321 Stainless Steel Plate
Stellanox Steel offers premium 321 Stainless Steel Plates, engineered for superior performance in high-temperature environments. As a titanium-stabilized austenitic stainless steel, 321 plate is ideal for applications that require resistance to intergranular corrosion after welding and extended exposure to elevated temperatures.
It combines the corrosion resistance of 304 stainless steel with added strength and thermal stability, making it a preferred material in aerospace, thermal processing, and chemical industries.
What is 321 Stainless Steel Plate?
321 Stainless Steel Plate is an austenitic chromium-nickel stainless steel alloy containing titanium, which forms stable carbides and prevents chromium depletion at grain boundaries during welding. This stabilization allows 321 to maintain its resistance to intergranular corrosion, even in high-heat conditions.
Compared to 304 or 304L, 321 offers better creep strength and resistance to stress rupture, making it the go-to option for heat exchangers, furnace parts, and pressure vessels operating above 425°C.
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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 Plate
- Titanium-Stabilized: Prevents carbide precipitation during welding or heating.
- Excellent High-Temperature Resistance: Can withstand temperatures up to 870°C.
- Good Mechanical Strength: Better creep and stress rupture properties than 304.
- Improved Weldability: Ideal for pressure vessel or structural welds.
- Corrosion Resistance: Performs well in oxidizing environments and mild chemicals.
- Non-Magnetic: In the annealed condition, ideal for applications requiring non-magnetic alloys.
Specification Chart – 321 Stainless Steel Plate
| Property | Details |
|---|---|
| Standard | ASTM A240 / ASME SA240 |
| Grade | 321 (UNS S32100) |
| Thickness Range | 3.0 mm to 100 mm |
| Width | Up to 2000 mm |
| Length | 2000 mm to 6000 mm (or custom) |
| Finish Types | No.1, 2B, No.4, Matte, Brushed, Polished |
| Edge Condition | Sheared / Slit / Mill Edge |
| Surface Protection | Paper / PVC / Interleaf |
Chemical Composition – 321 Stainless Steel Plate
| Element | Symbol | Composition (%) |
|---|---|---|
| Chromium | Cr | 17.0 – 19.0 |
| Nickel | Ni | 9.0 – 12.0 |
| Carbon | C | ≤ 0.08 |
| Manganese | Mn | ≤ 2.0 |
| Silicon | Si | ≤ 0.75 |
| Phosphorus | P | ≤ 0.045 |
| Sulfur | S | ≤ 0.030 |
| Titanium | Ti | ≥ 5x(C + N) to 0.70 |
| Iron | Fe | Balance |
Mechanical Properties – 321 Stainless Steel Plate
| Property | Value |
|---|---|
| Tensile Strength (MPa) | ≥ 515 |
| Yield Strength (MPa) | ≥ 205 |
| Elongation (%) | ≥ 40 |
| Hardness (HRB) | ≤ 95 |
| Modulus of Elasticity | 193 GPa |
| Density | 7.90 g/cm³ |
Equivalent Grades
| Standard | Grade |
|---|---|
| ASTM | 321 |
| EN | 1.4541 |
| JIS | SUS 321 |
| UNS | S32100 |
| DIN | X6CrNiTi18-10 |
321 Stainless Steel Plate Weight Chart
| Thickness (mm) | Weight per m² (kg) | Weight per 4’ x 8’ Plate (kg) |
|---|---|---|
| 3.0 | 23.70 | 57.94 |
| 5.0 | 39.50 | 96.54 |
| 6.0 | 47.40 | 115.85 |
| 8.0 | 63.20 | 154.44 |
| 10.0 | 79.00 | 193.03 |
| 12.0 | 94.80 | 231.62 |
| 16.0 | 126.40 | 308.80 |
| 20.0 | 158.00 | 386.00 |
| 25.0 | 197.50 | 482.50 |
Applications of 321 Stainless Steel Plate
- Heat exchangers, furnaces, and superheater tubes
- High-temperature chemical processing
- Exhaust manifolds and aircraft engine parts
- Expansion joints and bellows
- Refineries and pressure vessels
- Thermal oxidizers and ducting
- Boiler shells and weldments
Benefits of 321 Stainless Steel Plate
- Better weld heat resistance than 304/304L
- Excellent resistance to intergranular corrosion
- Maintains structural integrity at elevated temperatures
- Easy to fabricate and weld
- Reliable in cyclical thermal stress environments
- Suitable for long-term oxidation exposure
2025 Stellanox Steel |