JIS G 3461 Carbon Steel Tube for Boilers & Heat Exchangers

JIS G3461 Steel Tube

JIS G 3461 specifies the requirements for carbon steel tubes used in boilers, heat exchangers, and pressure vessels. These tubes are suitable for high-temperature service.

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JIS G 3461 (Latest Version) – Carbon Steel Tubes for Boiler and Heat Exchanger

1. Scope

JIS G 3461 specifies the requirements for carbon steel tubes used in boilers, heat exchangers, and pressure vessels. These tubes are suitable for high-temperature service.

2. Ordering Information

When ordering, the following must be specified:

- Standard number (JIS G 3461)

- Steel grade (e.g., STB340, STB410, STB510)

- Dimensions (outer diameter, wall thickness, length)

- Test requirements (if additional tests are needed)

- Delivery condition (e.g., annealed, normalized)

- Special requirements (if any, such as hydrostatic testing or non-destructive testing)

3. Material Requirements

3.1 Steel Grades and Chemical Composition

- STB340, STB410, STB510, etc.

- Specifies carbon (C), manganese (Mn), phosphorus (P), sulfur (S), and silicon (Si) content limits.

3.2 Mechanical Properties

- Tensile strength, yield strength, and elongation requirements for each grade.

- Hardness limits (if applicable).

4. Manufacturing Process

- Tubes are manufactured by seamless or welded processes.

- Heat treatment (annealing or normalizing) is required unless otherwise specified.

5. Test Requirements

5.1 Mandatory Tests

- Tensile test (one test per batch)

- Flattening test or bend test (for welded tubes)

- Hydrostatic test or non-destructive test (NDT) (eddy current, ultrasonic, etc.)

5.2 Optional Tests (upon agreement)

- Impact test (for low-temperature applications)

- Hardness test

- Grain size test

6. Inspection & Acceptance Criteria

- Tubes must meet dimensional tolerances (outer diameter, wall thickness, length).

- Surface defects must be within acceptable limits.

- Re-testing is allowed if initial tests fail under specified conditions.

7. Marking & Packaging

- Each tube must be marked with:

- Manufacturer’s name or trademark

- Steel grade

- Size

- Heat number or lot identification

- Packaging must prevent damage during transportation.

8. Additional Notes

- Compliance with JIS G 3461 ensures suitability for high-temperature and pressure applications.

- Latest revisions may include updates to testing methods, chemical composition, or mechanical property requirements.

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