Product Overview
Carbon Steel Round Tube delivers reliable strength, consistent dimensions, and excellent weldability for structural, mechanical, and industrial applications, reducing fabrication time and installation costs.
Specifications
|
Product Name |
Carbon Steel Round Tube |
|
OD |
20 mm – 219 mm |
|
Wall Thickness |
0.75 mm – 12 mm |
|
Length |
3 m – 12 m (6m standard or customized) |
|
Material |
Q195, Q235, Q355, ASTM A53, A106 |
|
Standard |
ASTM / EN / DIN / JIS |
|
Surface |
Black / Oiled / Painted / Galvanized |
|
Ends |
Plain / Beveled / Threaded |
|
Surface |
Rust prevention, painting, hot-dip galvanizing, polishing |
Why Choose Our Carbon Steel Tubes
- Outer diameter tolerances controlled within standard commercial limits (±0.5 mm to ±1%), minimizing on-site fitting adjustments during fabrication.
- Standard grades (Q195, Q235, Q355) backed by mill test certificates, ensuring precise yield strength (≥235 MPa for Q235) for structural loads.
- Controlled CEV values (typically ≤0.35% for Q235) support standard welding procedures, helping reduce the risk of cracking and rework.
- Hot-dip galvanized options deliver an average zinc coating thickness ≥70 μm (aligned with ISO 1461), helping improve corrosion resistance in outdoor environments.
- Tailored lengths up to 12 meters, specialized end finishes (threaded/beveled), and various surface options to streamline installation.
Customization & Value-Added Services
Length Cutting: Precision cutting to exact project lengths (e.g., fixed lengths of 5.8m for 20GP container loading).
Surface Prep: Shot blasting, anti-rust varnishing, or customized color painting.
End Processing: Custom threading (NPT/BSPT), special beveling angles for welding, or grooving for couplings.
Stenciling & Marking: Custom stenciling with buyer's logo, project name, or specific standard numbers.
Manufacturing Process & Production Flow
Raw Material Slitting: High-grade steel coils inspected for uniform thickness and surface quality.
ERW Forming & Welding: High-frequency induction welding forming a strong, continuous longitudinal seam.
Heat Treatment & Sizing: Normalizing or stress-relieving processes followed by precise sizing rollers to meet tight commercial tolerances.
Non-Destructive & Hydrostatic Testing: Rigorous online testing to detect internal flaws and verify pressure-bearing capacity.
Surface Treatment & Marking: Oiling, painting, galvanizing, and clear heat-number stamping for full lifecycle traceability.
Quality Assurance
Production Capacity: Advanced high-frequency welded (ERW) and seamless production lines ensuring high daily output and strict tolerance control.
Rigorous Testing: Every batch undergoes comprehensive testing (including hydrostatic testing, eddy current testing, and chemical composition analysis) under CNAS/IAF certified guidelines.
Mill Test Certificates (MTC): Full EN 10204 3.1 certification provided with every shipment.
Technical Support & After-Sales Commitment
Engineering Consultation: Dedicated metallurgical and engineering support team to assist with grade selection, wall thickness calculation, and standard compliance.
Quality Claim Policy: Clear, responsive handling procedure for any third-party inspection discrepancies upon arrival at the destination port.
Sample Support: Free sample policy for laboratory testing or quality verification prior to bulk placement.
FAQ
Q: What are your standard packaging options to protect tubes during international ocean freight?
A: Tubes are securely bundled with heavy-duty steel strips, with optional plastic end caps and waterproof outer wrapping available to prevent transit damage or moisture accumulation.
Q: Are third-party inspections by agencies like SGS, BV, or Intertek accepted prior to dispatch?
A: Yes, we routinely accommodate third-party inspections and can arrange joint testing or facility access before final container loading.
Q: Can you accommodate mixed-size container loading for buyers ordering various diameters and wall thicknesses in a single shipment?
A: Yes, we specialize in mixed-container consolidation, allowing wholesale buyers to combine different sizes and specifications to optimize shipping volume and inventory costs.
Q: What is the typical lead time and tolerance for custom end finishes such as threading, beveling, or grooving?
A: Custom end preparations are integrated into the production schedule with minimal impact on lead time, maintaining clean, burr-free cuts that align with standard piping specifications.
Q: How do you handle traceability for steel tubes manufactured from different material grades?
A: Every steel tube is clearly color-coded and stamped with heat numbers, grade identifiers, and size specifications, fully traceable back to the corresponding mill test report.
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