JIS G3466 Carbon Steel Square Tubes

JIS G3466 carbon steel square tubes are widely utilized in civil construction 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 from either welded or seamless steel pipes. It's important to note that JIS G3466 carbon steel square tubes are produced without any heat treatment. These square and rectangular tubes are designed for general structural purposes, meeting the requirements set by JIS G3466. This standard specifically outlines the specifications for square steel pipes used in civil engineering and construction projects. For the STKR 400 and STKR 490 grades, here are the typical dimensions: **Pipe Sizes:** - **Square Sizes:** 40x40mm to 350x350mm - **Rectangular Sizes:** 20x50mm to 200x400mm - **Wall Thicknesses:** 1.6mm to 12mm --- **Chemical Composition:** The chemical composition plays a crucial role in determining the properties of these steel tubes. Here’s a detailed breakdown for each grade: | **Grade Designation** | **C** | **Si** | **Mn** | **P** | **S** | |------------------------|-------|--------|--------|-------|-------| | **STKR 400** | ≤0.25 | - | - | ≤0.040| ≤0.040| | **STKR 490** | ≤0.18 | ≤0.55 | ≤1.50 | ≤0.040| ≤0.040| The controlled levels of carbon, silicon, manganese, phosphorus, and sulfur ensure the structural integrity and durability of these tubes under varying conditions. --- **Mechanical Properties:** The mechanical properties of JIS G3466 carbon steel square tubes are defined by their tensile strength, yield point or proof stress, and elongation percentages. Below are the key values for the specified grades: | **Grade Designation** | **Tensile Strength (N/mm²)** | **Yield Point (N/mm²)** | **Elongation (%)** | |------------------------|------------------------------|--------------------------|--------------------| | **STKR 400** | ≥400 {41} | ≥245 {25} | ≥23 | | **STKR 490** | ≥490 {50} | ≥325 {33} | ≥23 | These values reflect the high standards of quality and performance expected from JIS G3466 carbon steel square tubes, making them suitable for demanding structural applications. In conclusion, JIS G3466 carbon steel square tubes represent a reliable choice for builders and engineers looking for durable and efficient materials for their projects. Whether it's a large-scale construction project or a smaller structural need, these tubes provide excellent support and long-term reliability.

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