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 pipes, serving high-pressure oil and gas pipeline projects worldwide.
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 and deep foundation 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 X52 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 to facilitate smooth customs clearance and project acceptance within the European Economic Area (EEA). Declaration of Performance (DoP) provided for EN standard products.
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) for critical pipeline projects requiring full material traceability and independent verification.
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 X52: Material Composition & Performance Characteristics
API 5L X52 is a medium-strength grade in the API 5L line pipe specification, offering a minimum yield strength of 360 MPa (52,200 psi) and minimum tensile strength of 460 MPa (66,700 psi). The "X" designation indicates high-strength line pipe, and "52" represents the minimum yield strength in ksi (thousand pounds per square inch). X52 is widely used for medium to high-pressure oil and gas transmission pipelines, particularly in onshore and offshore projects requiring higher strength than GR.B but without the cost of X65 or X70.
API 5L X52 offers excellent weldability for field joining, good low-temperature toughness for challenging environments, and sufficient ductility for bending and forming. Compared to GR.B, X52 provides approximately 47% higher yield strength, allowing for thinner walls, reduced weight, and lower overall project costs for high-pressure applications.
Chemical Composition (Ladle Analysis, % by mass):
| Element | API 5L X52 (Max %) |
| C | 0.24 |
| Mn | 1.40 |
| P | 0.025 |
| S | 0.015 |
| Si | 0.45 |
| V | 0.10 |
| Nb | 0.05 |
| Ti | 0.04 |
Note: API 5L X52 has more stringent limits on phosphorus and sulfur compared to GR.B, resulting in better toughness and weldability. The carbon equivalent (CEV) is typically controlled below 0.43% for PSL2 grades.
Mechanical Properties (Room Temperature):
| Property | API 5L X52 |
| Yield Strength (min) | 360 MPa (52,200 psi) |
| Tensile Strength (min) | 460 MPa (66,700 psi) |
| Elongation (min) | 21% (for 50mm gauge) |
| Hardness (max) | 90 HRB / 200 HV (PSL2) |
| Impact Toughness (PSL2) | 27 Joules @ 0°C (typical) |
*Note: API 5L X52 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 Line Pipe Grades:
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Typical Application |
| GR.B | 245 | 415 | Standard pressure pipelines, water |
| X42 | 290 | 415 | Medium pressure pipelines |
| X52 | 360 | 460 | Higher pressure pipelines, onshore/offshore |
| X65 | 450 | 535 | High pressure, sour service |
| X70 | 485 | 570 | Very high pressure pipelines |
*Note: For most medium to high-pressure pipeline projects, API 5L X52 offers an excellent balance of strength, weldability, and cost.*
3. Dimensional Range & Standards Compliance
Womic Steel supplies API 5L X52 SSAW steel pipes across a wide dimensional spectrum, fully compliant with API 5L and related international standards. The SSAW (Spiral Submerged Arc Welded) process is ideal for large diameter pipeline applications.
| Item | Specification |
| Standard | API 5L PSL1 / PSL2 (GR.B, X42, X52, 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 X52 SSAW Steel Pipe
SSAW 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. Larger diameters (up to 4,000mm / 160") available for specialized projects.
5. Common Line Pipe & Structural Steel Standards Manufactured by Womic Steel
| Standard | Steel Grades | Typical Application |
| API Line Pipe Standards | ||
| API 5L PSL1 | GR.B, X42, X52, X65, X70 | Standard quality line pipe for oil/gas/water |
| API 5L PSL2 | GR.B, X42, X52, X65, X70 | Higher quality with impact and hardness requirements |
| ASTM Piling Standards | ||
| ASTM A252 | GR.1, GR.2, GR.3 | Steel pipe piles for deep foundation |
| ASTM A500 | GR.A, GR.B, GR.C | Structural round tubes for piling |
| EN Piling Standards | ||
| EN 10248 | S235GP, S275GP, S355GP | Hot-rolled steel sheet piling and pipe piling |
| EN 10219 | S235JRH, S275JRH, S355JRH, S355J2H | Cold-formed welded structural hollow sections |
| EN 10025 | S235JR, S275JR, S355JR, S355J2 | Hot-rolled structural steel for piling |
| Other Standards | ||
| ISO 3183 | L245, L290, L360, L415, L450, L485 | ISO equivalent of API 5L |
| JIS G3444 | STK290, STK400, STK490, STK540 | Carbon steel tubes for structural piling |
Usage: Oil and gas transmission pipelines, high-pressure water supply lines, slurry transport, offshore pipelines, deep foundation piling, marine piling, structural supports, cross-country pipelines
6. Manufacturing Process - SSAW (Spiral Submerged Arc Welded) Steel Pipe
SSAW Manufacturing Process for 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 X52 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. The helix angle is adjustable to achieve different diameters from the same coil width.
Inner Submerged Arc Welding (SAW): The inner spiral seam is welded first using automatic submerged arc welding equipment with appropriate flux and wire combination. The welding head is positioned inside the pipe to ensure proper penetration.
Outer Submerged Arc Welding (SAW): The outer spiral seam is welded immediately after the inner weld, using automatic submerged arc welding equipment. The outer weld completes the full penetration weld and provides additional strength.
Cutting to Length: The continuous spiral welded pipe is cut to specified lengths using automatic plasma or oxygen cutting systems with precision length control (+50mm -0mm for pipeline specifications).
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) to verify weld quality and penetration.
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 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
7. Quality Control & Testing Procedures for API 5L X52 SSAW Steel Pipe
| Stage | Inspection Method | Purpose |
| Raw Material (Coil) | Chemical Analysis (OES Spectrometer) | Verify compliance with API 5L X52 composition limits |
| Raw Material (Coil) | Tensile Testing | Verify yield strength, tensile strength, elongation |
| 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 |
| 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
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 X52 SSAW Steel Pipe
API 5L X52 SSAW steel pipes are essential components in oil and gas transmission, water supply, and structural applications:
Oil & Gas Transmission Pipelines: Long-distance transmission pipelines for crude oil, natural gas, and refined products. X52's higher strength allows for higher operating pressures and reduced wall thickness compared to GR.B.
High-Pressure Water Supply: Large diameter water transmission mains for municipal water supply, industrial water systems, and irrigation projects requiring higher pressure ratings.
Offshore Pipelines: Subsea pipelines for oil and gas transportation from offshore platforms to onshore facilities. X52 offers good weldability and toughness for offshore installation.
Slurry Transport: Transport of mineral slurries, tailings, and dredged materials in mining and dredging operations where higher strength is required.
Structural Piling: Load-bearing piles for bridges, buildings, and industrial facilities requiring higher strength than standard piling grades.
Marine & Offshore Platform Foundation: Foundation piles for offshore platforms and wind turbines where higher strength reduces pile weight and drives deeper.
Cross-Country Pipelines: Onshore pipelines traversing challenging terrain where pipe strength is critical for safety and reliability.
Compressor Station Piping: Station piping at compressor and pumping stations requiring higher pressure ratings.
9. Packaging & Shipping - API 5L X52 SSAW Steel Pipe
API 5L X52 SSAW steel pipes are packaged and shipped with utmost care to ensure their protection during transit. Here is a description of the packaging and shipping process for large-diameter SSAW pipes:
Packaging:
Protective Coating: Before packaging, pipes may be coated with a thin layer of anti-rust oil or protective varnish to prevent surface corrosion and oxidation during storage and transit. Bare finish also available for immediate coating application at destination.
Bundling (Small Diameters): For smaller diameter pipes (typically below 610mm / 24"), pipes are bundled together in hexagonal or rectangular bundles. They are secured using 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 typically handled and shipped individually. Wooden dunnage or rubber padding placed between pipe layers prevents abrasion and coating damage.
End Caps: Plastic or steel end caps are placed on both ends of each pipe to protect beveled ends, 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 to prevent abrasion and coating damage.
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, dunnage bags, timber bracing, or chain lashing.
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 X52 SSAW steel pipes are packaged with industry-leading protective measures and shipped using reliable transportation methods.
10. Womic Steel Advantages & FAQ - API 5L X52 SSAW Steel Pipe
Why Partner with Womic Steel for API 5L X52 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 pipeline and piling projects.
API 5L Monogram License: Full compliance with API 5L PSL1 and PSL2 requirements. Regular API audits ensure ongoing quality compliance.
PSL2 Capability: Supply of PSL2 grade with guaranteed impact toughness and stricter chemical composition limits for sour service and low-temperature applications.
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 X52 SSAW steel pipes for pipeline, marine, and deep foundation 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 X52 SSAW Steel Pipe
Q: What is the difference between API 5L X52 PSL1 and PSL2?
A: PSL2 has stricter chemical composition limits (lower C, P, S), mandatory impact toughness requirements (27J @ 0°C), maximum hardness limits (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 X52 and GR.B?
A: X52 has a minimum yield strength of 360 MPa, while GR.B has 245 MPa. X52 provides approximately 47% higher strength, allowing for thinner walls, reduced weight, and higher operating pressures. X52 also has stricter chemical composition limits for better toughness and weldability.
Q: What is the maximum diameter SSAW pipe you can produce in X52?
A: We can produce X52 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 X52 line pipe?
A: We offer FBE (Fusion Bonded Epoxy), 3LPE (Three Layer Polyethylene), 3LPP (Three Layer Polypropylene), Coal Tar Epoxy, and Liquid Epoxy. For most pipeline applications, 3LPE or FBE coating is recommended.
Q: Can you supply X52 pipe with third-party inspection (SGS, BV, TÜV)?
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 X52 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. MPI and additional UT are available upon request.
Q: What is the typical lead time for API 5L X52 SSAW steel pipe?
A: Standard lead times are approximately 30-45 days for SSAW production, depending on order quantity, diameter, wall thickness, and PSL requirements. Rush orders (20-30 days) may be available for smaller quantities.
Q: What documentation is provided with each shipment?
A: Mill Test Certificate (EN 10204 Type 3.1), Hydrostatic Test Report, Dimensional Inspection Report, UT Reports, RT Reports (if specified), Traceability Documentation, Packing List, Commercial Invoice, and Certificate of Origin.
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