Alloy Steel Square Tube
Manufacturer | EPC Project Supplier | Structural Steel Exporter.
Product Overview
We are a professional manufacturer and EPC project supplier of Alloy Steel Square Tubes (SHS – Square Hollow Sections) used in structural engineering, industrial construction, and heavy fabrication projects.
Our products are manufactured in accordance with ASTM A500, EN 10219, and project-specific engineering specifications, ensuring reliable mechanical strength, weldability, and dimensional consistency for load-bearing applications.
Each product is fully traceable via heat number and supplied with Mill Test Certificate (EN 10204 3.1 / 3.2 available upon request), supporting engineering verification and international procurement compliance.
We supply to North America, Europe, the Middle East, and Southeast Asia through distributors, EPC contractors, and industrial end-users.
Project Supply Experience
We support project-based supply records that can be verified through documents, inspection reports, and shipment data upon request.
Project Reference 1 – Industrial Warehouse Structure (Middle East)
•Region: Saudi Arabia.
•Product: Alloy Steel Square Tube SHS 120×120×6mm.
•Quantity: Approx. 2,800 tons.
•Application: Industrial warehouse steel structure.
•Documentation: MTC, packing list, shipment records available for qualified buyers.
Project Reference 2 – Commercial Steel Structure (GCC Region)
•Region: United Arab Emirates.
•Standard: EN 10219 S355.
•Quantity: Approx. 1,600 tons.
•Application: Mid-rise commercial steel framework.
•Inspection: Third-party inspection (BV / SGS available upon request).
Project Reference 3 – Distribution Supply (North America)
•Region: United States.
•Standard: ASTM A500 Grade B.
•Supply Type: Long-term distributor supply.
•Application: Structural fabrication and steel framing.
•Status: Ongoing repeat orders.
Manufacturing Capacity & Supply Reliability
We operate a fully integrated production system designed for stable long-term industrial supply:
Annual production capacity: 200,000+ metric tons.
High-frequency welded production lines (HFW).
Certified steel coil supply chain (approved mills only).
Container-optimized export packaging system.
Project-based production scheduling capability.
Operational Performance Indicators (Internal System Audit)
On-time delivery rate: ≥ 96%
Batch consistency rate: ≥ 98%
Production defect rate: ≤ 0.3%
Product Specifications
Product Type
Square Hollow Section (SHS)
Size Range
20 × 20 mm to 300 × 300 mm
Custom engineering sizes available
Wall Thickness
1.0 mm – 12.0 mm
Length
5.8 m / 6 m / 12 m / customized
Surface Options
Black (mill finish)
Anti-rust oiled
Hot-dip galvanized (HDG)
Standards
ASTM A500 Grade B / Grade C
EN 10219 S235 / S275 / S355
Project-specific standards available
Chemical Composition
|
Element |
Range (%) |
|
C |
≤ 0.23 |
|
Mn |
0.30 – 1.50 |
|
Si |
≤ 0.50 |
|
P |
≤ 0.030 |
|
S |
≤ 0.030 |
|
Cr |
Trace controlled |
|
Mo |
Optional trace |
Engineering Purpose:
Controlled alloy design ensures balanced strength, weldability, and long-term structural stability.
Mechanical Properties
|
Property |
Value |
|
Yield Strength |
≥ 315 MPa |
|
Tensile Strength |
≥ 400 MPa |
|
Elongation |
≥ 23% |
Testing System:
•ISO 17025 laboratory testing.
•Heat number traceability for each batch.
•Retained test records available for audit and project review.
Quality Control & Traceability System
Our production system is designed for full industrial traceability and procurement audit requirements:
•Certified raw material from approved steel mills
•High-frequency welding (HFW) process
•Online eddy current weld inspection
•Ultrasonic (UT) and NDT verification
•100% dimensional inspection
•Mechanical and chemical laboratory testing
•Heat number marking and batch traceability
Quality Management System
•ISO 9001 certified manufacturing system
•ISO 17025 accredited laboratory capability
•SPC statistical process control
•Third-party inspection: SGS / BV / TÜV available
Engineering & Procurement Advantages
Structural Performance Reliability: Controlled alloy composition ensures stable load-bearing performance for structural and industrial applications.
Weldability Control (CEV < 0.45): Strict carbon equivalent control ensures excellent weldability in field and workshop fabrication.
Dimensional Precision for EPC Projects: Tight tolerance control reduces installation deviation in large-scale structural assembly.
Batch Consistency for Long-Term Projects: SPC monitoring ensures stable performance across continuous production batches.
Verified Supply System: Designed for EPC contractors, distributors, and long-term industrial procurement contracts.
Inspection & Buyer Verification Access
To support international procurement compliance, we provide:
Mill Test Certificate (EN 10204 3.1 / 3.2)
Third-party inspection (SGS / BV / TÜV) before shipment
Spectrometer chemical analysis report
Mechanical test reports (tensile / yield / elongation)
Full heat number traceability system
Buyer Verification Options (Upon Request)
Factory audit invitation
Live production inspection
Pre-shipment inspection report (photo/video)
Third-party re-testing support
Packaging, Delivery & Trade Terms
Packaging
Steel strip bundled packing
Waterproof wrapping
End protection caps (optional)
Container loading optimization
Lead Time
Standard orders: 15–25 days
Project orders: 25–40 days
MOQ
5–10 tons per specification (trial order available)
Payment Terms
T/T
L/C at sight (qualified buyers)
FAQ
Q: Are you a manufacturer or trading company?
A: We are a direct manufacturer and EPC project supplier with integrated production and export capability.
Q: Can project references be verified?
A: Yes. Project documentation can be provided for qualified buyers under inquiry or NDA.
Q: What standards do you follow?
A: ASTM A500, EN 10219, and project-specific engineering standards.
Q: Do you support third-party inspection?
A: Yes, SGS, BV, and TÜV inspections are available before shipment.
Q: What is your production capacity?
A: Over 200,000 tons annually with stable long-term supply capability.
Q: How do you ensure quality consistency?
A: Through ISO 9001 systems, ISO 17025 lab testing, SPC control, and full NDT inspection with heat number traceability.
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