321 Stainless Steel Bar
Stellanox Steel supplies high-performance 321 Stainless Steel Bars, ideal for high-temperature and welded applications where excellent resistance to intergranular corrosion is essential. Stabilized with titanium, 321 bars provide superior performance in thermal cycling and elevated temperature environments, making them suitable for exhaust systems, heat exchangers, and pressure vessels.
These bars are available in various shapes including round, square, hex, and flat, and are widely used in the aerospace, chemical, and thermal processing industries.
What is 321 Stainless Steel Bar?
321 Stainless Steel Bar is an austenitic chromium-nickel stainless steel alloy stabilized with titanium. The titanium content prevents the formation of chromium carbides during welding, protecting the material from intergranular corrosion. This makes 321 stainless ideal for applications involving repeated heating between 427–870°C.
321 bars are typically supplied in annealed condition and offer good weldability, formability, and creep strength under prolonged thermal exposure.
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Stainless Steel |
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Carbon Steel |
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Duplex Stainless Steel |
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Super Duplex Stainless Steel |
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Alloy Steel |
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Titanium |
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Hastelloy |
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Inconel |
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Monel |
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Aluminium |
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Copper |
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Pure Nickel |
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Flanges |
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Forged Fittings |
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Valves |
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Fasteners |
Key Features of 321 Stainless Steel Bar
- Titanium Stabilized: Resists intergranular corrosion in welded zones.
- High-Temperature Strength: Maintains performance up to 900°C.
- Excellent Oxidation Resistance: Withstands scaling and thermal cycling.
- Weldable Without Sensitization: Eliminates the need for post-weld annealing.
- Non-Magnetic (Annealed): Suitable for sensitive equipment and systems.
- Reliable in Thermal Stress: Ideal for heat exchangers and exhaust systems.
Specification Chart – 321 Stainless Steel Bar
| Property | Details |
|---|---|
| Grade | 321 (UNS S32100) |
| Standards | ASTM A276, ASTM A479, EN 10088-3 |
| Sizes Available | 3 mm to 300 mm (Round/Square/Hex/Flat) |
| Length | Up to 6 meters or custom cut |
| Finishes | Bright, Black, Peeled, Polished |
| Shapes | Round, Square, Hex, Flat |
Chemical Composition – 321 Stainless Steel Bar
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5xC – ≤ 0.70 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Mechanical Properties – 321 Stainless Steel Bar
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 515 |
| Yield Strength (MPa) | ≥ 205 |
| Elongation (%) | ≥ 40 |
| Hardness (HRB) | ≤ 95 (Annealed) |
| Density | 7.92 g/cm³ |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | 321 |
| EN | 1.4541 |
| JIS | SUS 321 |
| UNS | S32100 |
| DIN | X6CrNiTi18-10 |
Applications of 321 Stainless Steel Bar
- Aircraft Exhaust Manifolds
- Expansion Joints and Bellows
- Heat Exchangers and Radiator Tubes
- Thermal Insulation Supports
- Petrochemical and Refining Systems
- Pressure Vessels and Furnace Fixtures
Benefits of 321 Stainless Steel Bar
- High stability in high-temperature environments
- Prevents weld decay with titanium stabilization
- Excellent resistance to oxidation and scaling
- Ideal for cyclic thermal stress and fatigue
- Easily machined, formed, and welded
- Durable in structural and high-heat industrial use
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