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 oil & gas, water transmission, and marine foundation 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 deep foundation and 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. The API Monogram represents our commitment to the highest industry standards for oil & 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 and marine 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 (Environmental Management System)
ISO 45001:2018 (Occupational Health & Safety Management System)
FPC (Factory Production Control) per EN 10219
Global Recognition: Womic Steel is a trusted supplier to global EPC contractors, pipeline companies, port authorities, and foundation contractors, serving over 80 countries across Southeast Asia, Europe, the Middle East, Africa, and the Americas.
2. API 5L GR.B: Material Composition & Performance Characteristics
API 5L GR.B is the most widely used American standard specification for line pipe used in oil and gas transmission, water supply, and slurry transport systems. The "GR.B" designation indicates Grade B, which offers a minimum yield strength of 245 MPa (35,500 psi) and minimum tensile strength of 415 MPa (60,200 psi). Grade B is the preferred choice for standard pressure pipelines, water transmission lines, and structural applications where moderate strength and excellent weldability are required.
API 5L GR.B offers excellent weldability for field joining, good ductility for bending and forming, and sufficient toughness for moderate temperature applications. Compared to higher grades like X52 or X65, GR.B provides a cost-effective solution for projects that do not require high-strength steel.
Chemical Composition (Ladle Analysis, % by mass):
| Element | API 5L GR.B (Max %) |
| C | 0.26 |
| Mn | 1.20 |
| P | 0.030 |
| S | 0.030 |
| Si | --- |
| V | 0.08 |
| Nb | 0.05 |
| Ti | 0.04 |
Note: The carbon equivalent (CEV) is typically controlled below 0.40% to ensure excellent field weldability for pipeline construction.
Mechanical Properties (Room Temperature):
| Property | API 5L GR.B |
| Yield Strength (min) | 245 MPa (35,500 psi) |
| Tensile Strength (min) | 415 MPa (60,200 psi) |
| Elongation (min) | 21% (for 50mm gauge) |
| Hardness (max) | 85 HRB / 185 HV |
Note: API 5L GR.B offers reliable mechanical properties for standard pressure pipelines. For higher strength requirements, API 5L X42, X52, X65, or X70 should be considered.
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 |
| X65 | 450 | 535 | High pressure, sour service |
| X70 | 485 | 570 | Very high pressure pipelines |
*Note: For most standard pipeline and water transmission projects, API 5L GR.B is the most cost-effective and widely available grade.*
3. Dimensional Range & Standards Compliance
Womic Steel supplies SSAW steel pipes across a wide dimensional spectrum, fully compliant with API 5L, ASTM, EN, and other international standards. The SSAW (Spiral Submerged Arc Welded) process is ideal for large diameter, thin to medium wall thickness applications.
| Item | Specification |
| Standard | API 5L GR.B, X42, X52, X65, X70 / ASTM A252 / EN 10248 / EN 10219 |
| Manufacturing Process | SSAW (Spiral Submerged Arc Welded) - 219mm-3500mm 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) or ±10% (EN) / Length: +50mm -0mm |
4. Available Dimensions & Specifications - 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 SSAW Steel Pipe Standards Manufactured by Womic Steel
| Standard | Steel Grades | Typical Application |
| API Line Pipe Standards | ||
| API 5L | GR.B, X42, X52, X65, X70 | Oil & gas transmission, water, slurry |
| ASTM Piling Standards | ||
| ASTM A252 | GR.1, GR.2, GR.3 | Steel pipe piles for deep foundation, marine piling |
| ASTM A500 | GR.A, GR.B, GR.C | Structural round tubes for piling and bracing |
| ASTM A572 | GR.42, GR.50, GR.60, GR.65 | High-strength low-alloy structural 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 for piling |
| EN 10025 | S235JR, S275JR, S355JR, S355J2 | Hot-rolled structural steel for piling |
| JIS Piling Standards | ||
| JIS A5525 | SKK400, SKK490, SKK540 | Steel pipe piles for harbor and marine structures |
| JIS G3444 | STK290, STK400, STK490, STK540 | Carbon steel tubes for structural piling |
| Other Standards | ||
| AS 1163 | C250, C350, C450 | Australian standard structural hollow sections |
| CSA G40.21 | 44W, 50W, 50A | Canadian standard structural steel for piling |
Usage: Deep foundation piling, marine piling, offshore platform foundation, wharf and dock construction, bridge foundation, coastal protection, breakwater, port and harbor construction, land reclamation, river training, tunnel engineering, oil and gas transmission, water supply pipelines, slurry transport, structural supports
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, ASTM, EN, or customer 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 (±5mm for standard lengths, +50mm -0mm for piling 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 (Optional): Available upon customer request for critical pipeline applications requiring pressure integrity verification.
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), and permanent marking per applicable standard (including grade, size, heat number, manufacturer identification).
Advantages of SSAW Process:
1.Ability to produce very large diameters (up to 3,500mm+) from standard width coils
2.Continuous production process for high efficiency
3.Adjustable helix angle for optimal strength characteristics
4.Cost-effective for large diameter, thin to medium wall applications
5.Good dimensional stability and roundness
7. Quality Control & Testing Procedures for SSAW Steel Pipe
| Stage | Inspection Method | Purpose |
| Raw Material (Coil) | Chemical Analysis (OES Spectrometer) | Verify compliance with API 5L / ASTM / EN 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 (Optional) | Verify pressure integrity for critical applications |
| 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 (Optional) | Verify low-temperature toughness |
| Finished Pipe | Hardness Test (Optional) | Verify maximum hardness for weldability |
| Finished Pipe | Visual & Surface Inspection | Check for surface defects, laminations, cracks |
| Finished Pipe | Marking Verification | Ensure permanent marking per standard |
Optional Tests for Critical Pipeline & Marine Applications:
1. HIC (Hydrogen Induced Cracking) Test per NACE TM0284
2. SSC (Sulfide Stress Cracking) Test per NACE TM0177
3. Low-temperature Impact Testing at -20°C, -40°C, or -60°C
4. Hardness Testing (HV10 or HRC) for sour service qualification
Quality Documentation:
1. Mill Test Certificate per EN 10204 Type 2.2, 3.1, or 3.2
2. Ultrasonic Test Report (weld and body)
3. Radiographic Test Report (if specified)
4. Dimensional Inspection Report
5. Traceability from heat number to finished pipe
8. Primary Applications - SSAW Steel Pipe
API 5L GR.B and other grade SSAW steel pipes are essential components in pipeline, deep foundation, marine construction, and heavy civil engineering projects:
Oil & Gas Transmission Pipelines: Long-distance transmission pipelines for crude oil, natural gas, and refined products. SSAW pipes are widely used for onshore and offshore pipeline projects due to their large diameter capability and cost-effectiveness.
Water Supply & Distribution: Large diameter water transmission mains, raw water supply lines, irrigation systems, and municipal water distribution networks.
Slurry Transport: Transport of mineral slurries, tailings, and dredged materials in mining and dredging operations.
Deep Foundation Piling: Load-bearing piles for high-rise buildings, bridges, industrial facilities, and heavy structures requiring deep foundation support.
Marine & Offshore Platform Foundation: Foundation piles for offshore oil and gas platforms, drilling rigs, and offshore wind turbine foundations.
Wharf, Dock & Port Construction: Piling for container terminals, bulk cargo ports, passenger terminals, and general cargo wharves.
Bridge Foundation & Pier: Deep foundation piles for bridge piers, abutments, and tower foundations.
Coastal Protection & Seawall: Piling for seawall structures, coastal revetments, shoreline protection, and erosion control.
Breakwater & Jetty Construction: Piling for rubble mound breakwater foundations, vertical wall breakwaters, jetties, and groynes.
Land Reclamation & Reclamation Seawall: Piling for reclamation area containment structures and perimeter seawalls.
River Training & Flood Control: Piling for riverbank protection, guide banks, spurs, and flood control structures.
Tunnel Engineering & Cut-and-Cover: Piling for cut-and-cover tunnel foundations, secant pile walls, and tunnel portal support structures.
9. Packaging & Shipping - SSAW Steel Pipe
API 5L GR.B and other grade 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.
Lifting Points: Lifting lugs or designated lifting points may be added to heavy pipes (over 2,000 kg per pipe) to facilitate safe unloading.
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.
Heavy Lift Planning: For extra-heavy pipes (over 5,000 kg per pipe), advance coordination with destination port for heavy lift handling equipment is recommended.
In summary, Womic Steel ensures that all API 5L GR.B and other grade SSAW steel pipes are packaged with industry-leading protective measures and shipped using reliable transportation methods.
10. Womic Steel Advantages & FAQ - SSAW Steel Pipe
Why Partner with Womic Steel for 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.
Multiple Standard Capability: Full compliance with API 5L (GR.B, X42, X52, X65, X70), ASTM A252, EN 10248, EN 10219, JIS A5525, and more. One supplier for multiple market requirements.
Pipeline & Marine Focus: Specialized experience in oil & gas pipelines, water transmission, and marine piling 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 deep foundation and pipeline projects, reducing field splicing requirements.
Competitive Logistics: Strategic partnership with global freight forwarders ensures cost-effective worldwide shipping.
Comprehensive Documentation: Full Mill Test Certificates (EN 10204 Type 2.2, 3.1, or 3.2), NDT reports, dimensional reports, and traceability documentation.
Choose Womic Steel Group as your reliable partner for high-quality API 5L GR.B and other grade 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) - SSAW Steel Pipe
Q: What is the difference between SSAW, LSAW, and ERW steel pipe?
A: SSAW (Spiral Submerged Arc Welded) uses a spiral welding process, ideal for large diameters (219mm-3500mm) and thin to medium walls. LSAW (Longitudinal Submerged Arc Welded) uses a straight seam weld, better for smaller diameters (508mm-3000mm) and thicker walls. ERW (Electric Resistance Welding) is used for smaller diameters (219mm-660mm) and thinner walls. SSAW is generally the most cost-effective for very large diameter applications.
Q: What is the maximum diameter SSAW pipe you can produce?
A: We can produce 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 is the maximum single length for SSAW pipe?
A: Standard lengths are 6m, 12m, and 18m. For deep foundation and pipeline projects, we supply custom lengths up to 60m (200 feet) depending on diameter and wall thickness.
Q: What coating options are available for SSAW steel pipe?
A: We offer FBE (Fusion Bonded Epoxy), 3LPE (Three Layer Polyethylene), 3LPP (Three Layer Polypropylene), Coal Tar Epoxy, Hot Dip Galvanizing, and Liquid Epoxy. For most pipeline applications, 3LPE or FBE coating is recommended.
Q: Can you supply SSAW 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 SSAW pipe?
A: Standard NDT includes 100% Ultrasonic Testing (UT) of weld seam and pipe body, plus Radiographic Testing (RT) spot inspection. MPI, Hydrostatic Testing, and additional UT are available upon request.
Q: What is the typical lead time for API 5L GR.B SSAW steel pipe?
A: Standard lead times are approximately 30-45 days for SSAW production, depending on order quantity, diameter, wall thickness, and testing 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), Dimensional Inspection Report, UT Reports, RT Reports (if specified), Traceability Documentation, Packing List, Commercial Invoice, and Certificate of Origin.
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