Product Overview
Black ERW Steel Pipe is manufactured through high-frequency electric resistance welding technology, using steel strips formed into tubes and welded under controlled production conditions. The ERW process provides consistent weld quality, accurate dimensions, and efficient production for large-volume steel pipe supply.
Specifications
|
Production Standards |
ASTM A53/ASTM A500/EN 10219/GB/T 3091/JIS G3444/Custom standards available upon request |
|
Outer Diameter Range |
Round tube: Φ21.3mm – Φ508mm Square tube: 20×20mm – 400×400mm Rectangular tube: 20×40mm – 300×500mm |
|
Wall Thickness Range |
0.75mm – 16mm |
|
Length |
5.8m / 6m / 12m or standard length |
|
Material |
Q195/ Q235B/Q345B/ ASTM A36/S235 / S355 |
|
Surface Treatment |
Anti-rust paint, protective oil, hot-dip galvanizing, powder coating, or bare surface |
|
Surface Condition |
Black raw tube |
|
Forming Method |
High-frequency resistance welding |
|
Supply Capacity |
Supports large-volume long-term orders OEM/Custom processing available |
Core Manufacturing Advantages
Advanced solid-state high-frequency welding creates a uniform weld seam with a tensile strength matching >95% of the parent metal, preventing seam cracking under heavy structural loads.
Automated laser-gauging systems control outer diameter and wall thickness tightly within international tolerances, ensuring seamless subsequent fabrication, bending, and threading.
Precision oil-coating (2-5μm) or temporary protective painting guards against oxidation during long-haul ocean freight, passing rigorous 72-hour salt spray testing.
Material Grades & Mechanical Properties
|
Steel Grade |
Standard |
Tensile Strength (Min) |
Yield Strength (Min) |
Elongation (Min) |
|
Q235B |
GB/T 3091 |
370 MPa |
235 MPa |
24% |
|
Q345B |
GB/T 3091 |
470 MPa |
345 MPa |
21% |
|
Grade B |
ASTM A53 |
415 MPa |
240 MPa |
21% |
|
S235JR |
EN 10219 |
360-510 MPa |
235 MPa |
24% |
|
S355JR |
EN 10219 |
510-680 MPa |
355 MPa |
20% |
Value-Added Customization Services
Precision Cutting: Custom cut-to-length services tailored to exact project specifications.
End Finishing: Threading with couplings, pipe beveling for welding, or mechanical grooving.
Hole Punching & Notching: Custom hole drilling or slotting for scaffolding, fencing, and greenhouses.
Special Coatings: Customized anti-rust paint colors, heavy-duty oiling, or specific film thickness.
Typical Applications
Construction & Structures: Scaffolding systems, steel piling, civil engineering, and heavy structural framing.
Fluid Transport: Low-pressure delivery systems for water, gas, and air.
Industrial & Mechanical: Machinery components, automotive structural parts, solar mounting systems, and greenhouse frames.
Quality Assurance & Testing Standards
100% NDT Testing: Every pipe undergoes online Eddy Current Testing (ET) or ultrasonic testing to eliminate internal and surface defects.
In-House Metallurgical Lab: Certified technicians perform routine destructive testing (flattening, expansion, tensile) with complete heat number traceability.
Third-Party Inspection (TPI): Fully cooperative with independent agencies like SGS, BV, TÜV, and Intertek for pre-shipment verification.
Full Documentation: EN 10204 3.1 Mill Test Certificates (MTC) detailing chemical and mechanical properties supplied with every shipment.
Standard Export Packaging & Logistics Protection
Secure Bundling: Tightened securely with high-strength steel strips into hexagonal or square bundles.
Moisture Protection: Wrapped entirely in heavy-duty waterproof woven fabric to prevent rain and moisture ingress during sea transport.
End Protection: Fitted with durable plastic end caps on both sides to protect pipe bevels and edges from impact damage.
Container Optimization: Expert loading by seasoned logistics personnel, utilizing wooden dunnage and desiccant bags for secure container shipping or bulk vessel break-bulk transport.
FAQ
Q: What is the typical minimum order quantity (MOQ) for custom-sized black ERW steel pipes?
A: We generally evaluate MOQ based on the specific dimensions, steel grades, and total tonnage required, and we can discuss flexible options for trial or project-based orders.
Q: Can you provide Mill Test Certificates (MTC) conforming to EN 10204 3.1 for each shipment?
A: Yes, comprehensive Mill Test Certificates detailing chemical composition and mechanical properties are supplied with every order for full traceability.
Q: What are your standard export packaging methods to protect the pipes during shipping?
A: Pipes are typically bundled securely with steel strips, wrapped in waterproof woven fabric, and fitted with plastic end caps to prevent transit damage.
Q: Do you accommodate third-party inspection (TPI) by agencies like SGS, BV, or TÜV prior to dispatch?
A: Yes, we regularly cooperate with independent third-party inspection agencies appointed by clients for pre-shipment verification.
Q: What is the typical production lead time for standard container loads versus bulk project orders?
A: Standard production usually takes between 15 to 25 days, depending on current factory scheduling and specific finishing requirements.
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