321 Stainless Steel Pipes and Pipe Fittings
347 Stainless Steel Pipes and Pipe Fittings
321 SS Pipes and Pipe Fittings 347 Stainless Steel Pipes and Pipe Fittings
62 Reviews
Product Description:
321 and 347 stainless steel pipes and pipe fittings are stabilized austenitic stainless steel grades that provide exceptional resistance to intergranular corrosion, even in high-temperature applications. These grades are widely used in demanding industries such as chemical processing, aerospace, and thermal equipment due to their durability, strength, and enhanced corrosion resistance.
321 Stainless Steel Pipes and Pipe Fittings
Grade 321 stainless steel is stabilized with titanium, which helps prevent carbide precipitation during welding and enhances resistance to intergranular corrosion.
Key Features
- Excellent Corrosion Resistance: Particularly against oxidation and intergranular corrosion.
- High-Temperature Strength: Performs well in continuous service up to 900°C.
- Improved Weldability: Titanium stabilization minimizes sensitization during welding.
- Good Mechanical Properties: Suitable for forming and machining.
Applications
- Exhaust systems in aircraft and automotive industries
- Heat exchangers and pressure vessels
- High-temperature chemical processing equipment
- Thermal oxidizers and industrial boilers
347 Stainless Steel Pipes and Pipe Fittings
Grade 347 stainless steel is stabilized with niobium (columbium), offering superior resistance to intergranular corrosion and enhanced high-temperature performance.
Key Features
- Enhanced High-Temperature Resistance: Suitable for long-term use in temperatures up to 870°C.
- Superior Weldability: Niobium stabilization reduces carbide precipitation during welding.
- Corrosion Resistance: Comparable to 321, with added resistance to strong oxidizing agents.
- Versatility: Ideal for environments requiring resistance to aggressive chemicals.
Applications
- Chemical reactors and heat exchangers
- High-pressure and high-temperature piping systems
- Aerospace and marine equipment
- Food processing and pharmaceutical machinery
Available Types
- Seamless Pipes
- Welded Pipes
- Buttweld Fittings: Elbows, Tees, Reducers, Crosses
- Threaded Fittings
- Stub Ends and Caps
- Flanges
Value-Added Services
- Custom Fabrication: Pipes and fittings tailored to specific dimensions.
- Surface Treatments: Polishing, pickling, and coating for enhanced performance.
- Inspection and Testing: Certificates and reports provided for complete quality assurance.
Contact Us for Premium Stainless Steel Solutions
For high-quality 321 and 347 stainless steel pipes and pipe fittings, contact us today. We provide expert guidance, competitive pricing, and tailored solutions for your industrial and commercial needs.
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 |
| Titanium (Ti) | ≥ 5x(C+N) | — |
| Niobium (Nb) | — | 10x(C+N) to 1.0 |
| 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) |
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) |
Application Industry
Serving Diverse Sectors with Precision & Performance
Om Steel supplies premium steel and alloy products to a wide range of industries, ensuring strength, durability, and performance in every application. From construction, oil & gas, and automotive to power plants, shipbuilding, and chemical processing — our materials meet the demands of critical operations. Trusted by industry leaders, we deliver solutions that stand up to the toughest challenges.
Defence & Aerospace
Oil/Gas
Speciality Valves & Vacuum
Precision Components
Defence & Aerospace
Oil/Gas
Speciality Valves & Vacuum
Precision Components
Explore Our
Products
Ask Anything
Do you have any questions?
What is the main difference between 321 and 347 stainless steel?
Can these grades withstand high temperatures?
What industries benefit most from using 321 and 347 stainless steel?
