JIS G3463 SUS304TB Stainless Steel Tubes For Boiler And Heat Exchanger
JIS G3463 SUS304TB, SUS309TB, SUS310TB, SUS312LTB, SUS316LTB Stainless Steel Tubes for Boiler and Heat Exchanger
Material
The JIS G3463 standard specifies the requirements for stainless steel tubes used in boilers and heat exchangers. The materials covered under this standard include various grades of stainless steel, each offering unique properties suitable for high-temperature and high-pressure applications.
Specification
The specification outlines the dimensions, tolerances, and mechanical properties required for stainless steel tubes. These tubes are primarily used in the construction of heat exchangers, boilers, and other pressure vessels.
Key Features
- Corrosion Resistance: Excellent resistance to oxidation and corrosion, making them suitable for harsh environments.
- High-Temperature Strength: Maintains strength and stability at elevated temperatures.
- Weldability: Good weldability, allowing for easy fabrication and assembly.
- Durability: Long service life with minimal maintenance.
Chemical Composition
The following table presents the chemical composition of the various stainless steel grades covered under JIS G3463:
| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) | Cr (%) | Ni (%) | Mo (%) |
|---|---|---|---|---|---|---|---|---|
| SUS304TB | 0.08 | 1.00 | 2.00 | 0.045 | 0.030 | 18.00 | 8.00 | - |
| SUS309TB | 0.20 | 1.00 | 2.00 | 0.045 | 0.030 | 22.00 | 12.00 | - |
| SUS310TB | 0.25 | 1.00 | 2.00 | 0.045 | 0.030 | 25.00 | 20.00 | - |
| SUS312LTB | 0.03 | 1.00 | 2.00 | 0.045 | 0.030 | 18.00 | 8.00 | 2.00 |
| SUS316LTB | 0.03 | 1.00 | 2.00 | 0.045 | 0.030 | 16.00 | 10.00 | 2.00 |
Mechanical Properties
The mechanical properties of the stainless steel tubes are crucial for their performance in high-pressure and high-temperature applications. The following table summarizes the key mechanical properties of the grades:
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HRB) |
|---|---|---|---|---|
| SUS304TB | 205 | 515 | 40 | 90 |
| SUS309TB | 210 | 520 | 35 | 95 |
| SUS310TB | 210 | 520 | 30 | 95 |
| SUS312LTB | 220 | 530 | 40 | 90 |
| SUS316LTB | 220 | 530 | 40 | 90 |
Steel Grade
The steel grades specified in JIS G3463 are designed to meet the requirements of various applications in the boiler and heat exchanger industries. Each grade has been formulated to provide specific properties that enhance performance and durability.
Application
These stainless steel tubes are widely used in:
- Boilers: For steam generation and heat transfer.
- Heat Exchangers: For efficient heat transfer between fluids.
- Pressure Vessels: To withstand high pressure and temperature conditions.
- Chemical Processing: In environments where corrosion resistance is critical.
Possible Alternative Grades
While the JIS G3463 grades are widely used, there are alternative grades that may be considered based on specific application requirements:
- SUS430: Ferritic stainless steel, suitable for moderate corrosion resistance.
- SUS321: Stabilized austenitic stainless steel, offering better resistance to intergranular corrosion.
- SUS347: Austenitic stainless steel with improved resistance to corrosion at high temperatures.
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