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JIS G3463 Carbon Steel & Molybdenum Alloy Pipes for Boilers | China Suppliers & Factory
Ordering Information
When ordering pipes under this standard, the following must be specified:
- Standard number (JIS G 3463)
- Steel grade (e.g., STB340, STBA12, etc.)
- Dimensions (outer diameter and wall thickness)
- Length (fixed or random)
- Test requirements (e.g., hydrostatic or nondestructive testing)
- Additional requirements (if any, such as special tolerances or heat treatment)
Steel Grades and Chemical Composition
The standard covers several grades, categorized into:
▶ (A) Carbon Steel Pipes
| Grade | C (max) | Si | Mn | P (max) | S (max) |
|---|---|---|---|---|---|
| STB340 | ≤0.25 | ≤0.35 | ≤0.60 | ≤0.035 | ≤0.035 |
| STB410 | ≤0.30 | ≤0.35 | ≤0.60 | ≤0.035 | ≤0.035 |
| STB510 | ≤0.30 | ≤0.35 | 0.30–0.90 | ≤0.035 | ≤0.035 |
▶ (B) Molybdenum & Alloy Steel Pipes
| Grade | C (max) | Si | Mn | Mo | P (max) | S (max) |
|---|---|---|---|---|---|---|
| STBA12 | ≤0.15 | 0.25–0.50 | 0.30–0.60 | 0.45–0.65 | ≤0.030 | ≤0.030 |
| STBA20 | ≤0.15 | 0.25–0.50 | 0.30–0.60 | 0.45–0.65 | ≤0.030 | ≤0.030 |
| STBA22 | ≤0.15 | ≤0.50 | 0.30–0.60 | 0.80–1.10 | ≤0.030 | ≤0.030 |
| STBA23 | ≤0.15 | ≤0.50 | 0.30–0.60 | 1.15–1.50 | ≤0.030 | ≤0.030 |
| STBA24 | ≤0.10 | ≤0.10 | 0.30–0.60 | 0.90–1.10 | ≤0.020 | ≤0.010 |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| STB340 | ≥340 | ≥175 | ≥30 |
| STB410 | ≥410 | ≥205 | ≥25 |
| STB510 | ≥510 | ≥275 | ≥21 |
| STBA12 | ≥360 | ≥175 | ≥30 |
| STBA20 | ≥360 | ≥175 | ≥30 |
| STBA22 | ≥410 | ≥205 | ≥25 |
| STBA23 | ≥440 | ≥225 | ≥22 |
| STBA24 | ≥415 | ≥205 | ≥20 |
Manufacturing & Heat Treatment
- Pipes are manufactured by seamless or welding processes.
- Heat treatment (annealing, normalizing, or tempering) is required for certain grades.
- Welded pipes must undergo nondestructive testing (NDT) unless otherwise agreed.
Inspection & Testing Requirements
- Hydrostatic testing (or nondestructive testing as an alternative).
- Tensile test (one test per batch).
- Flattening test / Flaring test (for welded pipes).
- Hardness test (if specified).
- Chemical analysis (per heat).
- Visual and dimensional inspection.
Marking & Certification
Each pipe must be marked with:
- Manufacturer's name or trademark
- Standard number (JIS G 3463)
- Steel grade
- Size (OD × thickness)
- Heat number
📄 Inspection certificate must be provided upon request.
Tolerance Requirements
- Outer diameter: ±1% or ±0.5 mm (whichever is greater).
- Wall thickness: Varies by manufacturing method (typically -10% to +12.5%).
- Length: For fixed lengths, ±100 mm is common.
📌 Conclusion
JIS G 3463 ensures the quality of boiler and heat exchanger tubes by specifying material composition, mechanical properties, testing, and inspection criteria. The latest version may include updates on allowable tolerances, testing methods, or additional grades, so always refer to the most recent edition for compliance.
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Frequently Asked Questions (FAQ)
QWhat is JIS G 3463 and what does it cover?
JIS G 3463 is a Japanese Industrial Standard that specifies the requirements for steel tubes used in boilers and heat exchangers. It covers carbon steel and molybdenum alloy steel pipes, including their chemical composition, mechanical properties, manufacturing processes, inspection requirements, and tolerances.
QWhat are the main steel grades available under JIS G 3463?
The standard includes carbon steel grades such as STB340, STB410, and STB510, as well as molybdenum and alloy steel grades including STBA12, STBA20, STBA22, STBA23, and STBA24. Each grade has distinct chemical compositions and mechanical performance characteristics suited for different operating conditions.
QWhat manufacturing methods are permitted under JIS G 3463?
Pipes can be manufactured using either seamless or welded processes. Welded pipes are required to undergo nondestructive testing (NDT) to ensure weld integrity, unless a different arrangement has been specifically agreed upon between the buyer and manufacturer.
QWhat testing and inspection are required for JIS G 3463 pipes?
Required tests include hydrostatic or nondestructive testing, tensile testing (one per batch), flattening or flaring tests for welded pipes, hardness testing (if specified), chemical analysis per heat, and visual and dimensional inspection to verify compliance with the standard.
QWhat dimensional tolerances apply to JIS G 3463 pipes?
Outer diameter tolerances are ±1% or ±0.5 mm, whichever is greater. Wall thickness tolerances vary depending on the manufacturing method, typically ranging from -10% to +12.5%. For fixed-length pipes, a length tolerance of ±100 mm is commonly applied.
QWhat information must be provided when placing an order for JIS G 3463 pipes?
When ordering, buyers must specify the standard number (JIS G 3463), the required steel grade, outer diameter and wall thickness, desired length (fixed or random), applicable test requirements such as hydrostatic or nondestructive testing, and any additional requirements such as special tolerances or specific heat treatment conditions.