JIS G3466 STKR 490 Square & Rectangular Hollow Section
JIS G3466 STKR 490 Square & Rectangular Hollow Section - High-Strength Structural Carbon Steel Tube
Comprehensive material data for JIS G3466 STKR 490 cold-formed or hot-finished carbon steel square and rectangular hollow sections, including chemical composition, mechanical properties, physical properties, equivalent grades, and application guide.
Cold-formed or hot-finished welded or seamless tube; suitable for cutting, drilling, welding, bending, and galvanizing
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JIS G3466 STKR 490 Square & Rectangular Hollow Section Introduction
JIS G3466 STKR 490 is a Japanese standard carbon steel grade for square (SHS) and rectangular (RHS) hollow sections used in structural applications. It offers a minimum tensile strength of 490 MPa and good weldability, making it suitable for building frames, machinery, and general structures. Key features:
- High strength-to-weight ratio
- Excellent cold formability and weldability
- Consistent mechanical properties across wall thicknesses up to 40 mm
- Available in various sizes for versatile design
JIS G3466 STKR 490 Square & Rectangular Hollow Section Chemical Composition
Chemical requirements as per JIS G3466:2014 for STKR 490 grade. The composition is controlled to ensure consistent mechanical properties and good weldability. Note: Values are maximum unless a range is specified.
| Element | Standard Value | Remarks |
|---|---|---|
| C | ≤ 0.18 | Carbon content limited to enhance weldability |
| Si | ≤ 0.55 | Silicon for deoxidation and strength |
| Mn | ≤ 1.65 | Manganese for strength and toughness |
| P | ≤ 0.035 | Phosphorus restricted for ductility |
| S | ≤ 0.035 | Sulfur restricted to avoid hot shortness |
JIS G3466 STKR 490 Square & Rectangular Hollow Section Thermal and Electrical Physical Properties
These physical properties are typical for low-carbon structural steel and are provided for design reference. They are not mandatory in JIS G3466 but are commonly used in engineering calculations. Values are for ambient temperature unless noted.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 205 | GPa | Room temperature |
| Shear Modulus (G) | 79 | GPa | Room temperature |
| Poisson's Ratio (ν) | 0.3 | — | Room temperature |
| Thermal Expansion Coefficient (α) | 11.5 × 10⁻⁶ | /K | 20 – 100 °C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | Room temperature |
| Specific Heat Capacity | 460 | J/(kg·K) | Room temperature |
| Electrical Resistivity (ρ_e) | 0.15 | μΩ·m | Room temperature |
JIS G3466 STKR 490 Square & Rectangular Hollow Section Mechanical Properties
Mechanical properties as specified in JIS G3466:2014 for STKR 490 square and rectangular hollow sections. Tensile test specimens are taken from the flat part of the tube (No.12 or No.5 test piece). Bend test: 180° bend around a mandrel of specified diameter without cracking.
| Property | Standard Requirement | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) - Upper yield or 0.2% proof | ≥ 325 | MPa | Wall thickness ≤ 16 mm |
| Yield Strength (ReH) | ≥ 315 | MPa | 16 < Wall thickness ≤ 40 mm |
| Tensile Strength (Rm) | 490 – 610 | MPa | All thicknesses |
| Elongation (A) - Test piece No.12 | ≥ 23 | % | Wall thickness ≤ 6 mm, gauge length: 50 mm (or specified) |
| Elongation (A) - Test piece No.12 | ≥ 18 | % | 6 < Wall thickness ≤ 12.5 mm |
| Elongation (A) - Test piece No.5 | ≥ 26 | % | Wall thickness ≤ 6 mm, round specimen |
| Elongation (A) - Test piece No.5 | ≥ 21 | % | Wall thickness > 6 mm, round specimen |
| Bend Test (180°) - Bend diameter | 8 × t | mm | Wall thickness ≤ 8 mm (t = wall thickness) |
| Bend Test (180°) - Bend diameter | 10 × t | mm | Wall thickness > 8 mm |
JIS G3466 STKR 490 Square & Rectangular Hollow Section Completely Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3466 | STKR 490 | Original designation; specific to hollow sections |
JIS G3466 STKR 490 Square & Rectangular Hollow Section Application Introduction
STKR 490 hollow sections are engineered for structural applications demanding high strength and rigidity. They provide efficient load-bearing capability with minimal weight. Typical usage areas include:
Product Applications: Steel-framed buildings (columns, beams, trusses), Bridge components and pedestrian overpasses, Conveyor frames and supports, Scaffolding and staging, Light poles and sign supports, Architectural canopies and atriums, Racking and shelving systems
Processed into products: Welded tubular columns and beams, End-plate beam-to-column connections, Space frame nodes and chords, Crane booms and outriggers, Machine bases and frames, Fencing and gate posts, Chassis rails and cross-members
Application industries: Building and construction, Civil engineering (bridges, towers), Industrial machinery manufacturing, Transportation (truck frames, railings), Agricultural equipment, Renewable energy (solar panel structures, wind turbine frames), Material handling and storage systems
JIS G3466 STKR 490 Square & Rectangular Hollow Section Recommended Similar/Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10219 | S355J2H | Comparable strength (min. yield 355 MPa, tensile 470–630 MPa); requires verification of chemical composition and dimensional tolerances |
| China | GB/T 6728 | Q355B | Similar mechanical properties; often used for welded structural hollow sections |
| United States | ASTM A500 | Grade C | Yield 345 MPa, tensile 425 MPa; lower tensile strength but often substituted where design allows |
| Japan | JIS G3101 | SS490 | General structural rolled steel; similar tensile strength, but not a hollow section product |
Notes:
Important considerations when using STKR 490:
- Welding procedures should follow the recommendations for equivalent carbon steel grades (CEV typically ≤ 0.40).
- Post-galvanizing properties are generally good due to low silicon content, but batch testing is advised.
- Dimensional tolerances (side, thickness, corner radii) are defined in JIS G3466 and must be verified for fit-up.
- Impact toughness is not required by the base standard; if low-temperature service is needed, supplementary Charpy testing should be agreed upon.
- For heavily loaded cyclic structures, fatigue verification according to relevant design codes is recommended.
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