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JIS G 3461 Carbon Steel Tubes for Boilers and Heat Exchangers from China Suppliers and Factory
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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Frequently Asked Questions
What is JIS G 3461 and what are its main applications?
JIS G 3461 is a Japanese Industrial Standard that specifies carbon steel tubes used for boilers and heat exchangers. These tubes are designed to withstand high-temperature and high-pressure operating conditions, making them essential in power plants, petrochemical facilities, and industrial heating systems.
What steel grades are available under JIS G 3461?
JIS G 3461 covers several steel grades including STB340, STB410, and STB510. Each grade differs in tensile strength, yield strength, and chemical composition, allowing users to select the most appropriate grade based on their specific operating requirements.
What manufacturing processes are used for JIS G 3461 tubes?
Tubes conforming to JIS G 3461 can be produced through either seamless or welded manufacturing processes. Heat treatment — such as annealing or normalizing — is typically required to achieve the specified mechanical properties, unless otherwise agreed upon between the buyer and manufacturer.
What tests are mandatory 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. These tests ensure the structural integrity and reliability of each tube.
What information must be specified when placing an order for JIS G 3461 tubes?
When ordering, buyers must specify the standard number (JIS G 3461), the required steel grade, dimensions (outer diameter, wall thickness, and length), delivery condition, test requirements, and any special requirements such as hydrostatic testing or specific non-destructive evaluation methods.
How are JIS G 3461 tubes marked and packaged for delivery?
Each tube must be clearly marked with the manufacturer's name or trademark, the steel grade, the tube size, and a heat number or lot identification. Packaging is designed to prevent damage during transportation, ensuring tubes arrive in full compliance with the specified dimensional and surface quality requirements.