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China Suppliers Factory - JIS G 3461 Carbon Steel Tubes for Boilers and Heat Exchangers
Ordering Information
- 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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Frequently Asked Questions (FAQ)
What is JIS G 3461 and what types of tubes does it cover?
JIS G 3461 is a Japanese Industrial Standard that specifies requirements for carbon steel tubes used in boilers and heat exchangers. It covers both seamless and welded carbon steel tubes designed for high-temperature and pressure service applications.
What steel grades are available under JIS G 3461?
JIS G 3461 includes steel grades such as STB340, STB410, and STB510. Each grade has specific chemical composition requirements and mechanical property specifications including tensile strength, yield strength, and elongation values.
What mandatory tests are required for JIS G 3461 tubes?
Mandatory tests include a tensile test (one per batch), a flattening or bend test for welded tubes, and either a hydrostatic test or a non-destructive test (NDT) such as eddy current or ultrasonic testing to ensure product integrity.
What information must be specified when placing an order?
When ordering, buyers must specify the standard number (JIS G 3461), the desired steel grade, dimensions (outer diameter, wall thickness, and length), required test methods, delivery condition (e.g., annealed or normalized), and any special requirements.
What heat treatment is applied to JIS G 3461 tubes?
Unless otherwise specified by the buyer, all JIS G 3461 tubes are required to undergo heat treatment — either annealing or normalizing — to achieve the appropriate mechanical properties and ensure dimensional stability.
How are JIS G 3461 tubes marked and packaged for delivery?
Each tube must be clearly marked with the manufacturer's name or trademark, steel grade, size, and heat number or lot identification. Packaging is designed to protect the tubes from damage during storage and transportation.