321 Stainless Steel Tubes 347 Stainless Steel Tubes
63 Reviews
Product Description:
321 and 347 stainless steel tubes are high-performance austenitic stainless steels that offer excellent corrosion resistance, high-temperature strength, and durability. Both grades are stabilized with different elements, making them ideal for applications requiring resistance to intergranular corrosion after welding or exposure to high temperatures.
321 Stainless Steel Tubes
Grade 321 is an austenitic stainless steel stabilized with titanium, which prevents carbide precipitation during welding or high-temperature exposure. It is widely used in industries requiring enhanced resistance to oxidation and heat.
Key Features
- Stabilized with Titanium: Prevents carbide precipitation and enhances corrosion resistance in high-temperature environments.
- High Oxidation Resistance: Performs well in continuous service up to 870°C.
- Good Formability: Easy to fabricate and weld.
- Resistance to Intergranular Corrosion: Excellent for applications where welding is required.
Applications
- Aircraft exhaust systems
- Thermal oxidizers
- High-temperature chemical processing equipment
- Expansion joints and bellows
- Furnace components
347 Stainless Steel Tubes
Grade 347 is stabilized with niobium (columbium) and tantalum, providing superior resistance to intergranular corrosion, especially in applications involving high temperatures and welding.
Key Features
- Stabilized with Niobium and Tantalum: Offers resistance to intergranular corrosion and sensitization.
- High-Temperature Strength: Suitable for continuous service up to 870°C and intermittent service up to 925°C.
- Enhanced Toughness: Maintains strength and durability at low and elevated temperatures.
- Ease of Fabrication: Weldable and machinable with standard techniques.
Applications
- Aerospace applications
- High-temperature chemical processing equipment
- Heat exchangers
- Power generation plants
- Oil and gas industry piping systems
Chemical Composition
| Element | 321 (%) | 347 (%) |
|---|---|---|
| Carbon (C) | 0.08 (maximum) | 0.08 (maximum) |
| Chromium (Cr) | 17.0-19.0 | 17.0-19.0 |
| Nickel (Ni) | 9.0-12.0 | 9.0-13.0 |
| Manganese (Mn) | 2.0 (maximum) | 2.0 (maximum) |
| Silicon (Si) | 1.0 (maximum) | 1.0 (maximum) |
| Sulfur (S) | 0.03 (maximum) | 0.03 (maximum) |
| Phosphorus (P) | 0.045 (maximum) | 0.045 (maximum) |
| Stabilizer | Titanium (Ti): 5xC | Niobium (Nb): 10xC |
Mechanical Properties
| Property | 321 | 347 |
|---|---|---|
| Tensile Strength (MPa) | 515 (minimum) | 515 (minimum) |
| Yield Strength (MPa) | 205 (minimum) | 205 (minimum) |
| Elongation (%) | 40 | 40 |
| Hardness (HRB) | 95 (maximum) | 95 (maximum) |
Available Types of Tubes
- Seamless Tubes: Ideal for high-pressure, high-temperature applications.
- Welded Tubes: Economical solutions for general-purpose applications.
- Round Tubes: Commonly used in structural and industrial applications.
- Square and Rectangular Tubes: Preferred for architectural and construction uses.
Value-Added Services
- Custom Fabrication: Tailored solutions for unique dimensions and requirements.
- Surface Treatments: Polished, pickled, or coated finishes for enhanced performance.
- Inspection and Certification: Full compliance with ASTM, ASME, and other international standards.
Contact Us for Premium Stainless Steel Tubes
Looking for high-quality 321 and 347 stainless steel tubes? Contact us today for expert guidance, competitive pricing, and tailored solutions to meet your specific project needs.
