JIS G3466 Carbon Steel Square Tube

The JIS G3466 carbon steel square tube is widely used in civil construction and other structural applications. It can be manufactured using various methods such as resistance welding, forge welding, or automatic arc welding to produce a square cross-section. Alternatively, it can be formed from seamless pipes. Importantly, these tubes must be produced without any heat treatment to maintain their mechanical properties.

These square and rectangular carbon steel tubes are designed for general structural use in construction and engineering projects. They are specified under the JIS G3466 standard, which outlines the requirements for square steel pipes used in various building structures.

Common Grades and Dimensions:

  • Grade: STKR 400, STKR 490
  • Square Sizes: 40×40 mm to 350×350 mm
  • Rectangular Sizes: 20×50 mm to 200×400 mm
  • Wall Thickness: 1.6 mm to 12 mm

Chemical Composition:

Designation of Grade 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:

Designation of Grade 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 JIS G3466 carbon steel square tubes are ideal for applications requiring high strength and durability, such as bridges, scaffolding, and industrial frameworks. Their standardized dimensions and mechanical properties ensure compatibility with international construction standards, making them a reliable choice for engineers and builders worldwide.

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