JIS G3444 Tubes | Seamless & Welded Carbon Steel Pipes

JIS G3444 CS Structure Pipe

This standard covers carbon steel tubes used in general structural applications (e.g., construction, machinery, and non-pressure purposes).

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JIS G3444 Carbon Steel Pipes for General Structures

This standard covers carbon steel tubes used in general structural applications (e.g., construction, machinery, and non-pressure purposes).

When ordering, the following must be specified:

- Standard number (JIS G 3444)

- Steel grade (e.g., STK290, STK400)

- Dimensions (outer diameter, wall thickness, length)

- Type of tube (plain end, threaded, etc.)

- Quantity

| STK290 | 290 | – | 30 |

| STK400 | 400 | 235 | 25 |

| STK490 | 490 | 325 | 20 |

| STK500 | 500 | 355 | 18 |

- Tubes are manufactured by welding (electric resistance welding, arc welding, etc.) or seamless processes.

- Carbon (C): Varies by grade (e.g., ≤0.30% for STK290)

- Phosphorus (P): ≤0.040%

- Sulfur (S): ≤0.040%

- Tensile test (for mechanical properties)

- Bend test or flattening test (for ductility)

- Hydrostatic test or non-destructive testing (NDT) (for weld integrity)

- Visual inspection (surface defects, dimensions)

- Tubes must be free from harmful defects.

- Light surface imperfections may be permitted if within tolerance.

Each tube must be marked with:

- Manufacturer’s name or trademark

- Steel grade (e.g., STK400)

- Size (outer diameter × wall thickness)

- Standard number (JIS G 3444)

Latest Revision (2025 Updates, if applicable)

- Enhanced NDT requirements for welded joints.

- Revised chemical composition limits for improved weldability.

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