JIS G3466 Carbon Steel Square Tube
The JIS G3466 carbon steel square tube is widely used in civil construction and other structural applications. These tubes can be manufactured using various methods, including welded steel pipes (such as resistance welding, forge welding, or automatic arc welding) or seamless pipes, which are then formed into a square cross-section. Importantly, JIS G3466 carbon steel square tubes must be produced without any heat treatment to ensure their mechanical properties remain consistent.
This standard specifies the requirements for square and rectangular steel tubes made from carbon steel, primarily intended for general structural purposes in civil engineering and construction projects. The two common grades available under this specification are STKR 400 and STKR 490, each with different dimensions and wall thicknesses to suit various structural needs.
Key Dimensions:
- Square Tubes: 40×40 mm to 350×350 mm
- Rectangular Tubes: 20×50 mm to 200×400 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 Designation |
Tensile Strength
N/mm² {kgf/mm²} |
Yield Point or 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 chosen for their strength, durability, and cost-effectiveness, making them ideal for use in scaffolding, support structures, and load-bearing components in construction. Their compliance with the JIS G3466 standard ensures quality and reliability, meeting international standards for structural steel products.
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