JIS G3463 Stainless Steel Tubes For Boilers and heat exchangers
Jul 14, 2026
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What is the JIS G3463 specification?
JIS G3463 is the Japanese Industrial Standard (JIS) for stainless steel tubes designed for use in boilers, superheaters, heat exchangers, condensers, and pressure equipment. It covers both seamless and welded stainless steel tubes, with common material grades including SUS304TB, SUS304LTB, SUS316TB, SUS316LTB, SUS321TB, SUS347TB, and SUS310TB.
JIS G3463 Method of manufacture
(1) The tube shall be manufactured by seamless process,or by automatic arc welding,laser welding or electric resistance welding process.
(2) The tube shall be heat-treated as specified. However,heat treatments not specified shall be subjected to the agreement between the purchaser and supplier.
(3) The tube shall be adequately treated to remove the oxide film that may adversely affect inspection.
JIS G3463 Appearance
The appearance shall be as follows.
(1) The tube shall be practically straight and its both ends shall be at right angles to the axis of the tube.
(2) The inside and outside surfaces of the tube shall be well-finished and free from defects injurious to use.
JIS G3463 Stainless Steel Tube & Pipe Sizes Supply
Hot Rolled Process - OD 30-500mm ; WT 3-60mm ; L 6-12meter
Cold Drawn Process - OD 10-200mm ; WT 0.5-20mm ; L 1-12meter
Cold Rolled Process - OD 6-200mm ; WT 0.1-20mm ; L 1-12meter
JIS G3463 Heat Exchanger Tubes Chemical Composition
| Grade (Symbol) | C (max) | Si (max) | Mn (max) | P (max) | S (max) | Ni | Cr | Mo | Others |
| SUS304TB | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 8.00-11.00 | 18.00-20.00 | - | - |
| SUS304LTB | 0.035 | 1.00 | 2.00 | 0.045 | 0.030 | 9.00-13.00 | 18.00-20.00 | - | - |
| SUS316TB | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 10.00-14.00 | 16.00-18.00 | 2.00-3.00 | - |
| SUS316LTB | 0.035 | 1.00 | 2.00 | 0.045 | 0.030 | 12.00-15.00 | 16.00-18.00 | 2.00-3.00 | - |
| SUS321TB | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 9.00-13.00 | 17.00-19.00 | - | Ti: 5×C% min |
| SUS347TB | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 9.00-13.00 | 17.00-19.00 | - | Nb: 10×C% min |
| SUS430TB | 0.12 | 0.75 | 1.00 | 0.040 | 0.030 | (0.60 max) | 16.00-18.00 | - | - |
JIS G3463 Boiler Tubes Mechanical Properties
Mechanical tests for JIS G3463 include Tensile Strength, Yield Strength, Elongation, and Hardness.
| Grade | Tensile Strength (min. N/mm²) | Yield Strength (min. N/mm²) | Elongation (min. %) | Hardness (max. HBW/HRB) |
| SUS304TB | 520 | 205 | 35 | 187 HBW / 90 HRB |
| SUS304LTB | 480 | 175 | 35 | 187 HBW / 90 HRB |
| SUS316TB | 520 | 205 | 35 | 187 HBW / 90 HRB |
| SUS316LTB | 480 | 175 | 35 | 187 HBW / 90 HRB |
| SUS321TB | 520 | 205 | 35 | 187 HBW / 90 HRB |
| SUS347TB | 520 | 205 | 35 | 187 HBW / 90 HRB |
| SUS430TB | 410 | 205 | 20 | 183 HBW / 88 HRB |
JIS G3463 stainless steel pipe Dimensional Tolerances
JIS G3463 provides strict tolerances for Outside Diameter (OD) and Wall Thickness (WT).
A. Outside Diameter (OD) Tolerance:
| OD Range (mm) | Hot Finished Seamless | Cold Finished (Seamless/Welded) |
| Under 40 mm | ± 0.40 mm | ± 0.20 mm |
| 40 to 50 mm | ± 0.45 mm | ± 0.25 mm |
| Over 50 to 60 mm | ± 0.50 mm | ± 0.30 mm |
| Over 60 to 70 mm | ± 0.60 mm | ± 0.40 mm |
| Over 70 to 80 mm | ± 0.80 mm | ± 0.45 mm |
B. Wall Thickness (WT) Tolerance:
| Method | Under 2.0 mm | 2.0 mm to 4.0 mm | Over 4.0 mm |
| Cold Finished | ± 0.20 mm | ± 10% | ± 10% |
| Hot Finished | - | ± 0.60 mm | ± 15% |
Temperature Limits for JIS G3463 Stainless Steel Tubes
| JIS Grade | Max Service Temp (Oxidation) | Max Service Temp (Creep Strength) |
| SUS304TB | 850°C (1560°F) | 600°C (1110°F) |
| SUS316TB | 870°C (1600°F) | 650°C (1200°F) |
| SUS321TB | 900°C (1650°F) | 700°C (1290°F) |
| SUS347TB | 900°C (1650°F) | 750°C (1380°F) |
| SUS310STB | 1100°C (2010°F) | 850°C (1560°F) |
| SUS329J3LTB | 850°C (1560°F) | 280°C (535°F) |
| SUS430TB | 815°C (1500°F) | 400°C (750°F) |
| SUS444TB | 850°C (1560°F) | 500°C (930°F) |
How to select JIS G3463 stainless steel tubes?
For Superheaters: Choose SUS347TB (Best creep strength).
For Exhaust Gas Exchangers: Choose SUS321TB (Stable and cost-effective).
For Furnace Components: Choose SUS310STB (Ultimate oxidation resistance).
For Stress Corrosion Environments: Choose SUS444TB or SUS329J3LTB (Noting the temp limits of Duplex).
Suppliers and Manufacturers of JIS G3463 Boiler and Heat Exchanger Pipes
GNEE supplies JIS G3463 stainless steel boiler and heat exchanger tubes with outer diameters ranging from 6.35 to 114.3 mm (1/4" to 4") and wall thicknesses from 0.5 to 12 mm. We offer a variety of surface finishes, including Annealed & Pickled (AP), Bright Annealed (BA), and Electropolished (EP). Our products are available in multiple forms, such as straight tubes, U-bend tubes, coiled tubes, instrumentation tubes, and cut-to-length tubes, to meet diverse application requirements for boilers, economizers, shell-and-tube heat exchangers, condensers, and high-purity fluid systems.
Our Export Inspection & Documentation
When exporting JIS G3463 steel tubes, the following documentation must be provided:
MTC (Material Test Certificate): Compliant with EN 10204 3.1 standards.
Visual & Dimensional Inspection Report: Verifying outer diameter (OD), wall thickness (WT), and length.
Pressure Test Report: Confirming hydrostatic test or eddy current testing (ECT) results.
Heat Treatment Records: Confirming solution annealing process parameters.
Technical Test Requirements
To ensure safety in high-pressure and high-temperature environments, every tube must undergo:
| Test Item | Description / Requirement |
| Flattening Test | No cracks on walls when distance between plates (H) is calculated by formula. |
| Flaring Test | Tube end expanded to 1.2x OD (Austenitic) without cracking. |
| Reverse Flattening | (For Welded) Weld must not crack when opened and flattened. |
| Hydrostatic Test | No leaks at test pressure (calculated based on stress). |
| Nondestructive | 100% Eddy Current (ET) or Ultrasonic (UT) as per JIS Z2344/Z2345. |
| Heat Treatment | Austenitic: Solution Annealing (1010°C-1150°C + Rapid Cooling). |
| Intergranular Corrosion | Required for L-grades (SUS304L/316L) as per JIS G0571/G0575. |
Delivery and Packaging
All products can be shipped via various methods, including Full Container Load (FCL), Less than Container Load (LCL), and air freight. We arrange the most suitable shipping solution for each order to help customers reduce procurement and logistics costs.
Could you let me know:
What grade (e.g., SUS304 or SUS316) are you looking for?
Are you looking for seamless or welded tubes?
What dimensions (outside diameter and wall thickness) do you need?
I can help you narrow down sourcing or compare these against equivalent ASTM standards.
What is the difference between JIS G 3463 and JIS G 3459?
JIS G 3463: Specifies seamless tubes strictly for boiler and heat exchanger service (high temperature/pressure).
JIS G 3459: Specifies welded and seamless pipes for general piping (corrosion resistance, fluid transport) and is not limited to heat exchange applications.
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