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 steel pipes, serving infrastructure, bridge, and heavy industrial projects worldwide.
Production Size Range for SSAW High-Strength Steel Pipe: Outside diameter from 219mm to 3,000mm (8 inch to 120 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 bridge and structural projects.
Quality Certifications & Regulatory Compliance:
ISO 9001:2015 Certified: Quality Management System for high-strength 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, demonstrating our commitment to high-quality manufacturing standards.
CE Marking (PED 2014/68/EU): CE marking is available upon request to facilitate smooth customs clearance and project acceptance within the European Economic Area (EEA).
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
Global Recognition: Womic Steel is a trusted supplier to global EPC contractors, bridge builders, and infrastructure developers, serving over 80 countries across Southeast Asia, Europe, the Middle East, Africa, and the Americas.
2. ASTM A572 GR.50: Material Composition & Performance Characteristics
ASTM A572 GR.50 is the American standard specification for high-strength low-alloy (HSLA) columbium-vanadium structural steel. The "GR.50" designation indicates Grade 50, which offers a minimum yield strength of 345 MPa (50,000 psi) and minimum tensile strength of 450 MPa (65,000 psi). Grade 50 is the most commonly used grade in the A572 specification, offering an excellent balance of high strength, weldability, and formability.
ASTM A572 GR.50 is specifically formulated for structural applications requiring higher strength than conventional carbon steels. Compared to A36 (yield strength 250 MPa), A572 GR.50 provides approximately 38% higher yield strength, allowing for lighter structures, reduced section sizes, and lower overall project costs. The HSLA composition provides improved atmospheric corrosion resistance and better low-temperature toughness compared to plain carbon steels.
Chemical Composition (Ladle Analysis, % by mass):
| Element | ASTM A572 GR.50 (Max %) |
| C | 0.23 |
| Mn | 1.35 |
| P | 0.040 |
| S | 0.050 |
| Si | 0.40 |
| V | 0.01-0.15 |
| Nb | 0.005-0.05 |
Note: The addition of columbium (niobium) and vanadium provides grain refinement and precipitation strengthening, achieving higher strength without significantly increasing carbon content, thus maintaining good weldability.
Mechanical Properties (Room Temperature):
| Property | ASTM A572 GR.50 |
| Yield Strength (min) | 345 MPa (50,000 psi) |
| Tensile Strength (min) | 450 MPa (65,000 psi) |
| Elongation (min) | 18% (for 50mm gauge) |
| Impact Toughness | Not specified (optional) |
Note: ASTM A572 GR.50 offers approximately 38% higher yield strength than A36 (250 MPa), allowing for significant weight reduction in structural applications.
Comparison of ASTM A572 High-Strength Low-Alloy Grades:
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Typical Application |
| GR.42 | 290 | 415 | Light to medium structural applications |
| GR.50 | 345 | 450 | Bridges, buildings, transmission towers |
| GR.60 | 415 | 520 | Heavy structural, high-load applications |
| GR.65 | 450 | 550 | Heavy industrial, offshore structures |
Note: For the most demanding structural applications requiring the highest strength, ASTM A572 GR.60 or GR.65 should be considered.
3. Dimensional Range & Standards Compliance
Womic Steel supplies ASTM A572 GR.50 SSAW high-strength steel pipes across a wide dimensional spectrum, fully compliant with ASTM A572 and related international standards. The SSAW (Spiral Submerged Arc Welded) process is ideal for large diameter structural applications.
| Item | Specification |
| Standard | ASTM A572 (GR.42, GR.50, GR.60, GR.65) |
| Manufacturing Process | SSAW (Spiral Submerged Arc Welded) - 219mm-3,000mm OD |
| Outside Diameter Range | 219mm – 3,000mm (8" – 120") |
| 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 / Primed / Galvanized |
| Tolerances | OD: ±0.5% / WT: ±10% / Length: +50mm -0mm |
4. Available Dimensions & Specifications - ASTM A572 GR.50 SSAW Steel Pipe
SSAW High-Strength Steel Pipe (219mm – 3,000mm 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 |
Note: Custom dimensions outside these ranges available upon request.
5. Common High-Strength Structural Steel Standards Manufactured by Womic Steel
| Standard | Steel Grades | Typical Application |
| ASTM High-Strength Standards | ||
| ASTM A572 | GR.42, GR.50, GR.60, GR.65 | High-strength low-alloy structural steel |
| ASTM A588 | GR.A, GR.B, GR.C | Weathering steel, atmospheric corrosion resistance |
| ASTM A913 | GR.50, GR.60, GR.65, GR.70 | High-strength steel with improved weldability |
| ASTM A992 | GR.50 | Wide-flange beams and structural shapes |
| ASTM Structural Standards | ||
| ASTM A500 | GR.A, GR.B, GR.C | Cold-formed welded structural tubing |
| ASTM A252 | GR.1, GR.2, GR.3 | Steel pipe piles for deep foundation |
| EN Structural Standards | ||
| EN 10025 | S355JR, S355J2, S420ML, S460ML | Hot-rolled structural steel |
| EN 10219 | S355JRH, S355J2H | Cold-formed welded structural hollow sections |
| Other Standards | ||
| CSA G40.21 | 44W, 50W, 50A | Canadian standard structural steel |
| AS/NZS 3678 | 350L15, 400L15 | Australian standard structural steel |
Usage: Bridge girders and trusses, building frames and columns, transmission towers, offshore structures, industrial facilities, heavy equipment supports, piling applications, stadiums and exhibition halls, crane runways, heavy machinery supports
6. Manufacturing Process - SSAW (Spiral Submerged Arc Welded) High-Strength Steel Pipe
SSAW Manufacturing Process for High-Strength Steel Pipe (219mm – 3,000mm OD):
Raw Material Inspection (Coil): Incoming hot-rolled steel coils are verified for chemical composition, mechanical properties, and surface quality against ASTM A572 GR.50 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 high-strength steel, specialized welding consumables are used to match the base metal properties.
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 (Optional): Available upon customer request.
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 ASTM A572 (including grade, size, heat number, manufacturer identification).
Advantages of SSAW Process for High-Strength Steel Pipe:
1. Ability to produce very large diameters (up to 3,000mm+) from standard width coils
2. Continuous production process for high efficiency
3. Cost-effective for large diameter structural applications
4. Good dimensional stability and roundness
5. Specialized welding procedures for high-strength materials
7. Quality Control & Testing Procedures for ASTM A572 GR.50 SSAW Steel Pipe
| Stage | Inspection Method | Purpose |
| Raw Material (Coil) | Chemical Analysis (OES Spectrometer) | Verify compliance with ASTM A572 GR.50 composition limits |
| Raw Material (Coil) | Tensile Testing | Verify yield strength (min 345 MPa), tensile strength (min 450 MPa), elongation (min 18%) |
| 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 |
| 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 for bridge and offshore applications |
| Finished Pipe | Visual & Surface Inspection | Check for surface defects, laminations, cracks |
| Finished Pipe | Marking Verification | Ensure permanent marking per ASTM A572 |
Optional Tests for Critical Structural Applications:
1. CTOD (Crack Tip Opening Displacement) Test for fracture toughness
2. Low-temperature Impact Testing at -20°C, -40°C, or -60°C
3. Hardness Testing (HV10 or HRC)
4. Weldability testing for field joining verification
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 - ASTM A572 GR.50 SSAW Steel Pipe
ASTM A572 GR.50 SSAW high-strength steel pipes are essential components in bridge construction, building structures, and heavy industrial projects:
Bridge Construction: Bridge girders, trusses, arches, and structural supports for highway and railway bridges. The high strength of GR.50 allows for longer spans and lighter structures.
Building Frames: Columns, beams, bracing members, and trusses for high-rise buildings, commercial buildings, and industrial facilities.
Transmission Towers: Support structures for electrical transmission towers, communication towers, and wind turbine towers.
Offshore Structures: Structural components for offshore platforms, jacket structures, and marine foundations requiring high-strength steel.
Heavy Industrial Facilities: Structural supports for factories, power plants, refineries, and processing facilities handling heavy loads.
Crane Runways: Support structures for heavy-duty overhead cranes and gantry cranes in industrial facilities.
Stadiums & Exhibition Halls: Large-span structural members for stadium roofs, exhibition halls, and convention centers.
Heavy Equipment Supports: Structural supports for heavy machinery, equipment platforms, and industrial racks.
Piling Applications: Load-bearing piles for bridge foundations, building foundations, and industrial facilities requiring high-strength piling.
9. Packaging & Shipping - ASTM A572 GR.50 SSAW Steel Pipe
ASTM A572 GR.50 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, primer, or left bare as required. For bridge and marine applications, additional coating protection is 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 ASTM A572 GR.50 SSAW high-strength steel pipes are packaged with industry-leading protective measures and shipped using reliable transportation methods.
10. Womic Steel Advantages & FAQ - ASTM A572 GR.50 SSAW Steel Pipe
Why Partner with Womic Steel for ASTM A572 GR.50 SSAW Steel Pipe?
Complete Range of Sizes: SSAW process covering 219mm to 3,000mm OD, wall thickness up to 25.4mm, lengths up to 60m for bridge and structural projects.
High-Strength Focus: Specialized experience in high-strength low-alloy steel pipe applications for bridges, buildings, and heavy industrial facilities.
HSLA Expertise: Deep understanding of ASTM A572 GR.50 material properties, welding requirements, and fabrication considerations for high-strength steel.
Value-Added Services: End beveling, plain end cutting, protective coating (primer, galvanizing, FBE, 3LPE), and anti-corrosion wrapping.
Long Length Capability: Up to 60m single length for bridge girders and long-span structural applications, reducing field splicing requirements.
Competitive Logistics: Strategic partnership with global freight forwarders and project cargo specialists ensures optimized loading and 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 provided for every shipment.
Choose Womic Steel Group as your reliable partner for high-quality ASTM A572 GR.50 SSAW high-strength steel pipes for bridge, building, and heavy industrial 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) - ASTM A572 GR.50 SSAW Steel Pipe
Q: What is the difference between ASTM A572 GR.50 and A36 steel?
A: ASTM A572 GR.50 has a minimum yield strength of 345 MPa (50,000 psi), while A36 has 250 MPa (36,000 psi). GR.50 provides approximately 38% higher yield strength, allowing for lighter structures and reduced section sizes. GR.50 also has improved atmospheric corrosion resistance due to its HSLA composition.
Q: Can ASTM A572 GR.50 be welded using standard procedures?
A: Yes, ASTM A572 GR.50 has excellent weldability. However, due to its higher strength and alloy content (columbium and vanadium), low-hydrogen welding procedures are recommended. Preheating may be required for thicker sections. Womic Steel can provide welding procedure recommendations upon request.
Q: What is the difference between ASTM A572 GR.50 and ASTM A992?
A: ASTM A572 GR.50 is a general specification for HSLA steel plates, shapes, and bars. ASTM A992 is specifically for wide-flange beams and structural shapes for building framing. Both have similar yield strength (345-450 MPa), but A992 has tighter controls on material properties for seismic applications.
Q: What is the maximum single length for ASTM A572 GR.50 SSAW steel pipe?
A: Standard lengths are 6m, 12m, and 18m. Custom lengths up to 60m are available depending on diameter and wall thickness. Extra-long lengths are ideal for bridge girders and long-span structural applications.
Q: What surface finish options are available for bridge applications?
A: For bridge applications, we offer primer coating, hot dip galvanizing, or specialized anti-corrosion systems (FBE, 3LPE, or epoxy coatings). Weathering steel (ASTM A588) is also available for bridge applications requiring atmospheric corrosion resistance without painting.
Q: Can you supply ASTM A572 GR.50 pipe with third-party inspection?
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 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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