPE (Three Layer Polyethylene), 3LPP (Three Layer Polypropylene), Coal Tar Epoxy, and Liquid Epoxy. For offshore and sour service applications, 3LPE or FBE coating is recommended.
Q: Can you supply X65 pipe with third-party inspection (SGS, BV, TÜV, DNV)?
A: Yes. We facilitate inspections by SGS, BV, TÜV, DNV, ABS, LR, or any client-nominated representative during production and prior to shipment. 3.2 inspection certificates are routinely supplied upon request.
Q: What non-destructive testing (NDT) is provided for X65 SSAW pipe?
A: Standard NDT includes 100% Ultrasonic Testing (UT) of weld seam and pipe body, Radiographic Testing (RT) spot inspection, and mandatory hydrostatic testing per API 5L. For PSL2 and sour service, additional UT and MPI are performed.
Q: What is the typical lead time for API 5L X65 SSAW steel pipe?
A: Standard lead times are approximately 45-60 days for SSAW production, depending on order quantity, diameter, wall thickness, and PSL requirements. Rush orders (30-45 days) may be available for smaller quantities.
Q: What documentation is provided with each shipment?
A: Mill Test Certificate (EN 10204 Type 3.1 or 3.2), Hydrostatic Test Report, Dimensional Inspection Report, UT Reports, RT Reports (if specified), Traceability Documentation, Packing List, Commercial Invoice, and Certificate of Origin. For PSL2, impact test reports and hardness test reports are included.
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