JIS G3466 Carbon Steel Square Tubes

JIS G3466 carbon steel square tubes find extensive use in civil construction projects and various structural applications. These tubes can be manufactured through different methods including resistance welding, forge welding, or automatic arc welding to form square cross-sections. Alternatively, they can also be produced from seamless steel pipes. It’s important to note that JIS G3466 carbon steel square tubes are typically made without undergoing any heat treatment process. These square and rectangular tubes are specifically designed for general structural purposes, including civil engineering and construction projects. JIS G3466 outlines the specifications for these square steel pipes. For grades STKR 400 and STKR 490, the dimensions are as follows: - **Square Sizes**: 40x40 mm up to 350x350 mm - **Rectangular Sizes**: 20x50 mm up to 200x400 mm - **Wall Thicknesses**: 1.6 mm to 12 mm --- **Chemical Composition:** Below are the chemical compositions for the specified grades: | Grade | C (max.) | Si (max.) | Mn (max.) | P (max.) | S (max.) | |-----------|----------|-----------|-----------|----------|----------| | STKR 400 | 0.25% | - | - | 0.040% | 0.040% | | STKR 490 | 0.18% | 0.55% | 1.50% | 0.040% | 0.040% | --- **Mechanical Properties:** The mechanical properties for the respective grades are as follows: | 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 square steel tubes provide excellent durability and strength, making them ideal for construction and structural support. Their versatility in size and thickness ensures they can meet a wide range of requirements in both domestic and industrial settings. Whether it's for framing, supports, or decorative elements, JIS G3466 carbon steel square tubes offer reliable performance across multiple applications.

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