Pressure Tubes
- Carbon & Carbon Alloy Steel
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- Pipe Fittings
- Pipe Flanges
- Gasket, Stud Bolt &Nut
- Industrial Valves
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JIS G 3461 (Latest Version) – Carbon Steel Tubes for Boiler and Heat Exchanger
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)
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).
Manufacturing Process
- Tubes are manufactured by seamless or welded processes.
- Heat treatment (annealing or normalizing) is required unless otherwise specified.
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
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.
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.
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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