Tianjin Brisk Steel is one of the manufacturers of JIS G3466 STK490 Steel Tubes in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.
What is JIS G3466 STK490?
The JIS G3466 specification standardizes carbon steel square and rectangular tubes used for general structural purposes.
STK490: Represents a high-tensile grade within this standard. The "490" signifies a minimum tensile strength of 490 MPa, providing significantly greater load-bearing capacity compared to lower grades like STK400. This enables engineers to specify thinner walls and lighter steel profiles without compromising structural safety.
Key Features & Engineering Advantages
1. Superior Strength-to-Weight Ratio
With a minimum yield strength of 325 MPa and tensile strength of 490 MPa, STK490 tubes allow for optimized structural configurations. Reducing overall steel weight lowers material acquisition costs, minimizes foundation loads, and reduces international shipping expenses.
2. Outstanding Torsional and Bending Resistance
The closed, symmetrical geometric profile of square and rectangular hollow sections (SHS/RHS) handles multi-directional loading far more efficiently than traditional open steel shapes (such as I-beams or angle iron). This makes them highly effective for columns and trusses.
3. Excellent Weldability & Fabricability
Despite its high strength, the chemical composition of STK490 is precisely balanced to maintain high weldability. Fabricators can easily cut, drill, bend, and weld these tubes using standard workshop techniques, saving precious labor time.
4. High Aesthetic Quality
Featuring flat surfaces, uniform corner radii, and smooth finishes, our JIS G3466 sections are ideal for Architecturally Exposed Structural Steel (AESS) where the steel framework remains visible to the public.
Technical Specifications & Size Portfolio
| Parameter | Specifications |
| Standard Compliance | JIS G3466 |
| Grade | STK490 (Alternative grades: STK400 available) |
| Shape | Square Hollow Sections (SHS) & Rectangular Hollow Sections (RHS) |
| Square Size Range | 20mm x 20mm to 350mm x 350mm |
| Rectangular Size Range | 30mm x 20mm to 400mm x 200mm |
| Wall Thickness (WT) | 1.2mm to 16.0mm |
| Length Options | 5.8m, 6m, 11.8m, 12m, or custom cut-to-length options |
| Surface Treatment | Bare/Oiled, Anti-Rust Primer/Black Painting, Hot-Dip Galvanized (HDG) |
Primary Global Applications
Our high-strength STK490 structural tubes are integrated into multi-sector international projects:
- Commercial & Civil Architecture: Column structures, roof trusses, space frames, and curtain wall supports for airports, stadiums, and high-rises.
- Industrial Machinery & Logistics: Heavy-duty equipment frames, conveyor columns, automated storage racks, and material handling systems.
- Infrastructure Engineering: Highway sign gantries, bridge bracing, safety barriers, and pedestrian walkway supports.
- Renewable Energy Infrastructure: Ground mount racks and torque tubes for large-scale solar tracking installations.
Frequently Asked Questions (FAQ)
Q: What is the main difference between STK400 and STK490 under JIS G3466?
A: The primary difference is tensile and yield strength. STK400 has a minimum tensile strength of 400 MPa, while STK490 boasts a minimum tensile strength of 490 MPa. STK490 is chosen for heavy-load infrastructure, high-rise framing, or any engineering design where reducing the structural weight of the steel is critical.
Q: Can JIS G3466 STK490 steel tubes be hot-dip galvanized?
A: Yes, absolutely. We offer premium Hot-Dip Galvanizing (HDG) complying with international standards like EN ISO 1461 or ASTM A123. The controlled chemistry of our steel ensures excellent zinc adhesion, protecting the tubes from harsh, humid, or coastal atmospheric corrosion for decades.
Q: How do you protect the hollow sections from damage during ocean shipping?
A: To protect your material during long maritime transits, the tubes are securely bound into tight hexagonal bundles using high-tensile steel strapping. For maximum protection against sea-salt humidity, we can apply an anti-rust varnish coating and wrap the bundles in waterproof PVC woven sheets.
Q: Do you support custom lengths and third-party inspections?
A: Yes. We can cut tubes to exact specified blueprint lengths to minimize your on-site fabrication waste. We also fully welcome third-party inspection (TPI) companies such as SGS, Bureau Veritas (BV), or TÜV to verify product dimensions, chemical grading, and packing before dispatch.
Contact Us
If you are interested in our JIS G3466 STK490 Steel Tubes, please contact us with your specific requirements (specifications, quantity, material, surface treatment, etc.), and we will provide you with a detailed quotation and product sample as soon as possible. We look forward to establishing long-term cooperative relationships with you!!
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