JIS G3466 STKR 400 SHS/RHS Pipe
JIS G3466 STKR 400 SHS/RHS Pipe: Comprehensive Material Data & Equivalents
In-depth material data for JIS G3466 STKR 400 square and rectangular carbon steel structural tubes: chemical composition, mechanical/physical properties, equivalent grades, applications.
Hot-finished, cold-formed, welding, sawing, drilling, milling, bending, forming
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JIS G3466 STKR 400 SHS/RHS Pipe Introduction
JIS G3466 STKR 400 is a Japanese carbon steel grade used for square (SHS) and rectangular (RHS) hollow sections intended for general structural applications. It is produced by hot-finished or cold-formed processes without adding specific alloying elements, ensuring good weldability and formability. The grade delivers a minimum yield strength of 245 MPa (for thickness ≤40 mm) and tensile strength in the range 400–510 MPa, offering a balanced combination of strength and ductility.
- Wide availability in multiple sizes and wall thicknesses
- Suitable for welding, cutting, bending, and machining
- Economical choice for structural frameworks, columns, beams, and trusses
- Surface is typically as-manufactured, with optional protective coatings
It conforms to the Japanese Industrial Standard JIS G3466 and is comparable to several international structural hollow section grades.
JIS G3466 STKR 400 SHS/RHS Pipe Chemical Composition
Chemical composition according to JIS G3466. The steel is non-alloy carbon steel with controlled phosphorus and sulfur levels to ensure ductility and weldability. No intentional addition of microalloying elements is required; manganese may be adjusted to meet strength requirements.
| Element | Standard Value (max, %) | Remarks |
|---|---|---|
| C | 0.25 | Carbon content ensures weldability and strength |
| Si | 0.40 | Deoxidation element, typical for structural steels |
| Mn | 1.60 | Added for strength; no minimum specified |
| P | 0.040 | Controlled to avoid embrittlement |
| S | 0.040 | Controlled to maintain hot workability |
JIS G3466 STKR 400 SHS/RHS Pipe Physical Properties
Physical and thermal data are typical for carbon steels similar to STKR 400. These values are not mandatory in JIS G3466 and serve as engineering approximations at ambient temperature unless otherwise noted.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic Modulus (E) | 200 | GPa | Room temperature |
| Shear Modulus (G) | 80 | GPa | Room temperature (estimated from E and ν) |
| Poisson's Ratio (ν) | 0.3 | – | Within elastic range |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶ / °C | Range 0 – 100 °C |
| Thermal Conductivity (λ) | 52 | W/(m·K) | At 20 °C |
| Specific Heat Capacity (cp) | 486 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρe) | 0.15 | μΩ·m | At 20 °C |
JIS G3466 STKR 400 SHS/RHS Pipe Mechanical Properties
Mechanical properties as specified in JIS G3466. Yield strength and tensile strength apply to longitudinal direction. Elongation test pieces depend on tube wall thickness. Bend test ensures adequate formability without cracking. No impact test is mandated for this grade.
| Property | Standard Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥245 | MPa | Wall thickness ≤ 40 mm |
| Yield Strength (ReH) | ≥235 | MPa | Wall thickness > 40 mm and ≤ 60 mm |
| Tensile Strength (Rm) | 400 – 510 | MPa | All thicknesses |
| Elongation (A) | ≥23 | % | Thickness ≤ 8 mm, test piece No. 5 (longitudinal) |
| Elongation (A) | ≥17 | % | 8 mm < thickness ≤ 12 mm, test piece No. 5 (longitudinal) |
| Elongation (A) | ≥23 | % | Thickness > 12 mm, test piece No. 14A (longitudinal) |
| Bend Test | No cracks | – | Bend angle 90°, inside radius 1.5 t (t ≤ 12 mm) |
| Bend Test | No cracks | – | Bend angle 90°, inside radius 2.0 t (t > 12 mm) |
JIS G3466 STKR 400 SHS/RHS Pipe Completely Equivalent / Directly Replaceable Standards and Grades
The following standards and grades are often considered fully interchangeable or are the direct national counterparts for JIS G3466 STKR 400 square/rectangular hollow sections. Minor differences in chemistry or mechanical properties may exist; always verify with design requirements.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3466 | STKR 400 | Original specification – square/rectangular structural tubes |
| Europe | EN 10219-1 | S235JRH | Cold-formed structural hollow sections – comparable strength range |
| Europe | EN 10210-1 | S235JRH | Hot-finished structural hollow sections – similar tensile properties |
| USA | ASTM A500 | Grade A (shaped) | Structural tubing – shaped (square/rectangular) grade with slightly higher minimum yield |
| China | GB/T 6728 | Q235 (square/rectangular) | Cold-formed hollow sections for general structures – equivalent strength level |
JIS G3466 STKR 400 SHS/RHS Pipe Application Introduction
JIS G3466 STKR 400 tubes are designed for load-bearing structures where a moderate strength level and good toughness are required.
- Construction: Columns, beams, roof trusses, space frames, purlins
- Infrastructure: Bridge elements, sign supports, guardrails, lighting poles
- Machinery & equipment: Machine frames, conveyors, agricultural implements, trailers
- General fabrication: Racks, storage systems, handrails, fencing
The square and rectangular sections provide efficient bending and compression resistance, combined with ease of connection by welding or bolting.
Product Applications: Structural steel frames for commercial and industrial buildings, Purlins, girts, and secondary framing members, Square/rectangular columns and portal frames, Truck and trailer chassis components, Scaffolding and temporary structures, Machine bases and support structures
Processed into products: Welded sections cut to length and drilled for bolted connections, Corner connectors for frame assemblies, Base plates and end plates welded to hollow sections, Brackets, cleats, and stiffeners, Punched or notched sections for modular construction, Pre‑galvanized or painted sections for exposed applications
Application industries: Building and Construction, Civil Engineering / Infrastructure, Agricultural Machinery, Material Handling and Storage, Automotive (chassis, trailers), General Metal Fabrication
JIS G3466 STKR 400 SHS/RHS Pipe Similar / Alternative Materials with Comparable Performance
These grades offer analogous mechanical characteristics and may be considered when STKR 400 is unavailable, or when a slight increase in strength is acceptable. Engineering assessment is advised.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3466 | STKR 490 | Higher strength (min. yield 325 MPa) – may substitute with design adjustment |
| Europe | EN 10219-1 | S275J2H | Higher yield (275 MPa) – suitable for heavier loading |
| USA | ASTM A500 | Grade B (shaped) | Significantly higher yield (315 MPa) – stronger alternative |
| China | GB/T 6728 | Q345 (square/rectangular) | Elevated yield (345 MPa) – used when greater capacity is needed |
Notes:
The values listed are based on JIS G3466:2020. Product analysis tolerances may apply per the standard. Dimensional tolerances on side length, wall thickness, corner radii, and straightness are defined in the standard and must be ordered accordingly. This grade does not require impact testing; for applications needing guaranteed toughness, consider higher-strength or fine‑grain grades. For welded fabrication, preheat and welding consumable selection should follow established structural steel practices. The information provided does not replace formal engineering evaluation.
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