JIS G3466 Carbon Steel Square Tube
JIS G3466 carbon steel square tubes are widely used in civil construction and other structural applications. These tubes can be manufactured through various methods such as resistance welding, forge welding, or automatic arc welding, resulting in a square cross-sectional shape. Importantly, JIS G3466 carbon steel square and rectangular tubes are typically produced without heat treatment, ensuring their structural integrity and mechanical properties remain consistent.
The standard specifies the use of square steel pipes for general structural purposes, including building frameworks, bridges, and industrial equipment. Common grades include STKR 400 and STKR 490, with dimensions ranging from small to large sizes to suit different engineering needs.
Typical Sizes:
- Square Tubes: 40x40 mm to 350x350 mm
- Rectangular Tubes: 20x50 mm to 200x400 mm
- Wall Thickness: 1.6 mm to 12 mm
Chemical Composition:
| Grade Designation | Chemical Composition | ||||
|---|---|---|---|---|---|
| C | Si | Mn | P | S | |
| STKR 400 | 0.25 max. | - | - | 0.040 max. | 0.040 max. |
| STKR 490 | 0.18 max. | 0.55 max. | 1.50 max. | 0.040 max. | 0.040 max. |
Mechanical Properties:
| Grade | Tensile Strength N/mm² {kgf/mm²} |
Yield Point / Proof Stress N/mm² {kgf/mm²} |
Elongation % (No.5 Test Piece) |
|---|---|---|---|
| STKR 400 | 400 {41} min. | 245 {25} min. | 23 min. |
| STKR 490 | 490 {50} min. | 325 {33} min. | 23 min. |
These materials are ideal for load-bearing structures due to their high strength-to-weight ratio and excellent formability. Whether used in residential, commercial, or industrial projects, JIS G3466 carbon steel square tubes provide reliable performance and durability. Their compliance with Japanese Industrial Standards ensures quality and consistency across a wide range of applications.
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