Hot-Rolled Structural Steel Tubes are heavy-duty hollow sections engineered for high load-bearing capacity and structural integrity. Produced via high-temperature hot rolling, these tubes feature a homogenous grain structure and stress-relieved profile, making them ideal for dynamic load applications in construction and machinery.
Available Shapes: Square, Rectangular, and Circular (CHS, SHS, RHS)
Standard Grades: ASTM A500 Grade B/C, EN 10210 S275JOH / S355JOH, AS/NZS 1163 C350/C450
Core Advantage: High strength-to-weight ratio, excellent torsional resistance, and consistent weldability for automated fabrication lines.
Specifications
|
Shape |
Size Range (mm / inches) |
Wall Thickness (mm / inches) |
Standard Lengths |
|
Circular (CHS) |
OD: 21.3 - 610 mm (0.84 - 24 in) |
2.0 - 25.0 mm (0.08 - 1.0 in) |
5.8m, 6.0m, 12.0m (Custom up to 18m) |
|
Square (SHS) |
20 x 20 - 500 x 500 mm |
2.0 - 25.0 mm (0.08 - 1.0 in) |
5.8m, 6.0m, 12.0m (Custom up to 18m) |
|
Rectangular (RHS) |
40 x 20 - 600 x 400 mm |
2.0 - 25.0 mm (0.08 - 1.0 in) |
5.8m, 6.0m, 12.0m (Custom up to 18m) |
Dimensional Tolerances: Conforming to ASTM A500 / EN 10210 standards. Outer diameter +/- 1%, Wall thickness +/- 10%.
Straightness: Maximum 2mm per 1m length, total bow not exceeding 0.2% of total length.
Material & Manufacturing
Material Chemistry & Mill Process
Manufactured from killed steel with controlled carbon equivalents (CEV <= 0.43%) to ensure crack-free welding during heavy structural assembly.
Production Flow: Continuous Billet Heating -> Piercing / Roll Forming -> High-Frequency Induction Welding (HFIW) or Seamless Piercing -> On-line Seam Heat Treatment -> Sizing Mill -> Controlled Cooling Bed -> Straightening -> Cold Saw Cutting.
Mill Capability: Annual output of 300,000 metric tons, utilizing direct-fired rotary hearth furnaces and automated sizing blocks to maintain tight wall thickness uniformity.
Quality Inspection
Every production lot undergoes rigorous destructive and non-destructive testing prior to dispatch. Mill Test Reports (MTRs) complying with EN 10204 3.1 are provided with every shipment.
Non-Destructive Testing (NDT):
100% Eddy Current testing or Ultrasonic testing on the weld seam.
Mechanical Testing:
Tension tests (Yield strength, Tensile strength, Elongation), Flattening tests, and Charpy V-notch impact tests (performed at -20°C upon request).
Dimensional Inspection:
Laser-based real-time OD and wall thickness monitoring systems linked to plant control loops.
Applications
Engineered for structural applications demanding predictable load transfer and seismic resilience:
Commercial & Industrial Construction: High-rise building columns, stadium roof trusses, airport terminal framing.
Infrastructure: Bridge cross-beams, highway overhead sign structures, pedestrian overpasses.
Heavy Machinery & Transport: Crane booms, agricultural machinery chassis, railway car frames, truck trailer beds.
Customization & Supply
Surface Treatments:
Bare (oiled), Black paint, Anti-corrosion varnish, Hot-dip galvanizing (zinc coating >= 500g/m2 to ASTM A123 / ISO 1461).
End Finishes:
Plain cut square ends, deburred, or bevel-cut for welding preparation.
Logistics & Packaging:
Bundled with steel strapping, waterproof woven wrapping, or wooden crating for sea freight. Flexible container loading (20GP/40GP) and bulk vessel chartering.
Minimum Order Quantity (MOQ):
5 metric tons per size for standard grades; negotiable for trial orders.
FAQ
Q: What steel grades do you regularly supply for export markets?
A: We regularly produce to ASTM A500 Grade B/C for the North American market and EN 10210 S275JOH / S355JOH for the European market. Other regional standards can be fulfilled upon technical review.
Q: Are Mill Test Reports (MTRs) provided prior to shipment?
A: Yes. EN 10204 3.1 mill test certificates detailing chemical composition, mechanical properties, and heat numbers are transmitted digitally upon material dispatch.
Q: What is your standard lead time for volume orders?
A: Standard mill production lead time is 25 to 35 days depending on rolling schedules and surface coating requirements. Stock items ship within 7 to 10 days.
Q: Can you provide third-party inspection (TPI)?
A: Yes. We routinely accommodate inspection agencies such as SGS, BV, TÜV, and Lloyd's Register at our manufacturing facility before loading.
Q: What are the packaging options for maritime transport?
A: Tubes are bundled tightly with high-tensile steel straps. Waterproof plastic film wrapping is applied for ocean freight protection to prevent rust during transit.
Q: Do you accept cut-to-length customization?
A: Yes. We offer precision cold-saw cutting services to specific project lengths with length tolerances held within +/- 2mm.
Request a Quote
Submit your specification requirements to receive a direct mill quotation within 24 hours.
Required RFQ Parameters:
1.Shape & Dimensions (OD & Wall Thickness)
2.Steel Grade & Standard
3.Total Quantity / Tonnage
4.Destination Port & Target Delivery Window
5.Email: [Insert Email Address]
Direct Inquiry Form: [Link to RFQ Form]
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