Description
JIS G3463 SUS304TB, SUS304HTB, SUS304LTB, SUS309TB, SUS309STB Stainless Steel Boiler Tube
Material Specification
JIS G3463 is a Japanese industrial standard that specifies the requirements for stainless steel boiler tube and heat exchanger tubes. These tubes are primarily used in high-temperature environments due to their excellent corrosion resistance and mechanical properties. The grades covered under this specification include SUS304TB, SUS304HTB, SUS304LTB, SUS309TB, and SUS309STB.
Key Features
- Corrosion Resistance: These stainless steel grades offer excellent resistance to corrosion, making them suitable for use in harsh environments.
- High-Temperature Strength: The materials can withstand high temperatures, which is essential for boiler and heat exchanger applications.
- Durability: The tubes are designed to have a long service life, reducing the need for frequent replacements.
- Versatility: Suitable for a wide range of applications, including industrial boilers and heat exchangers.
Chemical Composition
Below is the typical chemical composition for these stainless steel boiler tube grades:
| Element | SUS304TB | SUS304HTB | SUS304LTB | SUS309TB | SUS309STB |
|---|---|---|---|---|---|
| Carbon (C) | ≤ 0.08% | ≤ 0.08% | ≤ 0.03% | ≤ 0.20% | ≤ 0.20% |
| Silicon (Si) | ≤ 1.00% | ≤ 1.00% | ≤ 1.00% | ≤ 1.00% | ≤ 1.00% |
| Manganese (Mn) | ≤ 2.00% | ≤ 2.00% | ≤ 2.00% | ≤ 2.00% | ≤ 2.00% |
| Phosphorus (P) | ≤ 0.045% | ≤ 0.045% | ≤ 0.045% | ≤ 0.045% | ≤ 0.045% |
| Sulfur (S) | ≤ 0.030% | ≤ 0.030% | ≤ 0.030% | ≤ 0.030% | ≤ 0.030% |
| Nickel (Ni) | 8.00-10.50% | 8.00-10.50% | 8.00-12.00% | 12.00-15.00% | 12.00-15.00% |
| Chromium (Cr) | 18.00-20.00% | 18.00-20.00% | 18.00-20.00% | 22.00-24.00% | 22.00-24.00% |
Mechanical Properties
The mechanical properties of these stainless steel boiler tube grades are as follows:
| Property | SUS304TB | SUS304HTB | SUS304LTB | SUS309TB | SUS309STB |
|---|---|---|---|---|---|
| Tensile Strength (MPa) | ≥ 520 | ≥ 520 | ≥ 520 | ≥ 515 | ≥ 515 |
| Yield Strength (MPa) | ≥ 205 | ≥ 205 | ≥ 175 | ≥ 205 | ≥ 205 |
| Elongation (%) | ≥ 35 | ≥ 35 | ≥ 35 | ≥ 40 | ≥ 40 |
| Hardness (HB) | ≤ 187 | ≤ 187 | ≤ 187 | ≤ 187 | ≤ 187 |
Steel Grade
- SUS304TB: Standard grade with good corrosion resistance and formability.
- SUS304HTB: High-temperature variant of SUS304TB.
- SUS304LTB: Low carbon version for improved weldability.
- SUS309TB: Higher chromium and nickel content for better high-temperature performance.
- SUS309STB: Similar to SUS309TB but with slight variations for specific applications.
Application
These stainless steel boiler tube are widely used in:
- Industrial boilers
- Heat exchangers
- Chemical processing equipment
- Power generation plants
- Petrochemical industries
Possible Alternative Grades
- SUS316TB: Offers better corrosion resistance, especially in chloride environments.
- SUS310TB: Suitable for even higher temperature applications.
- SUS321TB: Stabilized grade with titanium for improved resistance to intergranular corrosion.
